Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Properties of Water in Macromolecular Gels. V. Anomalous Temperature Dependence of the Nuclear Magnetic Resonance Line-width of Water in Macromolecular Gels
Masuo AizawaShuichi SuzukiTeruo SuzukiHiroshi Toyama
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1973 Volume 46 Issue 1 Pages 116-119

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Abstract

The line-width of the nuclear magnetic resonance (NMR) signal gets narrow, in general, with an increase in the temperature. In contrast, the NMR line-width of the water proton in agarose gels was found to increase with an increase in the temperature up to about 30°C. As for the other polysaccharide gels, such as curdlan-type polysaccharide, and κ-and λ-carrageenan gels, the NMR line-width of water increases with an increase in the temperature. The anomalous temperature dependence of the line-width was most marked in agarose gels than in other polysaccharide gels. The close relationship between the gel network, which consists of small cavities (microspace) of the micelle, and the magnitude of the anomality was revealed, this anomalous effect was named the “Micro-Space Effect.”

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