[article]
| Titre : |
A quantitative study of nanoparticle release from nanocoatings exposed to UV radiation |
| Type de document : |
texte imprimé |
| Auteurs : |
Lipiin Sung, Auteur ; Deborah Stanley, Auteur ; Justin M. Gorham, Auteur ; Savelas Rabb, Auteur ; Xiaohong Gu, Auteur ; Lee L. Yu, Auteur ; Tinh Nguyen, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 121-135 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Epoxydes
Essais accélérés (technologie)
Matériaux hybrides
Microscopie à force atomique
Morphologie (matériaux)
Nanoparticules
Nanoparticules -- Aspect de l'environnement
Photodétérioration
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet
Risques pour la santé
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.
Surfaces (Physique)
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties including the mechanical, electrical, gas barrier, and ultraviolet (UV) resistance of traditional coatings. These high performance nanocoatings are often used in outdoor environments. However, because polymers are susceptible to degradation by weathering elements, nanoparticles in a nanocoating may be released into the environment during its life cycle, which potentially poses an environmental health and safety concern and may hinder application of these advanced coatings. This study presents protocols and experimental technique to quantify the release of nanosilica from epoxy nanocoating as a function of UV exposure. Specimens of an epoxy coating containing 5% untreated nanosilica in specially designed holders were exposed to UV radiation (295–400 nm) in a well-controlled high-intensity UV chamber. Exposed specimens were removed at specified UV dose intervals for measurements of coating chemical degradation, mass loss, nanosilica accumulation on specimen surface, and nanosilica release as a function of UV dose. Measurement of nanosilica release was accomplished by (a) periodically spraying UV-exposed specimens with water, (b) collecting runoff water/released particles, and (c) analyzing collected solutions by inductively coupled plasma-optical emission spectrometry using a National Institute of Standards and Technology (NIST)-developed protocol. Results demonstrated that the amount of nanosilica release was substantial and increased rapidly with UV dose. Mass loss, chemical degradation, and silica accumulation on specimen surface also increased with UV dose. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURES : Materials and preparation of nanocoating - Characterizations of nanocoating degradation
- RESULTS : Chemical degradation of nanocoating exposed to UV - Mass loss - Surface morphological changes in nanocoating - Quantifying the amount of nanosilica release from nanocoating exposed to UV |
| DOI : |
10.1007/s11998-014-9620-9 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9620-9.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23212 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 121-135
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A quantitative study of nanoparticle release from nanocoatings exposed to UV radiation in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
