Particle-Size-Dependent Hydrophilicity of TiO2 Nanoparticles Characterized by Marcus Reorganization Energy of Interfacial Charge Recombination

Size-dependent hydrophilicity of TiO2 nanoparticles has been investigated by an interface transient molecular probe method. The results show that the reorganization energy for the interfacial charge recombination of the probe molecule can be a specific parameter for characterizing the hydrophilicity...

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Veröffentlicht in:Journal of physical chemistry. C 2008-06, Vol.112 (24), p.8995-9000
Hauptverfasser: Hao, Ya-Qiong, Wang, Yan-Feng, Weng, Yu-Xiang
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Sprache:eng
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Zusammenfassung:Size-dependent hydrophilicity of TiO2 nanoparticles has been investigated by an interface transient molecular probe method. The results show that the reorganization energy for the interfacial charge recombination of the probe molecule can be a specific parameter for characterizing the hydrophilicity of the nanoparticles which is in accordance with the density of the surface hydroxyl group as a parallel parameter. The observed hydrophilicity in terms of either reorganization energy or the density of the surface hydroxyl group decays monoexponential with the mean particle diameter, having decay constant of 1/3.2 nm−1 for the former and 1/1.8 nm−1 for the latter.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp802532w