Strong Adhesion and Cohesion of Chitosan in Aqueous Solutions
SCIE
SCOPUS
- Title
- Strong Adhesion and Cohesion of Chitosan in Aqueous Solutions
- Authors
- Dong Woog Lee; Chanoong Lim; Jacob N. Israelachvili; Hwang, DS
- Date Issued
- 2013-11-19
- Publisher
- American Chemical Society
- 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 (W-ad similar to 6.4 mJ/m(2)). 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 (W-co similar to 8.5 mJ/m(2)) between the films was measured with increasing contact times up to 1 h at pH 3.0, which is equivalent to similar 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27381
- DOI
- 10.1021/LA403124U
- ISSN
- 0743-7463
- Article Type
- Article
- Citation
- LANGMUIR, vol. 29, no. 46, page. 14222 - 14229, 2013-11-19
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