arXiv - PHYS - Soft Condensed Matter最新文献_第6页

Microscopic Structural Study on the Growth History of Granular Heaps Prepared by the Raining Method 雨淋法制备的颗粒堆生长历史的显微结构研究

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-30 DOI: arxiv-2408.17147

Hanyu Li, Houfei Yuan, Zhikun Zeng, Shuyang Zhang, Chijin Zhou, Xinyu Ai, Yujie Wang

{"title":"Microscopic Structural Study on the Growth History of Granular Heaps Prepared by the Raining Method","authors":"Hanyu Li, Houfei Yuan, Zhikun Zeng, Shuyang Zhang, Chijin Zhou, Xinyu Ai, Yujie Wang","doi":"arxiv-2408.17147","DOIUrl":"https://doi.org/arxiv-2408.17147","url":null,"abstract":"Granular heaps are critical in both industrial applications and natural\u0000processes, exhibiting complex behaviors that have sparked significant research\u0000interest. The stress dip phenomenon observed beneath granular heaps continues\u0000to be a topic of significant debate. Current models based on force transmission\u0000often assume that the packing is near the isostatic point, overlooking the\u0000critical influence of internal structure and formation history on the\u0000mechanical properties of granular heaps. Consequently, these models fail to\u0000fully account for diverse observations. In this study, we experimentally\u0000explore the structural evolution of three dimensional (3D) granular heaps\u0000composed of monodisperse spherical particles prepared using the raining method.\u0000Our results reveal the presence of two distinct regions within the heaps,\u0000characterized by significant differences in structural properties such as\u0000packing fraction, contact number, and contact anisotropy. We attribute these\u0000structural variations to the differing formation mechanisms during heap growth.\u0000Our findings emphasize the substantial influence of the preparation protocols\u0000on the internal structure of granular heaps and provide valuable insights into\u0000stress distribution within granular materials. This research may contribute to\u0000the development of more accurate constitutive relations for granular materials\u0000by informing and refining future modeling approaches","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220674","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

Molecular anatomy of the pressure anisotropy in the interface of one and two component fluids: local thermodynamic description of the interfacial tension 单组分和双组分流体界面压力各向异性的分子解剖：界面张力的局部热力学描述

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-30 DOI: arxiv-2408.17038

Takeshi Omori, Yasutaka Yamaguchi

引用次数: 0

Structural transitions of a Semi-Flexible Polyampholyte 半柔性聚酰胺的结构转变

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15921

Rakesh Palariya, Sunil P. Singh

{"title":"Structural transitions of a Semi-Flexible Polyampholyte","authors":"Rakesh Palariya, Sunil P. Singh","doi":"arxiv-2408.15921","DOIUrl":"https://doi.org/arxiv-2408.15921","url":null,"abstract":"Polyampholytes (PA) are charged polymers composed of positively and\u0000negatively charged monomers along their backbone. The sequence of the charged\u0000monomers and the bending of the chain significantly influence the conformation\u0000and dynamical behavior of the PA. Using coarse-grained molecular dynamics\u0000simulations, we comprehensively study the structural and dynamical properties\u0000of flexible and semi-flexible polyampholytes'. The simulation results\u0000demonstrate a flexible polyampholyte (PA) chain, displaying a transition from a\u0000coil to a globule in the parameter space of the charge sequence. Additionally,\u0000the behavior of the mean-square displacement (MSD), denoted as $<(Delta\u0000r(t))^2>$, reveals distinct dynamics, specifically for the alternating and\u0000charge-segregated sequences. The MSD follows a power-law behavior, where\u0000$<(Delta r(t))^2> sim t^beta$, with $beta approx 3/5$ and $beta approx\u00001/2$ for the alternating sequence and charge-segregated sequence in the absence\u0000of hydrodynamic interactions, respectively. However, when hydrodynamic\u0000interactions are incorporated, the exponent $beta$ shifts to approximately 3/5\u0000for the charge-segregated sequence and 2/3 for the well-mixed alternating\u0000sequence. For a semi-flexible PA chain, varying the bending rigidity and\u0000electrostatic interaction strength ($Gamma_e$) leads to distinct, fascinating\u0000conformational states, including globule, bundle, and torus-like conformations.\u0000We show that PA acquires circular and hairpin-like conformations in the\u0000intermediate bending regime. The transition between various conformations is\u0000identified in terms of the shape factor estimated from the ratios of\u0000eigenvalues of the gyration tensor.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220676","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

Direct measurement of surface interactions experienced by sticky microcapsules made from environmentally benign materials 直接测量无害环境材料制成的粘性微胶囊所经历的表面相互作用

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15945

Hairou Yu, Christopher L. Wirth

{"title":"Direct measurement of surface interactions experienced by sticky microcapsules made from environmentally benign materials","authors":"Hairou Yu, Christopher L. Wirth","doi":"arxiv-2408.15945","DOIUrl":"https://doi.org/arxiv-2408.15945","url":null,"abstract":"We present a study combining experimental measurements, theoretical analysis,\u0000and simulations to investigate core-shell microcapsules interacting with a\u0000solid boundary, with a particular focus on understanding the short-range\u0000potential energy well arising from the tethered force. The microcapsules,\u0000fabricated using a Pickering emulsion template with a cinnamon oil core and\u0000calcium alginate shell, were characterized for size (5-6 microns in diameter)\u0000and surface charge (-20 mV). We employed total internal reflection microscopy\u0000and particle tracking to measure the microcapsule-boundary interactions and\u0000diffusion, from which potential energy and diffusivity profiles were derived.\u0000The potential energy profile was analyzed and simulated by considering\u0000electrostatic, gravitational, and tethered forces, while the diffusivity was\u0000compared to that of a solid particle-boundary interaction, inclusive of\u0000hydrodynamic forces. The diffusivity was represented as a normalized diffusion\u0000coefficient to eliminate the impact of fluid viscosity. The normalized\u0000diffusion coefficient of polymer-shell microcapsules (0.02) was found to be an\u0000order of magnitude smaller than that of solid polystyrene particles (0.2). The\u0000microcapsule sampled a potential well consisting of two distinct minima, as\u0000observed experimentally and supported by analytical expressions and Brownian\u0000dynamics simulations. A critical tethered height (49.8 nm) and the alginate\u0000radius of (35.2 nm) were obtained from fitting our model to experimental data.\u0000This work concludes that these benign core shell microcapsules interact with a\u0000nearby boundary via a transient tethering interaction, overall producing a mild\u0000sticky interaction that would likely be beneficial for applications in consumer\u0000products.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220819","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

There is Nothing Anomalous about 'Anomalous' Underscreening in Concentrated Electrolytes 浓缩电解质中的 "异常 "筛分不足并不反常

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15685

Sophie Baker, Gareth R. Elliott, Erica J. Wanless, Grant B. Webber, Vincent S. J. Craig, Alister J. Page

{"title":"There is Nothing Anomalous about 'Anomalous' Underscreening in Concentrated Electrolytes","authors":"Sophie Baker, Gareth R. Elliott, Erica J. Wanless, Grant B. Webber, Vincent S. J. Craig, Alister J. Page","doi":"arxiv-2408.15685","DOIUrl":"https://doi.org/arxiv-2408.15685","url":null,"abstract":"Over the last decade, experimental measurements of electrostatic screening\u0000lengths in concentrated electrolytes have exceeded theoretical predictions by\u0000orders of magnitude. This disagreement has led to a paradigm in which such\u0000screening lengths are referred to as 'anomalous underscreening', while others -\u0000predominantly those predicted by theory and molecular simulation - are referred\u0000to as 'normal underscreening'. Herein we use discrete Fourier analysis of the\u0000radial charge density obtained from molecular dynamics simulations to reveal\u0000the origin of anomalous underscreening in concentrated electrolytes. Normal\u0000underscreening above the Kirkwood point arises from low-frequency decay modes\u0000of the electrostatic potential, while anomalous underscreening arises from\u0000high-frequency decay modes that are observed only at high concentrations. The\u0000screening length associated with a particular decay mode is in turn determined\u0000by the degree of short-range interference between ion-ion correlation\u0000functions. The long-range decay associated with anomalous underscreening is\u0000thus ultimately determined by short range structure in the bulk electrolyte.\u0000These results reconcile the disagreement between experimental measurements and\u0000theoretical predictions of screening lengths in concentrated electrolytes.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220679","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

Classifying topological floppy modes in the continuum 连续体中拓扑软模的分类

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15850

Ian Tan, Anton Souslov

{"title":"Classifying topological floppy modes in the continuum","authors":"Ian Tan, Anton Souslov","doi":"arxiv-2408.15850","DOIUrl":"https://doi.org/arxiv-2408.15850","url":null,"abstract":"In floppy mechanical lattices, robust edge states and bulk Weyl modes are\u0000manifestations of underlying topological invariants. To explore the\u0000universality of these phenomena independent of microscopic detail, we formulate\u0000topological mechanics in the continuum. By augmenting standard linear\u0000elasticity with additional fields of soft modes, we define a continuum version\u0000of Maxwell counting, which balances degrees of freedom and mechanical\u0000constraints. With one additional field, these augmented elasticity theories can\u0000break spatial inversion symmetry and harbor topological edge states. We also\u0000show that two additional fields are necessary to harbor Weyl points in two\u0000dimensions, and define continuum invariants to classify these states. In\u0000addition to constructing the general form of topological elasticity based on\u0000symmetries, we derive the coefficients based on the systematic homogenization\u0000of microscopic lattices. By solving the resulting partial differential\u0000equations, we efficiently predict coarse-grained deformations due to\u0000topological floppy modes without the need for a detailed lattice-based\u0000simulation. Our discovery formulates novel design principles and efficient\u0000computational tools for topological states of matter, and points to their\u0000experimental implementation in mechanical metamaterials.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227386","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

Polar order in a fluid like ferroelectric with a tilted lamellar structure -- observation of a polar smectic C (SmC${_textrm{P}}$) phase 具有倾斜片层结构的类流体铁电中的极性秩序--观察到极性 Smectic C (SmC${_textrm{P}}$) 相

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15859

Jordan Hobbs, Calum J. Gibb, Damian Pociecha, Jadwiga Szydłowska, Ewa Górecka, Richard. J. Mandle

{"title":"Polar order in a fluid like ferroelectric with a tilted lamellar structure -- observation of a polar smectic C (SmC${_textrm{P}}$) phase","authors":"Jordan Hobbs, Calum J. Gibb, Damian Pociecha, Jadwiga Szydłowska, Ewa Górecka, Richard. J. Mandle","doi":"arxiv-2408.15859","DOIUrl":"https://doi.org/arxiv-2408.15859","url":null,"abstract":"The discovery of fluid states of matter with spontaneous bulk polar order is\u0000appreciated as a major discovery in the fields of soft matter and liquid\u0000crystals. Typically, this manifests as polar order superimposed atop\u0000conventional phase structures and is thus far limited to orthogonal phase\u0000types. Here we report a family of materials which exhibit a previously unseen\u0000state of matter which we conclude is a polar smectic C phase, and so we term it\u0000SmC${_textrm{P}}$. The spontaneous polarisation of the SmC${_textrm{P}}$\u0000phase is over two orders of magnitude larger than that found in conventional\u0000ferroelectric SmC phase of chiral materials used in some LCD devices. Fully\u0000atomistic molecular dynamics simulations faithfully and spontaneously reproduce\u0000the proposed structure and associated bulk properties; comparison of\u0000experimental and simulated X-ray scattering patterns shows excellent agreement.\u0000The materials disclosed here have significantly smaller dipole moments than\u0000typical polar liquid crystals such as RM734 which suggests the role of\u0000molecular electrical polarity in generating polar order is perhaps overstated,\u0000a view supported by consideration of other molecular systems.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227871","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

Neural density functional theory of liquid-gas phase coexistence 液-气相共存的神经密度泛函理论

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-28 DOI: arxiv-2408.15835

Florian Sammüller, Matthias Schmidt, Robert Evans

{"title":"Neural density functional theory of liquid-gas phase coexistence","authors":"Florian Sammüller, Matthias Schmidt, Robert Evans","doi":"arxiv-2408.15835","DOIUrl":"https://doi.org/arxiv-2408.15835","url":null,"abstract":"We use supervised machine learning together with the concepts of classical\u0000density functional theory to investigate the effects of interparticle\u0000attraction on the pair structure, thermodynamics, bulk liquid-gas coexistence,\u0000and associated interfacial phenomena in many-body systems. Local learning of\u0000the one-body direct correlation functional is based on Monte Carlo simulations\u0000of inhomogeneous systems with randomized thermodynamic conditions, randomized\u0000planar shapes of the external potential, and randomized box sizes. Focusing on\u0000the prototypical Lennard-Jones system, we test predictions of the resulting\u0000neural attractive density functional across a broad spectrum of physical\u0000behaviour associated with liquid-gas phase coexistence in bulk and at\u0000interfaces. We analyse the bulk radial distribution function $g(r)$ obtained\u0000from automatic differentiation and the Ornstein-Zernike route and determine i)\u0000the Fisher-Widom line, i.e. the crossover of the asymptotic (large distance)\u0000decay of $g(r)$ from monotonic to oscillatory, ii) the (Widom) line of maximal\u0000correlation length, iii) the line of maximal isothermal compressibility and iv)\u0000the spinodal by calculating the poles of the structure factor in the complex\u0000plane. The bulk binodal and the density profile of the free liquid-gas\u0000interface are obtained from density functional minimization and the\u0000corresponding surface tension from functional line integration. We also show\u0000that the neural functional describes accurately the phenomena of drying at a\u0000hard wall and of capillary evaporation for a liquid confined in a slit pore.\u0000Our neural framework yields results that improve significantly upon standard\u0000mean-field treatments of interparticle attraction. Comparison with independent\u0000simulation results demonstrates a consistent picture of phase separation even\u0000when restricting the training to supercritical states only.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220677","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

Transients in shear thickening suspensions: when hydrodynamics matters 剪切增稠悬浮液中的瞬态：流体力学的重要性

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-27 DOI: arxiv-2408.15130

Shivakumar Athani, Bloen Metzger, Yoël Forterre, Romain Mari

引用次数: 0

Phase behavior of symmetric diblock copolymers under 3D soft confinement 三维软约束下对称二嵌段共聚物的相行为

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-27 DOI: arxiv-2408.14863

Zhijuan He, Jin Huang, Kai Jiang, An-Chang Shi

{"title":"Phase behavior of symmetric diblock copolymers under 3D soft confinement","authors":"Zhijuan He, Jin Huang, Kai Jiang, An-Chang Shi","doi":"arxiv-2408.14863","DOIUrl":"https://doi.org/arxiv-2408.14863","url":null,"abstract":"The phase behavior of symmetric diblock copolymers under three-dimensional\u0000(3D) soft confinement is investigated using the self-consistent field theory.\u0000The soft confinement is realized in binary blends composed AB diblock\u0000copolymers and C homopolymers, where the copolymers self-assemble to form a\u0000droplet embedded in the homopolymer matrix. The phase behavior of the confined\u0000block copolymers is regulated by the degree of confinement and the selectivity\u0000of the homopolymers, resulting in a rich variety of novel structures. When the\u0000C homopolymers are neutral to the A- and B-blocks, stacked lamellae (SL) are\u0000formed where the number of layers increases with the droplet volume, resulting\u0000in a morphological transition sequence from Janus particle to square SL. When\u0000the C homopolymers are strongly selective to the B-blocks, a series of\u0000non-lamellar morphologies, including onion-, hamburger-, cross-, ring-, and\u0000cookie-like structures, are observed. A detailed free energy analysis reveals a\u0000first-order reversible transformation between SL and onion-like (OL) structures\u0000when the selectivity of the homopolymers is changed. Our results provide a\u0000comprehensive understanding of how various factors, such as the copolymer\u0000concentration, homopolymer chain length, degree of confinement, homopolymer\u0000selectivity, affect the self-assembled structures of diblock copolymers under\u0000soft 3D confinement.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220678","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