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625063 
Journal Article 
Structural degradation at the surface of a TiO2-based nanomaterial used in cosmetics 
Auffan, M; Pedeutour, M; Rose, J; Masion, A; Ziarelli, F; Borschneck, D; Chaneac, C; Botta, C; Chaurand, P; Labille, J; Bottero, JY 
2010 
1 
Environmental Science & Technology
ISSN: 0013-936X
EISSN: 1520-5851 
44 
7 
2689-2694 
English 
20222656 
WOS:000275993700071 
A number of commercialized nanomaterials incorporate TiO2
nanoparticles. Studying their structural stability inmediamimicking
the environment or the conditions of use is crucial in
understanding their potential eco-toxicological effects. We
focused here on a hydrophobic TiO2 nanoparticle-based
formulation used in cosmetics: T-Lite SF. It is composed of a
TiO2 core, coated withtwosuccessive protective layers of Al(OH)3,
and polydimethylsiloxane. Soon after contact with water (pH
) 5, low ionic strength), the T-Lite SF becomes hydrophilic and
form aggregates. During this aging, 90%wt of the total Si of
the organic layer is desorbed, and the PDMS remaining at the
surface is oxidized. The Al(OH)3 layer is also affected but
remains sorbed at the surface. This remaining Al-based layer
still protects from the production of superoxide ions from
thephotoactive/phototoxicTiO2 coreinourexperimentalconditions.