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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.115  No.1348 (December) (2007)  >  pp.861-866

Journal of the Ceramic Society of Japan
<<Previous article Vol.115  No.1348 (December) (2007)   pp.861 - 866 Next article>>

Microinhomogeneity for Aqueous Mixtures of Water-miscible Organic Solvents

Toshiyuki TAKAMUKU1), Yasukuni NOGUCHI1), Miki NAKANO1), Masaru MATSUGAMI2), Hiroki IWASE3) and Toshiya OTOMO4)
1) Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
2) Department of General Education, Kumamoto National College of Technology
3) Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA)
4) Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)


  Mixing states for aqueous solutions of water-miscible organic solvents, acetonitrile and 1,4-dioxane, have been investigated at the molecular level by means of small-angle neutron scattering (SANS) and NMR relaxation. It has been shown that the organic solvent and water molecules are inhomogeneously mixed each other at the molecular level, although their mixtures are homogeneous at the macroscopic scale. Thus, both organic solvent clusters and water clusters coexist in the mixtures. The present investigation has also revealed that the microinhomogeneity of acetonitrile-water and 1,4-dioxane-water mixtures is gradually enhanced by cooling or adding salts toward phase separation. Based on the results, the effect of microinhomogeneity for solvent mixtures on chemical reactions was considered.



Keyword:
Mixing state, Aqueous mixtures, Clusters, Phase separation, SANS, NMR relaxation

Received: August 31, 2007
Accepted: September 20, 2007 , Published online: December 01, 2007
Copyright (c) 2007 The Ceramic Society of Japan

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