Accueil
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH . Vol. 15, N° 5Mention de date : 09/2018Paru le : 09/10/2018 |
Dépouillements
Ajouter le résultat dans votre panierSlot die stripe coating of low viscous fluids / Sebastian M. Raupp in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Slot die stripe coating of low viscous fluids Type de document : texte imprimé Auteurs : Sebastian M. Raupp, Auteur ; Marcel Schmitt, Auteur ; Anna-Lena Walz ; Ralf Diehm ; Helga Hummel ; Philip Scharfer ; Wilhelm Schabel Année de publication : 2018 Article en page(s) : p. 899-911 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Tags : 'Enduit de filière' 'Revêtement à rayures' 'Fenêtre processus' 'Epaisseur minimale du film' 'Limite supérieure' 'Liquides peu visqueux' 'Modèle pour l'épandage Index. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is applied to deposit thin and homogenous films in roll-to-roll and sheet-to-sheet applications. The critical step in operation is to choose suitable process parameters within the process window. In this work, we investigate an upper limit for stripe coatings. This maximum film thickness is characterized by stripe merging which needs to be avoided in a stable process. It is shown that the upper limit reduces the process window for stripe coatings to a major extent. As a result, stripe coatings at large coating gaps and low viscosities are only possible for relatively thick films. Explaining the upper limit, a theory of balancing the side pressure in the gap region in the cross-web direction has been developed. Note de contenu : - Determination of process window
- Finally, the following observations for strippe coatings can be stated
- A first theoretical approach to explain the experimental findings and an upper limit for stripe coatings
- Upper limit and maximum hwet film thickness calculationsDOI : 10.1007/s11998-017-0039-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0039-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31115
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 899-911[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible A macroscopically nondestructive method for characterizing surface mechanical properties of polymeric coatings under accelerated weathering / Ching-Hsuan Chang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : A macroscopically nondestructive method for characterizing surface mechanical properties of polymeric coatings under accelerated weathering Type de document : texte imprimé Auteurs : Ching-Hsuan Chang, Auteur ; Chun-Chieh Tien, Auteur ; Hsiang-Chun Hsueh ; Lipiin Sung Année de publication : 2018 Article en page(s) : p. 913-922 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contrôle non destructif
Essais dynamiques
Indentation des matériaux
Mesure
Microscopie confocale à balayage laser
Morphologie (matériaux)
Nanoindentation
Polyuréthanes
Rayures
Résistance à l'abrasion
Résistance au rayonnement ultraviolet
Revêtements -- Propriétés mécaniques
Surfaces (technologie)
Surfaces -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : The surface of coatings and plastics is the first target in any degradation process initiated by ultraviolet (UV) radiation or mechanical stress (via scratch and abrasion). Surface damage can lead to changes in optical, morphological, and mechanical properties and can result in pathways for ingress of moisture and corrosive agents. Current test methods for monitoring performance of protective coatings focus on chemical properties and optical properties, such as color and gloss measurements, or invasive tests such as abrasion and cross-cut adhesion. In this study, a macroscopically nondestructive performance protocol using nanoindentation metrology via a well-controlled scratch test was applied to evaluate the scratch resistance and monitor the surface mechanical property changes in a protective coating under accelerated weathering. Polyurethane (PU) coatings with different polyol compositions were chosen for this study. Coating specimens were exposed to high-intensity UV radiation at 55°C and 75% RH conditions. Exposed specimens were removed at specified UV exposure times for surface modulus/hardness and scratch resistance characterization via nanoindentation and scratch test. The effect of polyol type and UV radiation dose on the scratch damage (scratch morphology) was investigated and correlated with the surface hardness and modulus of the materials. Note de contenu : - EXPERIMENTAL : Materials - UV exposure measurements - Polymer interface consortium scratch test protocol (PICSTP) - Suface mechanical measurements and scratch testing - Scratch morphology characterization
- RESULTS AND DISCUSSION : Effect of polyol type - Effect of UV radiationDOI : 10.1007/s11998-017-0042-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0042-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31116
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 913-922[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Considering the effect of graphene loading in water-based epoxy coatings / T. Monetta in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Considering the effect of graphene loading in water-based epoxy coatings Type de document : texte imprimé Auteurs : T. Monetta, Auteur ; A. Acquesta, Auteur ; A. Carangelo ; F. Bellucci Année de publication : 2018 Article en page(s) : p. 923-931 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages
Analyse électrochimique
Anticorrosifs
Anticorrosion
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Métaux -- Revêtements protecteurs
Nanoparticules
Polymères en émulsion
Revêtements en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : Recently, graphene has gained increasing interest in numerous fields of application and, in particular, it has been used as a nanofiller in the preparation of polymeric composites to improve their mechanical and transport properties. However, the effect of graphene as a potential additive for anticorrosive organic coatings is not widely studied. In this work, low levels of graphene nanosheets, 0.5 and 1 wt%, were added to an additive-free waterborne epoxy resin applied to Al2024-T3 aluminum alloy samples. The presence of graphene did not affect the polymerization process of the resin and the adhesion at coating/substrate interface, as demonstrated by experimental results, while showing a slight effect on coatings wettability. Electrochemical analysis revealed an improvement of the protective properties of the coating that could be assigned to a slow absorption rate of the electrolytes in the polymeric matrix and a lesser amount of absorbed water than the unloaded film. DOI : 10.1007/s11998-017-0045-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0045-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31117
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 923-931[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I / Kurt Wood in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I Type de document : texte imprimé Auteurs : Kurt Wood, Auteur Année de publication : 2018 Article en page(s) : p. 933-943 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Dioxyde de titane
Durée de vie (Ingénierie)
Essais (technologie)
Essais accélérés (technologie)
Evaluation
Lampe au xénon
Polyfluorure de vinylidène
Prévision, Théorie de la
Résistance aux conditions climatiques
Revêtements -- Effets du climat:Peinture -- Effets du climat
Revêtements -- Normes:Peinture -- Normes
Revêtements en bâtiment:Peinture en bâtimentIndex. décimale : 667.9 Revêtements et enduits Résumé : A recently developed xenon arc-based accelerated weathering cycle, ASTM D7869-13, has been validated for automotive and aerospace coatings, but its ability to predict the gloss and color retention of premium architectural finishes has not yet been evaluated. We review new weathering data comparing the performance of poly(vinylidene fluoride) (PVDF) architectural finishes in south Florida exposure as well as several accelerated exposure methods including ASTM D7869-13. ASTM D7869 accurately reproduced Florida rank order gloss and color retention trends for coatings made with PVDF-acrylic blends and inorganic pigments, as well as the gloss and color changes seen in Florida for 70% PVDF masstone coatings made with a number of single organic pigments. However, the D7869 cycle has difficulty predicting the rank order of rutile TiO2 grades for the gloss retention of PVDF coatings in Florida, as well as the magnitude and direction of color fade from organic pigment degradation in organic pigment/inorganic pigment blends. One open question that remains is whether the ASTM D7869 cycle might have some utility for industry standard or specification purposes, if the test is limited to specific reference colors or more ideally to specific reference pigments. Note de contenu : - Experimental
- Evaluation of ASTM D7869-13 for PVDF coatings with weatherable inorganic pigments
- Evaluation of ASTM D7869-13 for PVDF coatings with TiO2
- Evaluation of ASTM D7869-13 for PVDF coatings with organic pigmentsDOI : 10.1007/s11998-017-0050-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0050-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31118
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 933-943[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Corrosion behavior of AISI 316 stainless steel coated with modified fluoropolymer in marine condition / E. Husain in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Corrosion behavior of AISI 316 stainless steel coated with modified fluoropolymer in marine condition Type de document : texte imprimé Auteurs : E. Husain, Auteur ; A. Abdel Nazeer, Auteur ; J. Alsarraf ; K. Al-Awadi ; M. Murad ; A. Al-Naqi ; A. Shekeban Année de publication : 2018 Article en page(s) : p. 945-955 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable
Anticorrosifs
Anticorrosion
Atmosphère marine
Caractérisation
Essais d'adhésion
Métaux -- Revêtements protecteurs
Morphologie (matériaux)
Mouillabilité
Nanoindentation
Polyfluorure de vinylidène
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Spectroscopie d'impédance électrochimique
Spectroscopie RamanIndex. décimale : 667.9 Revêtements et enduits Résumé : In the maritime industry, stainless steel corrosion resistance requires further surface improvement and further enhanced protection using surface coatings. In this study, an engineered copolymer of polyvinylidene fluoride (PVDF) with polymethylmethacrylate (PMMA)-blended coating was found to provide outstanding corrosion resistance for metal surfaces affording protection against severely corrosive marine environments. Electrochemical measurements indicate that corrosion protection of 316 stainless steel was drastically increased when utilizing the KP blend (a combination of PVDF + PMMA), producing a new set of corrosion properties and morphological characteristics. The corrosion protection of the KP coating proved to be very effective in reducing the passive region current density from 2.19 × 10−5 A/cm2 (for bare stainless steel) to 2.63 × 10−10 A/cm2 and the breakdown passive region potential at 0.25 V. This was followed by a significant decrease in corrosion rate, when compared to pure PMMA and PVDF films, during exposure to artificial marine seawater. With the KP film, impedance measurements surpassed those of other films, with a noticeable nonpeak straight line in the phase angle diagram. Optical observation showed that corrosion pits and delamination areas existed under the coatings. Note de contenu : - EXPERIMENTAL PROCEDURE : Material - Synthesization of coating fils - Surface characterization - Electrochemical measurements - Raman spectra - Nanoindentation measurements
- RESULTS AND DISCUSSION : Wettability of the stainless steel alloy-coated surfaces - Adhesion test - Raman spectroscopy - Potentiodynamic polarization - Electrochemical impedance spectroscopy - Surface morphology - Nanoindentation analysisDOI : 10.1007/s11998-017-0025-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0025-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31119
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 945-955[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Color prediction of metallic coatings from measurements at common geometries in portable multiangle spectrophotometers / Feng Heng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Color prediction of metallic coatings from measurements at common geometries in portable multiangle spectrophotometers Type de document : texte imprimé Auteurs : Feng Heng, Auteur ; Haisong Xu, Auteur ; Fuzheng Zhang ; Zhehong Wang Année de publication : 2018 Article en page(s) : p. 957-966 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais (technologie)
Prévision, Théorie de la
Revêtement métallique
Spectrophotomètres
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : Illuminating and viewing geometries may strongly affect the color appearance of metallic coatings, which can be characterized accurately by bidirectional reflectance distribution function (BRDF) measurement devices. However, such devices with hundreds or even thousands of different geometries are usually expensive and complex. Accordingly, two modified models were developed in this study, based on the distribution of aluminum-flake pigments in the coatings, to, respectively, estimate the spectral radiance factors and the CIE tristimulus values of metallic coatings utilizing the measurements at 6 common geometries of portable multiangle spectrophotometers. Their performance was examined with 65 achromatic and 20 chromatic metallic coating samples under D65, A, and F11 illuminants. The average CIEDE2000 color differences over all 19 geometries were found to be less than 1.8 for both models, while the average CAM02-SCD and CIELAB color differences can, respectively, reach 1.7 and 2.0, indicating the effectiveness of our methods. Note de contenu : - SAMPLE PREPARATION AND MEASUREMENT GEOMETRIES : Sample preparation - Measurement geometries of X-Rite MA98
- COLOR PREDICTION : Modelig spectral radiance factor - Modeling tristimulus values
- MODEL TESTINGDOI : 10.1007/s11998-017-0026-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0026-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31120
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 957-966[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of polyesteramides : poly(ethylene adipate amide) and poly(ethylene succinate amide) and their application as corrosion inhibitors in paint formulations / Mohamed Heba A. in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Synthesis of polyesteramides : poly(ethylene adipate amide) and poly(ethylene succinate amide) and their application as corrosion inhibitors in paint formulations Type de document : texte imprimé Auteurs : Mohamed Heba A., Auteur ; Yasser Assem, Auteur ; Rana Said ; Ahmed M. El-Masry Année de publication : 2018 Article en page(s) : p. 967-981 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Formulation (Génie chimique)
Polycondensation
Polyesteramides
Polymères -- Synthèse
Polymères aliphatiques
Revêtements protecteurs
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Aliphatic polyesters based on adipic or succinic acid were synthesized by polycondensation reaction to produce poly(ethylene adipate) (PEA) and poly(ethylene succinate) (PES), respectively. The prepared polyesters (PEA and PES) were modified with monoethanol amine to produce polyesteramides, namely polyethylene adipate amide (PEAA) and polyethylene succinate amide (PESA). Full characterization of PEA, PES, PEAA and PESA was achieved using thermal, spectroscopic, and gel permeation chromatography analyses. The prepared aliphatic polyesters (PEA and PES) and polyesteramides (PEAA and PESA) were evaluated as corrosion inhibitors in paint formulations. Two groups of paints were prepared with 24 paint formulations based on medium oil alkyd resin, talc, titanium dioxide, drier and the prepared polymers with different types and concentrations. All the formulations are free from any inorganic anticorrosive pigments. PEA and PEAA were incorporated in Group I formulations. Paint formulations that contain PEA are six formulations F1A, F2A, F3A, F4A, F5A and F6A in addition to F1Aa, F2Aa, F3Aa, F4Aa, F5Aa and F6Aa based on PEAA with different concentrations 0.5%, 1.5%, 2.5%, 3.5%,4.5% and 5.5%, respectively. Group II formulations contain twelve other prepared formulations F1S, F2S, F3S, F4S, F5S and F6S based on PES, in addition to F1Sa, F2Sa, F3Sa, F4Sa, F5Sa and F6Sa based on PESA with the same series of concentrations. Physical, mechanical, and chemical properties of the coated films were determined. Corrosion tests in addition to surface analysis by a scanning electron microscope were performed to study the protection efficiency of such coats on steel. It was found that the synthesized polyesteramides can protect steel from corrosion successfully in 3.5% NaCl solution depending on their adsorption on the steel surface. The extent of steel protection coated with PESA formulations was slightly higher than PEAA. Note de contenu : - EXPERIMENTAL : Materials - General procedure for the synthesis of polyesters from dicarboxylic acids and diols - Synthesis of polyesteramides PEAA and PESA - Coating formulations - Characterization techniques
- RESULTS AND DISCUSSION : Synthesis of PEA, PEAA, PES and PESA - Characterization of PEA, PEAA, PES and PESADOI : 10.1007/s11998-017-0027-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0027-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31121
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 967-981[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Effect of blade-tip shape on the doctoring step in gravure printing processes / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Effect of blade-tip shape on the doctoring step in gravure printing processes Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Daniel S. Hariprasad, Auteur ; Peter Randall Schunk Année de publication : 2018 Article en page(s) : p. 983-992 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastohydrodynamique
Electronique imprimée
Héliogravure
Impression hélio
Interaction fluide-structure
Lubrification
RacleIndex. décimale : 667.9 Revêtements et enduits Résumé : A fundamental limit to the gravure printing process is in the doctoring step, in which a residual film defines the lower bound on allowable feature size. The resolution of finer features requires thin residual films, but these thin films increase the likelihood of wearing the doctor blades. A computational model was used to study the effect of blade-tip shape on residual film thickness while also minimizing the likelihood of wear. The blade-tip shape is altered by varying the bevel angles and the predicted film thickness is computed under various wiping speeds, configurations, and applied forces. In all cases studied, a slower wiping speed resulted in a thinner residual film, which is due to the doctoring step being governed by elastohydrodynamic lubrication. In some cases, a reversal of the wiping configuration created a thinner film, but it had no impact on the likelihood of wearing. Higher applied force leads to thinner residual film but the blade shape can have a more significant influence, indicating that lubrication forces dominate at this scale. Lastly, the likelihood of blade wear was predicted to vary within a small range for a fixed blade-tip shape over all conditions studied, which suggests that tip shape is the primary factor to consider when minimizing blade wear. DOI : 10.1007/s11998-017-0029-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0029-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31122
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 983-992[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Structure and surface properties of a novel bulk-matte waterborne polyurethane coating composite / Qiwen Yong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Structure and surface properties of a novel bulk-matte waterborne polyurethane coating composite Type de document : texte imprimé Auteurs : Qiwen Yong, Auteur ; Bing Liao, Auteur ; Guo Ying ; Liang Caizhen ; Hao Huang ; Hao Pang Année de publication : 2018 Article en page(s) : p. 993-1002 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Epoxydes
MatitéÉtat de ce qui est mat : La matité d'un son, d'une couleur. (Larousse)
Polymères réticulés
Polyuréthanes
Réaction de couplage
Revêtements en phase aqueuse
SilanesIndex. décimale : 667.9 Revêtements et enduits Résumé : This paper reports on a novel self-matte or bulk-matte waterborne polyurethane coating composite with inherently extremely low gloss. The coating composite was comprised of a siloxane-containing waterborne polyurethane (SPU) resin and a crosslinked waterborne polyurethane (CPU) resin. The CPU resin was mainly responsible for fabricating the micro-rough surface of the film, which was achieved by a crosslinking reaction between the waterborne polyurethane and bisphenol A-type epoxy E-44 resin. The SPU resin was used to improve the comprehensive properties of the film, which was ascribed to the addition of silane coupling agent KH792. Compared with traditional matte coatings, this coating composite made it possible to avoid high loadings of matting agent and to arrive at highly flexible low-gloss finishes. Gloss levels of as low as a few tenths of a percent, even at high incidence angles, have been achieved with zero loading of extraneous dulling agent. The chemical structures of the SPU and CPU resins were characterized by FTIR-ATR and NMR spectra. The micro-rough topographies and surface rough degrees of the SPU, CPU and their 50%/50% composite films were measured by SEM and MSP, respectively. The particle sizes and particle morphologies of the SPU and CPU resins were imaged by TEM. Finally, the comprehensive properties of the SPU, CPU and their 50%/50% composite resins were evaluated, including the water contact angle, film transparency, tensile strength and storage stability. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the siloxane-containing waterborne polyurethane (SPU) resin - Synthesis of the crosslinked waterborne polurethane (CPU) resin - Preparation of the individual SPU, CPU and composite films - Characterization
- RESULTS : Chemical structural characterization - Particle morphology observation - Film surface analysis - Films transparency - Film tensile property - Water contact angle - Physical propertiesDOI : 10.1007/s11998-017-0030-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0030-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31123
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 993-1002[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Effect of orange peel attribute of automotive finishes on their blackness perception / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Effect of orange peel attribute of automotive finishes on their blackness perception Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Farhad Ameri, Auteur Année de publication : 2018 Article en page(s) : p. 1003-1011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aspect peau d'orange (peinture)
Automobiles -- Revêtements:Automobiles -- Peinture
Evaluation visuelle
Noir (couleur)
Revêtements -- Finition:Peinture -- Finition
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this paper, the perceived blackness of 10 specific automotive finishes with different levels of orange peel attribute is investigated under the diffuse illumination condition. Since the purchased ACT black panels had approximately the same colorimetric attributes, i.e., lightness, hue, and chroma, the effect of colorimetric properties on perceived blackness was minimized. Thirty nonexpert observers including 14 males and 16 females were selected to compare the blackness perception of ACT black panels. The observers’ normal color vision was already evaluated by applying the Ishihara test method. The black panels were ranked from the minimum perceived blackness to the maximum by employing the pair comparison method and performing 1800 visual assessments. Results showed that, in general, the blackness perception of panels increased with a decrease in their orange peel attributes, but the orange peel attribute is not the only factor affecting the perceived blackness of black panels. Besides, while the black panels were colorimetrically too close to each other, the panel with the lowest lightness and chroma value was assessed as the blackest sample among the ACT panels with the lowest orange peel attribute. Note de contenu : - Samples selection
- Samples measurement
- Visual assessment experimentsDOI : 10.1007/s11998-017-0046-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0046-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31124
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1003-1011[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Facile fabrication of superhydrophilic and underwater superoleophobic chitosan–polyvinyl alcohol-TiO2 coated copper mesh for efficient oil/water separation / Qiuying You in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Facile fabrication of superhydrophilic and underwater superoleophobic chitosan–polyvinyl alcohol-TiO2 coated copper mesh for efficient oil/water separation Type de document : texte imprimé Auteurs : Qiuying You, Auteur ; Guoxia Ran, Auteur ; Chan Wang ; Yuan Zhao ; Qijun Song Année de publication : 2018 Article en page(s) : p. 1013-1023 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique
Anticorrosion
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
Cuivre
Hydrophilie
Maille métallique
Membranes (technologie)
Mouillabilité
Nanoparticules
Oléophobie
Résistance à l'abrasion
Séparation huile/eauIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic–inorganic hybrid membranes are attractive material for oil/water separation. Here, a hydrophilic and oleophobic membrane was prepared by coating chitosan (CTS) and polyvinyl alcohol (PVA) on the surface of copper mesh using glutaraldehyde (GA) as crosslinking agent. After introduction of TiO2 nanoparticles, the surface roughness of the composite film was increased and a superhydrophilicity and underwater superoleophobicity surface was obtained due to the enhancement in wettability. The as-prepared superhydrophilic membrane was characterized by SEM, FTIR, XRD, and its surface wetting behavior was measured by contact angle meter. The effect of CTS, PVA, GA, and TiO2 on the microstructure, underwater oil contact angle, and sliding angle was comprehensively evaluated. Then, the super hydrophilic membrane was used for oil/water separation, a separation efficiency (> 99.7%) was obtained with a flux rate of 16,000 L m−2 h−1. The intrusion pressures for all tested oils that the membrane can support are above 1.0 kPa. Significantly, the super hydrophilic membrane exhibited good antiabrasion and anticorrosive properties. After repeated use for 60 times, the separating performances and average permeate fluxes showed no obvious degradation. Note de contenu : - EXPERIMENTAL SECTION : Chemicals and materials - Fabrication of CTS-PVA-TiO2 coated copper mesh - Instruments and methods - Oil/water separation experiment
- RESULTS AND DISCUSSION : Components and morphology of coated mesh - Surface wettability of coated mesh - Oil/water separation experiments - Stability and anticorrosive property of coated meshDOI : 10.1007/s11998-017-0036-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0036-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31125
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1013-1023[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Extended hydrophobicity and self-cleaning performance of waterborne PDMS/TiO2 nanocomposite coatings under accelerated laboratory and outdoor exposure testing / Fei Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Extended hydrophobicity and self-cleaning performance of waterborne PDMS/TiO2 nanocomposite coatings under accelerated laboratory and outdoor exposure testing Type de document : texte imprimé Auteurs : Fei Xu, Auteur ; Tao Wang, Auteur ; James Bohling ; Alvin M. Maurice ; Hong Yu Chen ; Limin Wu ; Shuxue Zhou Année de publication : 2018 Article en page(s) : p. 1025-1034 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures
Dioxyde de titane
Essais accélérés (technologie)
Hydrophobie
Nanoparticules
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Revêtement auto-nettoyantIndex. décimale : 667.9 Revêtements et enduits Résumé : It has been shown that incorporation of TiO2 nanoparticles into hydrophobic coatings can show self-cleaning performance. Accelerated laboratory testing indicated that the coats retain their hydrophobic nature for an extended time period. In this paper, hydrophobic polydimethylsiloxane (PDMS)/TiO2 nanocomposite coatings with a TiO2 content of 0–40% were fabricated by simple blending of a PDMS dispersion with an aqueous TiO2 nanoparticle dispersion. Their long-term hydrophobicity and self-cleaning performance were investigated both in laboratory and real-world outdoor testing. As expected, TiO2 nanoparticle-based coatings exhibited better self-cleaning relative to the TiO2-free PDMS control coating as measured by methylene blue degradation testing. Excellent long-term hydrophobicity was observed in accelerated weathering testing when they contained the appropriate levels of TiO2 nanoparticles (i.e., 0–30%). However, the same PDMS/TiO2 coatings did not show self-cleaning performance, and instead, exhibited improved dirt pickup resistance, in outdoor exposure testing. Sustained hydrophobicity was observed in outdoor exposure testing for the clear films except when TiO2 levels were at 40%. The hysteresis of water contact angle (HWCA) significantly increased for the PDMS control coating, and water beading was lost as the film surface picked up dirt. In contrast, the TiO2-based coatings with appropriate TiO2 levels maintained a relatively low HWCA after outdoor exposure and no water sheeting on rainy days was observed. This result demonstrates that while photocatalytic TiO2 nanoparticles can maintain coating hydrophobicity upon outdoor exposure, long-term self-cleaning performance in polluted environments has not yet been achieved with this type of coating under real-world conditions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TiO2 nanoparticle dispersion - Preparation of hydrophobic PDMS/TiO2 nanocomposite coatings - Characterization
- RESULTS AND DISCUSSION : Preparation of the hydrophobic PDMS/TiO2 coatings - Performances of TiO2-based hydrophobic coatings in laboratory - Performances of TiO2-based hydrophobic coatings outdoorsDOI : 10.1007/s11998-017-0037-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0037-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31126
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1025-1034[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Corrosion protection performance of nanocomposite coatings under static, UV, and dynamic conditions / Y. A. Basiru in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Corrosion protection performance of nanocomposite coatings under static, UV, and dynamic conditions Type de document : texte imprimé Auteurs : Y. A. Basiru, Auteur ; Sh. Ammar, Auteur ; K. Ramesh ; B. Vengadaesvaran ; S. Ramesh ; A. K. Arof Année de publication : 2018 Article en page(s) : p. 1035-1047 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion
Matériaux hybrides
Photodétérioration
Revêtements -- Effets du rayonnement ultraviolet
Revêtements organiques
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Silicone-modified epoxy polymeric matrix was successfully fabricated and reinforced with 1–2 wt% SiO2, TiO2, and TiSiO4 nanoparticles. Fourier-transform infrared spectroscopy, contact angle measurements, differential scanning calorimetry, and field-emission scanning electron microscopy together with energy-dispersive X-ray spectroscopy were employed to investigate different characteristics of the prepared coatings. To simulate operating conditions, all samples were characterized via electrochemical impedance spectroscopy (EIS) after being subjected to different conditions. Corrosion under static conditions, in which the samples were exposed to a static electrolyte without further change in other parameters, was investigated. Furthermore, to study the effects of ultraviolet (UV) radiation in accelerating the degradation of the coatings, samples were characterized after being subjected to UV while immersed statically in the electrolyte. Additionally, the corrosion protection performance was investigated after subjecting the coated substrates to dynamic conditions involving continuous movement of the sample in the electrolyte, simulating continuous wear of the coated surfaces. Compared with the static condition, the EIS results revealed the vital role of the silicone resin and nanoparticles in improving the stability of the coating film against corrosion degradation in the presence of UV radiation, while poor performance in dynamic condition was recorded for all the coating systems. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Coating preparation
- CHARACTERIZATION : Fourier-transform infrared (FTIR) spectroscopy - Contact angle (CA) measurements - Differential scanning calorimetry (DSC) - Surface morphology analysis - Electrochemical impedance spectroscopy ( EIS)
- RESULTS AND DISCUSSION : Fourier-transform infrared (FTIR) spectroscopy - Contact angle (CA) measurements - Differential scanning calorimetry (DSC) - Surface morphology - Electrochemical impedance spectroscopy (EIS) - Static condition - Ultraviolet (UV) condition - Dynamic testing - Assessment of EIS results in static, UV, and dynamic conditionsDOI : 10.1007/s11998-017-0038-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0038-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31127
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1035-1047[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Influence of vinyl-terminated hyperbranched polyester on performance of films obtained by UV-initiated thiol–ene click reaction of A2 + B3 system / Juan Cheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Influence of vinyl-terminated hyperbranched polyester on performance of films obtained by UV-initiated thiol–ene click reaction of A2 + B3 system Type de document : texte imprimé Auteurs : Juan Cheng, Auteur ; Shiqin Wang, Auteur ; Junheng Zhang ; Menghe Miao ; Daohong Zhang Année de publication : 2018 Article en page(s) : p. 1049-1057 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chimie click
Composés organiques -- Synthèse
Photoréticulation
Polyesters
Polymères -- Synthèse
Polymères ramifiés
Réaction thiol-ène
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : UV curing technology has become an efficient method to fabricate films with desirable properties, although it is susceptible to oxygen inhibition, resulting in low conversion of double bonds and poor mechanical performance. Thiol–ene click reaction can overcome the shortcomings of common UV curing techniques. In this paper, the vinyl-terminated hyperbranched polyester (VTDP) was incorporated into the curing system of di-ene (A2) and trithiol (B3). Trithiols, including 1,3,5-tris(2-hydroxyethyl)isocyanurate tris(3-mercaptopropionate) (THMP) and trimethylolpropane tris(3-mercaptopropionate) (TMMP), were synthesized by an esterification between 3-mercaptopropionic acid and 1,3,5-tris(2-hydroxyethyl) isocyanurate, and tri(hydroxymethyl)propane, respectively. The UV-initiated thiol–ene click reaction between 1,4-butanediol diacrylate (BDDA) and trithiols (TMMP and THMP) was researched by adjusting different VTDP content. FTIR spectral analysis showed that the thiol–ene reactions proceeded smoothly and the conversion degree of acrylic groups was higher than that of thiol groups. The pencil hardness and abrasion resistance of the cured film increased first and then decreased with the increase in VTDP content, but both their flexibility and adhesion had little change. Their glass transition temperatures increased slightly with the increase in VTDP content. THMP has better positive effect than TMMP on the pencil hardness, abrasion resistance and thermal performance of the cured film. Note de contenu : - EXPERIMENTAL : Materials - Characterization - Synthesis of trithiol (B3) - Synthesis of vinyl-terminated hyperbranched polyester - Preparation of UV-cured film
- RESULTS AND DISCUSSION : Study of the photocuring process - Mechanical properties of the films - Thermal propertoes of the filmsDOI : 10.1007/s11998-017-0040-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0040-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31128
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1049-1057[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Cyclodextrin-based hyperbranched polyester: synthesis, characterization, and antimicrobial activity / Swaminathan Prabu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Cyclodextrin-based hyperbranched polyester: synthesis, characterization, and antimicrobial activity Type de document : texte imprimé Auteurs : Swaminathan Prabu, Auteur ; Chickiyan Sivakumar, Auteur Année de publication : 2018 Article en page(s) : p. 1059-1066 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Antimicrobiens
Concentration minimale inhibitrice (antimicrobiens)En microbiologie, la concentration minimale inhibitrice (CMI) est la plus faible concentration d'un produit chimique, généralement un médicament, qui empêche la croissance visible d'une ou de plusieurs bactéries. La CMI dépend du micro-organisme considéré, de l'être humain affecté (in vivo uniquement) et de l'antibiotique lui-même.
La CMI est déterminée en préparant des solutions du produit chimique in vitro à diverses concentrations croissantes, en incubant les solutions avec des groupes séparés de bactéries en culture et en mesurant les résultats en utilisant une méthode de dilution standardisée (agar ou microdilution). Les résultats se classent ensuite comme "sensible", "intermédiaire" ou "résistant" à un antimicrobien particulier en utilisant un point d'arrêt. Les points d'arrêt sont des valeurs convenues, publiées dans les directives d'un organisme de référence, comme le US Clinical and Laboratory Standards Institute (CLSI), la British Society for Antimicrobial Chemotherapy (BSAC) ou le Comité européen sur les tests de sensibilité aux antimicrobiens (EUCAST). On a pu constater des écarts importants au niveau des points d'arrêt de divers pays européens au fil des ans, et entre ceux de l'EUCAST et du CLSI.
Alors que la CMI est la concentration la plus faible d'un agent antibactérien nécessaire pour inhiber la croissance visible, la concentration bactéricide minimale (CBM) est la concentration minimale d'un agent antibactérien qui entraîne la mort bactérienne. Plus la CMI est proche de la CBM, plus le composé est bactéricide.
La première étape de la découverte d'un médicament est souvent le dépistage d'un médicament candidat de banque de données pour les CMI contre les bactéries d'intérêt. En tant que tels, les CMI sont généralement le point de départ pour de plus grandes évaluations précliniques de nouveaux agents antimicrobiens. Le but de la mesure de la concentration minimale inhibitrice est de s'assurer que les antibiotiques sont choisis efficacement pour augmenter le succès du traitement. (Wikipedia)
Polyesters
Polymères -- Propriétés optiques
Polymères -- Synthèse
Polymères ramifiés
VoltampérométrieIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, the synthesis of cyclodextrin-based hyperbranched polyester (CD-based HBPE) was prepared by a simple condensation route via acid chloride approach (Scheme 1). The formation of ester linkages in CD-based HBPE was clearly identified from FTIR and NMR spectroscopy. The resulting structure and the molecular weight of the CD-based HBPE were confirmed with LC–MS analysis. The CD-based HBPE displayed the fluorescence maxima in the 425 nm range with relatively narrow peak widths indicating that they had pure and intense fluorescence. The antimicrobial activity of the CD-based HBPE was evaluated against the Gram-negative organisms like Escherichia coli and Salmonella paratyphi, Gram-positive organisms as Bacillus subtilis and Staphylococcus aureus and fungi such as Aspergillus niger, and Candida albicans. CD-based HBPE showed a great inhibitory effect toward both bacteria and fungi. The microorganism which possess greater antimicrobial activity with standard antibiotics was selected for determining the minimum inhibitory concentration (MIC) value of the CD-based HBPE. Therefore, the MIC value of the CD-based HBPE against B. subtilis was tested and found to be 31.25 μg mL−1. Hence, it is suggested that CD-based HBPE holds good agreement with the antimicrobial assay. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis - Synthesis of acyl chloride terminated HBPE - Synthesis of CD-based HBPE - Spectroscopic and analytical methods - Antimicrobial assay - Determination of minimum inhibitory concentration by broth dilution method
- RESULTS AND DISCUSSION : Synthesis of CD-based HBPE - FTIR and NMR spectra - Optical properties - Emission spectra - cyclic voltammetric studies - Antimicrobial studiesDOI : 10.1007/s11998-017-0041-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0041-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31130
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1059-1066[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows / Won-Gi Ahn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows Type de document : texte imprimé Auteurs : Won-Gi Ahn, Auteur ; Si Hyung Lee, Auteur ; Jaewook Nam ; See Jo Kim ; Kwan-Young Lee ; Hyun Wook Jung Année de publication : 2018 Article en page(s) : p. 1067-1076 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Enduction par filière
Fluides newtoniens
Mouillage (chimie des surfaces)
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids. Note de contenu : - EXPERIMENTAL SETUP : Properties of coating liquids
- NUMERICAL SIMULATIONS FOR COATING BEAD FLOWS
- RESULTS AND DISCUSSION : Operability windows by models and experiments - Observation of upstream meniscus shape - Comparison of coating bead flows from experiments and 2-D simulations - Effect of contact angles at upstream meniscus on coating bead dynamics - Effect of contact angles at upstream meniscus on operability windowDOI : 10.1007/s11998-018-0059-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0059-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31133
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1067-1076[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Fabrication and properties of polysilsesquioxane-based trilayer core–shell structure latex coatings with fluorinated polyacrylate and silica nanocomposite as the shell layer / Jiawei Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Fabrication and properties of polysilsesquioxane-based trilayer core–shell structure latex coatings with fluorinated polyacrylate and silica nanocomposite as the shell layer Type de document : texte imprimé Auteurs : Jiawei Li, Auteur ; Shenjie Zhong, Auteur ; Wiaojie Yan ; Weixiang Li ; Lingmin Yi Année de publication : 2018 Article en page(s) : p. 1077-1088 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Core-Shell
Couches minces
Dioxyde de silicium
Fluoropolymères
Fourier, Spectroscopie infrarouge à transformée de
Granulométrie
Humidité -- Absorption:Eau -- Absorption
Hydrophobie
Latex
Mesure
Microscopie à force atomique
Morphologie (matériaux)
Mouillabilité
Nanoparticules
Polyacrylates
Polymères -- Synthèse
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Polysilsesquioxanes (PSQ)-based core–shell fluorinated polyacrylate/silica hybrid latex coatings were synthesized with PSQ latex particles as the seeds, and methyl methacrylate, butyl acrylate, 3-(trimethoxysilyl) propyl methacrylate (MPS)-modified SiO2 nanoparticles (NPs), 1H,1H,2H,2H-perfluorooctyl methacrylate (PFOMA) as the shell monomers by emulsifier-free miniemulsion polymerization. The results of Fourier transform IR spectroscopy, transmission electron microscopy, and dynamic light scattering suggested the obtained hybrid particles emerged with trilayer core–shell pattern. Contact angle analysis, x-ray photoelectron spectroscopy, and atom force microscopy results indicated that the hybrid film containing SiO2 NPs showed higher hydrophobicity, lower surface free energy and water absorption, in comparison with the control system (without SiO2 NPs). Compared with the control system, the hybrid latex film containing SiO2 NPs in the fluorinated polyacrylate shell layer showed the higher content of fluorine atoms and a rougher morphology on the film surface. Additionally, thermogravimetric analysis demonstrated the enhanced thermostability of PSQ-based nanosilica composite fluorinated polyacrylate latex film. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of core-shell fluorinated polyacrylate/SiO2 NPs hybrid latex - Preparation of the latex film - Application of hybrid latex on fabrics - Measurements
- RESULTS AND DISCUSSION : FTIR analysis - Particle morphologies and particle size of latexes - Surface property of latex films - Water absorption of latex fims - Surface wettability of the modified fabrics - XPS and AFM analysis - Thermal stability of latex filmsDOI : 10.1007/s11998-018-0044-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0044-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31136
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1077-1088[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Pretreatment effect of the pure titanium surface on hybrid coating adhesion based on tetraethoxysilane and methyltriethoxysilane / Rosiana Boniatti Casagrande in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Pretreatment effect of the pure titanium surface on hybrid coating adhesion based on tetraethoxysilane and methyltriethoxysilane Type de document : texte imprimé Auteurs : Rosiana Boniatti Casagrande, Auteur ; Sandra Raquel Kunst, Auteur ; Lilian Vanessa Rossa Beltrami ; Cesar Aguzzoli ; Rosmary Nichele Brandalise ; Célia de Fraga Malfatti Année de publication : 2018 Article en page(s) : p. 1089-1106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Revêtements
Sol-gel, Procédé
Tétraéthoxysilane
Thermogravimétrie
Titane
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : Hybrid coatings based on silicon alkoxide precursors are one of the options for coating metal surface biomaterials such as pure titanium (Ti). However, the nature and the metal surface preparation, before the coating application, are of fundamental importance for perfecting the coating/surface adhesion. In this study, three different pretreatments were used for the Ti surface: Kroll, Piranha and NaOH. After the pretreatment, the coating was applied by the dip-coating process, using the sol–gel method from the silicon alkoxide precursors, tetraethoxysilane and methyltriethoxysilane. The results of thermogravimetric analysis showed that the tested coatings had excellent thermal stability. The pretreatment with NaOH solution increased the surface roughness of the Ti, thus modifying its surface energy and increasing its wettability. Field emission scanning electron microscopy showed a homogeneous coating with good adhesion of the hybrid coating to the Ti surface, and higher layer thickness on the surface treated with NaOH. In addition, its electrochemical performance was better than the surfaces pretreated with acids. Note de contenu : - MATERIALS AND METHODS : Pretreatments - Development and application of coatings - Sol characterization - Pretreated samples and coating characterization
- RESULTS AND DISCUSSION : Sol characterization - Surface pretreatments - Characterization of silicon alkoxide precursor surface coatings applied after pretreatmentDOI : 10.1007/s11998-017-0035-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0035-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31137
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1089-1106[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Improved corrosion resistance based on APTES-grafted reduced sulfonated graphene/waterborne polyurethane coatings / Jian Luo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Improved corrosion resistance based on APTES-grafted reduced sulfonated graphene/waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Jian Luo, Auteur ; Jihu Wang, Auteur ; Shaoguo Wen ; Dayang Yu ; Youtong Wu ; Kai Sun Année de publication : 2018 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aminopropyltriethoxysilane
Anticorrosifs
Anticorrosion
Essais de brouillard salin
Graphène sulfoné
Greffage (chimie)
Polymères en émulsion
PolyuréthanesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, reduced sulfonated graphene (RSG) containing free amine groups was prepared and modified by 3-aminopropyltriethoxysilane (APTES) and reduction by diethanolamine (DEA). In addition, waterborne polyurethane (WPU) composite coatings were prepared by adding RSG as an anticorrosive filler to WPU. From the results of Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM), it can be found that sulfonated graphene was modified with APTES and successfully reduced by DEA. The SEM images illustrated that RSG was uniformly doped in the WPU. With increasing RSG content, the hydrophobicity of the RSG/WPU films increased due to the strong covalent interaction between RSG and WPU. Finally, the corrosion resistance of the coating was characterized by polarization curves and salt spray tests. Note de contenu : - Materials
- Preparation of APTES-grafted SG
- Preparation of APTES-grafted RSG
- Preparation of RSG/WPU coatings
- Preparation of RSG/WPU films
- CharacterizationDOI : 10.1007/s11998-018-0048-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0048-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31138
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018)[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Mathematical and empirical evaluation of accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings / M. Gorji Bandpay in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Mathematical and empirical evaluation of accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings Type de document : texte imprimé Auteurs : M. Gorji Bandpay, Auteur ; Farhad Ameri, Auteur ; K. Ansari ; S. Moradian Année de publication : 2018 Article en page(s) : p. 1107-1115 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur
Kubelka-Munk, Théorie deLa théorie de Kubelka-Munk (du nom de Paul Kubelka et Franz Munk) décrit les propriétés d'absorption de la lumière et de diffusion de la lumière des systèmes pigmentés, tels que les peintures ou les colorants dans les tissus textiles. La théorie peut prédire à partir de mesures d'épaisseurs à deux couches comment la couleur fonctionne à d'autres épaisseurs de couche. Cela permet aux fabricants de peinture d'estimer combien de pigments ils doivent ajouter à une peinture, de sorte que la peinture est opaque à une certaine épaisseur du travail. Avec l'aide de la théorie, l'effet de couleur du mélange de deux colorants peut être prédit si les paramètres des colorants individuels sont déterminés au moyen de mesures spectroscopiques. Les résultats sont meilleurs que l'utilisation naïve du mélange de couleurs soustractif.
Mathématiques
Opacité (optique)
Prévision, Théorie de la
Revêtements:Peinture
Translucidité (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Attempts were made to evaluate mathematically and empirically the accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings in the color using industries. To this end, an innovative inversed mathematical evaluation procedure was concocted which comprised of plotting the absorption and scattering constants of the Kubelka–Munk model or any of its various modified form or replacements theories against the intrinsic optical coefficients of the respective exact radiation transfer theories, namely Chandrasekhar for opaque and van de Hulst for translucent media. The results prove mathematically that the Kubelka–Munk model for opaque media is a sound theory and its various suggested modifications or replacements do not improve the color match prediction of opaque surface coating media. This mathematical conclusion was further confirmed by color match prediction of actual opaque paint samples. On the other hand, the mathematical prediction for translucent media illustrated a completely different picture, depicting nonlinearity between the optical constants and the respective concentrations of colorants. This implies that much further work has to be carried out to derive invertible new equations to enforce linearity to such situations or make use of alternative artificial intelligent procedures which are designed especially for nonlinearity. Note de contenu : - INTRODUCTION : Theoretical backgroung
- MATHEMATICAL EVALUATION : Mathematical evaluation of the Kubelka-Munk model for opaque media - Mathematical evaluation of the Kubelka-Munk model for translucent media
- EMPIRICAL MODIFICATION
- MATERIALS AND METHODS
- EXPERIMENTAL RESULTS AND DISCUSSIONDOI : 10.1007/s11998-018-0056-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0056-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31139
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1107-1115[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Sonochemically sol–gel derived coating of textiles using heterojunction SnO2/ZnO/chitosan bionanocomposites: in vitro antibacterial evaluation / Parisa Kamali in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Sonochemically sol–gel derived coating of textiles using heterojunction SnO2/ZnO/chitosan bionanocomposites: in vitro antibacterial evaluation Type de document : texte imprimé Auteurs : Parisa Kamali, Auteur ; Nasrin Talebian, Auteur Année de publication : 2018 Article en page(s) : p. 1133-1144 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Caractérisation
Citrique, AcideL'acide citrique est un acide alpha hydroxylé de formule C6H8O7.
Il joue un rôle central dans le métabolisme de tous les organismes vivants et tient son nom de son origine; le citron.
L'acide citrique est biodégradable et n'est pas toxique pour l'homme ni pour l'environnement. Cependant, comme tout acide, il est irritant et peut provoquer des brûlures s'il entre en contact prolongé avec des muqueuses.
À pH physiologique, il est présent sous forme de sa base conjuguée, le citrate, qui est un chélateur de l'ion calcium dans le sang.
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Dioxyde d'étain
Maladies bactériennes
Microbiologie
Oxyde de zinc
Résistance au lavage
Revêtements
Sol-gel, Procédé
Sonochimie
Textiles et tissusIndex. décimale : 667.9 Revêtements et enduits Résumé : The cellulose-based textiles currently used in hospitals are good conducive materials for cross-infection or transmission of diseases caused by microorganisms. Thus, great interest has been recently found in the antibacterial finishing of fabrics for practical applications to prevent the infection incidence. In this work, we developed novel SnO2/ZnO/chitosan bionanocomposites by one-step simultaneous sonochemical/sol–gel deposition to prepare an antibacterial textile as a model for combating bacterial infections. The different prepared samples were characterized using transmission electron microscope, X-ray diffraction, and scanning electron microscopy (SEM) indicating the embedded SnO2 and ZnO nanoparticles in treated fabrics. The treated fabrics were used to evaluate antibacterial activities against Escherichia coli and Streptococcus aureus as a model for Gram-negative and Gram-positive bacteria, respectively, using disk diffusion method in dark conditions as an in vitro model for treatment of bacterial wound infection. The procedure was more developed in terms of SnO2/ZnO molar ratio and using chitosan and citric acid to improve the antibacterial properties of the fabrics and their wash durability, respectively. The highest antibacterial activity of the fabrics was attained in a 50 min sonochemical coating process using SnO2/ZnO 1:2 molar ratio in initial sol and simultaneously deposited chitosan and citric acid. The presence of chitosan as complexing agent, citric acid as crosslink agent, and SnO2–ZnO heterojunction as important influencing parameters synergistically enhanced both the antimicrobial efficiency and maintenance of modified cotton durability after performing several washing cycles. Note de contenu : - EXPERIMENTAL SECTION : Materials reagents, and bacteria - Preparation of metal oxide sols and ultrasound-assisted of cottons - Characterization of coatings - Microbiological tests - Wash durability
- RESULTS AND DISCUSSION : Structural and morphological characterizationDOI : 10.1007/s11998-018-0057-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0057-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31140
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1133-1144[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of Fe3O4 nanoparticles with tunable sizes for the removal of Cr(VI) from aqueous solution / Yibing Feng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Synthesis of Fe3O4 nanoparticles with tunable sizes for the removal of Cr(VI) from aqueous solution Type de document : texte imprimé Auteurs : Yibing Feng, Auteur ; Yi Du, Auteur ; Zhongtao Chen ; Minxing Du ; Kai Yang ; Xingjie Lv ; Zhongfu Li Année de publication : 2018 Article en page(s) : p. 1145-1155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants
Adsorption
Caractérisation
Chrome hexavalent
Déchets industriels -- Elimination
Nanoparticules
Nanoparticules -- Synthèse
Oxyde de fer
Solutions aqueuses (chimie)
TriéthanolamineIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, size-tunable magnetite (Fe3O4) nanocrystal spheres were promptly synthesized by a facile one-pot solvothermal process with the presence of triethanolamine as an additive. The as-synthesized Fe3O4 nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy, and vibrating sample magnetometer. The results showed that the synthesized nanoparticles were in the size range of 30–350 nm, had well-defined Fe3O4 crystal phase, and had favorable saturation magnetization. The effects of various important parameters, such as initial Cr(VI) concentration, temperature, and pH, on the adsorption properties of the as-obtained Fe3O4 particles for the removal of Cr(VI) in aqueous solution were deeply analyzed and studied. The results confirmed that the adsorption efficiency was highly pH dependent, decreased with the increasing of initial concentration of Cr(VI), and increased with increasing temperature. The adsorption data were well fitted with the Langmuir isotherm. The maximum adsorption capacity calculated from the Langmuir isotherm was 56.625 mg g−1 at temperature of 35°C and pH of 2.0. Note de contenu : - EXPERIMENTAL SECTION : Chemicals - Synthesis and characterization of the adsorbent - Adsorption experiments
- RESULTS AND DISCUSSION : Adsorbent characterization - Effect of temperature and contact time - Effect of pH on removal of Cr(VI) ions from aqueous solution and the distribution of Cr(VI) and Cr(III) species in residue solutions - Effect of initial concentration of Cr(VI) and the adsorption isotherms - Adsorption mechanismDOI : 10.1007/s11998-018-0052-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0052-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31141
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1145-1155[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Shaping characteristics in alginate hydrogel encapsulation via a two-fluid spraying method / Baekhoon Seong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Shaping characteristics in alginate hydrogel encapsulation via a two-fluid spraying method Type de document : texte imprimé Auteurs : Baekhoon Seong, Auteur ; Jihoon Kim, Auteur ; Sejin Jung ; Giho Kang ; Jinkee Lee ; Doyoung Byun ; Kwang-Soo Lee ; Hyung-Seok Jang ; Jin Hwan Ko Année de publication : 2018 Article en page(s) : p. 1157-1165 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginate de sodium L'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne.
Dépôt par pulvérisation
Encapsulation
hydrocolloïdes
Liposomes
Pulvérisation
Revêtements antisalissures:Peinture antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : Recently, an alginate hydrogel containing amphiphilic liposomes was suggested for application to an antifouling coating. In this study, we investigate the shaping characteristics of the alginate hydrogel by a spraying method for application to the coating. Sodium alginate droplets from the spraying nozzle are known to be differently shaped by several external forces during the encapsulation process when such a droplet impacts onto the surfaces of liquid containing calcium ions. We adopted a two-fluid spraying method for fast alginate droplets with a scalable size suitable for mass production. Various shapes, such as mushroom, petal, sphere, and thin-sheet alginate hydrogel shapes containing liposomes, were obtained via this experimental approach. Supported by a theoretical analysis, we determined regimes for the various shapes depending on the droplet size and the concentration of the sodium alginate solution. Alginate hydrogel of different shapes based on the regimes will be used for the coating throughout a different post-processing. Note de contenu : - EXPERIMENTAL SETUP : Preparation of sodium alginate solution containing amphiphilic liposomes - Generation of alginate hydrogel containing liposomes by a two-fluid spraying technique - Characterization of the sprayed droplets - Gelation phenomenon of an impacting droplet - Characterization of the liposome-encapsulated calcium alginate hydrogel
- RESULTS AND DISCUSSION : Velocity and viscosity of the sprayed droplets - Sodium alginate droplet containing liposomes impacting on a solid substrate - Calcium alginate hydrogel containing liposomes after gelationDOI : 10.1007/s11998-018-0060-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0060-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31146
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1157-1165[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible High-performance one-pack ambient cross-linking latex binders containing low-generation PAMAM dendrimers and ZnO nanoparticles / Jana Machotova in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : High-performance one-pack ambient cross-linking latex binders containing low-generation PAMAM dendrimers and ZnO nanoparticles Type de document : texte imprimé Auteurs : Jana Machotova, Auteur ; Adela Ruckerova, Auteur ; Peter Bohacik ; Katerina Pukova ; Andrea Kalendova ; Jiri Palarcik Année de publication : 2018 Article en page(s) : p. 1167-1179 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auto-réticulation
Brillance (optique)
DendrimèresUn dendrimère 1,2est une molécule dont la forme reprend celle des branches d'un arbre. Le nom vient du grec "δενδρον"/dendron, signifiant "arbre". En 1979, le premier dendrimère a été synthétisé par D.A. Tomalia3 et d'autres chercheurs de la Dow Chemical Company, et des dendrimères ont depuis été étudiés partout dans le monde pour leur forme unique.
Dans la synthèse des dendrimères, les monomères mènent à un polymère monodisperse, tel un arbre4. Il y a deux méthodes définies de synthèse des dendrimères: synthèse divergente5,6 et synthèse convergente7. La première assemble la molécule du noyau jusqu'à la périphérie et le second de l'extérieur vers le noyau.
Les propriétés des dendrimères sont engendrées par les structures moléculaires présentes sur sa surface. Par exemple, un dendrimère peut être hydrosoluble quand son extrémité-groupe est un groupe hydrophile, comme un groupe carboxylique. Il est théoriquement possible de concevoir un dendrimère hydrosoluble avec l'hydrophobicité interne, qui lui permettrait de porter un composé hydrophobe dans son intérieur (afin de transporter un composé thérapeutique hydrophobe dans le sang par exemple).
Une autre propriété est que le volume d'un dendrimère augmente quand il a une charge positive. Si cette propriété peut être appliquée, des dendrimères peuvent être employés pour les systèmes de transport d'éléments chimiques qui peuvent donner le médicament à la partie visée à l'intérieur du corps d'un patient directement (tumeur par exemple).
Les applications sont très diverses comme un élément organique électroluminescent, comme substitut sanguin, traitement anti-cancer, outils pour la multiplication de cellules, mais aussi en matériaux lors d'associations avec des nanotubes ou comme sondes sélectives et efficaces.
Latex
Nanoparticules
Oxyde de zinc
Polyamidoamines
Résistance chimique
Revêtements -- Propriétés mécaniques
Stabilité au stockage
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : This study focuses on ambient-temperature self-crosslinking acrylic latex coating compositions containing poly(amidoamine) (PAMAM) dendrimers and ZnO nanoparticles in the role of inter-particle cross-linking agents and flash rust inhibitors. Low-generation amine-terminated PAMAM dendrimers as aqueous solutions were added into latices containing diacetone acrylamide repeat units in their polymer structure. The incorporation of ZnO nanoparticles (without any surface treatment) was performed during the synthesis of a polymer dispersion carried out by the semi-continuous emulsion polymerization technique. The latex storage stability and coating performance with respect to zinc oxide and PAMAM presence were evaluated and compared with a conventional zinc oxide-free coating composition containing adipic acid dihydrazide as the cross-linking agent. It was found that the novel latices containing both PAMAM dendrimers and ZnO nanoparticles exhibited a long-term storage stability and provided crosslinked transparent coating films of high gloss, enhanced mechanical properties, solvent resistance and excellent water whitening resistance. Moreover, the latex compositions containing PAMAM dendrimers as the inter-particle cross-linkers were shown to provide flash rust resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation and characterization of self-crosslinking latices - Evidence of self-crosslinking reaction - Storage stability testing - Preparation and characterization of coatings
- RESULTS AND DISCUSSION : MFFT of latices - Verification of self-crosslinking reaction - Storage stability evaluation - Coating properties - Water sensitivity - ZnO nanoparticles distribution in coatings - Flash rust resistanceDOI : 10.1007/s11998-018-0061-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0061-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31147
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1167-1179[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible UV irradiation grafting of acrylamide onto dopamine-modified 316L stainless steel / Nan Yao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : UV irradiation grafting of acrylamide onto dopamine-modified 316L stainless steel Type de document : texte imprimé Auteurs : Nan Yao, Auteur ; Jie Chen, Auteur ; Guochen Zhao ; Ye Huang ; Liming Yang ; Hongbin Li ; Zhenmei Sheng Année de publication : 2018 Article en page(s) : p. 1181-1189 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable
Anticorrosion
Greffage (chimie)
Métaux -- Revêtements protecteurs
PolyacrylamideLe polyacrylamide est un polymère (-CH2-CH(-CONH2)-) formé à partir d'acrylamide. Il peut être réticulé en incorporant dans le mélange de polymérisation un dérivé bi-fonctionnel de l'acrylamide : le N,N'-méthylène-bis-acrylamide (CH2=CH-CO-NH-)2CH2.
Le polyacrylamide, contrairement à l'acrylamide qui est neurotoxique, n'est pas toxique mais il doit être manipulé avec précaution car il peut contenir des résidus d'acrylamide. c'est un gel hautement absorbant. Sous forme de poudre, il se dilue dans l'eau pour former un gel visqueux après agitation vigoureuse.
Des substances ioniques telles le sel permettent au polyacrylamide de libérer les substances absorbées.
L'intérêt de ce polymère peut être apprécié dans son caractère de fluide non newtonien, et constitue un bon exemple d'application de l'effet Weissenberg: le fluide, soumis à l'action d'un agitateur magnétique remonte au centre du récipient au lieu de se plaquer sur les côtés, comme l'aurait fait un fluide newtonien classique, comme l'eau.
Polydopamine
Rayonnement ultraviolet
UltrasonsIndex. décimale : 667.9 Revêtements et enduits Résumé : UV irradiation grafting technique was applied on a modified 316L stainless steel (SS) surface. The SS sheets were first coated with dopamine by dipping in the dopamine solution with KIO3 and ultrasonication. Then, the acrylamide (AAm) was grafted onto the dopamine-modified SS samples under UV irradiation with ultrasonication, when the ketone-diol compound was used as a photoinitiating system. For comparison, the UV irradiation grafting of AAm was also performed without ultrasonication. The structures and morphologies of the samples were examined by Fourier transform IR spectroscopy, atomic force microscopy, and scanning electronic microscopy before and after modification, respectively. Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated SS. The hydrophilicity of the modified samples improved significantly, determined by the water contact angle measurement. Shown by Tafel polarization curves, the corrosion potential of modified SS was positively shifted, which demonstrated that the corrosion resistance was improved. Note de contenu : - EXPERIMENTAL : Instruments and materials - Stainless steel surface process - Deposition of poly-dopamine onto stainless steel - UV grafting of AAM onto the surface of PDS-SS - Surface characterization
- RESULTS AND DISCUSSION : Deposition of dopamine - Fourier transform IR (FTIR) spectroscopy - Surface morphologies of samples - Water contact angle test - Corrosion resistance testDOI : 10.1007/s11998-018-0095-7 Thèse : 10.1007/s11998-018-0095-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0095-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31148
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1181-1189[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Natural compounds as potential algaecides for waterborne paints / Sandra G. Gomez de Saravia in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Natural compounds as potential algaecides for waterborne paints Type de document : texte imprimé Auteurs : Sandra G. Gomez de Saravia, Auteur ; Silvia E. Rastelli, Auteur ; Guillermo Blustein ; Marisa R. Viera Année de publication : 2018 Article en page(s) : p. 1191-1200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Algicides
Antimicrobiens
Biomolécules
Composés organiques
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : To eliminate and prevent the formation of phototrophic biofilms on painted walls, chemicals are added to paints. These chemicals, in general, also have toxic effects on the environment. Plants synthesize secondary metabolites which have antimicrobial properties and that may be a sustainable alternative to traditional biocides. In this work, algal species isolated from biofilms formed on deteriorated painted surfaces were taxonomically identified. Observations with the optical microscope revealed the presence of mixed biofilms composed of algae belonging to the Cyanophyta, Chlorophyta, and Streptophyta divisions. The algaecide effect of natural compounds of vegetal origin such as anisole, eugenol, guaiacol, and thymol was evaluated by the microatmosphere technique. Growth inhibition of phototrophic organisms was obtained with thymol in all the concentrations used. Eugenol and guaiacol showed a total growth inhibition at the highest concentration assayed (300 μmol cm−2) and a decrease in growth at 40 μmol cm−2, while anisole did not exert any inhibitory action at the assayed concentrations. Due to these results, eugenol, thymol, and guaiacol were incorporated in an exterior waterborne paint at a concentration of 2%. Samples painted with these formulations were not colonized by algae, indicating that these compounds could be used as biocides in paint formulations. Note de contenu : - MATERIALS AND METHODS : Source of algae - Taxonomic determination of algae and isolation of algal taxa - Microscopic observations - Natural organic compounds - Algaecide activity tests
- RESULTS AND DISCUSSION : Taxonomic determination of algae in the sampled biofilms - Algaecide testsDOI : 10.1007/s11998-018-0099-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0099-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31149
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1191-1200[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|---|
20232 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |