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Shape induced segregation and anomalous particle transport under spherical confinement
Singh, A1,2; Li, JY1; Jiang XK(蒋玺恺)1,3; Hernandez-Ortiz, JP4,5; Jaeger, HM2,6; de Pablo, JJ1,7
Corresponding Authorde Pablo, Juan J.(depablo@uchicago.edu)
Source PublicationPHYSICS OF FLUIDS
2020-05-01
Volume32Issue:5Pages:12
ISSN1070-6631
AbstractColloidal 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.
DOI10.1063/5.0002906
Indexed BySCI ; EI
Language英语
WOS IDWOS:000534365800001
WOS KeywordIMMERSED BOUNDARY METHOD ; STOKESIAN DYNAMICS ; DIFFUSION ; DETERMINANT ; MODEL ; SIZE ; FLOW
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding ProjectDepartment 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
Funding OrganizationDepartment 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
Classification一类/力学重要期刊
Ranking3
Contributorde Pablo, Juan J.
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/82076
Collection非线性力学国家重点实验室
Affiliation1.Univ Chicago, Pritzker Sch Mol Engn, Chicago, IL 60637 USA;
2.Univ Chicago, James Franck Inst, Chicago, IL 60637 USA;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
4.Univ Nacl Colombia Medellin, Dept Mat & Nanotechnol, Medellin 050034, Colombia;
5.Univ Nacl Colombia Medellin, Colombia Wisconsin One Hlth Consortium, Medellin 050034, Colombia;
6.Univ Chicago, Dept Phys, Chicago, IL 60637 USA;
7.Argonne Natl Lab, Mat Sci Div, Lemont, IL 60439 USA
Recommended Citation
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.
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