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Zinc oxide, which has photocatalytic activity, is used as a white pigment for cosmetics, resulting in a certain amount of sebum on the skin to be decomposed by the ultraviolet radiation in the sunlight. In this work, zinc phosphates as novel white pigments for use in cosmetics were prepared from zinc nitrate and sodium dihydrogen phosphate, and then ball-milled under various conditions. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. The zinc phosphate particle size was decreased by mechanical treatment. In particular, the sample treated with sodium lactate solution had much smaller particles. The milled zinc phosphates exhibited less photocatalytic activity than zinc oxide, and thus should not decompose sebum on the skin. The milled zinc phosphates showed sufficiently high reflectance within the range of visible light to act as novel white pigments. The sample treated with sodium lactate solution had higher water retention than the sample treated with water. Further, the slip resistance and roughness of the powder particles decreased as a result of treatment with sodium lactate solution.


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Effect of mechanical treatment on the powder properties of zinc phosphate white pigments

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

Abstract

Zinc oxide, which has photocatalytic activity, is used as a white pigment for cosmetics, resulting in a certain amount of sebum on the skin to be decomposed by the ultraviolet radiation in the sunlight. In this work, zinc phosphates as novel white pigments for use in cosmetics were prepared from zinc nitrate and sodium dihydrogen phosphate, and then ball-milled under various conditions. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. The zinc phosphate particle size was decreased by mechanical treatment. In particular, the sample treated with sodium lactate solution had much smaller particles. The milled zinc phosphates exhibited less photocatalytic activity than zinc oxide, and thus should not decompose sebum on the skin. The milled zinc phosphates showed sufficiently high reflectance within the range of visible light to act as novel white pigments. The sample treated with sodium lactate solution had higher water retention than the sample treated with water. Further, the slip resistance and roughness of the powder particles decreased as a result of treatment with sodium lactate solution.

Keywords:

white pigment, zinc phosphate, mechanical treatment, photocatalytic activity, water retention
Received: 13 May 2015 Revised: 03 August 2015 Accepted: 12 August 2015 Published: 02 December 2015 Issue date: April 2015
References(16)
[1]
Diebold U. The surface science of titanium dioxide. Surf Sci Rep 2003, 48: 53-229.
[2]
Senzui M, Tamura T, Miura K, et al. Study on penetration of titanium dioxide (TiO2) nanoparticles into intact and damaged skin in vitro. J Toxicol Sci 2010, 35: 107-113.
[3]
Gamer AO, Leibold E, van Ravenzwaay B. The in vitro absorption of microfine zinc oxide and titanium dioxide through porcine skin. Toxicol in Vitro 2006, 20: 301-307.
[4]
Jones DJ, Aptel G, Brandhorst M, et al. High surface area mesoporous titanium phosphate: Synthesis and surface acidity determination. J Mater Chem 2000, 10: 1957-1963.
[5]
Bhaumik A, Inagaki S. Mesoporous titanium phosphate molecular sieves with ion-exchange capacity. J Am Chem Soc 2001, 123: 691-696.
[6]
Onoda H, Yamaguchi T. Influence of ultrasonic treatment on preparation and powder properties of titanium phosphates. J Mater Chem 2012, 22: 19826-19830.
[7]
Onoda H, Yamaguchi T, Takenaka A. Synthesis and pigmental properties of titanium phosphate with the addition of urea. Int J Cosmetic Sci 2012, 34: 86-90.
[8]
Onoda H, Haruki M, Toyama T. Preparation and powder properties of zinc phosphates with additives. Ceram Int 2014, 40: 3433-3438.
[9]
Onoda H, Okumoto K, Tanaka I. Mechanochemical reforming on powder and acidic properties of copper cyclo-tetraphosphates. Mater Chem Phys 2008, 107: 339-343.
[10]
Taufiq-Yap YH, Goh CK, Hutchings GJ, et al. Influence of milling media on the physicochemicals and catalytic properties of mechanochemical treated vanadium phosphate catalysts. Catal Lett 2011, 141: 400-407.
[11]
Ramaswamy V, Jagtap NB, Vijayanand S, et al. Photocatalytic decomposition of methylene blue on nanocrystalline titania prepared by different methods. Mater Res Bull 2008, 43: 1145-1152.
[12]
Du P, Bueno-López A, Verbaas M, et al. The effect of surface OH-population on the photocatalytic activity of rare earth-doped P25-TiO2 in methylene blue degradation. J Catal 2008, 206: 75-80.
[13]
Mills A. An overview of the methylene blue ISO test for assessing the activities of photocatalytic films. Appl Catal B: Environ 2012, 128: 144-149.
[14]
Whitaker A. The crystal structure of hopeite, Zn3(PO4)2·4H2O. Acta Cryst 1975, 31: 2026-2035.
[15]
Onoda H, Haruki M, Toyama T. Influence of pH, concentration of sodium lactate as an additive and ultrasonic treatment on synthesis of zinc phosphate white pigments. Int J Cosmetic Sci 2014, 36: 321-326.
[16]
Cheng SY, Yuen CWM, Kan CW, et al. A comprehensive study of silicone-based cosmetic textile agent. Fiber Polym 2009, 10: 132-140.
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Publication history

Received: 13 May 2015
Revised: 03 August 2015
Accepted: 12 August 2015
Published: 02 December 2015
Issue date: April 2015

Copyright

© The author(s) 2015

Acknowledgements

The support of this work by The Cosmetology Research Foundation is gratefully acknowledged. The authors are grateful to Dr. Takeshi Toyama, Nihon University, Japan, for the smoothness measurements.

Rights and permissions

This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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