Relaxation of surface-tethered polymers under moderate confinement.

Relaxation of surface-tethered polymers under moderate confinement.
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适度约束下表面束缚聚合物的松弛

DOI:
10.1039/c8sm01246f
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发表时间:
2018
期刊:
影响因子:
3.4
通讯作者:
Steffen Hardt
Steffen Hardt
中科院分区:
化学2区
文献类型:
--
作者:
Johannes Hartmann;Tamal Roy;Kai Szuttor;Jens Smiatek;Christian Holm;Steffen Hardt

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我们研究了在适度限制下(即h <$Rg,其中h是通道高度和Rg是聚合物的回转半径)的微通道中的表面束缚聚合物的弛豫与荧光标记的DNA分子和耦合的晶格玻尔兹曼/分子动力学模拟的实验。确定的标度指数表明,松弛占主导地位的Zimm动力学与显着的链内流体动力学相互作用。DNA分子的弛豫在较浅的通道中较慢,表明限制对最长弛豫时间的显著影响。最长的弛豫时间作为分子轮廓长度和通道高度的函数的实验相关性。实验和模拟结果之间的良好协议。
We study the relaxation of surface-tethered polymers in microchannels under moderate confinement (i.e. h ∼ Rg, where h is the channel height and Rg is the radius of gyration of the polymer) by experiments with fluorescence-marked DNA molecules and coupled lattice-Boltzmann/molecular dynamics simulations. The determined scaling exponent suggests that the relaxation is dominated by Zimm-dynamics with significant intra-chain hydrodynamic interactions. The relaxation of the DNA molecules is slower in shallower channels, indicating a pronounced effect of confinement on the longest relaxation time. An experimental correlation is obtained for the longest relaxation time as a function of the molecular contour length and the channel height. Good agreement between the experimental and the simulation results is found.
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