Effect of titanium dioxide solubility on the formation of BaTiO3 nanoparticles in supercritical water

Mehrnoosh Atashfaraz; Mojtaba Shariaty-Niassar; Satoshi Ohara; Kimitaka Minami; Mitsuo Umetsu; Takashi Naka; Tadafumi Adschiri

doi:10.1016/j.fluid.2007.03.025

Effect of titanium dioxide solubility on the formation of BaTiO₃ nanoparticles in supercritical water

Mehrnoosh Atashfaraz, Mojtaba Shariaty-Niassar, Satoshi Ohara, Kimitaka Minami, Mitsuo Umetsu, Takashi Naka, Tadafumi Adschiri

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Fine BaTiO₃ nanoparticles were prepared by hydrothermal synthesis under supercritical condition (400 °C and 30 MPa) from mixture of barium hydroxide and titanium dioxide as starting precursors. First, conditions for synthesizing BaTiO₃ were examined by using batch reactors. High pH condition, pH > 13, is necessary to obtain phase pure BaTiO₃. The reason was discussed based on the solubility of titanium dioxide, which that dissolution-recrystallization process is essential for the synthesis of BaTiO₃ nanoparticles. Rapid heating of the starting precursors by mixing with high temperature water in a flow reactor is effective to synthesize smaller size and narrower particle size distribution for the BaTiO₃ nanoparticles, compared with the case of slow heating with a batch reactor.

Original language	English
Pages (from-to)	233-237
Number of pages	5
Journal	Fluid Phase Equilibria
Volume	257
Issue number	2
DOIs	https://doi.org/10.1016/j.fluid.2007.03.025
Publication status	Published - 2007 Aug 25

Keywords

BaTiO nanoparticles
Formation mechanism
Solubility
Supercritical water

ASJC Scopus subject areas

Chemical Engineering(all)
Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Effect of titanium dioxide solubility on the formation of BaTiO₃ nanoparticles in supercritical water. / Atashfaraz, Mehrnoosh; Shariaty-Niassar, Mojtaba; Ohara, Satoshi; Minami, Kimitaka; Umetsu, Mitsuo; Naka, Takashi; Adschiri, Tadafumi.

In: Fluid Phase Equilibria, Vol. 257, No. 2, 25.08.2007, p. 233-237.

Research output: Contribution to journal › Article › peer-review

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AU - Minami, Kimitaka

AU - Umetsu, Mitsuo

AU - Naka, Takashi

AU - Adschiri, Tadafumi

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