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arXiv 1107.0308cond-mat.stat-mechq-bio.BM
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晶格高分子吸附转变的接触密度分析

Contact-Density Analysis of Lattice Polymer Adsorption Transitions

Michael Bachmann

摘要:

通过接触密度链增长模拟,我们研究了一个简单的晶格模型的柔性聚合物与一个有吸引力的基板相互作用。接触密度是单体-基底和单体-单体接触的数量的函数。这些接触数代表自然的序参量,并允许根据外部参数(例如基底的吸引强度和温度)对聚合物可接近的构象空间进行包括统计学研究。由于接触密度与相互作用的能量尺度无关,因此其对数是构象空间熵的无偏度量。通过设置明确的能量尺度,因此定义的,高度普遍的微接触熵可以很容易地与相应的混合聚合物-基底系统的微正则熵。

英文摘要:

By means of contact-density chain-growth simulations, we investigate a simple lattice model of a flexible polymer interacting with an attractive substrate. The contact density is a function of the numbers of monomer-substrate and monomer-monomer contacts. These contact numbers represent natural order parameters and allow for a comprising statistical study of the conformational space accessible to the polymer in dependence of external parameters such as the attraction strength of the substrate and the temperature. Since the contact density is independent of the energy scales associated to the interactions, its logarithm is an unbiased measure for the entropy of the conformational space. By setting explicit energy scales, the thus defined, highly general microcontact entropy can easily be related to the microcanonical entropy of the corresponding hybrid polymer-substrate system.

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