Shape induced segregation and anomalous particle transport under spherical confinement
文献类型：期刊论文
| 作者 | Singh, A6,7; Li, JY7; Jiang XK(蒋玺恺)5,7; Hernandez-Ortiz, JP3,4; Jaeger, HM2,6; de Pablo, JJ1,7 |
| 刊名 | PHYSICS OF FLUIDS
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 32期号:5页码:12 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0002906 |
| 通讯作者 | de Pablo, Juan J.(depablo@uchicago.edu) |
| 英文摘要 | Colloidal or nanoparticle mobility under confinement is of central importance for a wide range of physical and biological processes. Here, we introduce a minimal model of particles in a hydrodynamic continuum to examine how particle shape and concentration affect the transport of particles in spherical confinement. Specifically, an immersed boundary-general geometry Ewald-like approach is adopted to simulate the dynamics of spheres and cylinders under the influence of short- and long-range fluctuating hydrodynamic interactions with appropriate non-slip conditions at the confining walls. An efficient O(N) parallel finite element algorithm is used, thereby allowing simulations at high concentrations, while a Chebyshev polynomial approximation is implemented in order to satisfy the fluctuation-dissipation theorem. A concentration-dependent anomalous diffusion is observed for suspended particles. It is found that introducing cylinders in a background of spheres, i.e., particles with a simple degree of anisotropy, has a pronounced influence on the structure and dynamics of the particles. First, increasing the fraction of cylinders induces a particle segregation effect, where spheres are pushed toward the wall and cylinders remain near the center of the cavity. This segregation leads to a lower mobility for the spheres relative to that encountered in a system of pure spheres at the same volume fraction. Second, the diffusive-to-anomalous transition and the degree of anomaly quantified by the power law exponent in the mean square displacement vs time relation both increase as the fraction of cylinders becomes larger. These findings are of relevance for studies of diffusion in the cytoplasm, where proteins exhibit a distribution of size and shapes that could lead to some of the effects identified in the simulations reported here. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | IMMERSED BOUNDARY METHOD ; STOKESIAN DYNAMICS ; DIFFUSION ; DETERMINANT ; MODEL ; SIZE ; FLOW |
| 资助项目 | Department of Energy, Basic Energy Sciences, Division of Materials Research, through the MICCoM center[DOE-SC0008631] ; Department of Energy, Basic Energy Sciences, Division of Materials Research, through the AMEWS Center |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000534365800001 |
| 资助机构 | Department of Energy, Basic Energy Sciences, Division of Materials Research, through the MICCoM center ; Department of Energy, Basic Energy Sciences, Division of Materials Research, through the AMEWS Center |
| 其他责任者 | de Pablo, Juan J. |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/82075]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Argonne Natl Lab, Mat Sci Div, Lemont, IL 60439 USA 2.Univ Chicago, Dept Phys, Chicago, IL 60637 USA; 3.Univ Nacl Colombia Medellin, Colombia Wisconsin One Hlth Consortium, Medellin 050034, Colombia; 4.Univ Nacl Colombia Medellin, Dept Mat & Nanotechnol, Medellin 050034, Colombia; 5.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 6.Univ Chicago, James Franck Inst, Chicago, IL 60637 USA; 7.Univ Chicago, Pritzker Sch Mol Engn, Chicago, IL 60637 USA; |
| 推荐引用方式 GB/T 7714 | Singh, A,Li, JY,Jiang XK,et al. Shape induced segregation and anomalous particle transport under spherical confinement[J]. PHYSICS OF FLUIDS,2020,32(5):12. |
| APA | Singh, A,Li, JY,蒋玺恺,Hernandez-Ortiz, JP,Jaeger, HM,&de Pablo, JJ.(2020).Shape induced segregation and anomalous particle transport under spherical confinement.PHYSICS OF FLUIDS,32(5),12. |
| MLA | Singh, A,et al."Shape induced segregation and anomalous particle transport under spherical confinement".PHYSICS OF FLUIDS 32.5(2020):12. |
入库方式： OAI收割
来源：力学研究所
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