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首页> 外文期刊>The Journal of Chemical Physics >The stretching force on a tethered polymer in pressure-driven flow
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The stretching force on a tethered polymer in pressure-driven flow

机译:在压力驱动流动中旋转聚合物上的拉伸力

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We use mesoscopic lattice-Boltzmann/molecular dynamics simulations to study the stretching behavior of a single tethered polymer in micro-and nanochannels. In particular, we are interested in the connection between fluid flow properties and the force on the polymer chain. An analytical expression for the stretching force is proposed, which linearly depends on the number of monomers and the boundary shear rate. In agreement with theory, the numerical findings reveal that the influence of hydrodynamic interactions can be ignored, which is also supported by results of additional Langevin dynamics simulations. Our simulation data coincide with the analytical expression for the fractional extension of the chain and further indicate that even weak Poiseuille flow profiles induce a strong alignment of the chain along the channel walls. The numerical results are in good agreement with experimental data obtained by microfluidic stretching of tethered lambda-DNA. Published by AIP Publishing.
机译:我们使用介镜晶格 - 玻璃器/分子动力学模拟来研究微型和纳米纳米型聚合物的拉伸行为。 特别是,我们对流体流动性能与聚合物链上的力之间的联系感兴趣。 提出了一种用于拉伸力的分析表达,其线性取决于单体的数量和边界剪切速率。 在理论上,数值发现表明,可以忽略流体动力学相互作用的影响,这也得到了额外的Langevin动力学模拟的结果。 我们的模拟数据与链条分数延伸的分析表达一致,进一步表明甚至弱的Poiseuille流程型材沿着沟道壁引起了链的强对准。 数值结果与通过微流体拉伸获得的束缚λ-DNA获得的实验数据一致。 通过AIP发布发布。

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