arXiv: Soft Condensed Matter最新文献_第5页

Dielectrophoretic Force Equilibrium of Complex Particles 复杂粒子的介电泳力平衡

arXiv: Soft Condensed Matter Pub Date : 2020-07-02 DOI: 10.1103/PHYSREVAPPLIED.14.054047

T. Elkeles, P. García-Sánchez, Wu Yue, A. Ramos, G. Yossifon

引用次数: 1

Microphase separation in active filament systems maintained by cyclic dynamics of cluster size and order 由簇大小和顺序的循环动力学维持的有源灯丝系统中的微相分离

arXiv: Soft Condensed Matter Pub Date : 2020-07-01 DOI: 10.1103/PHYSREVRESEARCH.3.013280

L. Huber, T. Krüger, Erwin Frey

{"title":"Microphase separation in active filament systems maintained by cyclic dynamics of cluster size and order","authors":"L. Huber, T. Krüger, Erwin Frey","doi":"10.1103/PHYSREVRESEARCH.3.013280","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013280","url":null,"abstract":"The onset of polar flocking in active matter is discontinuous, akin to gas-liquid phase transitions, except that the steady state exhibits microphase separation into polar clusters. While these features have been observed in theoretical models and experiments, little is known about the underlying mesoscopic processes at the cluster level. Here we show that emergence and maintenance of polar order are governed by the interplay between the assembly and disassembly dynamics of clusters with varying size and degree of polar order. Using agent-based simulations of propelled filaments in a parameter regime relevant for actomyosin motility assays, we monitor the temporal evolution of cluster statistics and the transport processes of filaments between clusters. We find that, over a broad parameter range, the emergence of order is determined by nucleation and growth of polar clusters, where the nucleation threshold depends not only on the cluster size but also on its polar moment. Growth involves cluster self-replication, and polar order is established by cluster growth and fragmentation. Maintenance of the microphase-separated, polar-ordered state results from a cyclic dynamics in cluster size and order, driven by an interplay between cluster nucleation, coagulation, fragmentation and evaporation of single filaments. These findings are corroborated by a kinetic model for the cluster dynamics that includes these elementary cluster-level processes. It consistently reproduces the cluster statistics as well as the cyclic turnover from disordered to ordered clusters and back. Such cyclic kinetic processes could represent a general mechanism for the maintenance of order in active matter systems.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"120 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86136235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Rising and sinking intruders in dense granular flows 密集粒状流中上升和下沉的入侵者

arXiv: Soft Condensed Matter Pub Date : 2020-06-30 DOI: 10.1103/PHYSREVRESEARCH.2.022069

L. Jing, J. Ottino, Richard M. Lueptow, P. Umbanhowar

引用次数: 27

Caffeine modulates the dynamics of DODAB membranes: Role of the physical state of the bilayer 咖啡因调节DODAB膜动力学:双分子层物理状态的作用

arXiv: Soft Condensed Matter Pub Date : 2020-06-28 DOI: 10.1063/5.0027953

V. Sharma, H. Srinivasan, V. García Sakai, S. Mitra

{"title":"Caffeine modulates the dynamics of DODAB membranes: Role of the physical state of the bilayer","authors":"V. Sharma, H. Srinivasan, V. García Sakai, S. Mitra","doi":"10.1063/5.0027953","DOIUrl":"https://doi.org/10.1063/5.0027953","url":null,"abstract":"Caffeine (1,3,7-trimethylxanthine), an ingredient of coffee, is used worldwide as a psychostimulant, antioxidant, and adjuvant analgesic. To gain insights into the action mechanism of caffeine, we report on its effects on the phase behaviour and microscopic dynamics of a dioctadecyldimethylammonium bromide (DODAB) lipid membrane, as studied quasielastic neutron scattering (QENS). Tracking the elastic scattering intensity as a function of temperature showed that caffeine does not alter the phase behaviour of the DODAB membrane and that transition temperatures remain almost unaltered. However, QENS measurements revealed caffeine significantly modulates the microscopic dynamics of the lipids in the system, and that the effects depend on the structural arrangement of the lipids in the membrane. In the coagel phase, caffeine acts as a plasticizing agent which enhances the membrane dynamics. However, in the fluid phase the opposite effect is observed; caffeine behaves like a stiffening agent, restricting the lipid dynamics. Further analysis of the QENS data indicates that in the fluid phase, caffeine restricts both lateral and internal motions of the lipids in the membrane. The present study illustrates how caffeine regulates the fluidity of the membrane by modulating the dynamics of constituent lipids depending on the physical state of the bilayer.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87029652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Confinement-induced demixing and crystallization 禁锢诱导的脱混和结晶

arXiv: Soft Condensed Matter Pub Date : 2020-06-19 DOI: 10.1103/physrevresearch.2.033207

Gerhard Jung, Charlotte F. Petersen

引用次数: 9

Quantitatively consistent scale-spanning model for same-material tribocharging 相同材料摩擦充电的定量一致尺度跨越模型

arXiv: Soft Condensed Matter Pub Date : 2020-06-12 DOI: 10.1103/physrevmaterials.4.082602

G. Grosjean, S. Wald, J. Sobarzo, S. Waitukaitis

引用次数: 11

Memory effects in a gas of viscoelastic particles 粘弹性粒子气体中的记忆效应

arXiv: Soft Condensed Matter Pub Date : 2020-05-30 DOI: 10.1063/5.0050804

E. Mompó, M. A. López-Castaño, A. Lasanta, F. Vega Reyes, A. Torrente

{"title":"Memory effects in a gas of viscoelastic particles","authors":"E. Mompó, M. A. López-Castaño, A. Lasanta, F. Vega Reyes, A. Torrente","doi":"10.1063/5.0050804","DOIUrl":"https://doi.org/10.1063/5.0050804","url":null,"abstract":"We study a granular gas of viscoelastic particles, i.e, the kinetic energy loss upon collision, characteristic of granular materials, is a function of the particles relative velocities at impact. In order to characterize thermal memory in this system, we study the temperature relaxation curves when the granular gas is subject to sudden thermostat changes (the gas is heated homogeneously by means of a white noise). Results show that the system may display anomalous cooling and heating velocities at early times. In particular, a significant Mpemba effect is present; i.e., an initially hotter/cooler granular gas can cool down/heat up faster than an in comparison cooler/hotter granular gas. Moreover, a non-monotonic relaxation of the granular temperature can also be observed (also known as Kovacs effect) when the granular gas undergoes a certain protocol that sets it at a temperature equal to its long-time value. We study our system via three independent methods: theoretical solution, molecular dynamics simulations and exact numerical solution of the kinetic equation (obtained by means of the Direct Monte Carlo simulation method). We find a good agreement between all three methods.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85523357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Spiral defect chaos in Rayleigh-Bénard convection: Asymptotic and numerical studies of azimuthal flows induced by rotating spirals rayleigh - bassanard对流中的螺旋缺陷混沌:由旋转螺旋引起的方位角流动的渐近和数值研究

arXiv: Soft Condensed Matter Pub Date : 2020-05-30 DOI: 10.1103/physrevfluids.5.093501

Eduardo Vitral, S. Mukherjee, P. Leo, J. Viñals, M. Paul, Zhi-Feng Huang

{"title":"Spiral defect chaos in Rayleigh-Bénard convection: Asymptotic and numerical studies of azimuthal flows induced by rotating spirals","authors":"Eduardo Vitral, S. Mukherjee, P. Leo, J. Viñals, M. Paul, Zhi-Feng Huang","doi":"10.1103/physrevfluids.5.093501","DOIUrl":"https://doi.org/10.1103/physrevfluids.5.093501","url":null,"abstract":"Rotating spiral patterns in Rayleigh-Benard convection are known to induce azimuthal flows, which raises the question of how different neighboring spirals interact with each other in spiral chaos, and the role of hydrodynamics in this regime. Far from the core, we show that spiral rotations lead to an azimuthal body force that is irrotational and of magnitude proportional to the topological index of the spiral and its angular frequency. The force, although irrotational, cannot be included in the pressure field as it would lead to a nonphysical, multivalued pressure. We calculate the asymptotic dependence of the resulting flow, and show that it leads to a logarithmic dependence of the azimuthal velocity on distance r away from the spiral core in the limit of negligible damping coefficient. This solution dampens to approximately $1/r$ when accounting for no-slip boundary conditions for the convection cell's plate. This flow component can provide additional hydrodynamic interactions among spirals including those observed in spiral defect chaos. We show that the analytic prediction for the azimuthal velocity agrees with numerical results obtained from both two-dimensional generalized Swift-Hohenberg and three-dimensional Boussinesq models, and find that the velocity field is affected by the size and charges of neighboring spirals. Numerically, we identify a correlation between the appearance of spiral defect chaos and the balancing between the mean-flow advection and the diffusive dynamics related to roll unwinding.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88634324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

How does the presence of stevia glycosides impact surface bubbles stability? 甜菊糖苷的存在如何影响表面气泡的稳定性?

arXiv: Soft Condensed Matter Pub Date : 2020-05-27 DOI: 10.1016/j.colsurfa.2020.125093

Jonas Miguet, Yuan Fang, F. Rouyer, E. Rio

引用次数: 4

Surfing and crawling macroscopic active particles under strong confinement: Inertial dynamics 强约束下宏观活性粒子的冲浪和爬行:惯性动力学

arXiv: Soft Condensed Matter Pub Date : 2020-05-21 DOI: 10.1103/physrevresearch.2.043299

M. Leoni, M. Paoluzzi, Sarah Eldeen, A. Estrada, Lauren Nguyen, M. Alexandrescu, Karin Sherb, W. Ahmed

引用次数: 13