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    Force Titration of Langmuir-Blodgett Bilayers of Glycine Amphiphiles: JKR-Type Measurements Using the Surface-Force Apparatus

    Year: 2002

    Journal: Langmuir 2002, 18, 2702-2709, 20111221

    Authors: James Schneider,  Yoav Dori, Kraig Haverstick, Matthew Tirrell, Ravi Sharma

    Organizations: aDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 bMaterials Science and Engineering Division, Eastman Kodak Company, Rochester, New York 14650-2158

    Using the surface-force apparatus, we have made Johnson-Kendall-Roberts (JKR)-type adhesion measurements between Langmuir-Blodgett (LB) bilayers of a novel glycine amphiphile. The bilayers show a pronounced adhesion hysteresis at low pH that is completely removed at high pH. The adhesion hysteresis is marked by a spatially varying adhesion gradient on unloading that can be explained in terms of pH-dependent jump-to-contact forces. In addition to providing some insight into the mechanisms of interfacial bonding in biological systems, the JKR technique applied to LB bilayers of peptide amphiphiles emerges as a novel, quantitative method for fundamental bioadhesion measurements.