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Antifouling improvement of a polyacrylonitrile membrane blended with an amphiphilic copolymer in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)
[article]
Titre : Antifouling improvement of a polyacrylonitrile membrane blended with an amphiphilic copolymer Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 93-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Caractérisation
Copolymère acrylonitrile-co-polyhydroxyéthyl méthacrylate
Copolymères
Hydrophilie
Matériaux -- Propriétés antisalissures
Membranes (technologie)
Perméation
Polyacrylonitrile
Polymères amphiphiles
Taille des poresIndex. décimale : 668.4 Plastiques, vinyles Résumé : The amphiphilic copolymer polyacrylonitrile-co-poly(hydroxyethyl methacrylate) (PAN-co-PHEMA) was readily blended with polyacrylonitrile (PAN) to fabricate a flat-sheet blending membrane through non-solvent induced phase separation (NIPS). In the membrane-forming process, the hydrophilic PHEMA chains are uniformly distributed on the surface, as revealed by the energy-dispersive X-ray tests. The sponge-like sub-layer embedded with droplet-shaped structures is formed at the cross-sections of membranes, because of the high viscosity of the casting solution. With the increase of copolymer concentration, the mean pore size of the blending membranes increases from 26.9 to 99.8 nm, leading to the increase of membrane flux from 93.6 to 205.4 l/(m2h). The incorporation of PAN-co-PHEMA copolymer endows the blending membrane with a rough surface microstructure and enhanced hydrophilicity. The rejection ratio of membranes for emulsified pump oil reaches 99.9%, indicating a prominent separation performance. In the cycle permeation experiments, the flux recovery ratio of the blending membranes is as high as 99.6%, which is much higher than those of PAN membrane. The irreversible fouling of blending membranes induced by oil adsorption is alleviated, and converted into reversible fouling, owing to the reduction of the adhesion force between foulant and membrane surface. These results suggest that the anti-fouling property of PAN membranes has been dramatically strengthened via the addition of PAN-co-PHEMA copolymer. Note de contenu : - EXPERIMENTAL : Materials - Membrane preparation - Membrane characterization - Permation experiments
- RESULTS AND DISCUSSION : Chemical structure and composition of the blending membranes - Morphology of the membranes - Hydrophilicity of the membranes - Adhesion force between foulant and membrane surface - Permeation and antifouling properties
- Table 1 : Compositions and viscosities of casting solutions
- Table 2 : Elemental concentration of the membrane surfaces
- Table 3 : Mean roughness parameter (Ra) and mean pore size (dm) of the membranesDOI : https://doi.org/10.1515/ipp-2021-4175 En ligne : https://drive.google.com/file/d/1gHIUnshbRcjPcKdHhmL5HqHm_wBDgAWG/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38444
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 93-105[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23736 - Périodique Bibliothèque principale Documentaires Disponible Bio-inspired fabrication of superhydrophilic and underwater superoleophobic alumina membranes for highly efficient oil/water separation / Wenjin Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
[article]
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
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Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible Building brighter façades / Lenine de Sousa Gomes in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2017)
[article]
Titre : Building brighter façades : Composite dispersion binder reduces fading and dirt pick-up Type de document : texte imprimé Auteurs : Lenine de Sousa Gomes, Auteur Année de publication : 2017 Article en page(s) : p. 28-33 Langues : Anglais (eng) Catégories : Couleurs -- Stabilité
Liants
Matériaux -- Propriétés antisalissures
Particules fines
Pigments -- Stabilité
Revêtements -- Additifs:Peinture -- Additifs
Revêtements en bâtiment:Peinture en bâtiment
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 : A new form of hybrid binder has been developed in which the silica particles are more homogeneously distributed than in previous technologies. The binder reduces dirt pick-up and can also improve colour retention on exposure. Leaching of soluble components, giving rise to efflorescence and 'snail trails', is also reduced. Note de contenu : - Colour lends character to façades - while it lasts
- Hybrid binder has more homogeneous silica distribution
- Exposure test shows greatly reduced dirt pick-up
- Pigment stability can be improved
- 'Snail trails' due to leaching are reduced
- NMR analysis confirms leaching is reducedEn ligne : https://drive.google.com/file/d/1Mdq-00vFYskEOdPjqMUBP4DQRpImle17/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27543
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 1 (01/2017) . - p. 28-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18601 - Périodique Bibliothèque principale Documentaires Disponible Cerium oxide nanozymes as biocide-free antifouling finish for outdoor fabrics / Thomas Mayer-Gall in TECHNICAL TEXTILES, Vol. 65, N° 5 (12/2022)
[article]
Titre : Cerium oxide nanozymes as biocide-free antifouling finish for outdoor fabrics Type de document : texte imprimé Auteurs : Thomas Mayer-Gall, Auteur ; Tori Engels, Auteur ; Jochen S. Gutmann, Auteur ; Felix Pfitzner, Auteur ; Eva Pütz, Auteur ; Wolfgang Tremel, Auteur ; Athanasios Gazanis, Auteur ; Ralf Heermann, Auteur ; Guillaume Delaittre, Auteur Année de publication : 2022 Article en page(s) : p. 277-279 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Applications extérieures
Enzymes artificiellesUne enzyme artificielle est une molécule synthétique relativement petite créée pour imiter le site actif d´une enzyme naturelle. Elle est bâtie à partir d´une molécule hote, responsable de la liaison sélective avec le substrat, et à laquelle on ajoute des groupes fonctionnels pour obtenir une activité catalytique.
Initialement, les molécules hôtes utilisées étaient essentiellement des cyclodextrines, des éthers couronnes ou des calixarènes. Même si les systèmes artificiels sont capables d´accélérer une réaction par un facteur 1000, leurs performances restent encore très en dessous des performances réalisées par les enzymes naturelles (x10 -6). Depuis, d´autres approches ont suivi telles que l´utilisation de peptides ou d´anticorps (abzymes). (Wikipedia)
Fibres textiles synthétiques
Liants
Matériaux -- Propriétés antisalissures
Nanoparticules
Oxyde de cérium
Polyacrylates
Polyéthylène téréphtalate
Revêtements anti-adhésion
Sol-gel, Procédé
Surfaces antimicrobiennesIndex. décimale : 677.47 Non cellulosiques : Nylon, acryliques, polyesters, vinyles Résumé : The undesirable attachment of organisms to the surfaces of outdoor fabrics causes biofouling which could be a precursor of many problems including biocorrosion and material failure. In the IGF project No. 19585 N, novel antifouling finishes for outdoor textiles, such as sails and awnings, were developed on the basis of cerium oxide nanomaterials (nanoceria). The project was carried out by the German Research Foundation (IGF), Cerium oxide nanorods or nanoparticles were immobilized onto the surface of textiles, which have the ability to generate messenger molecules of micro-organisms due to their haloperoxidase activity that induce antibacterial efficiency and inhibit the biofilm formation. Note de contenu : - Fig. 1 : Antimicrobial surfaces based on biocidal and antiadhesive modifications ; in the textile sector, mainly biocidal finishes have been developed so far
- Fig. 2 : Haloperoxidase reaction of the cerium oxide nanozymes
- Fig. 3 : Catalytic activity of a cerium oxide nanozyme finished on PET fabrics using an sol-gel binder at different binder concentration and nanoparticle content of the finish solution
- Fig. 4 : Time course of the catalytic activity of the nanozymes using in a commercial acrylate binder and PET
- Fig. 5 : Biofilm formation on textiles equipped with an dwithout nano-enzymesEn ligne : https://drive.google.com/file/d/1LWssEtLemZL5fe-mp8Fysxfr-VUExLrT/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38752
in TECHNICAL TEXTILES > Vol. 65, N° 5 (12/2022) . - p. 277-279[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23779 - Périodique Bibliothèque principale Documentaires Disponible Increased hydrophilicity and anti-fouling effect of orthokeratology lenses coated with NVP and PEGMA by plasma-enhanced chemical vapor deposition / Tsung-Jen Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
[article]
Titre : Increased hydrophilicity and anti-fouling effect of orthokeratology lenses coated with NVP and PEGMA by plasma-enhanced chemical vapor deposition Type de document : texte imprimé Auteurs : Tsung-Jen Wang, Auteur ; Wen-Pin Lin, Auteur ; Siao-Pei Guo, Auteur Année de publication : 2024 Article en page(s) : p. 737-745 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt chimique en phase vapeur
Hydrophilie
Lentilles (optique)
Matériaux -- Propriétés antisalissures
Polyéthylène greffé anhydride maléique
Revêtements organiques
Technique des plasmasIndex. décimale : 667.9 Revêtements et enduits Résumé : Plasma-enhanced chemical vapor deposition (PECVD) is a vacuum plasma treatment procedure for the deposition of thin film on a substance, which was first used on orthokeratology lenses (ortho-k lenses) in order to coat polymerized 1-vinyl-2-pyrrolidinone (NVP) and poly(ethylene glycol) methacrylate (PEGMA) on the lenses. First, the surface of ortho-k lenses was pretreated with electrons, radicals, and peroxides for 9 min, under 9 sccm Ar, 36 sccm O2, and 120 W of applied radio frequency (RF) power. NVP and PEGMA were deposited on the surface of lenses through the heating of NVP to 50°C and PEGMA to 43°C. The chamber pressure was maintained at 300 mTorr, with 40 W of applied RF power, 12 sccm Ar, and an 8-cm treatment distance. Obviously decreased water contact angle of NVP/PEGMA-coated lenses exhibited excellent hydrophilicity, which lasted for up to 90 days, and significant lower protein adsorption was observed on NVP/PEGMA-coated lenses. Besides, the MTT assay revealed the great biocompatibility of the coated lenses. Therefore, our results showed that PECVD can be used to prepare NVP/PEGMA-coated ortho-k lenses with excellent long-lasting hydrophilicity and anti-fouling effect. Note de contenu : - MATERIALS AND METHODS : Materials - Self-conducted chamber for PECDV treatment - Hydrophilicity of NVP/PEGMA-coated lenses - Surface characteristics - Light transmittance - Protein adsorption and antibacterial properties - Cytotoxicity
- RESULTS AND DISCUSSION : Hydrophilicity and stability of NVP/PEGMA-coated ortho-k lenses - Surface characteristics - Light transmittance - Protein adsorption and antibacterial properties - CytotoxicityDOI : https://doi.org/10.1007/s11998-023-0000853-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00853-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40788
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 737-745[article]PermalinkPAN ultrafiltration membranes grafted with natural amino acids for improving antifouling property / Yufang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)
PermalinkPreparing self-cleaning superhydrophobic fiber@POSS garment fabric by UV-curing-induced high surface roughness / Ping Guo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)
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