Self-avoiding linear and star polymers anchored to membranes
Self-avoiding linear and star polymers anchored to membranes
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DOI：
10.1103/physreve.68.051801
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发表时间：
2003-11-01
影响因子：
2.4
通讯作者：
Gompper, G
中科院分区：
文献类型：
--
作者：
Auth, T;Gompper, G
通过蒙特卡罗模拟和标度参数研究了蘑菇区锚定线型和星型聚合物对膜曲率弹性的影响。我们描述了一种模拟方法来计算锚定聚合物的自由能作为膜曲率的函数，该方法足够精确地提取聚合物诱导的自发曲率Deltac(0)、弯曲刚度Deltakappa和杆上的鞍展弹性系数Delta(Kappa)的可靠数值。对于自回避线性聚合物和星形聚合物，据我们所知，第一次确定了曲率模数的普遍幅度以及有限链长的影响。我们发现，星形聚合物具有强烈影响c(0)和kappa的独特性质，但使(Kappa)在bar上基本保持不变。此外，星形聚合物比同等数量的线型聚合物对膜性能的影响要大得多。
The effect of anchored linear and star polymers in the mushroom regime on the curvature elasticity of membranes is investigated by Monte Carlo simulations and scaling arguments. We describe a simulation method to calculate the free energy of anchored polymers as a function of membrane curvature, which is accurate enough to extract reliable values for the polymer-induced spontaneous curvature Deltac(0), bending rigidity Deltakappa, and saddle-splay modulus Delta(kappa) over bar. For self-avoiding linear and star polymers, the universal amplitudes of the curvature moduli as well as the effects of finite chain lengths are determined, to our knowledge, for the first time. We find that star polymers have the unique property of strongly affecting c(0) and kappa, but leaving (kappa) over bar essentially unchanged. Furthermore, star polymers are shown to have a much stronger effect on membrane properties than an equivalent number of linear polymers.