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Ability of metallic nano-particles to provide UV protection to wood surface : a preliminary experiment / Tengfei Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Ability of metallic nano-particles to provide UV protection to wood surface : a preliminary experiment Type de document : texte imprimé Auteurs : Tengfei Yi, Auteur ; Jeffrey J. Morrell, Auteur Année de publication : 2022 Article en page(s) : p. 1535-550 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine
Bois -- Revêtements protecteurs
Caractérisation
Colorimétrie
Dioxyde de silicium
Dioxyde de titane
Evaluation
Fourier, Spectroscopie infrarouge à transformée de
Mouillabilité
Nanoparticules
Oxyde de fer
Oxyde de zinc
Pins et constituants
Protection contre le rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : The effects of various nano-particle types and sizes on color, wettability, and surface chemistry of radiata pine (Pinus radiata) sapwood samples were investigated over 6 weeks of outdoor exposure. Specimens were treated with 0.2% wt/wt water dispersions of zinc oxide (ZnO), titanium dioxide (TiO2), aluminum oxide (Al2O3), silica dioxide (SiO2), cerium dioxide (CeO2), and iron oxide (Fe2O3), and four nano-sizes of Fe2O3. Color changes during exposure were characterized by measuring CIE L*a*b* color parameters, surface wettability changes were assessed using water droplet contact angle, and chemical changes were characterized by Fourier transform infrared spectroscopy (FTIR). Nano-particles protected wood from photo-discoloration to differing degrees with iron oxide providing the most effective and consistent protection. Smaller alpha Fe2O3 nano-particles provided better UV protection. Nano-particles did not reduce wettability of wood after UV exposure nor were they able to completely prevent lignin degradation. Zinc oxide nano-particles provided some cellulose and hemicellulose protection during UV exposure. Iron oxide nano-particles exhibited some potential for limiting degradation, but the differences were small and not significant from untreated controls. The results suggest that combinations of zinc and iron oxide might be useful for UV protection, and further trials are planned with these mixtures. Note de contenu : - MATERIALS AND METHODS : Materials - Characterization of nano-particles - Preparation of nano-particle solutions and treatment of wood surfaces - Exterior exposure - Color measurements - Wettability assessment - Fourier transform infrared spectroscopy (FTIR)
- RESULTS AND DISCUSSION : Nano-particle size analysis - Color changes - Surface wettability changes - FTIR spectroscopic analysis
- Table 1 : Reported and actual dimensions of nano-particles used in this study
- Table 2 : Average solution uptakes of water alone or with 0.2% wt/wt of selected nano-particles
- Table 3 : Climate conditions at the test site over the 6-week field exposure
- Table 4 : Assignments of infrared bands to molecular bonds in wood
- Table 5 : Ratios of selected peaks on the FTIR spectra with the peak at 1057 cm−1 for non-coated radiata pine wood samples before and after 6 weeks of outdoor exposure
- Table 6 : Comparisons between ratios of peak heights at 3343 or 2921/2899 cm−1 with those at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeks
- Table 7 : Comparisons between peak heights of selected peaks with the peak at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeksDOI : https://doi.org/10.1007/s11998-022-00628-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00628-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38288
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1535-550[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible Adding value to sheep leather via coating with green synthesised zinc oxide nanoparticles approaches for advanced leather products / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)
[article]
Titre : Adding value to sheep leather via coating with green synthesised zinc oxide nanoparticles approaches for advanced leather products Type de document : texte imprimé Auteurs : M. A. Habib, Auteur ; Neha Mulchandani, Auteur Année de publication : 2022 Article en page(s) : p. 264-270 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture
Caractérisation
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de moutons
Nanoparticules
Oxyde de zinc
Traction (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is the oldest fibre which has been used by man since early times. In recent times, interest has increased in introducing smart properties to natural leather, giving it practical and economic importance. Recently, finishing, the purpose of which is to produce different leather types to meet consumer requirements has become focused on giving the leather properties that make it an advanced material with smart applications. The aim of this work is to produce superior quality leather that would upgrade its value in performance via nano metal oxide treatment. This aim has been followed by synthesising zinc oxide nanoparticles via green chemistry which is then loaded into sheep leather. The structural and morphological properties of the synthesised zinc oxide nanoparticles have been investigated by SEM and XRD. The SEM, EDX, infrared spectroscopy (FTIR) study, and tensile properties determination were undertaken, to see if any significant structural or chemical differences could be detected between ʻuntreatedʼ and ʻtreatedʼ leather. From the various analyses, it was ascertained that the nanoparticles were successfully deposited on the leather surface. The study thus provides an eco-friendly method for zinc oxide nanoparticle synthesis which can then be utilised for finishing sheep leather for creating functional properties. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Incorporation of zinc oxide nanoparticles onto the leather surface - Leather characterisation
- RESULTS : X-ray diffraction spectroscopy (XRD) analysis of zinc oxide nanoparticles - Scanning electron microscopy (SEM) analysis and EDX analysis - Fourier transform infrafred spectroscopy (FTIR) analysis - Tensile strength and elongation at break measurements
- Table 1 : The functional groups in leatherEn ligne : https://drive.google.com/file/d/1MtOaZZGQq5HajPmRh9kzeIO8XijBc0qR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38519
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 6 (11-12/2022) . - p. 264-270[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23756 - Périodique Bibliothèque principale Documentaires Disponible An investigation on usage of sodium borohydride and zinc oxide as oxygen scavengers in polyethylene terephthalate films / Ilhan Özen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)
[article]
Titre : An investigation on usage of sodium borohydride and zinc oxide as oxygen scavengers in polyethylene terephthalate films Type de document : texte imprimé Auteurs : Ilhan Özen, Auteur Année de publication : 2012 Article en page(s) : p. 493-497 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Borohydrure de sodium Le tétrahydruroborate de sodium, aussi appelé borohydrure de sodium, est un composé chimique constitué d'atomes de bore, de sodium et d'hydrogène. Sa formule brute est NaBH4.
C'est un agent réducteur utilisé notamment dans l'industrie pharmaceutique en tant que source d'hydrures H-. C'est un solide blanc, souvent rencontré sous forme de poudre.
Le borohydrure de sodium absorbe l'humidité de l'air (il est hygroscopique). Il réagit avec l'eau et dégage lentement du dihydrogène, un gaz inflammable/explosif. Selon la classification européenne des produits chimiques, il est enregistré avec la phrase de risque R14 "réagit violemment au contact de l'eau". Le produit se décompose à plus de 400 °C sans fondre. Sa décomposition est violente et exothermique avec l'eau.
Capteurs (technologie)
Films plastiques
Matériaux -- Propriétés barrières
Matières plastiques -- Extrusion:Polymères -- Extrusion
Oxyde de zinc
Oxygène
Polyéthylène téréphtalateIndex. décimale : 668.9 Polymères Résumé : The aim of this work is the production and characterisation of a plastic film having active oxygen barrier properties. The films have been obtained by adding an oxygen scavenger (either sodium borohydride (NaBH4) or zinc oxide (ZnO)) into a polyethylene terephthalate (PET) matrix during the extrusion process. In order to investigate the activity of the scavengers used, the produced films have been subjected to permeability measurements. It was revealed that NaBH4 – though a strong reductive agent – didn’t cause any degradation in matrix polymer but served as an ineffective oxygen scavenger as in the case of ZnO. DOI : 10.3139/217.2613 En ligne : https://drive.google.com/file/d/1MENbIXiAdGFiyS-MPffEdVC0bzu3w09T/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15773
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Code-barres Cote Support Localisation Section Disponibilité 14087 - Périodique Bibliothèque principale Documentaires Disponible Anticorrosion and barrier properties appraisal of poly(dimethylsiloxane)–ZnO nanocoating transition from superhydrophobic to hydrophobic state / Innocent O. Arukalam in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
[article]
Titre : Anticorrosion and barrier properties appraisal of poly(dimethylsiloxane)–ZnO nanocoating transition from superhydrophobic to hydrophobic state Type de document : texte imprimé Auteurs : Innocent O. Arukalam, Auteur ; Ying Li, Auteur Année de publication : 2019 Article en page(s) : p. 1077-1088 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Hydrophobie
Matériaux -- Propriétés barrières
Mouillabilité
Oxyde de zinc
Revêtements protecteurs
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : The anticorrosion and barrier properties of poly(dimethylsiloxane) (PDMS)–ZnO nanocoating transition from superhydrophobic to hydrophobic state have been evaluated. The main objective was to appraise the durability performance of anticorrosion and barrier properties of the pristine superhydrophobic coating and its hydrophobic state after long-term exposure to marine water. Thus, water wettability, surface features, and corrosion resistance, as well as barrier performance of the 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane-modified PDMS–ZnO coating were evaluated after 15 cycles (1 h to 60 days) of immersion in 3.5 wt.% NaCl solution. The evaluations were made by use of surface analytical, physicochemical, and electrochemical techniques. The results show that the coating transformed from superhydrophobic state (after 1 h) to hydrophobic state (after 60 days). The transition was due to effect of corrosiveness of the salty water and disappearance of the surface air layer with consequent reduction in the surface roughness and increase in the porosity of the coating. Correspondingly, the value of the impedance modulus decreased from 4.257 × 109 Ω cm2 (after 1 h) to 7.175 × 108 Ω cm2 (after 60 days). The trend of coating film (Rcf) and charge transfer (Rct) resistances with immersion time was found to be somewhat stable after 40-day immersion time. The observed high values of impedance modulus (|Z|f=0.01 Hz), Rcf and Rct after 60 days of immersion clearly demonstrate that the anticorrosion property and barrier performance of the transformed hydrophobic PDMS–ZnO coating were good. Note de contenu : - Wettability results of the coating
- Results of surface microstructure and roughness of the coating
- Chemical composition of the superhydrophobic PDMS-ZnO nanocoating
- Electrochemical impedance spectroscopy (EIS) results
- Effect of wetting and immersion time on the anticorrosion behavior of the coatingDOI : 10.1007/s11998-018-00182-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00182-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32863
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 1077-1088[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21127 - Périodique Bibliothèque principale Documentaires Disponible Application of nanometre materials in modifying acrylate latex / Yilu Gong in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4651 (05/2019)
[article]
Titre : Application of nanometre materials in modifying acrylate latex Type de document : texte imprimé Auteurs : Yilu Gong, Auteur ; Tantan Shao, Auteur ; Xin Zhang, Auteur ; Dawei Chen, Auteur ; Zhibin Cai, Auteur ; Lijun Chen, Auteur Année de publication : 2019 Article en page(s) : p. 51-53 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane
Latex
Nanoparticules
Oxyde de silicium
Oxyde de zinc
Polyacrylates
Polymères en émulsionIndex. décimale : 667.9 Revêtements et enduits Résumé : Acrylate latex is widely used in coating film forming agents, textile printing and dyeing adhesives, daily chemical products, medical polymers etc. However, the drawbacks of the acytate, such as poor water resistance, easy brittleness at low temperature and losing adhesion at high temperature have limited its further application. Thus, it is necessary to modify the latex to widen its application. Nowadays, more and more attention has been focused on nanometre-acrylate composite materials, such as silicon dioxide, titanium dioxide, alumina, zinc oxide etc, which have been used in emulsion polymerisation to improve the properties of acrylate latex because of the particular properties of the nanometer materials. In this paper, the modification of acrylate latex with nanometer materials is reviewed in detail, which can bring some inspiration to modification of the acrylate latex. Note de contenu : - Single component nanomaterials
- Two-component nano-composite system
- organic-inorganic nanocomposite systemEn ligne : https://drive.google.com/file/d/1ygMoEZr9RkH6AByTX6ZxgTq3BbG_rBOJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32609
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4651 (05/2019) . - p. 51-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20960 - Périodique Bibliothèque principale Documentaires Disponible Artists' paints innovation focuses on environmental health, while maintaining quality / Sarah Gibbons in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4647 (12/2018)
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