高分子通过有限轴向长度纳米孔道的穿越行为研究
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- 英文论文题名：Translocation of a Polymer Chain Through a Nanotube with Finite length
- 论文作者：付翠柳 ; 孙昭艳
- 英文论文作者：Cui-Liu Fu ; Zhao-Yan Sun ; State Key Laboratory of Polymer Physics and Chemistry ; Changchun Institute of Applied Chemistry ; Chinese Academy of Sciences
- 年：2016
- 作者机构：高分子物理与化学国家重点实验室中国科学院长春应用化学研究所;
- 论文关键词：穿越 ; 受限 ; 拓扑 ; 分离 ; 高分子
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十四分会：超分子组装与软物质材料
- 语种：中文
- 分类号：O631.11
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十四分会 ; 超分子组装与软物质材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：263k
- 原文格式：D
- 会议级别：全国
摘要
高分子穿越纳米孔道的现象普遍存在于自然界中,比如DNA与RNA穿过细胞核膜等生命过程。目前,人们对高分子受限穿越行为的认识还不是十分清楚[1-4]。因此,我们基于耦合分子动力学/格子玻尔兹曼方法,系统研究了高分子通过孔径尺寸和轴向长度纳米孔道的穿越行为,着重探讨高分子的链长、纳米孔道的孔径与长度对高分子穿越纳米孔道的临界条件以及穿越模式的影响规律。结果表明纳米孔道的孔径较小时,孔道长度的增加会促使高分子的临界穿越条件升高,并且,孔道长度和外场强度共同决定高分子的穿越方式,外场较弱或孔道较长时,高分子以单链模式通过纳米孔道,外场变强或者孔道较短时,高分子的过孔构象逐渐转变成双链模式和多链模式。另一方面,当孔径较大时,孔道长度不再影响高分子通过纳米孔道的穿越行为,此时高分子以拉伸模式穿过纳米孔道。这些结果在分子水平上揭示高分子受限穿越过程的物理本质,将为人们实现多链拓扑结构高分子混合物的分离提供参考依据。
In order to clarify the influence of the polymer length, the size and length of a nanotube on the critical condition and the translocation model for a polymer chain when a successful translocation is happen, we have investigated the translocation behavior for a single polymer chain through a nanotube by using hybrid MD/LB method. For a nanotube with a small size, the critical condition will increase if the nanotube gets a larger length. In this case, a linear polymer could pass through a nanotube in three ways, i. e. single-chain model, double-chain model, and multi-chain model. On the other hand, for a nanotube with a large size, there is no influence of the length of nanotube on the translocation process, and the polymer passes through a nanotube in a way of stretched-chain model. Our results will be helpful to have a better understanding on the nature of polymer translocation behaviors.
In order to clarify the influence of the polymer length, the size and length of a nanotube on the critical condition and the translocation model for a polymer chain when a successful translocation is happen, we have investigated the translocation behavior for a single polymer chain through a nanotube by using hybrid MD/LB method. For a nanotube with a small size, the critical condition will increase if the nanotube gets a larger length. In this case, a linear polymer could pass through a nanotube in three ways, i. e. single-chain model, double-chain model, and multi-chain model. On the other hand, for a nanotube with a large size, there is no influence of the length of nanotube on the translocation process, and the polymer passes through a nanotube in a way of stretched-chain model. Our results will be helpful to have a better understanding on the nature of polymer translocation behaviors.
引文
[1]de Gennes,P.G.;J.Chem.Phys.,1974,60(12):5030-5042.
[2]Auger,T.;Mathe,J.;Viasnoff,V.;Charron,G.;Di Meglio,J.M.;Auvray,L.;Montel,F.;Phys.Rev.Lett..,2014,113(2):028302.
[3]Ledesma-Aguilar,R.;Sakaue,T.;Yeomans,J.M.;Soft Matter,2012,8(6):1884-1892.
[4]Zhou,K.;Lu,Y.;Li,J.;Shen,L.;Zhang,G.;Xie,Z.;Wu,C.;Macromolecules,2008,41(22):8927-8931.
[2]Auger,T.;Mathe,J.;Viasnoff,V.;Charron,G.;Di Meglio,J.M.;Auvray,L.;Montel,F.;Phys.Rev.Lett..,2014,113(2):028302.
[3]Ledesma-Aguilar,R.;Sakaue,T.;Yeomans,J.M.;Soft Matter,2012,8(6):1884-1892.
[4]Zhou,K.;Lu,Y.;Li,J.;Shen,L.;Zhang,G.;Xie,Z.;Wu,C.;Macromolecules,2008,41(22):8927-8931.