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Deposition of Au and ZnO nanoparticles from concentrated colloidal dispersions in ethanol on glass, polyethylene terephthalate, polystyrene and silicone substrates for manufacturing simple and combined coatings / Vladimir Tatarchuk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Deposition of Au and ZnO nanoparticles from concentrated colloidal dispersions in ethanol on glass, polyethylene terephthalate, polystyrene and silicone substrates for manufacturing simple and combined coatings Type de document : texte imprimé Auteurs : Vladimir Tatarchuk, Auteur ; Irina Druzhinina, Auteur ; Evgeny Maksimovskii, Auteur ; Sergei Gromilov, Auteur Année de publication : 2021 Article en page(s) : p. 205-228 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colloides
Composites
Dispersions et suspensions
Nanoparticules
Or
Oxyde de zinc
Polyéthylène téréphtalate
Polystyrène
Revêtements
Revêtements multicouches
SemiconducteursIndex. décimale : 667.9 Revêtements et enduits Résumé : The deposition of coatings of Au and ZnO nanoparticles (NPs) on glass, semiconductor silicon, polyethylene terephthalate, and polystyrene substrates was studied. Deposition was carried out using relatively concentrated dispersions of particles in ethanol (approximately 5–10 mM Au, ZnO), which showed limited time resistance to coagulation and sedimentation, but returned to their original dispersed state by ultrasonic treatment before each cycle of deposition of NPs. The NPs of Au and ZnO were stabilized by abietate and acetate ions, respectively. Simple coatings from Au or ZnO NPs and a combined coating from a mixture of Au and ZnO NPs, as well as two-layer combined coatings with alternating layers of Au/ZnO and ZnO/Au NPs, were obtained by drop casting and the proposed method of deposition from the capillary layer of the dispersion with the use of a linker. The formation of coatings on transparent substrates was studied by means of UV–Vis spectroscopy. Coatings were characterized by SEM, EDX, XRD, PL, UV–Vis and surface resistance methods. The effect of heat treatment on coatings characteristics was tested. Note de contenu : - EXPERIMENTAL : Materials - Syntheses - Substrate treatment - Coating deposition methods - Study methods
- RESULTS AND DISCUSSION : Coagulation/sedimentation and regeneration of dispersions - Formation of coatings by DCLD - Formation of coatings by DC - Morphology and composition - Optical and electrical characteristics
- Table 1 : Samples and codes
- Table 2 : Parameters of linear dependences during the formation of two-sided coatings by the DLCD method
- Table 3 : Parameters of linear dependences during the formation of one-sided two-layer coatings by the DC method
- Table 4 : The effect of heat treatment on the size of gold crystallites and on the surface resistance of coatings
- Table 5 : EDX results for coatings on glass before and after heating at 380°CDOI : https://doi.org/10.1007/s11998-020-00397-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00397-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35364
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Dielectric studies of epoxy/polyester powder coatings containing titanium dioxide, silica, and zinc oxide pigments / Emile C. Trottier in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 5 (09/2012)
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Titre : Dielectric studies of epoxy/polyester powder coatings containing titanium dioxide, silica, and zinc oxide pigments Type de document : texte imprimé Auteurs : Emile C. Trottier, Auteur ; Stanley Affrossman, Auteur ; Richard A. Pethrick, Auteur Année de publication : 2012 Article en page(s) : p. 525-539 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diélectriques
Dioxyde de titane
Epoxydes
Oxyde de zinc
Polyesters
Revêtements poudre:Peinture poudre
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 : Dielectric measurements are reported covering a frequency range from 10?3 to 105 Hz and a temperature range from ~355 to 410 K for a pigmented epoxy/polyester resin powder coating system. A large low frequency ohmic conduction was observed in all these systems and the electrical modulus representation was used to aid analysis. A space charge relaxation indicative of heterogeneity in the matrix was observed in the pure resin and the pigmented coatings. In the pure resin, the heterogeneity is associated with nanoscale phase separation. A study with the resin modified with Modaflow, an ester copolymer dispersion agent, shows that the dipole relaxation is more ideal and the activation energy for dipole relaxation is reduced compared with that observed in the pure resin. The introduction of titanium dioxide pigment reduces the activation energy but also increases the magnitude of the ohmic conductivity and space charge contributions to the dielectric permittivity. All the systems exhibit heterogeneity and in the case of a pigmented system charge carriers can be introduced into the system by the pigment. Clear differences are observed between TiO2 produced via the chloride and sulfate routes, reflecting different levels of charge carriers and ion mobile in the resin system. High levels of mobile ions were also observed when zinc oxide and silica were used as pigments. Note de contenu : - EXPERIMENTAL : Materials : titanium dioxide pigments - Surface area - Other pigments - Resins - Formulation of powder coating - Dielectric measurements - Dielectric theory results and discussion
- RESULTS AND DISCUSSION : Unpigmented resin with modaflow - Unpigmented resin without modaflow
- RESIN CONTAINING TITANIUM DIOXIDE PIGMENT : Titanium dioxide produced via the chloride route : Titanium dioxide produced via the sulfate route - Investigation of the possible influence of zinc oxide and silica on the relaxationsDOI : 10.1007/s11998-012-9405-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9405-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16024
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Code-barres Cote Support Localisation Section Disponibilité 14190 - Périodique Bibliothèque principale Documentaires Disponible Dragonfly-inspired nano coating kills bacteria upon contact in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4641 (05/2018)
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Titre : Dragonfly-inspired nano coating kills bacteria upon contact Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 28-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens
Matériaux hybrides
Oxyde de zinc
Poudres
Revêtements protecteurs
Surfaces antimicrobiennesIndex. décimale : 667.9 Revêtements et enduits Résumé : Studies have shown that the wings of dragonflies and cicadas prevent bacterial growth due to their natural structure. The surfaces of their wings are covered in nanopillars making them look hke a bed of nails. When bacteria come into contact with these surfaces, their cell membranes get ripped apart immediately and they are killed. This inspired researchers from the Institute of Bioengineering and Nanotechnology (IBN) of A*STAR in Singapore to invent an anti-bacterial nano coating for disinfecting frequently touched surfaces, such as door handles, tables and lift buttons. This technology will prove particularly useful in creating bacteria-free surfaces in places like hospitals and clinics, where sterilisalion is important to help control the spread of infections. Their new research was recently published in the journal Small. Note de contenu : - Need for a better way to disinfect surfaces
- Fig. 1 : Zinc oxide nanopillars that looked like a bed of nails can kill a broad range of germs when used as a coating on frequently-touched surfaces
- Fig. 2 : E coli bacteria destroyed by the anti-bacterial coating made from zinc oxide nanopillarsEn ligne : https://drive.google.com/file/d/1jev1bHbUyywFwjtpS10vVyIUVzwJ4OmG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30622
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Code-barres Cote Support Localisation Section Disponibilité 19929 - Périodique Bibliothèque principale Documentaires Disponible Les écrans solaires minéraux deviennent high-tech / Shaher Duchi in EXPRESSION COSMETIQUE, N° Hors-série (12/2021)
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Titre : Les écrans solaires minéraux deviennent high-tech Type de document : texte imprimé Auteurs : Shaher Duchi, Auteur ; Danny Goldstein, Auteur Année de publication : 2021 Article en page(s) : p. 284-289 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Cosmétiques
Dioxyde de titane
Encapsulation
Facteur de protection solaire
Microcapsules
Oxyde de zinc
Peau -- Soins et hygiène
Produits antisolaires
Transparence (optique)Index. décimale : 668.5 Parfums et cosmétiques Résumé : Que se passe-t-il si vous fusionnez la technologie avancée de micro-encapsulation avec le FPS ? Le résultat est un moyen innovant de protéger la peau des puissants rayonnements UVA et UVB, comme le montrent de nouvelles recherches. Note de contenu : - Un filtre UV non nano minéral
- Esthétique : transparence et écran solaire minéral invisible
- Analyse sensorielle : sensation cutanée supérieure
- Efficacité : test FPS in vitro
- tableau : Composition détaillée de chaque préparation dont les FPS ont été testés in vitroEn ligne : https://drive.google.com/file/d/1-dnSO9hyILtmTyuaoV5afzP6wqufZRR1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36629
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Code-barres Cote Support Localisation Section Disponibilité 23074 - Périodique Bibliothèque principale Documentaires Disponible Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation / Manisha V. Bagal in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)
[article]
Titre : Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation Type de document : texte imprimé Auteurs : Manisha V. Bagal, Auteur ; Rahul R. Saini, Auteur ; Abdul Rahim I. Shaikh, Auteur ; Saurabh Patil, Auteur ; Ashish V. Mohod, Auteur ; Dipak V. Pinjari, Auteur Année de publication : 2023 Article en page(s) : p. 30-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool polyvinylique
Dioxyde de titane
Matières plastiques -- Additifs
Micro-ondes
Oxyde de zinc
Polymères -- Détérioration
Surfactants
UltrasonsIndex. décimale : 668.4 Plastiques, vinyles Résumé : The degradation of polyvinyl alcohol (PVA) has been investigated using ultrasonic (US) as well as microwave (MW) irradiation techniques with the approach of process intensification based on different additives, such as Titanium Dioxide (TiO2), Sodium Lauryl Sulphate (SLS), Zinc Oxide (ZnO) and air. The effects of sonication time, initial polymer concentration, and temperature on the extent of reduction in viscosity have been thoroughly investigated using US as well as MW irradiation approaches. Basically, the degradation process has been optimized by utilizing two different ultrasonic reactors in a combined approach of ultrasonic horn and bath. The maximum extent of degradation of PVA was found to be 69.33% using MW irradiation with a required energy of 0.321 g/JL, and 62.47% using US horn with a required energy of 0.054 g/JL when operated at 0.1 g/L of TiO2 catalyst. The combination of US horn and US bath results in same degradation as 0.1 g/L of TiO2 catalyst with US horn. It has also been observed that the maximum degradation of PVA was obtained with a minimum treatment time of 3 min using MW irradiation, whereas the US horn required 40 min. Moreover, a lower extent of PVA degradation was obtained when additives were used, such as surfactants (SLS) and air. As a result, it can be inferred that the MW-assisted approach in the presence of process-intensifying additives/catalysts is the best approach for the degradation of PVA with a minimum energy consumption. Note de contenu : - MATERIALS AND METHODS : Materials - Ultrasonic and microwave irradiation reactor - Experimental methodology
- RESULTS AND DISCUSSION : Effect of operating power of microwave - The effect of the operating power of the microwave ovens on the extent - Effect of temperature - Effect of initial concentration - Effect of catalyst TiO2 loading - Effect of ZnO catalyst loading - Effect of surfactant loading on intrinsic viscosity - Effect of air sparging - Effect of the combination of ultrasonic horn and ultrasonic bath - Comparison of US and MW degradation
- Table 1 : Detailed data of efflux time, relative viscosity, specific viscosity, intrinsic viscosity and extent of degradation using ultrasound and MW-assisted approach (initial PVA) concentration of 0.5% (w/v), temperature 30 °C, efflux time for water (t) 9.48 s, volume 200 mL, MW power 300 W)
- Table 2 : Comparison of results obtained at optimized operating parameters (initial PVA) concentration of 0.5% (w/v), temperature 30 °C, volume 200 mL, MW power 300 W using ultrasound and MW-assisted approachDOI : https://doi.org/10.1515/ipp-2022-4232 En ligne : https://drive.google.com/file/d/1qtOseg66ug6sEjMoF9whC50kG6IGM1Lg/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39192
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Code-barres Cote Support Localisation Section Disponibilité 24052 - Périodique Bibliothèque principale Documentaires Disponible Effect of ink formulation on the inkjet printing process of Al–ZnO nanoparticles / Olga Shavdina in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
PermalinkEffect of nanosilica and Zno nanoparticles / Anabel Crespo Soler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4608 (05/2015)
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