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Wet coating of calcite with silica nanoparticles in CO2 environment / Qitong Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)
[article]
Titre : Wet coating of calcite with silica nanoparticles in CO2 environment Type de document : texte imprimé Auteurs : Qitong Liu, Auteur ; Payam Hosseini, Auteur ; Raghavendra Ragipani, Auteur ; Bu Wang, Auteur Année de publication : 2024 Article en page(s) : p. 423-434 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcite Grâce à leurs performances analytiques, on observe un intérêt croissant pour l’utilisation des installations en rayonnement synchrotron et de certains appareils portables employant des sources de rayons X afin d’analyser, de révéler et de conserver les matériaux des objets du patrimoine.
La diffraction des rayons X va ainsi permettre de révéler la complexité de la nature des pigments utilisés par les artistes : c’est par la structure de la matière cristalline que l’on peut comprendre certaines de leurs propriétés optiques et mécaniques ainsi que leurs modes de synthèse.
Caractérisation
Dioxyde de silicium
Enrobage (technologie)
Granulométrie
Nanoparticules
Particules (matières)
Potentiel zeta
Revêtement humideIndex. décimale : 667.9 Revêtements et enduits Résumé : Calcite particles coated with nano-silica find use in applications such as enhanced oil recovery, paper-making, and thermal energy storage. In this study, the surface coating of calcite particles by silica nanoparticles (nano-SiO2) in aqueous solutions assisted by a CO2 environment was investigated. The result indicates that the coating performance can be controlled by altering the electrostatic attraction between calcite and nano-SiO2, with the calcite surface charge being the predominant factor. An elevated CO2 partial pressure (up to 3.7 atm) is beneficial for the coating process. However, similar coating performance can be achieved under lower CO2 partial pressures by introducing calcium salt into the aqueous solution. With the addition of 15 wt% of nano-SiO2 in a 6.5 mM CaCl2 solution, a nano-SiO2 loading content of 12.6 wt% (with an average calcite particle size of 6.74 µm) was achieved under 1 atm CO2 pressure after 24 h of the coating experiment. Overall, the coating of calcite surfaces with high contents of well-dispersed nano-SiO2 can be achieved in a CO2 environment, and calcium salts can be used to reduce the required CO2 pressure. As such, it is potentially feasible to integrate wet coating into aqueous carbonation-based CO2 mineralization processes to enhance process economics by making nano-SiO2-coated calcite a valuable byproduct. Note de contenu : - MATERIALS AND METHODS : Materials - Coating experiment - Sample characterizations - Particle size analysis (PSA) - Scanning electron microscopy (SEM) - Thermogravimetric analysis (TGA) - Zeta potential (ZP) measurement - Surface area measurement - Stability test
- RESULTS AND DISCUSSION : Characterization of calcite coated with nano-SiO2 - Effect of the CO2 environment on coating performance - Role of calcium concentration in coating performance - Enhancing the experimental feasibility and loading content
- Table 1 : The zeta potential of calcite and nano-SiO2
- Table 2 : Quantity of coated nano-SiO2 before and after stability testsDOI : https://doi.org/10.1007/s11998-023-00812-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00812-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40463
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 423-434[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24443 - Périodique Bibliothèque principale Documentaires Disponible Wood surface modification by in-situ sol-gel deposition of hybrid inorganic-organic thin films / Mandla A. Tshabalala in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 4 (12/2007)
[article]
Titre : Wood surface modification by in-situ sol-gel deposition of hybrid inorganic-organic thin films Type de document : texte imprimé Auteurs : Mandla A. Tshabalala, Auteur ; Li-Piin Sung, Auteur Année de publication : 2008 Article en page(s) : p. 483-490 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Bois -- Vernis
Couches minces
Matériaux hybrides
Nanoparticules
Sol-gel, Procédé
Surfaces (technologie)
Vernis -- AdditifsIndex. décimale : 667.6 Peintures Résumé : Interest in the use of nanoparticles of iron, titanium, aluminum, and zinc oxides in transparent coatings for wood is increasing. Such nano-composite coatings have the potential of not only preserving the natural color of the wood, but also stabilizing the wood surface against the combined degradative effects of sunlight and moisture. The nanoparticles can be used as additives to coating formulations or deposited directly as thin films on a substrate. Thin film deposition can be accomplished by plasma-enhanced chemical vapor or by sol-gel deposition. This paper describes sol-gel deposition of a hybrid inorganic-organic thin film on wood using a mixture of metal-organic precursors and its effect on weathering properties of the wood surface. DOI : 10.1007/s11998-007-9033-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9033-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3635
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 4 (12/2007) . - p. 483-490[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 009005 - Périodique Bibliothèque principale Documentaires Disponible Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I : morphological study and effect of relative humidity on adhesion strength / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)
[article]
Titre : Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I : morphological study and effect of relative humidity on adhesion strength Type de document : texte imprimé Auteurs : William Nguegang Nkeuwa, Auteur ; Bernard Riedl, Auteur ; Véronic Landry, Auteur Année de publication : 2014 Article en page(s) : p. 283-301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Argile
Bois -- Revêtements protecteurs
Nanoparticules
Revêtements -- Effets de l'humidité
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements multicouches
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 : Multilayer coatings that are used to protect surfaces of wood components constituting ready to assemble furniture must have good adhesion to the substrate, particularly for wood furniture used in high humidity environments like bathrooms. It is not known whether adding nanoparticles to such coatings will change their properties. Surfaces of yellow birch wood (Betula alleghaniensis Britton) were protected with six different types of multilayer coatings (MCs). Prepared primer and topcoat UV-curable formulations constituting these MCs contained, respectively, hydrophobic-fumed silica (NS) and nanoclays (NC). They were added at 0 and 0.5 wt% for NS and at 0, 1, and 3 wt% for NC. The viscosity behavior of these formulations was evaluated as a function of shear rate. The morphology of the cross-section of coated wood samples was qualitatively studied by means of both scanning and transmission electron microscopy (SEM and TEM analysis). The adhesion strength of these MCs on wood surfaces was assessed as a function of relative humidity (RH). TEM images have revealed that topcoats reinforced with NC appear to have an intercalated (micro and nanoparticles) morphology. Statistical results have shown that NS and NS × NC do not significantly confer additional adhesion strength of MCs on wood surfaces, whereas the effect of NC is significant. The adhesion strength of coated wood samples conditioned at 80% RH was higher than that obtained on those conditioned at 40% RH. Multilayer coating # 5 ([0.5 wt% NS—1 wt% NC] combination) has been chosen as the ideal protection system for two reasons: (i) high adhesion strength at low RH and (ii) good barrier properties. Note de contenu : - EXPERIMENTAL : Materials - UV-curable formulations : preparation and viscosity measurement - Statistical design - Wood surface preparation - Formulations application and UV-curing process - Preparation and conditioning of coated wood samples - Characterization - statistical analysis
- RESULTS AND DISCUSSION : Viscosity behavior of UV-curable formulations - Morphology of the cross-section of multilayer coatings on wood surfaces - Adhesion strength of multilayer coatings on wood surfaces
DOI : 10.1007/s11998-013-9551-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9551-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21448
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 3 (05/2014) . - p. 283-301[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16292 - Périodique Bibliothèque principale Documentaires Disponible Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part II : Application of a standardized test method to study the effect of relative humidity on scratch resistance / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
[article]
Titre : Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part II : Application of a standardized test method to study the effect of relative humidity on scratch resistance Type de document : texte imprimé Auteurs : William Nguegang Nkeuwa, Auteur ; Bernard Riedl, Auteur ; Véronic Landry, Auteur Année de publication : 2014 Article en page(s) : p. 993-1011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Air -- Humidité
Argile
Bois
Bois -- Revêtements
Caractérisation
Essais (technologie)
Essais de résilience
Evaluation
Nanoparticules
Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet
Revêtements multicouches
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.
StatistiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Coated wood surfaces of components constituting flooring and furniture for interior end uses that exhibit good tribological properties are highly desirable. Surfaces of yellow birch wood (Betula alleghaniensis Britton) were protected with six different types of multilayer coatings (MCs) developed in this study. Each MC consisted of three layers: primer, sealer, and topcoat. UV-curable primer and topcoat formulations were, respectively, reinforced with a hydrophobic fumed silica (NS: 0 and 0.5 wt% in the formulation) and nanoclay (NC: 0, 1, and 3 wt% in the formulation). The scratch resistance of MCs on wood surfaces conditioned at 40% and 80% relative humidity (RH) was quantitatively and qualitatively studied. Quantitative evaluation was performed according to a standardized scratch test, while scanning electron microscopy (SEM) analysis was used for qualitative evaluation. Statistical results have shown that NS, NC, and NS × NC do not have a significant effect on scratch resistance of coated wood surfaces, whereas the effect of RH is significant. Regardless of RH, SEM images reveal that: (i) there is no sign of lack of adhesion between coating layers and the MCs/wood surfaces interface and (ii) all the MCs seem to have a ductile/brittle response to scratching. Qualitative information was in accordance with quantitative results. Note de contenu : - EXPERIMENTAL : Materials - Statistical design - Wood surface preparation - Formulations application and UV-curing processes - Preparation and conditioning of coated wood samples - Characterization - Statistical analysis
- RESULTS AND DISCUSSION : Quantitative evaluation of scratch resistance of multilayer coatings on wood surfaces - Qualitative evaluation of scratch resistance of multilayer coatings on wood surfacesDOI : 10.1007/s11998-014-9609-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9609-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22321
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 993-1011[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16659 - Périodique Bibliothèque principale Documentaires Disponible Zinc oxide nanoparticles as antimicrobial agent / Marie Woost in PERSONAL CARE EUROPE, Vol. 5, N° 1 (02/2012)
[article]
Titre : Zinc oxide nanoparticles as antimicrobial agent Type de document : texte imprimé Auteurs : Marie Woost, Auteur ; Marc Thiry, Auteur ; Vesna Aleksandrovic-Bondzic, Auteur Année de publication : 2012 Article en page(s) : p. 55-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Cosmétiques
Nanoparticules
Oxyde de zincIndex. décimale : 668.5 Parfums et cosmétiques Résumé : In home and personal care, microorganisms play an important role. Cleansing products, for example, aim to remove dirt as well as harmful bacteria and fungi. Also,products contaminated by microorganisms will spoil faster and can harm the consumer. Zinc oxide nanoparticles have been known for their antimicrobial properties for some time. Also, the activity of magnesium oxide and copper in this field is already described. CANdot Series D, consisting of Cu and Mg doped zinc oxide, combine these efects in one nanoparticle system.
The particles show growth inhibiting properties against various micro organisms, e.g. Staphylococcus aureus, Staphylococcus epidermidis or Malassezia furfur. This makes them a promising tool for applications in the field of cosmetics, such as preservatives or anti-dandruff agents, just to name two. Other potential fields could be the application of CANdot Series D in polymer composites or paints to create antibacterial surfaces. Regarding EU cosmetics regulations, particles with a size over 100nm were developed.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13396
in PERSONAL CARE EUROPE > Vol. 5, N° 1 (02/2012) . - p. 55-57[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13662 - Périodique Bibliothèque principale Documentaires Disponible Zinc oxide (Zno) nanoparticles for enhancement of fastness properties in cationic finishing / RamKumar Kothandam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)
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