When a long, semi-flexible polymer is adsorbed onto an adhesive surface, its bending
undulations on small scales act to renormalize the interaction potential between
the polymer and the surface. As a result, the polymer undergoes an unbinding
transition as one increases the temperature or decreases the magnitude of the
attractive polymer/surface interaction
This transition is second order if the interaction potential is independent of
the local polymer orientation, but first order if it is orientation-dependent
All critical exponents related to these desorption transitions can be obtained
via duality relations from a single exponent characterizing the shape fluctuations of the
Some semi-flexible polymers such as bacterial DNA form closed rings. When adsorbed onto topographically or chemically structured surfaces, such polymers attain a variety of different shapes, which reflect the competition between the polymers' bending stiffness and the polymer/surface interactions [4, 5].
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