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

41 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

Access to Document

10.1016/j.fluid.2007.03.025

Cite this

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title = "Effect of titanium dioxide solubility on the formation of BaTiO3 nanoparticles in supercritical water",

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.",

keywords = "BaTiO nanoparticles, Formation mechanism, Solubility, Supercritical water",

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

note = "Funding Information: This work was supported by a Scientific Research Grant from the Ministry of Education, Science, Sports, and Culture of Japan. This research was also partly supported by a Grant-in-Aid for the COE project, Giant Molecules and Complex Systems, 2002.",

year = "2007",

month = aug,

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doi = "10.1016/j.fluid.2007.03.025",

language = "English",

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T1 - Effect of titanium dioxide solubility on the formation of BaTiO3 nanoparticles in supercritical water

AU - Atashfaraz, Mehrnoosh

AU - Shariaty-Niassar, Mojtaba

AU - Ohara, Satoshi

AU - Minami, Kimitaka

AU - Umetsu, Mitsuo

AU - Naka, Takashi

AU - Adschiri, Tadafumi

N1 - Funding Information: This work was supported by a Scientific Research Grant from the Ministry of Education, Science, Sports, and Culture of Japan. This research was also partly supported by a Grant-in-Aid for the COE project, Giant Molecules and Complex Systems, 2002.

PY - 2007/8/25

Y1 - 2007/8/25

N2 - 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.

AB - 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.

KW - BaTiO nanoparticles

KW - Formation mechanism

KW - Solubility

KW - Supercritical water

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