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Surface Chemistry and Dispersion Property of TiO2 Nanoparticles

Authors

  • Chia-Chen Li,

    Corresponding author
    1. Department of Materials & Mineral Resources Engineering, Institute of Materials Science and Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
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  • Shinn-Jen Chang,

    1. Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 30011, Taiwan
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  • Ming-Yu Tai

    1. Department of Materials & Mineral Resources Engineering, Institute of Materials Science and Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
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  • F. Rodrigues—contributing editor

  • This work was financially supported by the Ministry of Economic Affairs of Taiwan.

†Author to whom correspondence should be addressed. e-mail: ccli@ntut.edu.tw

Abstract

The effect of a foreign substance, silica (SiO2), on the surface chemistry, chemical reactivity, and dispersibility of titania (TiO2) nanoparticles was investigated. SiO2 covers 90% of the surface of commercially available TiO2 nanoparticles and provides higher acidity, which facilitates the absorption of alkaline surfactant, oleylamine, onto TiO2 nanoparticles, leading to more efficient nanoparticle dispersion. By removing the surface SiO2 with an acid treatment, the acidity of TiO2 was highly reduced and became favorable to being adsorbed and dispersed by the acidic surfactant, oleic acid.

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