Journal
LANGMUIR
Volume 29, Issue 46, Pages 14222-14229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la403124u
Keywords
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Funding
- National Research Foundation of Korea
- Ministry of Science, ICT and Future Planning (MSIP) [NRF-C1ABA001-2011-0029960]
- MRSEC Program of the National Science Foundation [DMR 1121053]
- National Institutes of Health [R01 DE 018468]
- BK21 Plus
- Ministry of Education, Korea [10Z20130012243]
- National Research Foundation of Korea [2011-0029962] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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