Kierfeld J
Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany.
Phys Rev Lett. 2006 Aug 4;97(5):058302. doi: 10.1103/PhysRevLett.97.058302.
The thermally assisted force-induced desorption of semiflexible polymers from an adhesive surface or the unzipping of two bound semiflexible polymers by a localized force are investigated. The phase diagram in the force-temperature plane is calculated both analytically and by Monte Carlo simulations. Force-induced desorption and unzipping of semiflexible polymers are first order phase transitions. A characteristic energy barrier for desorption is predicted, which scales with the square root of the polymer bending rigidity and governs the initial separation process before a plateau of constant separation force is reached. This leads to activated desorption and unzipping kinetics accessible in single molecule experiments.
研究了半柔性聚合物从粘性表面的热辅助力诱导解吸或通过局部力使两个结合的半柔性聚合物解链的过程。通过解析计算和蒙特卡罗模拟得到了力-温度平面上的相图。半柔性聚合物的力诱导解吸和解链是一级相变。预测了解吸的特征能垒，其与聚合物弯曲刚度的平方根成比例，并在达到恒定分离力的平台之前控制初始分离过程。这导致了单分子实验中可获得的活化解吸和解链动力学。
