arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1306.4600cond-mat.softphysics.bio-phq-bio.BM
收藏

张力沿Polymer链的传播

Propagation of Tension along a Polymer Chain

Payam Rowghanian, Alexander Y. Grosberg

摘要:

我们研究了由外力引起的张力在两种不同的环境中沿着长的聚合物分子的传播,即沿着从一端被拉的3d空间中的自由聚合物,以及沿着被限制在狭窄的圆形管中的预拉伸的圆形聚合物。我们表明,在这两种情况下,张力传播是由扩散方程,特别是,张力前传播的$t^{1/2}$沿轮廓的链。数值结果得到了证实,并通过分子动力学模拟的情况下,三维聚合物。我们还比较了我们的结果与先前建议的易位设置,并讨论为什么张力传播较慢,在这种情况下。

英文摘要:

We study the propagation of tension caused by an external force along a long polymeric molecule in two different settings, namely along a free polymer in 3d space being pulled from one end, and along a pre-stretched circular polymer, confined in a narrow circular tube. We show that in both cases, the tension propagation is governed by a diffusion equation, and in particular, the tension front propagates as $t^{1/2}$ along the contour of the chain. The results are confirmed numerically, and by molecular dynamics simulations in the case of the 3d polymer. We also compare our results with the previously suggested ones for the translocation setting, and discuss why tension propagation is slower in that case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑