Zhou Haijun, Zhou Jie, Ou-Yang Zhong-Can, Kumar Sanjay
Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing 100080, China.
Phys Rev Lett. 2006 Oct 13;97(15):158302. doi: 10.1103/PhysRevLett.97.158302. Epub 2006 Oct 10.
The nature of the globule-coil transition of surface-confined polymers has been an issue of debate. Here this 2D collapse transition is studied through a partially directed lattice model. In the general case of polymers with positive bending stiffness (Delta>0), the collapse transition is first order; it becomes second order only in the limiting case of zero bending stiffness (Delta triple bond 0). These analytical results are confirmed by Monte Carlo simulations. We also suggest some possible future experiments.
表面受限聚合物的球-线团转变性质一直是一个有争议的问题。在此，通过一个部分定向晶格模型对这种二维塌缩转变进行了研究。在具有正弯曲刚度（Δ>0）的聚合物的一般情况下，塌缩转变是一级的；只有在弯曲刚度为零（Δ≡0）的极限情况下它才变为二级。这些分析结果通过蒙特卡罗模拟得到了证实。我们还提出了一些未来可能的实验。
