Suspensions of modified TiO2nanoparticles with supreme UV filtering ability,

Tina Ukmar; Aljaž Godec; Uroš Maver; Odon Planinšek; Marjan Bele; Janko Jamnik; Miran Gaberšček

doi:10.1039/B913180A

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Suspensions of modified TiO₂nanoparticles with supreme UV filtering ability†, ‡

Tina Ukmar,^a Aljaž Godec,^a Uroš Maver,^a Odon Planinšek,^b Marjan Bele,^a Janko Jamnik^a and Miran Gaberšček*^a

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* Corresponding authors

^a National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
E-mail: miran.gaberscek@ki.si
Fax: +386 1 4760 300
Tel: +386 14760 320

^b Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, 1000 Ljubljana, Slovenia

Abstract

TiO₂nanoparticles (20–23 nm in size) were coated with a silica layer onto which lauric acid was strongly bound. The strong (probably covalent) bonding was proved using detailed comparative thermal analysis. The functionalized TiO₂nanoparticles exhibited significantly reduced agglomeration, both in dry and in dispersed states (in oily media). The reduced tendency towards agglomeration was consistent with contact angle measurements which showed an increased hydrophobicity of functionalized TiO₂. The strong (covalent) bonding also greatly improved the stability of the nanoparticulate sample in suspensions. Finally, the UV filtering efficiency of functionalized samples was much improved when compared to non-functionalized or those functionalized using conventional stabilizers based on adsorption. This effect was consistent with our theoretical prediction in which we correlated the particle size and the UV filtering ability.

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Supplementary files

SI1. Derivation of dependence of UV filtering efficiency onparticle size. SI2. Detailed analysis of TG curves of presentsamples. PDF (283K)

Article information

DOI: https://doi.org/10.1039/B913180A
Article type: Paper
Submitted: 03 Jul 2009
Accepted: 27 Aug 2009
First published: 23 Sep 2009

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J. Mater. Chem., 2009,19, 8176-8183

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Suspensions of modified TiO₂nanoparticles with supreme UV filtering ability,

T. Ukmar, A. Godec, U. Maver, O. Planinšek, M. Bele, J. Jamnik and M. Gaberšček, J. Mater. Chem., 2009, 19, 8176 DOI: 10.1039/B913180A

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Journal of Materials Chemistry