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Issue 22, 2011
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Organic–inorganic hybrid polysilsesquioxane nanospheres as UVA/UVB absorber and fragrance carrier

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Abstract

To avoid the photocatalysis property of inorganic UV absorbers, such as TiO2 and ZnO nanoparticles, and to utilize the minimal transdermal penetration and non-sticky nature of particulate silica particles, whilst at the same time fully harnessing the UV absorption characteristics of organic chromophores, hybrid organic–silica particles with UVA/UVB absorptive chromophores as part of their network structures were synthesized. Two UV absorptive hybrid nanospheres, poly[propyl-4-methoxycinnamamide silsesquioxane] (PTES4C) and poly[propyl-2,4-dimethoxycinnamamide silsesquioxane] (PTES24C), were synthesized through the hydrolysis-polycondensation of triethoxysilylpropyl-4-methoxycinnamamide (TES4C) and triethoxysilylpropyl-2,4-dimethoxycinnamamide (TES24C), respectively. Optimization of the catalyst type (acid, base or self-catalysis) and solvent (ethanol) and monomer concentrations, led to a high yield (71–73%) preparation of the two nanospheres. The two spheres displayed good sun protection factor (SPF) and UVA protection factor (UVA-PF) when used in a gel based formulation. The labile and volatile fragrant citronellal could be effectively loaded into the PTES4C spheres at 35–48% (w/w) via the in situhydrolysis–polycondensation reaction under self-catalysis conditions, and the obtained citronellal-loaded nanospheres demonstrated clear sustained controlled release of the citronella characteristics.

Graphical abstract: Organic–inorganic hybrid polysilsesquioxane nanospheres as UVA/UVB absorber and fragrance carrier

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Supplementary files

Article information


Submitted
07 Dec 2010
Accepted
24 Feb 2011
First published
01 Apr 2011

J. Mater. Chem., 2011,21, 7922-7930
Article type
Paper

Organic–inorganic hybrid polysilsesquioxane nanospheres as UVA/UVB absorber and fragrance carrier

P. Kidsaneepoiboon, S. P. Wanichwecharungruang, T. Chooppawa, R. Deephum and T. Panyathanmaporn, J. Mater. Chem., 2011, 21, 7922
DOI: 10.1039/C0JM04271D

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