arXiv: Soft Condensed Matter最新文献_第10页

Aging of Thermoreversible Gel of Associating Polymers. 缔合聚合物热可逆凝胶的老化研究。

arXiv: Soft Condensed Matter Pub Date : 2020-02-02 DOI: 10.1021/acs.macromol.0c00258.s003

Kulveer Singh, Y. Rabin

引用次数: 0

Elastic Properties, Yield Surface and Flow Rule of Nanopowder Compacts 纳米粉末压块的弹性性能、屈服面及流动规律

arXiv: Soft Condensed Matter Pub Date : 2020-01-31 DOI: 10.18720/MPM.4412020_16

G. Boltachev, E. Chingina, N. Volkov, K. Lukyashin

引用次数: 0

On the stress overshoot in cluster crystals under shear 剪切作用下簇状晶体应力超调的研究

arXiv: Soft Condensed Matter Pub Date : 2020-01-30 DOI: 10.5488/CMP.23.23801

G. Shrivastav, G. Kahl

{"title":"On the stress overshoot in cluster crystals under shear","authors":"G. Shrivastav, G. Kahl","doi":"10.5488/CMP.23.23801","DOIUrl":"https://doi.org/10.5488/CMP.23.23801","url":null,"abstract":"Using non-equilibrium molecular dynamics simulations we study the yielding behaviour of a model cluster crystal formed by ultrasoft particles under shear. We investigate the evolution of stress as a function of strain for different shear rates, $dot{gamma}$, and temperatures. The stress-strain relation displays a pronounced maximum at the yielding point; the height of this maximum, $sigma_text{p}$, increases via a power law with an increasing shear range and tends to saturate to a finite value if the limit shear rate goes to zero (at least within the considered temperature range). Interestingly, this behaviour can be captured by the Herschel-Bulkley type model which, for a given temperature, allows us to predict a static yield stress $sigma^{0}_text{p}$ (in the shear rate tending to zero limit), a characteristic timescale $tau_text{c}$, and the exponent $alpha$ of the above-mentioned power-law decay of the $sigma_text{p}$ at high shear rates. Furthermore, for different temperatures, the $sigma_text{p}$ can be scaled as functions of $dot{gamma}$ onto a single master curve when scaled by corresponding $tau_text{c}$ and ${sigma}_text{p}^{0}$. Moreover, for a given shear rate, $sigma_text{p}$ displays a logarithmic dependence on temperature. Again, the $sigma_text{p}{-}T$ curves for different shear rates can be scaled on a single logarithmic master curve when scaled by a corresponding fitting parameters.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"17 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83152196","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

Collective vibrations of confined levitating droplets 受限制的悬浮液滴的集体振动

arXiv: Soft Condensed Matter Pub Date : 2020-01-24 DOI: 10.1103/PHYSREVFLUIDS.5.083601

Stuart A. J. Thomson, M. Couchman, J. M. Bush

引用次数: 19

Domain walls in vertically vibrated monolayers of cylinders confined in annuli 环空中圆柱体垂直振动单层中的畴壁

arXiv: Soft Condensed Matter Pub Date : 2020-01-22 DOI: 10.1103/PHYSREVRESEARCH.2.033436

A. Armas, M. Maza-Cuello, Y. Martínez-Ratón, E. Velasco

{"title":"Domain walls in vertically vibrated monolayers of cylinders confined in annuli","authors":"A. Armas, M. Maza-Cuello, Y. Martínez-Ratón, E. Velasco","doi":"10.1103/PHYSREVRESEARCH.2.033436","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.033436","url":null,"abstract":"Liquid-crystalline ordering in vertically vibrated granular monolayers confined in annuli of different sizes is examined. The annuli consist of circular cavities with a central circular obstruction. In the absence of the central obstruction cylinders of low aspect-ratio exhibit tetratic order, except for the existence of four defects which restore the symmetry broken by the circular confinement. This behaviour is demanded by topology in systems with strong anchoring properties at the surface. By contrast, topology dictates that the annular geometry is compatible with a distorted tetratic phase without point defects. However, the effect of restricted geometry and limited size on phases possessing finite anchoring energy at the wall and elastic stiffness leads to different configurations, showing finite ordered regions separated by domain walls. We argue that highly packed nonequilibrium vibrated granular monolayers respond to geometrical frustration and extreme confinement as corresponding equilibrium systems of particles do, and that the former can be analysed in terms of surface free energies, elastic distortions and defects, much as equilibrium liquid crystals. Therefore, selective confinement of vertically-vibrated monolayers of rods could be used with advantage as a new tool to study the creation and dynamics of various types of defects in ordered systems.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77767532","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

Thermophoresis in Liquids and its Connection to Equilibrium Quantities 液体热泳进及其与平衡量的关系

arXiv: Soft Condensed Matter Pub Date : 2020-01-15 DOI: 10.18452/21036

B. Maier

{"title":"Thermophoresis in Liquids and its Connection to Equilibrium Quantities","authors":"B. Maier","doi":"10.18452/21036","DOIUrl":"https://doi.org/10.18452/21036","url":null,"abstract":"Thermophoresis is the process of particles moving along a temperature gradient in thermodynamic systems. Even though it has been studied for over 150 years, there is neither a complete theoretical description of thermophoresis in liquids nor of the Soret coefficient, the quantifiying measure of the Soret equilibrium. Recent studies connect its nature to equilibrium properties of the system, namely the excess enthalpy and the excess entropy, while there is still a debate over which of both describes the Soret coefficient more accurately and whether it can even be represented using those quantities. In this work I present a theoretical description for both cases based on density analysis by means of Brownian motion and dynamical density functional theory, where I assume local equilibrium. The interpretation of the Brownian stochastic differential equation (SDE) as an Ito or Stratonovich SDE is shown to have an influence on the outcome of the density. I argue that a Soret coefficient proportional to the excess enthalpy is connected to a system in a thermal gradient following its equation of state. Furthermore, I derive that the Boltzmann distribution law for external potentials does not hold for systems in thermal gradients but has to be replaced by a more general quantity. The theoretical predictions are consequently tested by means of BD simulations, where several systems are shown to follow their equation of state. The Soret coefficient of a solute in a toy model solvent is shown to be proportional to the solute's equilibrium solvation enthalpy. I further attempt to verify the theoretic derivations by means of MD simulations of noble gas solutes in SPC/E water. While the Soret equilibrium SPC/E water density follows its equation of state, neither Soret coefficient nor Soret equilibrium solute densitie entail a coherent agreement with any of the theoretical predictions.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80489608","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: 0

Effects of fluctuations on correlation functions in inhomogeneous mixtures 波动对非均匀混合物中相关函数的影响

arXiv: Soft Condensed Matter Pub Date : 2020-01-08 DOI: 10.5488/CMP.23.23601

A. Ciach, O. Patsahan, A. Meyra

引用次数: 5

Negative Energy Elasticity in a Rubberlike Gel 橡胶状凝胶的负能量弹性

arXiv: Soft Condensed Matter Pub Date : 2019-12-31 DOI: 10.1103/PHYSREVX.11.011045

Yuki Yoshikawa, N. Sakumichi, U. Chung, T. Sakai

{"title":"Negative Energy Elasticity in a Rubberlike Gel","authors":"Yuki Yoshikawa, N. Sakumichi, U. Chung, T. Sakai","doi":"10.1103/PHYSREVX.11.011045","DOIUrl":"https://doi.org/10.1103/PHYSREVX.11.011045","url":null,"abstract":"Rubber elasticity is the archetype of the entropic force emerging from the second law of thermodynamics; numerous experimental and theoretical studies on natural and synthetic rubbers have shown that the elasticity originates mostly from entropy change with deformation. Similarly, polymer gels containing a large amount of solvent have also been postulated that the shear modulus $G$, which is a kind of modulus of elasticity, is approximately equivalent to the entropy contribution $G_S$, but this has yet to be verified experimentally. In this study, we measure the temperature dependence of the shear modulus $G$ in a rubber-like (hyperelastic) polymer gel whose polymer volume fraction is at most 0.1. As a result, we find that the energy contribution $G_E=G-G_S$ can be a significant negative value, reaching up to double the shear modulus $G$ (i.e., $left|G_Eright| simeq 2G$), although the shear modulus of stable materials is generally bound to be positive. We further argue that the energy contribution $G_E$ is governed by a vanishing temperature that is a universal function of the normalized polymer concentration, and $G_E$ vanishes when the solvent is removed. Our findings highlight the essential difference between rubber elasticity and gel elasticity, which were previously thought to be the same, and push an established field of gel elasticity into a new direction.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88376942","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: 19

Statistics of Quenched Defects Containing Semi-Flexible Polymer Chain Exact Results (II) 含半柔性聚合物链的淬火缺陷统计(II)

arXiv: Soft Condensed Matter Pub Date : 2019-12-31 DOI: 10.26438/ijsrpas/v7i6.1923

Pramod Kumar Mishra

{"title":"Statistics of Quenched Defects Containing Semi-Flexible Polymer Chain Exact Results (II)","authors":"Pramod Kumar Mishra","doi":"10.26438/ijsrpas/v7i6.1923","DOIUrl":"https://doi.org/10.26438/ijsrpas/v7i6.1923","url":null,"abstract":"We describe method to discuss thermodynamics of a defected semi-flexible homo-polymer chain in the two and three dimensions using fully directed self-avoiding walk lattice model. The defects are located along a line and these defects are not in the thermal equilibrium with the monomers of the semi-flexible polymer chain; i. e. we consider the case of defected semi-flexible polymer chain in the present manuscript for the case of quenched defects. There are m defects on the conformations of the N monomers long semi-flexible polymer chain and we exactly count the number of Q realizations of the defected conformations of N-monomers long self-avoiding semi-flexible polymer chain; and thus we derive the exact expression of the free energy of the defected semi-flexible polymer chain for the finite length (i. e. using the fixed particle ensemble method); and we also derive exact expression of the partition function for the defected self-avoiding semi-flexible polymer chain in the thermodynamic limit using the grand canonical ensemble theory. The method described in this manuscript may be easily extended to another case of the defected polymer chain for isotropic/directed walk lattice models.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87987041","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: 0

Non-Hermitian topological metamaterials with odd elasticity 具有奇弹性的非厄米拓扑超材料

arXiv: Soft Condensed Matter Pub Date : 2019-12-20 DOI: 10.1103/PHYSREVRESEARCH.2.023173

Di Zhou, Junyi Zhang

引用次数: 27