arXiv: Soft Condensed Matter

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#1Mohammed A. AbdelazizH-Index: 1

#2Jairo A. DiazH-Index: 5

Last. Mauricio HoyosH-Index: 11

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Emulsion droplets trapped in an ultrasonic levitator behave in two ways that solid spheres do not: (1) Individual droplets spin rapidly about an axis parallel to the trapping plane, and (2) coaxially spinning droplets form long chains aligned with their common axis of rotation. Acoustically-organized chains interact hydrodynamically, either to merge into longer chains or to form three-dimensional bundles of chains. Solid spheres, by contrast, form close-packed planar crystals drawn together by t...

#1Matteo PaoluzziH-Index: 16

#2Luca AngelaniH-Index: 28

Last. Giancarlo RuoccoH-Index: 71

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Experimental evidence shows that there is a feedback between cell shape and cell motion. How this feedback impacts the collective behavior of dense cell monolayers remains an open question. We investigate the effect of a feedback that tends to align the cell crawling direction with cell elongation in a biological tissue model. We find that the alignment interaction promotes nematic patterns in the fluid phase that eventually undergo a non-equilibrium phase transition into a quasi-hexagonal solid...

#1Meng Liu (ETH Zurich)

#2Christoph R. MüllerH-Index: 44

Last. Christoph R. Müller

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We report a new lift force model for intruders in dense, granular shear flows. Our derivation is based on the thermal buoyancy model of Trujillo & Hermann[L. Trujillo and H. J. Herrmann, Physica A 330, 519 (2003).], but takes into account both granular temperature and pressure differences in the derivation of the net buoyancy force acting on the intruder. In a second step the model is extended to take into account also density differences between the intruder and the bed particles. The model pre...

#1Rubén Gómez GonzálezH-Index: 3

#2Vicente GarzóH-Index: 30

The time evolution of a homogeneous bidisperse granular suspension is studied in the context of the Enskog kinetic equation. The influence of the surrounding viscous gas on the solid particles is modeled via a deterministic viscous drag force plus a stochastic Langevin-like term. It is found first that, regardless of the initial conditions, the system reaches (after a transient period lasting a few collisions per particle) a universal unsteady hydrodynamic regime where the distribution function ...

#1Edward Smith (Brunel University London)H-Index: 9

The local pressure tensor is non-unique, a fact which has generated confusion and debate in the seventy years since the seminal work by Irving Kirkwood. This non-uniqueness is normally attributed to the interaction path between molecules, especially in the interfacial-science community. In this work we reframe this discussion of non-uniqueness in terms of the location, or reference frame, used to measure the pressure. By using a general mathematical description of the liquid-vapour interface, we...

Last. Rudolf PodgornikH-Index: 45

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We model a cholesteric liquid crystal as a planar uniaxial multilayer system, where the orientation of each layer differs slightly from that of the adjacent one. This allows us to analytically simplify the otherwise acutely complicated calculation of the Casimir-Lifshitz torque. Numerical results differ appreciably from the case of nematic liquid crystals, which can be treated like bloc birefringent media. In particular, we find that the torque deviates considerably from its usual sinusoidal beh...

#1Daniel J. O'BrienH-Index: 4

#2Makarand ParanjapeH-Index: 22

Hypothesis: Surfactants are often added to aqueous solutions to induce spreading on otherwise unwettable hydrophobic surfaces. Alternatively, they can be introduced directly into solid hydrophobic materials-such as the soft elastomer, polydimethylsiloxane-to induce autonomous spreading without requiring additional surface or liquid modifications. Given the similarity between mechanisms of these two approaches, models that describe wetting by aqueous surfactant solutions should also characterize ...

#1Ireth García-Aguilar (LEI: Leiden University)H-Index: 5

#2Ayelet Atkins (BIU: Bar-Ilan University)H-Index: 10

Last. Luca Giomi (LEI: Leiden University)H-Index: 25

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In their Comment [arXiv:2102.03842], Haas et al. advance two hypotheses on the nature of the shape transformations observed in surfactant-stabilized emulsion droplets, as the theoretical models that us [Phys. Rev. Lett. 126, 038001 (2021)] and others [P. A. Haas et al. Phys. Rev. Lett. 118, 088001 (2017), Phys. Rev. Research 1, 023017 (2019)] have introduced to account for these observations. (1) Because of the different surfactants used in experimental studies, the physical mechanisms underpinn...

#1Xiangxin DangH-Index: 2

#2Fan FengH-Index: 5

Last. Jianxiang Wang (PKU: Peking University)H-Index: 27

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The concept of kirigami has been extensively utilized to design deployable structures and reconfigurable metamaterials. Despite heuristic utilization of classical kirigami patterns, the gap between complex kirigami tessellations and systematic design principles still needs to be filled. In this paper, we develop a unified design method for deployable quadrilateral kirigami tessellations perforated on flat sheets with different topologies. This method is based on the parameterization of kirigami ...

#1Takeshi FujiyabuH-Index: 5

#2Takamasa SakaiH-Index: 36

Last. Naoyuki SakumichiH-Index: 6

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The swelling dynamics of polymer gels are characterized by the (collective) diffusion coefficient of the polymer network. Here, we measure the temperature dependence of the diffusion coefficients of polymer gels with controlled homogeneous network structures using dynamic light scattering. By developing the procedure for decomposing the diffusion coefficient into mixing and elastic contributions, we find that the elastic contribution is a linear function of the absolute temperature with a signif...

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