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Doping for a better cleaning agent / Stephan Peter Bloess in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4528 (09/2008)
[article]
Titre : Doping for a better cleaning agent Type de document : texte imprimé Auteurs : Stephan Peter Bloess, Auteur ; Peter Jakob Gross, Auteur Année de publication : 2008 Article en page(s) : p. 36-45 Langues : Anglais (eng) Catégories : Dépolluants
Dioxyde de titane
Photocatalyse
Photodétérioration
Pollution -- Lutte contreIndex. décimale : 667.9 Revêtements et enduits Résumé : The author describe improving the decomposition of pollutants and increasing the dirt-repelling properties of materials with doped titanium dioxide.
Titanium dioxide is by far the most commonly produced white pigment. In addition to its extraordinary hiding power and excellent whitening properties, this transition metal oxide features other remarkable capabilities. Photochemical processes at the surface of titanium dioxide allow the decomposition of organic substances (photocatalysis) and can prevent drop formation on surfaces, as well as drastically facilitate the run-off of liquids from surfaces (photohydrophilicity). The crucial element in these phenomena is light energy, which aids titanium dioxide in providing radicals for the decomposition of unwanted substances, and in influencing the wetting properties of surfaces. While until recently, only the UV portion of sunlight could be used, with the proper doping of titanium dioxide a considerable portion of the visible light can now be also explored. This achievement has significantly widened the range of applications in which titanium dioxide photocatalysts can deploy their effect.Note de contenu : - Discovery and industial exploration
- Worldwide consumption and applications
- Decomposition of pollutants through photocatalys
- Modified titanium dioxide for improved utilisation of the light spectrum
- Photocatalytic decomposition even in diffuse lightEn ligne : https://drive.google.com/file/d/1Lxwi3Eyk06mJSBGiacO79unl6eqXaNEq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27617
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4528 (09/2008) . - p. 36-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010736 - Périodique Bibliothèque principale Documentaires Disponible Effect of inorganic anions on the photocatalytic decolorisation of an azo dye in the aqueous phase by cadmium sulphide/polymer nanocomposite films under visible light irradiation / Ru Jiang in COLORATION TECHNOLOGY, Vol. 127, N° 6 (2011)
[article]
Titre : Effect of inorganic anions on the photocatalytic decolorisation of an azo dye in the aqueous phase by cadmium sulphide/polymer nanocomposite films under visible light irradiation Type de document : texte imprimé Auteurs : Ru Jiang, Auteur ; Yujiang Guan, Auteur ; Huayue Zhu, Auteur ; Yongqian Fu, Auteur Année de publication : 2011 Article en page(s) : p. 426-433 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anions
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà , chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à -dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
Colorants azoïques
Décoloration
Irradiation
Matériaux hybrides
Orange méthylique
Photocatalyse
Sulfure de cadmiumIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Batch experiments were carried out to study the effects of various inorganic anions on the photocatalytic decolorisation of an azo dye (CI Methyl Orange 13025) in the aqueous phase in the presence of cadmium sulphide/polymer nanocomposite films under visible light irradiation. When anion concentrations were low (0.001 m), the inhibition effect on the photocatalytic decolorisation of CI Methyl Orange 13025 caused by these anions was ranked as inline image. The presence of both inline image and inline image baffled the breakage of the benzene ring in the chemical structure of CI Methyl Orange 13025, while the presence of inline image was of benefit to the degradation of the benzene ring. Adsorption experiments indicated that inorganic anions affected the decolorisation of CI Methyl Orange 13025 by competitive adsorption onto the surface of the photocatalyst. The photocatalytic decolorisation of CI Methyl Orange 13025 followed the pseudo-first-order kinetic reaction model well in all experimental cases. Note de contenu : - EXPERIMENTAL : Reagents and chemicals - Preparation and characterisation of cadmium sulphide/polymer (chitosan) nanocomposite films - Photocatalytic decolorisation of CI methyl orange 13025
- RESULTS AND DISCUSSION : Characterisation of cadmium sulphide/polymer nanocomposite films - Effect of different anions on the photocatalytic decolorisation of CI methyl orange 13025 - Effect of sulphate anions - Effect of phosphate anions - Effect of carbonate anions - Effect of nitrate anions - Comparison of the effect of different anions - Comparison of UV-vis spectraDOI : 10.1111/j.1478-4408.2011.00341.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12664
in COLORATION TECHNOLOGY > Vol. 127, N° 6 (2011) . - p. 426-433[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13476 - Périodique Bibliothèque principale Documentaires Disponible Effect of sputtering parameters on the self-cleaning properties of amorphous titanium dioxide thin films in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : Effect of sputtering parameters on the self-cleaning properties of amorphous titanium dioxide thin films Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces
Dioxyde de titane
Hydrophilie
Magnétron
Matériaux amorphes
Photocatalyse
Pulvérisation
Revêtement auto-nettoyantIndex. décimale : 667.9 Revêtements et enduits Résumé : The aim of this work was to assess the effect of the direct current magnetron sputtering parameters on the photocatalytic activity and photoinduced wettability of amorphous TiO2 films. TiO2 films were deposited on glass using the direct current magnetron sputtering technique, without heating, at different total working pressures. Qualitative analysis using in situ X-ray photoelectron spectroscopy confirmed the TiO2 stoichiometry of the deposited films. Surface structure was studied as a function of working pressure using scanning electron microscopy. The hydrophilicity of the TiO2 surfaces was investigated macroscopically using measurements of the water contact angle. A threshold working pressure was observed, with a strong dependence on the film thickness. A super hydrophilic surface was observed after less than 1 h of UV irradiation. The photocatalytic activity of the films was evaluated under UV light through the degradation of methylene blue (λmax≈660nm). The effect of UV irradiation on the photocatalytic activity was rapid, strong, and dependent on film thickness and total working pressure. Fifty percent of organic compounds were photodegraded by films with a thickness of 60 nm deposited at 10 mTorr. Note de contenu : - EXPERIMENTAL DETAILS : Sample preparation - Contact angle measurements - Photocatalytic tests - X-ray photoelectron spectroscopic analysis - Characterization
- RESULTS AND DISCUSSION : TiO2 film deposition - Structural characterization - Photoinduced superhydrophilicity - Photocatalytic activityDOI : 10.1007/s11998-017-9928-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9928-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29654
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Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) / Ana Sofia Silva in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) Type de document : texte imprimé Auteurs : Ana Sofia Silva, Auteur ; Giovanni Borsoi, Auteur ; João LuÃs Parracha, Auteur ; Inês Flores-Colen, Auteur ; Rosario Veiga, Auteur ; Paulina Faria, Auteur ; Amélia DionÃsio, Auteur Année de publication : 2022 Article en page(s) : p. 1437-1448 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures
Dioxyde de titane
Isolation thermique
Nanoparticules
Photocatalyse
Revêtement auto-nettoyant:Peinture auto-nettoyante
Revêtements -- Additifs:Peinture -- Additifs
Revêtements protecteurs
Tests d'efficacitéIndex. décimale : 667.9 Revêtements et enduits Résumé : External thermal insulation composite systems (ETICS) have been extensively applied on building façades with the aim of implementing the thermal and aesthetical properties of the building envelope. However, the formation of stains and deposition of particulate matter is often observed in the surface of these systems. The use of multifunctional products with self-cleaning properties can reduce surface anomalies and thus enhance the durability of ETICS. This study aims at evaluating the effectiveness of three protective coatings with self-cleaning additives (i.e., TiO2 nanoparticles), when applied on the surface of ETICS. Three different stains (rhodamine, methylene blue and silver paint aerosol) were applied on the ETICS finishing coat, evaluating the removal of these stains after exposure to natural (solar radiation) light source. The surface properties (compactness, hardness, roughness, gloss, and color) of the ETICS were evaluated prior and after sun exposure. Results showed that the application of the three products lead to a modification of the surface properties (compactness, hardness, gloss, roughness) of the ETICS specimens, and sensibly enhance the self-cleaning, hydrophobic and aesthetical properties of the ETICS. Note de contenu : - MATERIALS AND METHODS : ETICS specimens - Protective coatings - Application protocol - Surface properties - Morphological and microstructural characterization - Self-cleaning test
- RESULTS : Surface properties - Morphological and microstructural analysis - Self-cleaning test
- Table 1 : Physical features and amount of product used in the application of the protective coatings
- Table 2 : Mean values and standard deviations of the ultrasonic propagation speed (Sp), surface hardness, surface gloss, surface roughness, and contact angle (θ) of the untreated (P0) and treated (P1, P2, P3) ETICS specimensDOI : https://doi.org/10.1007/s11998-022-00617-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00617-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38281
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of self-cleaning properties of leather surface with TiO2 nanoparticles / Véronica Bouça in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)
[article]
Titre : Evaluation of self-cleaning properties of leather surface with TiO2 nanoparticles Type de document : texte imprimé Auteurs : Véronica Bouça, Auteur ; Diana Sousa, Auteur ; Mariana Ornelas Cardoso, Auteur ; David Conceçà o, Auteur ; Gabriela Queiros, Auteur ; Eduardo F. Marques, Auteur ; Joaquim Gaià o, Auteur ; Raquel Mourà o, Auteur ; Ana Catarina Lopes, Auteur ; Filipe Crispim, Auteur ; Leal Neto, Auteur ; Lorena Coelho, Auteur Année de publication : 2020 Article en page(s) : p. 83-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Auto-nettoyage
Caractérisation
Dioxyde de silicium
Dioxyde de titane
Nanoparticules
NubuckLe nubuck1 est une croute de daim ou de cuir. Sa particularité vient du fait qu'il a subi un traitement particulier. En effet, sa surface a été meulée ou grattée au papier de verre très fin. C'est pourquoi il revêt cette apparence veloutée et sa douceur au toucher. Le ponçage de la fleur lui donne un aspect qui diffère largement du suède. Comme seule la surface externe du cuir est touchée par le traitement, il possède une meilleure résistance et conserve toute la finesse de son grain.
Il est utilisé particulièrement dans l'industrie de l'ameublement pour la fabrication des fauteuils et canapés ainsi que par l'industrie de la chaussure. Il est souvent assez coûteux, car c'est une matière qui a une certaine noblesse. Son nom provient probablement de la langue anglaise, et de new buck qui signifie nouveau daim.
PhotocatalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Titanium dioxide (Ti02) is well known for its photocatalytic capabilities, and its applications coverl different areas, such as wastewater treatment, sunscreen and ultraviolet (UV) blocking, among others. Its application as a photocatalytic additive for self-cleaning properties has been reported with different substrates, resulting in stain degradation. As such, the goal of this work was to functionalise two types of nubuck leather, conferring on them self-cleaning properties. For this purpose, two photocatalytic materials were tested: a commercial TiO2 (Degussa P25 Ti02) and Si02@Ti02 nanoparticles, which were applied onto leather surfaces by a spray coating technique. The hydrophilic behaviour of these two types of nubuck leather was determined by contact angle (CA) measurement, using the sessile drop technique. The finished samples of nubuck leather were characterized by measuring their diffuse reflectance. The self-cleaning properties of finished nubuck leather samples were evaluated through their ability to photodegrade an organic stain, rhodamine-B dye. The P25 TiO2 and Si02@TiO2 particles did not provide self-cleaning properties for the two types of nubuck leather, indicating the need for more in-depth research on the use of these particles for self-cleaning purposes. Note de contenu : - MATERIALS AND METHODS
- RESULTS AND DISCUSSION : Characterisation of leather surface - Self-cleaning analysis of leather surface
- Table 1 : Brown leather surface samples (control, P25 TiO2 coating and SiO2@TiO2) with RhB stain before and after 20 hours of UV radiation exposure
- Table 2 : White leather surface samples (control, P25 TiO2 coating and SiO2]TiO2) with RhB stain before and after 20 hours of UV radiation exposureEn ligne : https://drive.google.com/file/d/1xzAfOK9UoDx6onxN7EQAUeQhuUhU1-Gl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33913
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 2 (03-04/2020) . - p. 83-89[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21654 - Périodique Bibliothèque principale Documentaires Disponible Exploring marine applications for heat-reflective coatings / Rob Portsmouth in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 5 (05/2013)
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PermalinkFighting germs with solar energy / Teresa Huppmann in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 5 (05/2014)
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PermalinkInfluence of pH, concentration of sodium lactate as an additive and ultrasonic treatment on synthesis of zinc phosphate white pigments / Hiroaki Onoda in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 36, N° 4 (08/2014)
PermalinkInternational Symposium on Advanced Fiber/Textile Science and Technology (ISAF) 2010 in Fukui / Congrès: International Symposium on Advanced Fiber/Textile Science and Technology (ISAF) (University of Fukui, Fukui, Japan) / 2010
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PermalinkInvestigation into photocatalytic decolorisation of CI Reactive Black 5 using titanium dioxide nanopowder / Fiona Chai Foong Low in COLORATION TECHNOLOGY, Vol. 128, N° 1 (2012)
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