Hydroxyapatite nanoparticles as stimulus-responsive particulate emulsifiers and building block for porous materials.

Hydroxyapatite nanoparticles as stimulus-responsive particulate emulsifiers and building block for porous materials. Research Abstract Details 

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Hydroxyapatite nanoparticles as stimulus-responsive particulate emulsifiers and building block for porous materials. Abstract Text:

Syuji Fujii,Masahiro Okada,Tsutomu Furuzono,Syuji Fujii,Masahiro Okada,Tsutomu Furuzono,

Hydroxyapatite (HAp) nanoparticles with spherical, rod-shaped or fiber-shaped morphologies were synthesized by wet chemical method in aqueous media. Scanning electron microscopy, dynamic light scattering, helium pycnometry, and aqueous electrophoresis techniques were used to characterize the nanoparticles in terms of their particle size and morphology, density and zeta potential, respectively. Stable "Pickering-type" emulsions were prepared using the HAp nanoparticles as a particulate emulsifier and methyl myristate as an oil phase above pH 7.7, but not below pH 6.1. These emulsions were characterized in terms of their emulsion type, mean droplet diameter and morphology using electrical conductivity, light diffraction and optical microscopy. Rapid demulsification could be induced by lowering the solution pH: addition of acid led to dissolution of the HAp nanoparticles attached on oil-water interface and the emulsion was destabilized. HAp nanoparticles precipitated by addition of base to the aqueous phase after demulsification and the HAp particles precipitated worked as an effective particulate emulsifier. This emulsification-demulsification cycle was reversible. Sintering of methyl myristate-in-water emulsion stabilized with the HAp nanoparticles led to a porous HAp material.

Hydroxyapatite nanoparticles as stimulus-responsive particulate emulsifiers and building block for porous materials. Publishing Authors By Initials

S Fujii,M Okada,T Furuzono,S Fujii,M Okada,T Furuzono,

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Hydroxyapatite nanoparticles as stimulus-responsive particulate emulsifiers and building block for porous materials. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of colloid and interface science

VOLUME: 315

Page Numbers: 287-96

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ISSN: 0021-9797

DAY: 4

MONTH: 07

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 43125

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AFFILIATION: Department of Applied Chemistry, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka 535-8585, Japan. s.fujii@chem.oit.ac.jp

Country: United States

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MEDLINETA: J Colloid Interface Sci

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