Journal of the Society of Cosmetic Scientists of Korea (대한화장품학회지)

Society of Cosmetic Scientists of Korea (대한화장품학회)
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STUDIES FOR THE CHARACTER OF NANO-SIZED $TiO_2$ PARTICLE SYNTHESIZED BY MICRO-EMULSION METHOD AND GOLD-DEPOSITED $TiO_2$ PARTICLE

  • Jhun, Hyun-Pyo (Research and Development Center, Evas Cosmetics., Ltd) ;
  • Park, Jae-Kiel (Research and Development Center, Evas Cosmetics., Ltd) ;
  • Lee, Kyoung-Chul (Natural Science Research Institute, Sung Kyun Kwan Univ) ;
  • Park, Jae-Eon (Research and Development Center, Evas Cosmetics., Ltd)
  • Published : 1996.06.01
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Abstract

Nano-Sized TiO$_2$ particles with diameter between 2 and 5 nm are synthesized in Water/Triton X-100/n-Hexane microemulsion. Particles show the amorphous structure and partially hydroxide form. The optical absorbance of particles appears at 250nm and band edge at 340nm. Gold metal is deposited on the surface of TiO$_2$ particles by reduction reaction of Au(III) ion with sodium hypophosphite. The size of gold-deposited particles is 20nm, and the optical absorbance appears at 270nm and at 550nm. So particles show the red color. The dense precipitation is formed by aggregation in the TiO$_2$ nano-sized particles of about 5nm size. But the bulky precipitation is formed by agglomeration phenomena in the gold-deposited particles of 20nm size. And also gold-deposited particles is easily dispersed by being re-dispersed in PEG/Water solution. This study has compared those things measuring the SPF characteristics of the cosmetics made of the synthesized particles. If the particle size is controlled appropriately, then the SPF value will be higher, or more colorless cosmetics will be made.

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