期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 14, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-012-0787-7
关键词
SEM-EDS; HR-TEM; Nanosized TiO2 particles; Al(OH)(3) coating; Sunscreen lotions; Nanotechnology; Environmental and health effects
资金
- National Risk Management Research Laboratory (NRMRL) of U.S. Environmental Protection Agency (EPA), Cincinnati, Ohio
Nanosized TiO2 particles (nTiO(2)) are usually coated with an Al(OH)(3) layer when used in sunscreen to shield against the harmful effects of free radicals that are generated when these particles are exposed to UV radiation. Therefore, it is vital to insure the structural stability of these particles in the environment where the protective layer may be damaged and adverse health and environmental effects can occur. This study utilized X-ray analysis (SEM-EDS) to provide a qualitative and semi-quantitative assessment of the chemical and physical characteristics of Al(OH) 3-coated original and damaged nTiO2 particles (used in sunscreen lotion formulations) in the presence of both swimming pool and seawater. Also, by utilizing statistical tools, a distribution of Al/Ti (%) on the particle surface was determined and evaluated. It was found that 45 min of treatment with swimming pool and seawater significantly induced the redistribution of Al/Ti (%), which changed the surface characteristics of particles and, therefore, may have induced undesired photo-activity and the consequent formation of free radicals.
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