首页|Spherical Confinement Generates Entropic Force to Accelerate Polymer Chain Detachment

Spherical Confinement Generates Entropic Force to Accelerate Polymer Chain Detachment

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To understand the dynamic process of polymerdetachment,it is necessary to determine the mean detachment time of a single break-able link,which is modeled as a spring.Normally,this time can be viewed as the escape of a Brownian particle from the potential well of the spring.However,as the free dangling length of the polymer chain increases,the conformational entropy of the chain is affected by geometric confinement.It means that the wall exerts a repulsive force on the chain,resulting in accelerated link detachment from a macroscopic perspec-tive.In this work,we investigate the effect of entropy on the detachment rate in the case where the substrate is spherical.We demonstrate that spherical confinement accelerates chain detachment both inside and outside the sphere.An analytical expression for the mean detachment time of breakable links is given,which includes an additional pre-factor that is related to the partition function.Additionally,we analyze the expres-sions for entropic forces inside the sphere,outside the sphere,and on a flat wall,comparing their magnitudes to explain the difference in mean detachment time.

Polymer detachmentBreakable linkEntropic forceMean first passage time

Yu-Shan Zheng、Jian-Ping Zhou、Yan Xu、Kai Li

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Mechanical Engineering,Xinjiang University,Urumqi 830002,China

National Natural Science Foundation of ChinaXinjiang Tianchi PhD ProjectNatural Science Foundation of XinjiangXinjiang Basic Research Funds for UniversitiesRobot-Intelligent Equipment Technology InnovationXinjiang Tianshan Science Technology Innovation Leading Talents Program

51965057TCBS2021132022D01C34XJEDU2022P0172022D140022022TSYCLJ0044

2024

10.1007/s10118-023-3049-5

高分子科学(英文版)
中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCD
影响因子：0.721
ISSN：0256-7679
年,卷(期)：2024.42(3)
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