JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
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Reversible Hardness Variance as a Commonly Observable Phenomenon for Various Amphoteric Gels
Hirohisa TAMAGAWAFumio NOGATAToyotaka WATANABEAkinori ABEJi-Ye JINSuzana POPOVICMinoru TAYA
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2002 Volume 45 Issue 4 Pages 579-584

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Abstract

Acrylamide-based amphoteric gel containing -COOH and -NH2 can be hardened through the formation of salt-linkages, -COO-···+H3N-, which serve as columns to reinforce the gel matrix. These salt-linkages can be formed and disrupted reversibly by the control of ionic strength of bathing solution, resulting in the gel hardness variance. The same kind of salt-linkages were also found to form between immobile -SO3H and -NH2 both imported in acrylamide-based gels, in the form of -SO3-···+H3N-. It was also observed a reversible formation and disruption of -SO3-···+H3N- according to the ionic strength of bathing solution. Thus the import of both -SO3H and -NH2 groups in a single gel is expected to induce a reversible hardening and softening of gel matrix through the formation of salt-linkages. From this observation, it was strongly speculated that the reversible hardness variance has to be a quite common phenomenon for any type of amphoteric gel.

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© 2002 by The Japan Society of Mechanical Engineers
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