Colloid Science in Supercritical Fluid
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- MUKA Sada-atsu
- Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology
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- DEGUCHI Shigeru
- Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology
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- TSUJII Kaoru
- Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University
Bibliographic Information
- Other Title
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- 超臨界流体中におけるコロイド科学
- チョウリンカイ リュウタイ チュウ ニ オケル コロイド カガク
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Abstract
Recent progress in our study on the behaviors of colloids in hot and compressed water is described. Dynamic light scattering measurements revealed that model colloids, which remain dispersed stably in water at ambient conditions, flocculate rapidly upon hrating under pressure. In order to obtain further insights into the colloidal dispersions at such extreme conditions, an optical microscope system equipped with a high-temperature and -pressure sample chamber was developed. Diffusion coeffcient of polystyrene latex (d=2.092μm) that undergose Brownian motion near a quartz surface was measured successfully in water at temperatures between 298K and 573K at constant pressure of 24.6 MPa, and abalyzed in terms of a large temprature dependent change of the density of water. Our experomental setups allow performing the measurements even in supercritical water (Tc=647 K, Pc=22.1 MPa). It seems lilely that intense density fluctuation and anomalies of physical properties such as heat capacity and thermal expansion coefficient near the critical point affect the colloidal behaviors. Future sirections of the work in relation to the critical phenomena and possible applications of the experiments under microgravity are discussed.
Journal
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- Journal of The Japan Society of Microgravity Application
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Journal of The Japan Society of Microgravity Application 23 (3), 145-, 2006-07-31
The Japan Society of Microgravity Application
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Details 詳細情報について
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- CRID
- 1391975831237546112
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- NII Article ID
- 10018210156
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- NII Book ID
- AN10537663
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- NDL BIB ID
- 8057791
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- ISSN
- 09153616
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed