NDLI: Environmental aging alters Al(OH)<sub>3</sub> coating of TiO<sub>2</sub> nanoparticles enhancing their photocatalytic and phototoxic activities

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Environmental Science: Nano Vol - 3 Issue - 2

Environmental Science: Nano Vol - 3 Issue - 1

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Environmental aging alters Al(OH)₃ coating of TiO₂ nanoparticles enhancing their photocatalytic and phototoxic activities

Content Provider	Royal Society of Chemistry (RSC)
Author	Al-Abed, Souhail R. McCarrick, Robert M. Dreher, Kevin Childs, Kristin Degn, Laura L. Ma, Hongbo Boyes, William K. Ortenzio, Jayna N. R. Diamond, Steve Virkutyte, Jurate Coates, Najwa Haykal Zucker, Robert
Copyright Year	2016
Abstract	As a component of sunscreen formulations, TiO2 engineered nanomaterials (ENM) are coated to prevent reactive oxygen species from causing damage to skin. We investigated the stability of an Al(OH)3 coating by exposing 25 nm Al(OH)3·TiO2 ENM to simulated swimming pool water (SPW) for 45 minutes, 1, 3, 10, or 14 days. Electron microscopy and spectroscopy indicated that exposure to SPW caused a redistribution of the Al(OH)3 coating allowing photocatalytic formation of hydroxyl radicals. Aged ENM showed significantly greater phototoxicity under UVA irradiation than un-aged ENM in a human-derived retinal pigment epithelium cell line (ARPE-19). Photocatalytic activity and phototoxicity of aged Al(OH)3·TiO2 was significantly less than that of the positive control—uncoated P25 TiO2. In summary, the aging of Al(OH)3·TiO2 ENM in SPW redistributed the coating and reduced its protective properties, thereby increasing reactivity and potential phototoxicity.
Starting Page	593
Ending Page	601
Page Count	9
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	3
Issue Number	3
Journal	Environmental Science: Nano
DOI	10.1039/c5en00250h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Sunscreen Nanomaterials Asteroid family Reactive oxygen species Aluminium hydroxide Electron microscope Absorption spectroscopy Hydroxyl radical Phototoxicity Ultraviolet Retinal pigment epithelium
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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Environmental aging alters Al(OH)3 coating of TiO2 nanoparticles enhancing their photocatalytic and phototoxic activities

Environmental aging alters Al(OH)₃ coating of TiO₂ nanoparticles enhancing their photocatalytic and phototoxic activities