| 초록 |
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). 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. The strong contact time and pH-dependent chitosan−chitosan cohesion and adhesion properties provide new insight into the development of chitosanbased load-bearing materials. |
