globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1721324115
论文题名:
A random first-order transition theory for an active glass
作者: Nandi S.K.; Mandal R.; Bhuyan P.J.; Dasgupta C.; Rao M.; Gov N.S.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:30
起始页码: 7688
结束页码: 7693
语种: 英语
英文关键词: Active glass ; Active RFOT ; Dense self-propelled particle system ; Fragility ; Persistence time
Scopus关键词: active glass ; Article ; cell activity ; cell granule ; controlled study ; entropy ; glass transition temperature ; karyotype ; microscopy ; molecular dynamics ; osmotic fragility ; prediction ; priority journal ; process model ; protein assembly ; random first-order transition theory ; simulation
英文摘要: How does nonequilibrium activity modify the approach to a glass? This is an important question, since many experiments reveal the near-glassy nature of the cell interior, remodeled by activity. However, different simulations of dense assemblies of active particles, parametrized by a self-propulsion force, f0, and persistence time, τp, appear to make contradictory predictions about the influence of activity on characteristic features of glass, such as fragility. This calls for a broad conceptual framework to understand active glasses; here, we extend the random first-order transition (RFOT) theory to a dense assembly of self-propelled particles. We compute the active contribution to the configurational entropy through an effective model of a single particle in a caging potential. This simple active extension of RFOT provides excellent quantitative fits to existing simulation results. We find that whereas f0 always inhibits glassiness, the effect of τp is more subtle and depends on the microscopic details of activity. In doing so, the theory automatically resolves the apparent contradiction between the simulation models. The theory also makes several testable predictions, which we verify by both existing and new simulation data, and should be viewed as a step toward a more rigorous analytical treatment of active glass. © 2018 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163685
Appears in Collections:气候变化与战略

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作者单位: Nandi, S.K., Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel; Mandal, R., Department of Physics, Indian Institute ofScience, Bangalore, 560012, India, Simons Centre for the Study of Living Machines, National Centre for Biological Sciences, Tata Institute of FundamentalResearch, Bangalore, 560065, India; Bhuyan, P.J., Department of Physics, Indian Institute ofScience, Bangalore, 560012, India; Dasgupta, C., Department of Physics, Indian Institute ofScience, Bangalore, 560012, India, Statistical Physics and Condensed Matter Group, International Centre for Theoretical Sciences, Bangalore, 560089, India; Rao, M., Simons Centre for the Study of Living Machines, National Centre for Biological Sciences, Tata Institute of FundamentalResearch, Bangalore, 560065, India; Gov, N.S., Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel

Recommended Citation:
Nandi S.K.,Mandal R.,Bhuyan P.J.,et al. A random first-order transition theory for an active glass[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(30)
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