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The preparation of superhydrophobic photocatalytic fluorosilicone/SiO2–TiO2 coating and its self-cleaning performance / Lijun Zong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)
[article]
Titre : The preparation of superhydrophobic photocatalytic fluorosilicone/SiO2–TiO2 coating and its self-cleaning performance Type de document : texte imprimé Auteurs : Lijun Zong, Auteur ; Yaping Wu, Auteur ; Xingeng Li, Auteur ; Bo Jiang, Auteur Année de publication : 2021 Article en page(s) : p. 1245-1259 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dioxyde de silicium
Dioxyde de titane
Fluorosilicones
Hydrophobie
Photocatalyse
Revêtement auto-nettoyant
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Nanographite-zinc particles in various ratios were synthesized by high energy ball milling and dispersed in epoxy based aero grade resins for studying their microwaves absorption in the lower frequency band of 2–9 GHz using a coaxial waveguide measurement system. Morphological characterizations of the synthesized particles showed that shuttle shaped zinc is well embedded on the exfoliated nanographite particles without any agglomeration. The higher interfacial polarization of both the graphite and zinc particles contributes to the excellent electrical conductivity and hence refers it as an ideal microwave absorber in defense applications. The paint with 20% (w/v) loading of nanographite-zinc (1:1 ratio) particles is proficient in providing microwave absorption of − 18.06 dB at 8.19 GHz with a coating thickness of 1.43 mm. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Sample characterization
- RESULTS AND DISCUSSION : Effects of TiO2 addition amount on the wettability change - Effects of SiO2 addition amount on the wettability change - Photocatalytic degradation performances - Morphology characteristic analysis and the self-cleaning performance
- Table 1 : The surface roughness, microstructure, hydrophilic transition under UV, and photocatalytic performance of prepared coatings
- Table 2 : The pollution performance and hydrophobicity recovery of three typical coatings with different surface characteristicsDOI : https://doi.org/10.1007/s11998-021-00485-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00485-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36429
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Code-barres Cote Support Localisation Section Disponibilité 22991 - Périodique Bibliothèque principale Documentaires Disponible The reduction in ice adhesion using controlled topography superhydrophobic coatings / Yujie Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
[article]
Titre : The reduction in ice adhesion using controlled topography superhydrophobic coatings Type de document : texte imprimé Auteurs : Yujie Wang, Auteur ; Jinde Zhang, Auteur ; Hanna Dodiuk, Auteur ; Samuel Kenig, Auteur ; Jo Ann Ratto, Auteur ; Carol Barry, Auteur ; Joey Mead, Auteur Année de publication : 2023 Article en page(s) : p. 469-483 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Caractérisation
Epoxydes
Fluoroalkylsilane
Hydrophobie
Interfaces solide-liquide
Liants
Mouillage (chimie des surfaces)
Nanoparticules
Revêtements organiques
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.
TopographieIndex. décimale : 667.9 Revêtements et enduits Résumé : Since ice formation on surfaces at subzero temperatures leads to accidents, increased equipment maintenance costs, and reduced performance, multiple strategies, including superhydrophobic surfaces and coatings, have been explored as means to reduce ice adhesion to solid surfaces. Previous work has correlated the effect of topography of regularly patterned superhydrophobic surfaces with ice adhesion. This work, however, investigated the effect of filtered topography on ice adhesion for random superhydrophobic surfaces. The ice adhesion behavior of superhydrophobic composite coatings, prepared from a mixture of silica nanoparticles and polymer binder and sprayed on glass slides, was determined using a shear strength measurement. The ice adhesion significantly decreased with an increase in particle content up to 40 wt.%, after which the ice adhesion became nearly constant. The present study focuses on the use of a novel filtering method for coating topography evaluation which isolated the asperities contributing to the interface from the roughness profile in the superhydrophobic coating. It showed that the ice adhesion correlated with the filtered asperity height and spacing for these random hydrophobic surfaces. Higher particle contents led to larger asperity distances, smaller solid fractions, and lower ice adhesion. The results and conclusions are based on a static ice adhesion test using still water. In this work, it is demonstrated that ice adhesion can be predicted based on the solid–water–air interface, a correlation that could guide future superhydrophobic coating fabrication to create surfaces with greater reduction in ice adhesion. Note de contenu : - Materials
- Preparation of SHP coatings
- Surface wetting characterization
- Visualization of solid-water interface
- Ice shear adhesion strength measurement
- Topography characterization
- Table 1 : Composition of SHP coatings with different particle contents
- Table 2 : Measured topographical parameters of defined asperities and particle content
- Table 3 : Definition of design parameters in this work
- Table 4 : Design parameters for the SHP surfacesDOI : https://doi.org/10.1007/s11998-022-00682-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00682-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39292
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Code-barres Cote Support Localisation Section Disponibilité 24056 - Périodique Bibliothèque principale Documentaires Disponible The study of the possibility of silicon dioxide coatings modified by (3-aminopropyl)triethoxysilane as protective materials for stone / Dan Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : The study of the possibility of silicon dioxide coatings modified by (3-aminopropyl)triethoxysilane as protective materials for stone Type de document : texte imprimé Auteurs : Dan Li, Auteur ; Feigao Xu, Auteur Année de publication : 2020 Article en page(s) : p. 563-572 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aminopropyltriethoxysilane
Calcaire
Caractérisation
Enrobage (technologie)
Essais de pelage
Formulation (Génie chimique)
Hydrophobie
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.
Oxyde de silicium
Pierre
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.
Réaction de couplage
Réticulants
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Silicon dioxide coatings modified by (3-aminopropyl)triethoxysilane (ATS) were studied to test their potential use as materials for stone protection. The synthetic route is simple and environmentally friendly due to the lack of volatile organic components. These materials are simply obtained by mixing tetraethylorthosilicate (TEOS), ATS, and OH-terminal polydimethylsiloxane (PDMS-OH). The ATS acts as a curing catalyst and coupling agent. The formulations can be directly applied onto stone substrates, particularly the external stone of buildings. Thus, the goal of an application of silicon dioxide modified by ATS is to restore and to protect building substrates. In the hybrid materials, PDMS acts to form bridges linking the silica particles. Finally, the effectiveness of these products as a stone consolidant and coating was assessed by multiple indicators, including the mechanical resistance, peeling performance, water uptake by capillarity, and contact angle. Note de contenu : - MATERIALS AND METHODS : Reagents - Characterization methods - Preparation of ATS-modified silicone dioxide - Consolidation of simulating the weathered limestone - Peeling performance tests - Effectiveness as a hydrophobic coating - Evaluation of the negative effects induced by the treatments
- RESULTS AND DISCUSSION : Cure characterization - Effectiveness of N formulations as stone consolidants - Effectiveness as a hydrophobic coatingDOI : https://doi.org/10.1007/s11998-019-00307-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00307-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34004
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible The use of comb-type copolymers to sustain the surface bactericidal effect of highly water-soluble cationic biocides / J. J. Gerrard in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B2 (05/2005)
[article]
Titre : The use of comb-type copolymers to sustain the surface bactericidal effect of highly water-soluble cationic biocides Type de document : texte imprimé Auteurs : J. J. Gerrard, Auteur ; J. Moore, Auteur ; J. A. Annable, Auteur Année de publication : 2005 Article en page(s) : p. 83-91 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens
Chimie analytique
Copolymères
Formulation (Génie chimique)
Hydrophobie
Polyacryliques
Polyaddition
Polymères ramifiés
Spectroscopie ultravioletteIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of free radical comb-type acrylic copolymers was prepared in a solution incorporating charged and/or neutral stabilising species on the backbone. The polymer solutions were formulated with cationic biocides to give physically stable formulations with a long shelf life. Furthermore, through the control of polymer architecture of both the side-chain and the backbone, hydrophobicity, a controlled release of a biocide could be achieved. This technology has resulted in the design of temporary coatings demonstrating a sustained surface disinfecting effect. In laboratory trials, coated surfaces with polymeric/biocidal formulations continued to show a disinfection effect after several washes. Note de contenu : - EXPERIMENTAL : Preparation of comb copolymers - Synthesis of comb copolymers - Formulation of comb copolymers with bactericide PHMB
- TEST PROTOCOLS : Acid Red 52 dye test (test protocol 1) - Preparation of comb copolymers and PHMB formulations (test protocol 2) - Coating for formulations (test protocol 3) - Release of PHMB from a dried coated formulation (test protocol 4) - Calibration of PHMB using Lambda 900 UV/VIS/NIR spectrometer (test protocol 5) - Calculation of minimum inhibitory concentrations (test protocol 6) - Residual bactericidal activity (test protocol 7) - Repeat inoculation test (test protocol 8à
- RESULTS AND DISCUSSION : Release of PHMB from formulationsusing test protocol N° 4 - Optimisation of PHMB loading - Residual bactericidal activity using test protocol N° 7DOI : 10.1007/BF02699538 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699538.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5420
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Code-barres Cote Support Localisation Section Disponibilité 001966 - Périodique Bibliothèque principale Documentaires Disponible 002343 - Périodique Bibliothèque principale Documentaires Disponible Thermoplastic polyurethanes containing hydrophobic polyphenylene ether polyols / Edward N. Peters in COATINGS WORLD, Vol. 23, N° 3 (03/2018)
[article]
Titre : Thermoplastic polyurethanes containing hydrophobic polyphenylene ether polyols Type de document : texte imprimé Auteurs : Edward N. Peters, Auteur Année de publication : 2018 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ether de polyphénylène
Formulation (Génie chimique)
Hydrophobie
Polyols
Polyuréthanes
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes have extensive structure/property diversity. They can be synthesized with a number of materials to modify and tailor their performance. There is interest in broadening the performance profile of Thermoplastic Polyurethanes (TPUs) with increased thermal stability and greater hydrophobicity. PPE telechelic macromonomers (PPE-M) are unique hydrophobic polyols which have an impressive track record in broadly enhancing the performance of epoxy resins, cyanate esters, and thermoplastics. Seeking to meet this demand for enhanced TPU performance, PPE-M were used to synthesize amphiphilic polyurethane block copolymers. In this paper, the performance properties of TPUs produced using these novel hydrophobic polyols are presented and their properties compared against reference TPUs. It was found that TPUs derived from these novel polyols maintain exceptional physical and mechanical performance while also exhibiting improved resistance to moisture and thermo-oxidative degradation. In addition, abrasion, tear, electric insulating properties, and chemical resistance were improved. Note de contenu : - EXPERIMENTAL : Materials - Polyol blend preparation - Kinetic data - Formulations - Polymerization
- RESULTS AND DISCUSSION : EO-PO - TPUs PTMG TPUs
- Fig. 1 : PPE chemical structure
- Fig. 2 : PPE-M chemical structure
- Fig. 3 : Homogeneous PPE-M blends with PTMG and EO-PO
- Fig. 4 : Reaction rates of PPE-M with 4,4’-MDI
- Fig. 5 : Moisture uptake at 100% RH
- Fig. 6 : Water absorption after immersion
- Fig. 7 : Contact angles of PPE-M/EO-PO TPUs
- Fig. 8 : Wear resistance
- Fig. 9 : Tear resistance
- Fig. 10 : Elongation at 50 to 75 °C
- Fig. 11 : Effect of PPE-M on heat aging at 100 °C
- Fig. 12 : Dielectric constant
- Fig. 13 : Loss tangent
- Fig. 14 : Carbonaceous residue (char)
- Fig. 15 : Moisture uptake at 100% RH after seven days @ 50 °C
- Fig. 16 : VICAT softening temperatures
- Fig. 17 : Elongation at RT and 50 °C
- Fig. 18 : ensile strength at RT and 50 °C
- Fig. 19 : Effect of PPE-M on heat aging at 100 °C
- Table 1 : Formulation of EO-PO-based TPUs
- Table 2 : Formulation of PTMG-based TPUs
- Table 3 : Weight increase (%) after three days of chemical immersionEn ligne : https://www.coatingsworld.com/issues/2018-03-01/view_features/thermoplastic-poly [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32528
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