Effects of surface roughness on the self-diffusion dynamics of a single polymer
文献类型：期刊论文
| 作者 | Li, Jiaxiang1,2; Ding, Mingming1; Zhang, Ran1; Shi, Tongfei1,2 |
| 刊名 | SOFT MATTER
 |
| 出版日期 | 2018-05-14 |
| 卷号 | 14期号:18页码:3550-3556 |
| ISSN号 | 1744-683X |
| DOI | 10.1039/c7sm02505j |
| 英文摘要 | We employ molecular dynamics simulations to simulate the diffusion dynamics of a single polymer adsorbed on surfaces with different roughnesses, which are characterized by the separation distance between obstacles and the height of obstacles. Our simulations demonstrate that for strong adsorption and when the confinement of obstacles is strong enough for all chains, the scaling exponent of the diffusion coefficient on the chain length exhibits three cases with increase of the height of obstacles: a Rouse plateau with alpha approximate to -1 (the lateral motion of the polymer chains is free), a reptationlike plateau with alpha approximate to -1.5 (the polymer chains can hardly stride over the obstacles in the perpendicular direction) and a transition from the Rouse plateau to the reptationlike plateau with -1.5 < alpha < -1 (the obstacles hinder the lateral motion of the polymer chains). However, with increase of the separation distance between obstacles, the confinement from the obstacles exhibits a decrease (more lateral motions of the polymer chains are allowed), which results in a higher plateau (no longer separate reptationlike dynamics). Our results clarify the effects of surface roughness on the diffusion mechanism of polymer chains strongly adsorbed on solid surfaces in dilute solutions and the resulting transition mechanism from the Rouse scaling to the reptationlike scaling, which is significant for the understanding of the physical nature and the development of the corresponding applications. |
| 语种 | 英语 |
| WOS记录号 | WOS:000432205300015 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/42747]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Ding, Mingming; Zhang, Ran; Shi, Tongfei |
| 作者单位 | 1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China 2.Univ Sci & Technol China, Sch Appl Chem & Engn, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Jiaxiang,Ding, Mingming,Zhang, Ran,et al. Effects of surface roughness on the self-diffusion dynamics of a single polymer[J]. SOFT MATTER,2018,14(18):3550-3556. |
| APA | Li, Jiaxiang,Ding, Mingming,Zhang, Ran,&Shi, Tongfei.(2018).Effects of surface roughness on the self-diffusion dynamics of a single polymer.SOFT MATTER,14(18),3550-3556. |
| MLA | Li, Jiaxiang,et al."Effects of surface roughness on the self-diffusion dynamics of a single polymer".SOFT MATTER 14.18(2018):3550-3556. |
入库方式： OAI收割
来源：化学研究所
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