Aller sur edunet
Accueil
Mention de date : 03/2021
|
Dépouillements
Ajouter le résultat dans votre panierPreparation of superhydrophilic/underwater superoleophobic membranes for separating oil-in-water emulsion: mechanism, progress, and perspective / Xinya Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
Titre : Preparation of superhydrophilic/underwater superoleophobic membranes for separating oil-in-water emulsion: mechanism, progress, and perspective Type de document : texte imprimé Auteurs : Xinya Wang, Auteur ; Weiqiu Huang, Auteur ; Lipei Fu, Auteur ; Xianhang Sun, Auteur ; Jing Zhong, Auteur ; Shaocan Dong, Auteur ; Jiahui Zhu, Auteur Année de publication : 2021 Article en page(s) : p. 285-310 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eaux usées -- Epuration
Emulsions
Huiles et graisses
Hydrophilie
Membranes (technologie)
Oléophobie
Polymères
Séparation (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : The superhydrophilic/underwater superoleophobic (SUS) membrane has attracted significant attention in the separation process of oily wastewater, especially for the oil-in-water emulsions, due to high separation efficiency and remarkable antifouling performance. In this review, the related wetting mechanisms of SUS membranes, design criteria of constructing rough surface, and recent developments in materials with SUS membranes for separating oily wastewater are detailed. According to the creative design of the micro-nano scale hierarchical surface morphology of SUS membranes, various porous membranes with surface roughness, including xD (herein, x represents 0 ~ 3) micronano, are systemically analyzed. In each section, various types of membranes are also presented with design ideas, base materials, and preparation methods. Then, the high-energy rough micro-nano structures are proposed for constructing on the surface of the membrane as a more effective method for preparing SUS membranes. Finally, conclusions and perspectives for future research are provided in depth according to the existing problems in this field. Note de contenu : - Fundamental theories and design criteria for O/W separation membranes : Surface wettability - Membrane flux - Macroissues and solutions for membranes - Design strategies for SUS membrane
- Preparation and application of SUS membranes : 0D micro-nano rough structure - 1D micro-nano rough structure - 2D micro-nano rough structure - 3D micro-nano rough structure
- Table 1 : Liquid surface energy
- Table 2 : Summary of different membranes for oil/water separationDOI : https://doi.org/10.1007/s11998-020-00428-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00428-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35596
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 285-310[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Modification of graphene and graphene oxide and their applications in anticorrosive coatings Type de document : texte imprimé Auteurs : Jing Li, Auteur ; Hongpeng Zheng, Auteur ; Li Liu, Auteur ; Fandi Meng, Auteur ; Yu Cui, Auteur ; Fuhui Wang, Auteur Année de publication : 2021 Article en page(s) : p. 311-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Epoxydes
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.
Matériaux -- Propriétés barrières
Polymères
Revêtements organiques
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : In this article, the applications and modification methods of graphene-based materials [graphene and graphene oxide (GO)] in an organic anticorrosive coating were reviewed. First, this paper introduces the application of graphene-based materials with barrier property and electrical conductivity in anticorrosive coating and then explains the protection mechanisms, respectively. In addition, this paper puts forward some problems of graphene in the anticorrosive coatings, such as how to solve the dispersion of graphene, how to improve the compatibility between graphene and the polymer matrix, and how to enhance the adhesion between the coating and metal interface. Second, this paper summarizes the reported modification methods of graphene and GO in terms of covalent and noncovalent modification. For covalent modification, the modification methods of different functional groups of GO are summarized, such as modification of epoxy group (–C(O)C–), hydroxyl group (–OH), and carboxyl group (–COOH). As for the noncovalent modification, the modification methods of graphene and GO are summarized from the three aspects of π−π interaction, hydrogen bond interaction, and electrostatic interaction, respectively. Finally, the applications of graphene-based materials in anticorrosive coatings are summarized and prospected. Note de contenu : - Graphene-based anticorrosive coatings : Application of graphene-based anticorrosive coatings - Protection mechanism of graphene-based anticorrosive coating - Problems of graphene-based fillers in anticorrosive coatings
- Modification of graphene-based materials : Covalent modification - Noncovalent modification - Comparison of modification methods
- Table 1 : Summary of covalent modification of GO
- Table 2 : Summary of noncovalent modification of graphene and GODOI : https://doi.org/10.1007/s11998-020-00435-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00435-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35597
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 311-331[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Urethane methacrylate reactive diluents for UV-curable polyester powder coatings Type de document : texte imprimé Auteurs : Theodore J. Hammer, Auteur ; Hamideh M. Shokouhi Mehr, Auteur ; Coleen Pugh, Auteur ; Mark D. Soucek, Auteur Année de publication : 2021 Article en page(s) : p. 333-348 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Caractérisation
Composés organiques -- Synthèse
Diluants
Formulation (Génie chimique)
Méthacrylate d'uréthane
Polyesters
Revêtements organiques
Revêtements poudre
Stabilité au stockage
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Three urethane methacrylates, one monofunctional derivative and two di-functional derivatives with different chain lengths were used as reactive diluents in UV-curable polyester powder coatings. Each reactive diluent was formulated with a methacrylated polyester oligomer using conventional melt extrusion techniques. The effect of these compounds on zero-shear melt viscosity was investigated. Incorporation of 10 wt% reactive diluent effectively reduced the viscosity by an order of magnitude. After UV-curing, the viscoelastic, thermal, and mechanical properties of the films were characterized using dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, and tensile tests. The type and concentration of reactive diluent that was used directly influenced the glass transition temperature, modulus, % elongation-at-break, and crosslink density. Of the two di-functional reactive diluents that were used, the derivative that contained a shorter methylene spacer group resulted in more heterogeneous crosslinked networks. Note de contenu : - EXPERIMENTAL : Materials - Techniques and instrumentation - Synthesis of hydroxyl-terminated polyester - Synthesis of methacrylated polyester (MPE) - Synthesis of bis(2-hydroxyethyl)hexane-1,6-diyldicarbamate (1A) - Synthesis of 4,13-dioxo-3,14-dioxa-5,12-diaza hexadecane-1,16-diyl bis(2-methylacrylate) (HDA-EC) (1B) - Synthesis of bis(2-hydroxyethyl) ethane-1,2-diyldicarbamate (2A) - Synthesis of 4,9-dioxo-3,10-dioxa-5,8-diazadodecane-1,12-diyl bis(2-methacrylate) (2B) - Synthesis of 2-hydroxyethyl dodecylcarbamate (3A) - Synthesis of 2-((dodecylcarbamoyl)oxy)ethyl methacrylate (DDA-EC) (3B) - Acid number calculations - Powder coating formulation and application - Thin-film preparation for DMA and tensile testing
- RESULTS : Synthesis of MPE resin - Synthesis of urethane methacrylates - Viscosity - Thermal properties - Mechanical and viscoelastic properties - Gel content - Wide-angle X-ray scattering - General coatings tests
- Table 1 : Example formulation of 5_EDA-EC
- Table 2 : Summary of the DSC and TGA data obtained from the various UV-cured samples
- Table 3 : Summary of the viscoelastic data obtained from DMA experiments
- Table 4 : Summary of the general coatings tests and storage stability analysisDOI : https://doi.org/10.1007/s11998-020-00391-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00391-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35598
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 333-348[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Simultaneous tracking of hardness, reactant conversion, solids concentration, and glass transition temperature in thermoset polyurethane coatings Type de document : texte imprimé Auteurs : Ting Wang, Auteur ; Juan José Segura, Auteur ; Erik Graversen, Auteur ; Claus Erik Weinell, Auteur ; Kim Dam-Johansen, Auteur ; Søren Kiil, Auteur Année de publication : 2021 Article en page(s) : p. 349-359 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Catalyseurs
Dureté (matériaux)
Fourier, Spectroscopie infrarouge à transformée de
Mesure
OrganostanniquesUn organoétain ou organostannique est un composé organique comportant au moins une liaison covalente entre un atome de carbone et un atome d'étain.
Il fait partie de la grande famille chimique des composés organométalliques.
L'atome de carbone lié à l'étain appartient souvent à un groupe de type éthyle, propyle ou butyle.
Les organoétains sont généralement peu solubles dans l'eau, mais très lipophiles.
Comme la plupart des composés organométalliques, les organoétains présents dans l'environnement sont souvent toxiques et écotoxiques. Les chimistes ont identifié plus de 260 composés organostanniques et 36 d'entre eux sont toxiques et écotoxiques. Tous, hormis les méthylétains ont une origine anthropique. Ils ont une longue durée de vie dans l'environnement.
Certains d'entre eux, les TBT (tributylétains, hautement toxiques pour de nombreux organismes marins, même à très faible dose, pour les algues et divers organismes marins dont les mollusques) ont été très utilisés dans les antifoulings, et sont particulièrement surveillés car hautement toxiques, rémanents dans les sédiments et sources d'imposex (changement de sexe) chez certaines espèces qui y sont exposées, dont chez des espèces commercialement importantes (bigorneau, buccin commun). (Wikipédia)
Réticulation (polymérisation)
Revêtements organiques
solvants
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, the curing and hardness evolution of a two-component polyurethane (PU) coating in four different environments, three of which were solvent evaporation-suppressed conditions, were studied. In contrast to previous studies, the simultaneous use of Fourier-transform infrared spectroscopy, gravimetric analysis, and pendulum hardness allowed a transient mapping of the degree of isocyanate conversion, solids concentration, and coating hardness. Furthermore, to explore in more detail the coupling of the underlying mechanisms, the evolution in the average coating glass transition temperature was estimated by dynamic mechanical analysis, and the data was simulated using the so-called Kelley–Bueche equation. For the curing conditions investigated, the final coating hardness differed by a factor of two, with the lowest values obtained for the evaporation-suppressed conditions. Due to the isocyanate groups reaching full conversion for all four series, the reason for the lower hardness was attributed entirely to the plasticizing effect of residual solvent. Using a Kα value of 0.687 in the Kelley–Bueche equation, the coating glass transition temperature as a function of the PU volume fraction could be successfully simulated and was found to increase from about 282 K at a volume fraction of 0.79 to 319 K at one of 0.93. In addition, when the experimental temperature was lower than the coating glass transition temperature, a proportional increase in the pendulum hardness with the reciprocal loss factor was seen. The effects of catalyst concentration in the coating were also investigated, and this parameter was found to have a strong influence on both the surface conversion, the solids concentration, and the coating hardness. A too fast curing rate shortens the time to vitrification, after which the solvent evaporation rate becomes diffusion-controlled and very low, leading to higher residual solvent contents and significantly lower hardness values. The results obtained provide guidelines for how to optimize ventilation conditions during the curing of solvent-based, thermoset PU coatings. Note de contenu : - OVERVIEW OF THE MECHANISMS UNDERLYING SIMULTANEOUS SOLVENT EVAPORATION AND CHEMICAL CURING OF A THERMOSET PU COATING
- EXPERIMENTAL : Sample preparation - Curing conditions - Experimental procedures - FTIR spectroscopy of the coating samples - Pendulum hardness measurements - Dynamic mechanical analysis
- RESULTS AND DISCUSSION : FTIR analysis - Effect of curing conditions on hardness - Effect of residual solvent concentration on the mechanical properties - Effect of catalyst concentration on hardness of coatings
- Table 1 : The four different curing conditions used in the experiments
- Scheme 1 : Crosslinking reaction of an isocyanate and a polyol to form a urethane linkage. R and R' symbolize alkyl or aryl groupsDOI : https://doi.org/10.1007/s11998-020-00407-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00407-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35599
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 349-359[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Bio-inspired fabrication of superhydrophilic and underwater superoleophobic alumina membranes for highly efficient oil/water separation Type de document : texte imprimé Auteurs : Wenjin Zhou, Auteur ; Mingyang Zhou, Auteur ; Huapeng Zhang, Auteur ; Hongyan Tang, Auteur Année de publication : 2021 Article en page(s) : p. 361-372 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine
Caractérisation
Essais (technologie)
Essais de résilience
Hydrophilie
Matériaux -- Propriétés antisalissures
Membranes (technologie)
Mouillabilité
Oléophobie
Polyéther imide
Séparation huile/eauIndex. décimale : 667.9 Revêtements et enduits Résumé : Inspired by fish scales, superhydrophilic and underwater superoleophobic alumina membranes were fabricated in this study. Dopamine deposited on the surface of alumina membranes through immersion over time, and then crosslinking reaction occurred with polyethyleneimine (PEI), which was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. It induced the modified layer coated on the membrane surface. Values of water contact angle of the modified alumina membranes were ~ 0° in air. Values of underwater oil contact angle reached 155°, which indicated it was superhydrophilic and underwater superoleophobic. More particles engendered with the increase in the reaction time with PEI, which induced the decrease in the pore sizes and permeation flux. All values of oil rejection were higher than 98.5%. No obvious deterioration of permeation flux could be found. The rejection hardly suffered a sharp decline over 800 min. It indicates that the modified layer can firmly stick to the alumina membranes. Therefore, the as-prepared alumina membrane is promising for practical oil/water separation. Note de contenu : - MATERIALS AND METHODS : Materials and chemicals - Modification of alumina membranes - Characterization and measurement - Abrasion experiment - Separation experiments
- RESULTS AND DISCUSSION : Surface morphology of the membranes - Chemical composition on the surface - Surface wettability - Separation performance - Antifouling property of the modified membranes
- Table 1 : The modification parameters of the asprepared alumina membranesDOI : https://doi.org/10.1007/s11998-020-00406-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00406-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35600
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 361-372[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Characterization, coating and biological evaluation of polyol esters rosin derivatives as coating films Type de document : texte imprimé Auteurs : A. A. Soliman, Auteur ; M. M. Elsawy, Auteur ; N. A. Alian, Auteur ; N. O. Shaker, Auteur Année de publication : 2021 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Caractérisation
ColophaneLa colophane est le résidu solide obtenu après distillation de la térébenthine, oléorésine (appelée aussi gemme), substance récoltée à partir des arbres résineux et en particulier les pins (le genre Pinus) par une opération que l'on appelle le gemmage.
La colophane est solide et cassante à température ambiante. Sa couleur va du jaune très clair au quasi noir en fonction essentiellement de la conduite de la distillation, la couleur ou grade est défini par une échelle de lettre allant de D pour le plus foncé à X pour le plus clair. La colophane ne fond pas mais se ramollit avec la chaleur, son point de ramollissement se situant autour de 70 °C.
Cette résine a les propriétés de coller et d'imperméabiliser. Elle fait partie des liants utilisés dans les antifoulings.
La colophane est composée à 90% d’un mélange d’acides organiques de la famille des diterpènes appelés acides résiniques, qui répondent à la formule brute C20H30O2. Ces acides résiniques sont des isomères. La proportion des différents acides résiniques dans la colophane est variable suivant l’espèce de pin à partir de laquelle la colophane a été obtenue. Certains acides ne sont présents que chez certaines espèces (et leur sont donc caractéristiques).
La colophane (ou « rosine ») a de nombreux usages. On la trouve notamment dans les peintures antifouling où elle se substitue au tributylétain interdit.
C'est un irritant et un allergisant pour la peau et les voies respiratoires, sous forme pure ou par ses produits de dégradation.
Enrobage (technologie)
Esters
Polyols
Revêtements -- Analyse
Revêtements -- Propriétés chimiques
Revêtements -- Propriétés mécaniques
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyol esters materials, which have been developed from ethylene glycol, glycerol, pentaerythritol and sorbitol with rosin, were investigated for their formed films and coating properties. Films were dried and characterized for chemical and mechanical resistances. Their films were highly resistant to water, solvents (acetone, toluene and methanol), and acids (10% hydrochloric acid and 20% sulfuric acid) and poorly resistant to alkali (10% sodium hydroxide) as well as adhesion, tensile strength, elongation test, modulus of elasticity, pinhole test and scratching and flexibility tests. Incorporation of ethylene glycol, glycerol, pentaerythritol and sorbitol with rosin was done to achieve good mechanical characteristics and high chemical resistance to these films. The prepared compounds were tested for antibacterial activity against Trametes versicolor and Gloeophyllum trabeum. Note de contenu : - MATERIALS AND METHODS
- CHARACTERIZATION OF BIOMATERIALS : Free film preparation and characterization - Bioactivity of rosin derivatives
- RESULTS AND DISCUSSION : Synthesis of polyol esters of maleic rosin (EGMR, GMR, PMR, SMR) - Physicochemical properties - Evaluation of film properties -
- Table 1 : Characterization of biomaterials derivatives
- Table 2 : Drying time characteristic data of biomaterials
- Table 3 : Water resistance data of biomaterials
- Table 4 : Acid resistance of 10% HCl of biomaterials
- Table 5 : Acid resistance of 20% H2SO4 of biomaterials
- Table 6 : Alkali resistance of 10% NaOH of biomaterials
- Table 7 : Acetone resistance of biomaterials
- Table 8 : Toluene resistance of biomaterials
- Table 9 : Methanol resistance of biomaterials
- Table 10 : Mechanical characteristics of stoved films of biomaterials
- Table 11 : Average diameter of inhibition zone of control of biomaterials against Trametes versicolor and Gloeophyllum trabeum in 0.025 mmDOI : https://doi.org/10.1007/s11998-020-00408-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00408-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35601
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 373-381[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Fabrication of graphene-coated poly(glycidyl methacrylate) microspheres by electrostatic interaction and their application in epoxy anticorrosion coatings Type de document : texte imprimé Auteurs : Meng Li, Auteur ; Yiyi Li, Auteur ; Jiatian Zhang, Auteur ; Dandan Zhang, Auteur ; Jie Li, Auteur ; Kaibin He, Auteur ; Yiting Xu, Auteur ; Birong Zeng, Auteur ; Lizong Dai, Auteur Année de publication : 2021 Article en page(s) : p. 383–396 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Composites
Epoxydes
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.
Polyméthacrylate de glycidyle
Revêtements organiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : The uneven dispersion of graphene in the resin matrix hinders its application in anticorrosion coatings. This study reports a new method where graphene oxide (GO) is coated on the surface of the poly(glycidyl methacrylate) (PGMA) microspheres to promote the dispersion of GO in epoxy resin (EP) to improve the anticorrosion performance of EP. GO-coated PGMA microspheres (PGMA@GO) were successfully fabricated by electrostatic interaction, which was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and zeta potential analysis. The scanning electron microscopy results showed that the PGMA microspheres were uniformly coated with GO, when the weight ratio of PGMA@GO was 1:2 (PGMA: GO). Electrochemical impedance spectroscopy and salt immersion experiments were performed to evaluate the corrosion resistance of the EP composite coatings. Comparing with pure EP and GO/EP coatings, the mechanical properties and anticorrosion properties of coatings were improved after adding PGMA@GO. When the addition amount of PGMA@GO (of 50 g EP) was 1.0 wt% and about 0.67 wt% GO was only needed, the PGMA@GO/EP composite coating possessed a high impedance of 5.68 × 108 Ω cm2 and a low breakpoint frequency of 0.39 Hz for 21-day immersion in 3.5 wt% NaCl solution. The anticorrosion mechanism of PGMA@GO/EP composite coating was also discussed. Note de contenu : - EXPERIMENTAL : Materials - Characterizations - Functionalization of graphene oxide - Preparation of PGMA@GO/EP composite coating
- RESULTS AND DISCUSSION : Structural properties of PGMA@GO - The optimal weight ratio of PGMA@GO - Characterization of PGMA@GO/EP and GO/EP composite coating - Anticorrosion performance of PGMA@GO/EP and GO/EP composite coating - Anticorrosion mechanism of PGMA@GO/EP composite coating
- Table 1 : Main recipes of the anticorrosion composite coatings
- Table 2 : Zeta potentials of GO, PGMA, CTAB, PGMA–CTAB, and PGMA@GO (1:2) in deionized water
- Table 3 : Low frequency impedance (|Z|0.01Hz) of EP, 1.0% PGMA/EP, 0.5% GO/EP, 1.0% GO/EP, 1.5% GO/EP, 2.0% GO/EP, 0.5% PGMA@GO/EP, 1.0% PGMA@GO/EP, 1.5% PGMA@GO/EP, and 2.0% PGMA@GO/EP composite coatings during different immersion times in 3.5 wt% NaCl solution
- Table 4 : Breakpoint frequency (fb) of the composite coatings with different additivesDOI : https://doi.org/10.1007/s11998-020-00409-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00409-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35602
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 383–396[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Comparative study on the degradation of a zinc-rich epoxy primer/acrylic polyurethane coating in different simulated atmospheric solutions Type de document : texte imprimé Auteurs : Wei Sun, Auteur ; Chao Xing, Auteur ; Xiaobo Tang, Auteur ; Yu Zuo, Auteur ; Yuming Tang, Auteur ; Xuhui Zhao, Auteur Année de publication : 2021 Article en page(s) : p. 397–413 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atmosphère marine
Copolymère uréthane acrylique
Corrosion
Epoxydes
Primaire (revêtement)
Revêtements -- Détérioration
Revêtements organiques
Spectroscopie d'impédance électrochimique
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : The degradation of a zinc-rich epoxy primer/acrylic polyurethane coating system on carbon steel was studied in the simulated marine atmospheric solution (0.05% NaCl), industrial atmospheric solution (0.35% (NH4)2SO4), and marine-industrial atmospheric solution (0.05% NaCl + 0.35% (NH4)2SO4), by electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy methods. The influences of the soluble contaminants in the atmospheres, including chloride ions, sulfate ions, and ammonium ions, on the coating failure mechanism were compared and analyzed. The results showed that the degradation speed of the coating system in three simulated atmospheric solutions is in the following order: simulated marine atmosphere > simulated marine-industrial atmosphere > simulated industrial atmosphere. The degradation is mainly related to the permeation rate of the water through the coating. The aggressive ions, basic cations, and the property of the corrosion products also have influences on the degradation process. The alternating temperature environment (45°C 12 h + 25°C 12 h) could increase the degradation speed of the coating and the difference of the speed in the three solutions. Note de contenu : - EXPERIMENTAL : Materials and samples preparation - Corrosion tests and measurements -
- RESULTS AND DISCUSSION : EIS results and the morphology of the coatings - FTIR results and SEM morphology of the coatings
- Table 1 : Coating specifications
- Table 2 : The impedance parameters of the coating sample in 0.05% NaCl solution under alternating hot and cold temperature condition
- Table 3 : The impedance parameters of the coating sample in 0.35% (NH4)2SO4 solution under alternating hot and cold temperature condition
- Table 4: The impedance parameters of the coating sample in 0.05% NaCl + 0.35% (NH4)2SO4 solution under alternating hot and cold temperature conditionDOI : https://doi.org/10.1007/s11998-020-00410-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00410-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35603
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 397–413[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Preparation and characterization of polyacrylate composite and its application in superhydrophobic coating based on silicone-modified ZnO Type de document : texte imprimé Auteurs : Changpo Ma, Auteur ; Yongzan Li, Auteur ; Jian Zhang, Auteur ; Feng Ning, Auteur ; Minxia Kang, Auteur ; Hui Li, Auteur ; Zumin Qiu, Auteur Année de publication : 2021 Article en page(s) : p. 415-433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Emulsions
Hydrophobie
Nanoparticules
Oxyde de zinc
Polyacrylates
Revêtements organiques
Rugosité
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a kind of silicone containing double bond and hydrogen bond has been synthesized via telomerization. In order to disperse and incorporate ZnO into the polymer matrix, ZnO was modified with silicone. Finally, ZnO/polyacrylate and silicone/polyacrylate composites were prepared using modified ZnO and silicone. The present study reports synthesis and characterization of ZnO/polyacrylate and silicone/polyacrylate nanocomposites by in situ emulsion polymerization. The effects of ZnO and silicone on the morphological structure and thermal properties of composites were systematically studied. The composites were characterized using FTIR, XRD, SEM, TEM, TGA, particle size analysis, UV, and WCA. It could be seen that the thermal degradation temperature of the composites increased significantly with the addition of ZnO and silicone. SEM analysis showed that the films were evenly distributed with the surface-modified ZnO nanoparticles. Then, the modified ZnO/polyacrylate superhydrophobic composite coating was prepared using modified ZnO and silicone/polyacrylate emulsion. The coating has excellent self-cleaning and oil–water separation properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of a silicone containing double bond and hydrosilane bond - Preparation of silicone-modified ZnO nanoparticles - Preparation of ZnO/polyacrylate nanocomposite emulsion - Preparation of silicone/polyacrylate nanocomposite emulsion - Preparation of modified ZnO/polyacrylate superhydrophobic composite coating - Characterization
- RESULTS AND DISCUSSION : FTIR analysis - XRD analysis - SEM analysis - TEM analysis - TG analysis - Particle size distribution - UV resistance - Water contact angle and water absorption
- APPLICATION OF MODIFIED ZNO/POLYACRYLATE SUPERHYDROPHOBIC COMPOSITE COATING : The microstructure of the coating - Stability of superhydrophobic coating - Application of superhydrophobic coating
- Scheme 1 : Preparation of a silicone containing double bond and hydrosilane bond
- Scheme 2 : Preparation of silicone-modified ZnO nanoparticles
- Scheme 3 : Preparation of ZnO/polyacrylate nanocomposite emulsion
- Scheme 4 : Preparation process of superhydrophobic coating
- Table 1 : General recipe for preparation of ZnO/polyacrylate nanocomposite emulsion
- Table 2 : General recipe for preparation of silicone/polyacrylate nanocomposite emulsion
- Table 3 : Thermogravimetric parameters of polyacrylate
- Table 4 : The GPC of polyacrylate
- Table 5 : Roughness parameters of samplesDOI : https://doi.org/10.1007/s11998-020-00411-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00411-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35604
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 415-433[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Vapor phase assembly of benzotriazole and octadecylamine complex films on aluminum alloy surface Type de document : texte imprimé Auteurs : Hong-Liang Zhang, Auteur ; Da Quan Zhang, Auteur ; Li Xin Gao, Auteur ; Yan-Yan Liu, Auteur ; Hong-Bin Yan, Auteur ; Shi-Li Wei, Auteur ; Teng-Fei Ma, Auteur Année de publication : 2021 Article en page(s) : p. 435-446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages
AluminiumL'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Anticorrosifs
Anticorrosion
Benzotriazole
Couches minces
Electrochimie
Essais (technologie)
Hydrophobie
Mesure
Métaux -- Revêtements protecteurs
Mouillabilité
Octadécylamine
Systèmes auto-assemblésIndex. décimale : 667.9 Revêtements et enduits Résumé : The complex films of benzotriazole and octadecylamine have been prepared on the surface of aluminum alloy via vapor phase self-assembly method. Their anticorrosion and wettability are investigated by the electrochemical measurements and the contact angle tests. It shows that the complex films have a better protection effect on aluminum alloys compared with the single component films. The performance of the complex films is related to the sequence of vapor phase self-assembly. The formation mechanism of the different complex films is discussed based on the self-assembly sequence. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Preparation of SAMs on aluminum alloy surface - Volatile mass-loss test - Electrochemical measurements - Wettability test - FTIR spectra - Corrosion morphology - MD simulations
- RESULTS AND DISCUSSION : Volatile mass-loss test - Variation of the open circuit potential - Electrochemical impedance spectra - Hydrophobicity test - FTIR spectra - SEM images - Formation model of SAMs on aluminum alloy surface
- Table 1: EIS parameters of aluminum alloy without and with SAMs in the stimulated atmospheric corrosion water (assembly at 25°C)
- Table 2: EIS parameters of aluminum alloy without and with SAMs in the stimulated atmospheric corrosion water (assembly at 50°C)
- Table 3 : Comparison of IR characteristic bands for different SAMs formed on aluminum alloy specimen surface
- Table 4 : Table 4: The element composition (wt%) of the different assembled film in EDS mapping spectraDOI : https://doi.org/10.1007/s11998-020-00405-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00405-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35605
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 435-446[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Recycle of magnesium alloy scrap for improving fire resistance, thermal stability, and water tolerance of intumescent fire-retardant coatings Type de document : texte imprimé Auteurs : Cheng Wang, Auteur ; Siqi Huo, Auteur ; Shi Liu, Auteur ; Qinghua Hu, Auteur ; Qi Zhang, Auteur ; Zhitian Liu, Auteur Année de publication : 2021 Article en page(s) : p. 447-458 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Eau
Emulsions
Formulation (Génie chimique)
Intumescence (chimie)
Magnésium -- Alliages
Polyacrylates
Recyclage (déchets, etc.)
Résistance à l'humidité:Résistance à l'eau
Revêtements protecteurs
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The rapid development and widespread application of magnesium alloy bring about a significant amount of magnesium alloy scrap. Thus, we offer a feasible and simple way to realize the recycling of magnesium scrap in this work, applying it as a synergist in the intumescent fire-retardant coatings for steel structure. With the introduction of magnesium scrap, the fire resistance, thermal stability, and water tolerance of the as-prepared coatings significantly improved. According to ASTM E119 standards, the fire resistance of coatings was investigated in our laboratory. Adding only ~ 0.48 wt% of the scrap decreased the backside temperature of the coated steel from 310°C to 171°C, with a ~ 44.8% reduction, indicating obvious synergy. Moreover, the coating containing ~ 0.48 wt% scrap exhibited excellent thermal stability and water resistance, and its char yield at 800°C and water contact angle reached up to 27% and 80.6°, respectively. Based on the analysis of flame-retardant mechanism, the scrap and intumescent fire-retardant system jointly promoted the formation of an intumescent and compact char residue, thus suppressing the heat transfer and protecting the steel. Hence, using magnesium alloy scrap as a synergist contributed to realizing the recycling of waste and providing practical intumescent fire-retardant coatings for structural steel. Note de contenu : - EXPERIMENTAL : Materials - Preparation of scrap-modified core–shell polyacrylate emulsions - Preparation of intumescent fire-retardant coatings - Characterizations
- RESULTS AND DISCUSSION : Characterization of magnesium alloy scrap - Stability of the scrap-modified core–shell emulsion - Fire resistance of coatings - Influence of scrap on the char residue - Thermal stability of coatings - Water tolerance of coatings
- Table 1 : The formulation of core–shell polyacrylate emulsion
- Table 2 : The compositions of intumescent fire-retardant coatings
- Table 3 : Contents of C, O, Mg, Al, Si, and Ca in magnesium alloy scrap
- Table 4 : The influence of scrap on the stability of emulsionDOI : https://doi.org/10.1007/s11998-020-00413-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00413-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35606
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 447-458[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Correlative studies on the properties of rubber seed and soybean oil-based alkyd resins and their blends Type de document : texte imprimé Auteurs : Ikhazuagbe H. Ifijen, Auteur ; Hamilton D. Odi, Auteur ; Muniratu Maliki, Auteur ; Stanley O. Omorogbe, Auteur ; Aireguamen I. Aigbodion, Auteur ; Esther U. Ikhuoria, Auteur Année de publication : 2021 Article en page(s) : p. 459-467 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Formulation (Génie chimique)
Huile de graine de caoutchouc
Huile de soja
Mélanges (chimie)
Polyalkydes
Polyesters
Polymères -- Synthèse
Revêtements organiques
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : This study aims at synthesizing alkyd resins from rubber seed oil (RSO), soybean oil (SBO), and their blends via the monoglyceride route. Oil extracted from rubber seeds was blended with soybean oil at various blending ratios (80:20, 70:30, 50:50, 30:70, and 10:90). Thereafter, the blends were employed in the synthesis of polyesters (alkyd resins) via alcoholysis technique. The alkyd samples synthesized from the RSO, SBO, and their respective blends were characterized for comparative purpose. The RSO-/SBO-based alkyds and aforementioned blends have iodine values of 157.90/142.00, 152.44, 149.90, 143.16, 142.26, and 142.41 gI2/100 g and saponification values of 216.21/228.61, 203.67, 171.04, 161.97, 142.89, and 135.62 mgKOH/g, respectively. The drying property (set-to-touch time and the tack free) of the 100% RSO-based alkyd resin did not experience any significant improvement as the blending proportion of SBO in RSO increases. The tack-free and dry-through times for the blends were estimated to be around 129–133 and 236–243 min, respectively. Huggins and Kraemer viscosity relationship was used to extrapolate the intrinsic viscosities of the RSO- and SBO-based alkyds and their corresponding blends. The blends showed resistance to brine, water, and acid. However, only some exhibited fair resistance to alkali. The results from the investigation revealed that the alkyds prepared using a blend of RSO/SBO oil possess coating properties whose values are comparable to those of commercial polyesters. However, the studied SBO cannot be considered as good blending oil with RSO for the preparation of alkyd for the improvement of drying properties. Note de contenu : - MATERIALS AND METHODS : Synthesis of alkyd resin samples - Characterization of the alkyd samples - Chemical constituent of RSO and SBO - Preparation of alkyd coatings for performance characteristics - Viscosity measurement
- RESULTS AND DISCUSSION : Physiochemical characteristics of the alkyd samples - Drying characteristics of the alkyd films - Viscosity analysis
- Table 1 : Formulation of the synthesized alkyd resin
- Table 2 : Physiochemical properties of the RSO and SBO
- Table 3 : Physico-chemical properties of RSO and SBO alkyd resin
- Table 4 : Drying schedule for formulated alkyd resin
- Table 5 : Chemical resistance of the alkyd film to different solvent media
- Table 6 : Estimated solution parameters of alkyd samples
- Scheme 1 : Monoglyceride process of rubber seed oil-modified alkyd synthesis
- Scheme 2 : Monoglyceride process of soybean oil-modified alkyd synthesisDOI : https://doi.org/10.1007/s11998-020-00416-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00416-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35607
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 459-467[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes Type de document : texte imprimé Auteurs : H. R. Asemani, Auteur ; V. Mannari, Auteur Année de publication : 2021 Article en page(s) : p. 469-488 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétoacétate
Caractérisation
Essais (technologie)
Matériaux hybrides
Michael, Addition deL'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées.
Cette réaction doit son nom au chimiste américain Arthur Michael.
Oligomères
Photoréticulation
Polymères -- Synthèse
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Revêtements sans isocyanates
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Preparation of ambient and UV curing non-isocyanate polyurethane (NIPU) coatings has been reported using a series of acetoacetylated non-isocyanate polyurethane (AA-NI-PUPO) oligomers. Synthesized oligomers were characterized using various techniques such as Fourier transform infrared and nuclear magnetic resonance spectroscopy. AA-NI-PUPOs showed significantly lower viscosity compared to their non-acetoacetylated counterparts. Ambient temperature-cured systems were formulated by mixing AA-NI-PUPOs and different primary amine compounds in stoichiometric proportions. Michael addition reaction of acrylates and AA-NI-PUPOs was initiated by UV curing using a photobase generator as the catalyst. NIPU coatings were studied for various thermo-mechanical properties and corrosion resistance. The selected UV-cured and ambient-cured samples showed instant and 1-h tack-free time, respectively. Results revealed that with proper selection of acetoacetylated resin and crosslinker type, coatings with properties comparable to conventional PU coatings could be formulated. Moreover, UV-curable coatings with up to 90 wt% solid could be formulated using conventional monomeric acrylates as a reactive diluent. The study demonstrates the feasibility of formulating solvent-free rapid ambient curing non-isocyanate polyurethane coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of oligomers - Preparation of coating compositions - Test methods
- RESULTS AND DISCUSSION : Characterization of AA-NI-PUPOs - Viscosity measurements - Curing characterization of UV-NIPUs - Cured-film properties
- Table 1 : List of acronyms used to identify oligomers and coating systems
- Table 2 : Characteristics of different resins used in this study (Mn: number average molecular weight, AA : acetoacetate)
- Table 3 : Screening results for A-NIPU coating samples
- Table 4 : Screening results for UV-NIPU coating samples
- Table 5 : Extended coating properties for selected A-NIPU coating samples
- Table 6 : Extended coating properties for selected UV-NIPU coating samples
- Table 7 : Tg, Td5% and Td50% values obtained from DSC and TGA analyses for selected NIPU coating samplesDOI : https://doi.org/10.1007/s11998-020-00425-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00425-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35608
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 469-488[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Rapid fabrication of large-scale structurally colored PS@SiO2 films with enhanced self-cleaning capability Type de document : texte imprimé Auteurs : Fen Wang, Auteur ; Fuqiang Guo, Auteur ; Yu Xue, Auteur ; Hongjie Luo, Auteur ; Jianfeng Zhu, Auteur Année de publication : 2021 Article en page(s) : p. 489-499 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur
Dioxyde de silicium
Hydrophobie
Oléophobie
Polystyrène
Revêtement auto-nettoyant
Revêtements -- Propriétés optiques
Revêtements organiques
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : Structural colors are widespread in myriads of natural living organisms measuring from tens to hundreds of nanometers. In recent years, amorphous photonic crystal films have received extensive attention due to their stable color rendering properties. However, the internal structure of the films is easy to be contaminated by liquid. Thus, self-cleaning performance has been considered as one of the main obstacles to the practical application of artificial structural colored films. In order to solve the issues, we used heptadecafluoro-1,1,2,2-tetrahydrodacyl trimethoxysilane to modify the structural colored films. The results demonstrated that the modified colored films showed super-hydrophobic (contact angle > 160°) and high oleophobic (contact angle > 150°) properties. The rapid production of water-resistant and oil-resistant structural color coatings by spraying is significant for expanding their application in outdoor conditions (e.g., acid–base, alkali base, pollution) for a long time. Note de contenu : - EXPERIMENTAL : Chemicals and materials - Experimental process - Characterization
- RESULTS AND DISCUSSION : Morphology of PS@SiO2 spheres - Optical properties of the structural colored films - Wettability and stability of PS@SiO2 surfaces coated with HFTHTMS
- Scheme 1 : Schematic diagram for the synthesis of a stable amphiphobic PS@SiO2/AC filmsDOI : https://doi.org/10.1007/s11998-020-00418-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00418-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35609
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 489-499[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Corrosion mitigation of carbon steel in acidic and salty solutions using electrophoretically deposited graphene coatings Type de document : texte imprimé Auteurs : Asmaa R. Heiba, Auteur ; Fatma A. Taher, Auteur ; Rabab M. Abou Shahba, Auteur ; Nabil A. Abdel Ghany, Auteur Année de publication : 2021 Article en page(s) : p. 501-510 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone
Anticorrosion
Caractérisation
Dépôt électrophorétique
Métaux -- Revêtements protecteurs
Oxyde de graphèneIndex. décimale : 667.9 Revêtements et enduits Résumé : In the modern metal finishing industry, corrosion protection plays a critical role, with many coatings created to prevent this phenomenon (corrosion) and protect the metals. Nano-coating has of late been used to develop corrosion-resistant metal composites. Recently, layers of graphene-based materials with extraordinary properties have been successfully manufactured and applied through electrophoretic deposition (EPD). This article summarizes work altering the graphene oxide (GO) content, which was prepared using an adapted Hummers' method and then the simultaneous reduction of the GO suspension by the EPD method into graphene nano-coating on carbon steel. Different parameters were optimized, namely applied voltage, deposition time, and GO concentration. Scanning electron microscopy and X-ray diffraction were used to characterize the coatings. The corrosion resistance of these coatings was measured by electrochemical polarization in aqueous solutions under accelerated corrosion conditions. The results show not only that EPD is a simple technique that allows creating a graphene coat on carbon steel from GO suspension, but also that it forms a graphene nano-coating which provides significant protection against corrosion of steel in acidic and salty solutions. Note de contenu : - EXPERIMENTAL : Materials and solutions - Synthesis of GO - Electrophoretic deposition (EPD) of GO - Electrochemical corrosion test - Characterizations
- RESULTS AND DISCUSSION : Characterization of synthesized GO - Electrophoretic deposition parameters
- CORROSION STUDIES : Weight loss technique - Potentiodynamic polarization technique - Surface examination by scanning electron microscopy (SEM)
- Table 1 : The chemical composition of carbon steel electrode used for the present study
- Table 2 : Corrosion parameters obtained from potentiodynamic polarization of uncoated and coated C-steel electrodes at different conditions at 25°CDOI : https://doi.org/10.1007/s11998-020-00419-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00419-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35610
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 501-510[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Developing a new superhydrophilic and superoleophobic poly(4-(1-vinyl-1H-imidazol-3-ium-3-yl) butane-1-sulfonate): vinyl imidazole@Perfluorooctanoic acid@SiO2 coated stainless steel mesh for highly efficient, stable, and durable oil/water separation Type de document : texte imprimé Auteurs : Mohammad Reza Ghadimi, Auteur ; Roozbeh Siavash Moakhar, Auteur ; Setare Amirpoor, Auteur ; Mohammad Azad, Auteur ; Abolghasem Dolati, Auteur Année de publication : 2021 Article en page(s) : p. 511-521 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Nanostructures
Polymères
Revêtements organiques
Séparation huile/eauIndex. décimale : 667.9 Revêtements et enduits Résumé : The design and development of efficient approaches for water–oil separation have had widespread interest. Most previously introduced techniques and materials used for development of the successful separation of oily wastewater could not answer all the desired demands, such as being efficient and environmentally and economically friendly. Therefore, in seeking a novel method capable of answering these expectations, surfaces with special wettability were introduced. A novel, reusable, and recyclable superhydrophilic and superoleophobic poly(Vsim-Vim)@PFOA@SiO2 nanocomposite-coated stainless steel mesh was synthesized through a facile preparation process. Since the most important factors of these coatings are their oleophobicity and hydrophilicity values, the water contact angle (WCA) and the oil contact angle (OCA) were measured. The coating indicated the excellent characteristics in which the results showed that WCA was 0°, while OCA was 142°, which confirmed remarkable superhydrophilicity and superoleophobicity, respectively. It is worth mentioning that the coating owes its surface behavior mainly to the finer size of mesh and formation of silica, which causes the higher roughness and better oleophobicity, reduction of the surface energy of the synthesized poly(Vsim-Vim)@SiO2 nanocomposite by PFOA, the formation of hierarchical micro-nanometer scale roughness structures on the coating surface, and stable adhesion of SiO2 nanoparticles into poly(Vsim-Vim). Eventually, superb oil/water separation efficiency of 95% with high stability was attained. This result implied that the fabricated coating is a suitable candidate for water–oil emulsion separation which can potentially be employed in green industrial applications. Also, we believe this approach provides a potential application in controllable oil/water separation in large volumes. Note de contenu : - Table 1 : The sol of poly(Vsim-Vim)@PFOA@SiO2 nanocomposite for 15 mL water solvent
- Table 2 : The atomic percentage of substances due to EDS results before and after a durability test in water for 10 daysDOI : https://doi.org/10.1007/s11998-020-00420-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00420-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35611
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 511-521[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Water vapor transmission properties of acrylic organic coatings Type de document : texte imprimé Auteurs : Réka Lilla Kovács, Auteur ; Lajos Daróczi, Auteur ; Péter Barkóczy, Auteur ; Eszter Bakonyi, Auteur ; Szilvia Kovàcs, Auteur ; Zoltàn Erdélyi, Auteur Année de publication : 2021 Article en page(s) : p. 523-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick.
Essais accélérés (technologie)
Perméabilité
Polyacryliques
Revêtements organiques
Solubilité
Test d'immersion
Transmission de vapeur d'humidité
Vapeur d'eauIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, we evaluate the water vapor transmission rate (WVTR), the permeability (P), solubility (S), and diffusion (D) coefficients of Paraloid B44, Paraloid B72, and Incralac coatings in the temperature range of 5–35°C. The Arrhenius function—diffusion activation energy and preexponential factor—has also been determined from the data: DB44=35.2cm2s−1exp(−25kJ mol−1/RT); DB72=9.5cm2s−1exp(−23kJ mol−1/RT); DIncralac=622.8cm2s−1exp(−28kJ mol−1/RT). These resins are important coating materials, for example, for conservators to protect metallic artifacts, such as statues, against corrosion. Despite Paraloid B44 and B72 resins being considered as reference materials in conservation practice, that is, new coating materials (either water vapor retarders or transmitters) are often compared to them, there are no comprehensive data for the quantities describing the vapor permeability (P, S, D) of these materials. The measurements are based on the ISO cup-method using substrate/coating composite samples. The strength of this technique is that it can also be used when the coating is non-self-supporting; nevertheless, P, S, and D can be deduced for the coating layer itself, and it seems to be a standardizable procedure for comparative performance testing of coating materials. Paraloid B72 layers exhibited higher WVTRs—from 39 to 315 g m−2 day−1 as the temperature increased from 5 to 35°C—compared to Paraloid B44 and Incralac coatings—from 17 to 190 g m−2 day−1, respectively. The transmission rate parameters were also compared to the results of corrosion tests. Incralac was the most effective corrosion inhibitor, and the performance of the B44 was better than the B72, which is in good agreement with the transmission rate tests. Note de contenu : - MATERIALS AND METHODS
- CALCULATIONS : Permeability - Solubility - Diffusion coefficient
- RESULTS AND DISCUSSION : Water vapor transmission rate, solubility and diffusion coefficient - Immersion corrosion test
- Table 1 : Diffusion activation energy and preexponential factors for the different resins determined from the Arrhenius plot
- Table A1 : Measured water vapor transmission rate (WVTR) and total mass of absorbed vapor M1 for the laminated paper (substrate) and for substrate/resin coating composites
- Table A2 : Calculated WVTRs, permeability, solubility/absorptivity, and diffusion coefficients for the resinsDOI : https://doi.org/10.1007/s11998-020-00421-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00421-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35612
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 523-534[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings Type de document : texte imprimé Auteurs : Raj Shree, Auteur ; R. Baloji Naik, Auteur ; Rupesh S. Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2021 Article en page(s) : p. 535–547 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Charbon, Cendres de
Composés organiques -- Synthèse
Epoxydes
Essais de comportement au feu
Fourier, Spectroscopie infrarouge à transformée de
Gommes et résines
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Phosphates
Polyphosphorique, Acide
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Transparent intumescent fire-retardant (IFR) coatings are the newest passive fireproofing materials which maintain structural integrity without losing aesthetic appearance of the substrate. In this present paper, effects of three IFR coatings with structurally different epoxy resins, namely aliphatic, cycloaliphatic, and aromatic, on the fire resistance, transparency, and physicomechanical properties were investigated. Different phosphate resin acids (PRA) were prepared by reacting synthesized phosphate ester acid (PEA) with aliphatic, cycloaliphatic, and aromatic epoxy resins. The chemical structures of the above PEA and PRAs were confirmed by Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance spectroscopy (1H-NMR), and 31P-nuclear magnetic resonance spectroscopy (31P-NMR). Subsequently, transparent IFR coatings were prepared by mixing these PRAs with hexamethoxy methyl melamine resin. Transparency of the coatings was confirmed by UV–Vis–NIR spectrophotometeric studies. Fire protection property and char compressive strength were done to investigate the fire protection ability of the coatings, and the quality of the char formed was analyzed by field emission scanning electron microscope. The decomposition process of prepared fire-retardant coatings was studied by thermogravimetric analysis. Results showed that aliphatic epoxy-based transparent coating produced tough and compact char, but the char height was negligible, and aromatic epoxy-based transparent coating produced soft and fluffy char having excellent char height; however, the fluffy char reduced protection for longer duration. Cycloaliphatic epoxy-based transparent coating produced tough and compact char with good char height, thereby reducing heat transfer during combustion, and also showed superior scratch, abrasion, impact, and water resistance compared to other compositions. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of phosphate resin acid (PRA) - Preparation of coating sample
- CHARACTERIZATION : Characterization of prepared resins - Characterization of transparent coatings - Characterization of char formed
- RESULTS AND DISCUSSION : Thermogravimetric analysis (TGA) - Transparency of coating prepared using PRAs - Physicomechanical properties of transparent IR coatings - Fire resistant test - Characterization of char
- Table 1 : Composition and acid value of prepared resins
- Table 2 : Physicomechanical performance of all PRAs
- Table 3 : Elemental composition of char obtained from the EDAX analysisDOI : https://doi.org/10.1007/s11998-020-00422-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00422-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35613
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 535–547[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Fabrication of a nonionic self-emulsifiable waterborne epoxy curing agent with high cure properties Type de document : texte imprimé Auteurs : Xiaofeng Huang, Auteur ; Lei Wang, Auteur ; Yingbiao Lai, Auteur ; Laizhou Li, Auteur ; Xiang Jiang, Auteur Année de publication : 2021 Article en page(s) : p. 549-558 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Composés organiques -- Synthèse
Mesure
Revêtements -- Propriétés mécaniques
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Waterborne epoxy curing agent plays a key part in the waterborne epoxy resin coatings, directly affecting the physical and chemical properties of the coating film. Here, we present triethylene tetramine (TETA), polypropylene glycol diglycidyl ether (PPGDGE), epoxy resin E20 and phenyl glycidyl ether (PGE) as reactants to fabricate a novel nonionic self-emulsifiable waterborne epoxy curing agent for oily epoxy resin through three steps of chain extension reaction, addition reaction, and capping reaction. The curing agent achieved excellent emulsifying and curing properties under the condition that TETA reacted with PPGDGE at 65°C for 4 h with the molar ratio of 2.2:1, 40% primary amine was added with E20 at 65°C for 3 h and 125% residual primary amine was capped with PGE at 65°C for 3 h. The as-prepared waterborne epoxy curing agent was characterized by Fourier transform-infrared spectroscopy and surface tension. The cured film of emulsified oily epoxy resin (E51) prepared by the as-prepared curing agent indirectly was characterized by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry tests. The 2K waterborne epoxy coating film prepared by the as-prepared nonionic self-emulsifiable curing agent and E51 displayed better thermal property, surface appearance, flexibility, impact resistance, adhesion, and chemical corrosion resistance. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of self-emulsifiable epoxy curing agent - Emulsifying of oily epoxy resin - Measurement and characterization
- RESULTS AND DISCUSSION : Fabrication of self-emulsifiable waterborne epoxy curing agent - Properties of 2K waterborne epoxy coating film
- Scheme 1 : The three steps of chemical reaction for synthesis of the self-emulsifiable epoxy curing agent
- Table 1 : Influence of the molar ratio of TETA to PPGDGE on emulsifying and curing properties
- Table 2 : Influence of the molar ratio of E20 to the adduct on emulsifying and curing properties
- Table 3 : Influence of the molar ratio of PGE to the residual –NH2 group on emulsifying and curing properties
- Table 4 : Performance parameter of waterborne epoxy curing agent
- Table 5 : Comparison of mechanical properties and corrosion resistance between different epoxy resin filmsDOI : https://doi.org/10.1007/s11998-020-00423-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00423-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35614
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 549-558[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : On the stratification mechanism of self-stratifying epoxy–acrylic coatings Type de document : texte imprimé Auteurs : Ali Abbasian, Auteur ; S. Ekbatani, Auteur ; N. Bagherzadeh, Auteur Année de publication : 2021 Article en page(s) : p. 559-568 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylique
Enrobage (technologie)
Epaisseur -- Mesure
Marangoni, Effet
Revêtements autostratifiants
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : To shed light on the self-stratification mechanism in epoxy–acrylic coatings, 200-, 400-, and 800-micron-thick coatings were applied on glass and aluminum substrates, and their solidification behavior was studied. Some of the applied coats showed self-stratification behavior, with the thermoplastic acrylic copolymer in the top layer. In addition, experiments were performed on epoxy–acrylic solutions without hardeners to evaluate the resulting convective patterns on the solution surface, which exhibited finger-type convection. The final structure of the films had an apparent dependency on the thickness. Thicker films were usually more stratified and had a thicker stratified layer. As these observations could not support diffusion as the primary mechanism of self-stratification, convection experiments were done on epoxy and coatings solutions. The surface patterns on the solutions were studied, and the finger-type convection was observed. Based on these observations, we propose that convection may be the primary movement mechanism rather the diffusion of polymers toward the surface in the self-stratifying coats. Note de contenu : - Experimental
- Results and discussion : Self-stratification tests - Thickness effect - Effect of substrate - Convection experiments in resin solutions
- Table 1 : Specifications of curing agents
- Table 2 : Specifications of acrylic copolymersDOI : https://doi.org/10.1007/s11998-020-00424-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00424-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35615
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 559-568[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Ag NPs deposited TiO2 coating material for superhydrophobic, antimicrobial and self-cleaning surface fabrication on fabric Type de document : texte imprimé Auteurs : Hakan Görgülüer, Auteur ; Bekir Çakiroglu, Auteur ; Mahmut Özacar, Auteur Année de publication : 2021 Article en page(s) : p. 569-579 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens
Argent
Dioxyde de titane
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-nettoyant
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, a superhydrophobic titanium dioxide (TiO2)-poly(dimethylsiloxane) (PDMS)-silver nanoparticles (Ag NPs) coating was fabricated on fabrics via a simple dipping method with the versatile properties. Due to the combination of rough structure constructed by Ag NPs and the low-surface-energy of PDMS, the coated fabric exhibited superhydrophobicity. X-ray diffraction analysis verified the crystalline structure of rutile TiO2 and Ag NPs, which is suitable for the photocatalytic studies. According to the field emission scanning electron microscopy studies, surface roughness increased by improving the surface hydrophobicity upon Ag NPs deposition. The water contact angle (WCA) values were sequentially increased by incorporating TiO2, PDMS and Ag NPs into the coating composite, and the WCA value was estimated as 153° with a sliding angle of 15° for the superhydrophobic coating. Ag NPs demonstrated antibacterial activity against Escherichia coli and Staphylococcus aureus. The photocatalyst activity of TiO2 was reinforced by the formation of the Schottky barrier at the Ag NPs-TiO2 interface after the Ag NPs deposition, and TiO2 led to the photocatalytic degradation of methylene blue in solution. Furthermore, the modified textile was used to selectively separate oil–water mixtures. Thus, the coated fabric has great potential for applications in dye removal, oil separation, antibacterial and superhydrophobic coatings. Also, the coating material can be applied to other surfaces for the construction of superhydrophobic multifunctional surfaces in a low-cost way. Note de contenu : - MATERIALS AND METHODS : Reagents - Pretreatment of fabrics for coating - Preparation of 5% TiO2 NPs solution - TiO2-PDMS-Ag NPs coating material preparation and fabric coating - Photocatalytic degradation of methylene blue by coated fabric - Antibacterial study of the fabric samples - Characterization of Photoelectrocatalytic Materials - Statistical analysis
- RESULTS AND DISCUSSION : Durability and stability of the superhydrophobic fabric - Kubelka–Munk functions of materials and photo-degradation of MB by TiO2-PDMS-Ag NPs coated fabric - Antimicrobial effect of Ag NPs decorated fabrics on E. coli and S. aureus - Oil–water separation property of coated textileDOI : https://doi.org/10.1007/s11998-020-https://doi.org/10.1007/s11998-020-00412-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00412-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35616
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 569-579[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Tailored polymer coatings as corrosion inhibitor for mild steel in acid medium Type de document : texte imprimé Auteurs : Ghada M. Abd El-Hafeez, Auteur ; Mohamed M. El-Rabeie, Auteur ; Ahlam F. Gaber, Auteur ; Zeinab R. Farag, Auteur Année de publication : 2021 Article en page(s) : p. 581-590 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Caractérisation
Electropolymérisation
Poly(o-bromophénol-co-N-méthylaniline)
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(o-bromophenol-co-N-methylaniline) [poly(OBP-co-NMA)] was electropolymerized in an acidic medium at 30°C under inert atmosphere. The formed polymer was characterized using IR spectroscopy, XRD, SEM and TGA analysis. The efficiency of the deposited polymer as a corrosion protection coating on a mild steel electrode in an acidic medium was investigated. Corrosion and impedance measurements reveal that the prepared polymer has excellent passivation properties. The free energy of adsorption of the prepared polymer on the electrode surface was in the range of ≈ - 19.5 kJ mol−1, which reveals a physical adsorption of the inhibitor molecules on the metallic surface. Note de contenu : - MATERIALS AND EXPERIMENTAL PROCEDURES : Materials and solutions - lectrochemical measurements - Preparation of poly(OBP-co-NMA) - Characterization of the electrodeposited polymer
- RESULTS AND DISCUSSION : Characterization of the electrodeposited polymers - Application of poly(OBP-co-NMA) as corrosion inhibitor for mild steel in acidic medium (pH = 2)
- Table 1 : Chemical composition (wt%) of the mild steel electrode
- Table 2 : Infrared absorption bands of POBP, PNMA and poly(OBP-co-NMA)
- Table 3 : Potentiodynamic polarization parameter of mild steel after 1 h of electrode immersion in stagnant naturally aerated polymer solution in naturally aerated aqueous acidic solution pH = 2 at 25°C
- Table 4 : Equivalent circuit parameters for steel recorded after 1 h of electrode immersion in stagnant naturally aerated polymer solution at steady-state potential at 25°CDOI : https://doi.org/10.1007/s11998-020-00426-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00426-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35617
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 581-590[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of ink formulation on the inkjet printing process of Al–ZnO nanoparticles Type de document : texte imprimé Auteurs : Olga Shavdina, Auteur ; Céline Grillot, Auteur ; Fabien Giovannelli, Auteur ; Valêrie Bertagna, Auteur ; Jimmy Nicolle, Auteur ; Christine Vautrin-Ul, Auteur ; Chantal Boulmer-Leborgne, Auteur ; Nadjib Semmar, Auteur Année de publication : 2021 Article en page(s) : p. 591-600 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Encre
Formulation (Génie chimique)
Impression jet d'encre
Nanoparticules
Oxyde de zincIndex. décimale : 667.9 Revêtements et enduits Résumé : This study focuses on the inkjet printing of aluminum-doped zinc oxide (AZO) spherical and platelet nanoparticle-based nanoflakes with typical sizes ranging from 700 to 800 nm. The AZO nanoparticles were synthesized by aqueous precipitation. The preparation of the solvent-based inks was performed with the control of the viscosity, ink stability, and nanoparticle dispersion. The results showed that the viscosity for nanoparticle dispersions slightly changes (from 6.9 to 8.7 cPs) when the nanoparticles mass concentration increases from 1.8 to 10%. In order to achieve thin films of AZO nanoparticles, we optimized the printing process by real-time monitoring of drop velocity with a stroboscopic camera. This technology involves direct patterning of a functional material by tiny MEMS-jets on a flexible and rigid substrate at specific locations. The lowest concentration of AZO nanoparticles corresponding to 1.8% enables printing several times during the nanoparticle dispersions and the clogging of printhead nozzles is less pronounced. In our conditions, the optimum voltage value is 25 V to achieve a drop velocity from 7 to 9 m/s. In the case of nanospheres with 10% of AZO nanoparticles, for a large dropspace (90 μm), the individual printed droplets appear as a sequence of linear dots. When the drop spacing decreases to 75 μm, isolated drops start to overlap and merge. Further decrease in the drop spacing eliminates scalloping and leads finally to a regular and continuous layer at 55 μm. Note de contenu : - MATERIALS AND METHODS : Synthesis of AZO nanoparticles - Ink formulation - Printing process
- RESULTS AND DISCUSSION : Characterization of the ink properties - Optimization of the printing process
- Table 1 : Detailed compositions of the AZO ink formulations. Ethanol and EG are mixed with different AZO concentrations
- Table 2 : Viscosity values ν [cPs] for the different AZO loading at share rate corresponding to 30 rpmDOI : https://doi.org/10.1007/s11998-020-00427-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00427-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35618
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 591-600[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Nanoscale silica coating of porous stainless steel and its impact on water wettability Type de document : texte imprimé Auteurs : Chiemi Oka, Auteur ; Kimihide Odagiri, Auteur ; Hosei Nagano, Auteur Année de publication : 2021 Article en page(s) : p. 601-609 Note générale : Bibliogr Langues : Américain (ame) Catégories : Acier inoxydable
Caractérisation
Matériaux poreux
Métaux -- Revêtements
Mouillabilité
Orthosilicate de tétraéthyleL'orthosilicate de tétraéthyle (TEOS) est un composé chimique de formule Si(OCH2CH3)4 ou plus simplement Si(OEt)4; l'abréviation TEOS (pour tetraethylorthosilicate) est généralement utilisée dans l'industrie du sol-gel, où il est intensivement étudié. La majorité des études en sol-gel pour des sols de silices ont utilisé ce produit comme précurseur.
Le TEOS est généralement produit par alcoolyse du tétrachlorure de silicium SiCl4 dans de l'éthanol CH3CH2OH :
SiCl4 + 4 CH3CH2OH → Si(OCH2CH3)4 + 4 HCl.
Il est utilisé pour la réticulation de silicones et possède certaines applications comme précurseur du dioxyde de silicium SiO2 dans l'industrie des semi-conducteurs6 dans le cadre d'une réaction sol-gel. La propriété remarquable du TEOS est en effet de former du SiO2 par simple hydrolyse en libérant de l'éthanol CH3CH2OH :
Si(OCH2CH3)4 + 2 H2O → SiO2 + 4 CH3CH2OH.
Revêtements
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : The water wettability of porous stainless steel specimens was enhanced via a nanoscaled silica coating for application to passive two-phase heat transfer devices. A combination of porous stainless steel and water has attracted attention in the area of the heat transfer devices. However, the water wettability of stainless steel is poor, limiting the performance of the devices. In the present study, the silica coating of the specimens was conducted via a reaction of tetraethyl orthosilicate (TEOS) after pretreatment using NaOH aq. or HCl aq. Energy-dispersive X-ray spectrometry revealed that the amount of silica deposited on the surface was dependent on the pretreatment conditions and the composition of the silica-coating solutions. Measurement of porous properties indicated that the silica coating did not affect pore diameter and gas permeability since the coating was in nanoscale. Microscale contact angles were directly evaluated using an environmental SEM. The specimens showed excellent water wettability when they were covered with numerous tiny silica bumps. When the specimen was pretreated with 2 M NaOH aq. and coated in weak alkaline TEOS solution, the contact angle of the porous stainless steel decreased from 87° to 54° after silica coating. The excellent water wettability originated from the relatively smooth surface and a sufficient coverage ratio, which resulted from the moderate strength of chemical etching of the NaOH aq. and the mild silica-coating condition in the weak alkaline solution. Note de contenu : - Materials
- Silica coating
- Characterization
- Table 1 : Conditions of specimen preparation: pretreatment solutions and composition of the mixture for the silica coating
- Table 2 : Porous properties of the specimens measured by capillary flow porometryDOI : https://doi.org/10.1007/s11998-020-00417-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00417-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35619
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 601-609[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 22701 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
