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제목   [13.11월] 황동수 교수 연구실 Strong Adhesion and Cohesion of Chitosan in Aqueous Solutions   이름  관리자
날짜  2013-11-21 10:52:31 조회  2588 추천  0
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Title: Strong Adhesion and Cohesion of Chitosan in Aqueous Solutions

Authors: Dong Woog Lee, Chanoong Lee, Jacob N. Israelachvili, Dong Soo Hwang

Journal: Langmuir (IF = 4.1)

Abstract:

Chitosan, a load-bearing biomacromolecule found in the exoskeletons of crustaceans and insects, is a promising biopolymer for the replacement of synthetic plastic compounds. Here, surface interactions mediated by chitosan in aqueous solutions, including the effects of pH and contact time, were investigated using a surface forces apparatus (SFA). Chitosan films showed an adhesion to mica for all tested pH ranges (3.0-8.5), achieving a maximum value at pH 3.0 after a contact time of 1 h (Wad 6.4 mJ/m2). We also found weak or no cohesion between two opposing chitosan layers on mica in aqueous buffer until the critical contact time for maximum adhesion (chitosan-mica) was reached. Strong cohesion (Wco 8.5 mJ/m2) between the films was measured with increasing contact times up to 1 h at pH 3.0, which is equivalent to 60% of the strongest, previously reported, mussel underwater adhesion. Such time-dependent adhesion properties are most likely related to molecular or molecular group reorientations and interdigitations. At high pH (8.5), the solubility of chitosan changes drastically, causing the chitosan-chitosan (cohesion) interaction to be repulsive at all separation distances and contact times. The strong contact time and pH-dependent chitosan-chitosan cohesion and adhesion properties provide new insight into the development of chitosan-based load-bearing materials.

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