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Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for cosmetics. Their chemical composition, powder properties, photo catalytic activity, colour phase and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. The samples prepared at pH = 4 had particles smaller than 100 µm. Titanium phosphates had less photo catalytic activity to protect the sebum on the skin. The obtained materials in hydrothermal process and their thermal products at 100 ℃ showed high reflectance in the range of visible light.


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pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Show Author's information Hiroaki ONODA( )Taisuke YAMAGUCHI
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan

Abstract

Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for cosmetics. Their chemical composition, powder properties, photo catalytic activity, colour phase and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. The samples prepared at pH = 4 had particles smaller than 100 µm. Titanium phosphates had less photo catalytic activity to protect the sebum on the skin. The obtained materials in hydrothermal process and their thermal products at 100 ℃ showed high reflectance in the range of visible light.

Keywords:

titanium phosphates, pyrophosphate, pH, photo catalytic activity, smoothness
Received: 24 June 2014 Revised: 12 August 2014 Accepted: 18 August 2014 Published: 30 November 2014 Issue date: December 2014
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Publication history

Received: 24 June 2014
Revised: 12 August 2014
Accepted: 18 August 2014
Published: 30 November 2014
Issue date: December 2014

Copyright

© The author(s) 2014

Acknowledgements

The authors are grateful to Dr. Takeshi Toyama, Nihon University, Japan, for smoothness measurements.

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