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Simulation of a flexible polymer tethered to a flat adsorbing surface

机译:束缚在平坦吸附表面上的柔性聚合物的模拟

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A lattice self-avoiding polymer chain with one end attached to an adsorbing flat surface is simulated using Monte Carlo method. The chain model has z = 26 bond vectors with bond length being 1, $2$, and $3$ on the simple cubic lattice. The dependence of the number of surface contacts M on temperature T in the unit E/k _B with E the interacting energy and k B the Boltzmann constant and chain length N is investigated by a finite-size scaling law M = N φ(a _0 + a _1(T - T _c)N ~(1/?) + O((T - T _c) ~2N ~(2/?))) near the critical adsorption point T _c. It was estimated that T _c = 1.625 and the exponents φ = 0.52 and ? = 1.63. It was observed that both mean square end-to-end distance aR ~2 and mean square radius of gyration aRag2a reach minimum at T _c. And we discover that the asphericity parameter aAa is independent of chain length at T _c. A simple relationship is discovered between T _c and bond vector number n _b for lattice chain models, and which can be extended to nonlattice chain models by introducing an attraction range fraction f.
机译:使用蒙特卡罗方法模拟了一端连接到吸附平面上的晶格自规避聚合物链。链模型的z = 26个键向量,键的长度分别为1,$ 2 $和$ 3 $。通过有限尺寸比例定律M = Nφ(a _0)研究单位面积E / k _B中表面接触M的数量对温度T的依赖性,其中E为相互作用能量,k B为玻尔兹曼常数和链长N。在临界吸附点T _c附近+ a _1(T-T _c)N〜(1 /?)+ O((T-T _c)〜2N〜(2 /?)))。据估计,T_c = 1.625,指数φ= 0.52和σ。 = 1.63。观察到,在T _c处,均方的端到端距离aR〜2和回转的均方半径aRag2a均达到最小值。并且我们发现非球面度参数aAa与T_c处的链长无关。对于晶格链模型,在T _c和键向量数目n _b之间发现了一种简单的关系,可以通过引入吸引范围分数f将其扩展到非晶格链模型。

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