arXiv - PHYS - Soft Condensed Matter最新文献_第7页

Gellan-Based Hydrogels and Microgels for culturage heritage: a rheological perspective 用于培养遗产的结冷胶水凝胶和微凝胶：流变学视角

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-30 DOI: arxiv-2408.17247

Silvia Franco, Leonardo Severini, Elena Buratti, Letizia Tavagnacco, Simona Sennato, Mauro Missori, Barbara Ruzicka, Claudia Mazzuca, Emanuela Zaccarelli, Roberta Angelini

{"title":"Gellan-Based Hydrogels and Microgels for culturage heritage: a rheological perspective","authors":"Silvia Franco, Leonardo Severini, Elena Buratti, Letizia Tavagnacco, Simona Sennato, Mauro Missori, Barbara Ruzicka, Claudia Mazzuca, Emanuela Zaccarelli, Roberta Angelini","doi":"arxiv-2408.17247","DOIUrl":"https://doi.org/arxiv-2408.17247","url":null,"abstract":"Gellan gum has gained significant attention due to its versatility in\u0000multiple applications in the form of hydrogels and microgels. A thorough\u0000understanding of the rheological behaviour of these systems is crucial both for\u0000fundamental research and to optimize the manufacturing needs. To this aim, here\u0000we extensively characterize the rheological behaviour of gellan based hydrogels\u0000and microgels recently used for efficient paper cleaning for restoration\u0000interventions. In particular, we study their viscoelastic properties, also\u0000during hydrogel and microgel formation, assessing the role of temperature,\u0000gellan concentration, and, importantly, the presence of different cations,\u0000which plays a crucial role in the gelation process. We find the interesting\u0000result that, in the conditions where they are efficient for cleaning, gellan\u0000hydrogels exhibit a double yielding behavior. In addition, we provide a\u0000detailed description of gellan microgels preparation, ensuring high control and\u0000reproducibility of the samples. Altogether our study sheds light on the\u0000mechanical stability, network structure, and overall functionality of the\u0000gellan-based gels, providing valuable insights into optimizing conditions for\u0000desired applications in paper cleaning.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220672","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

Droplets sliding on soft solids shed elastocapillary rails 在软固体上滑动的液滴会脱落弹性毛细管轨道

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-30 DOI: arxiv-2409.00280

Nan Xue, Lawrence A. Wilen, Robert W. Style, Eric R. Dufresne

引用次数: 0

Dimensional confinement and superdiffusive rotational motion of uniaxial colloids in the presence of cylindrical obstacles 存在圆柱形障碍物时单轴胶体的尺寸限制和超扩散旋转运动

arXiv - PHYS - Soft Condensed Matter Pub Date : 2024-08-30 DOI: arxiv-2408.17345

Vikki Anand Varma, Sujin B Babu

{"title":"Dimensional confinement and superdiffusive rotational motion of uniaxial colloids in the presence of cylindrical obstacles","authors":"Vikki Anand Varma, Sujin B Babu","doi":"arxiv-2408.17345","DOIUrl":"https://doi.org/arxiv-2408.17345","url":null,"abstract":"In biological system like cell the macromolecules which are anisotropic\u0000particles diffuse in a crowded medium. In the present work we have studied the\u0000diffusion of spheroidal particles diffusing between cylindrical obstacles by\u0000varying the density of the obstacles as well as the spheroidal particles.\u0000Analytical calculation of the free energy showed that the orientational vector\u0000of a single oblate particle will be aligned perpendicular and a prolate\u0000particle will be aligned parallel to the symmetry axis of the cylindrical\u0000obstacles in equilibrium. The nematic transition of the system with and without\u0000obstacle remained the same, but in the case of obstacles the nematic vector of\u0000the spheroid system always remained parallel to the cylindrical axis. The\u0000component of the translational diffusion coefficient of the spheroidal particle\u0000perpendicular to the axis of the cylinder is calculated for isotropic system\u0000which agrees with analytical calculation. When the cylinders overlap such that\u0000the spheroidal particles can only diffuse along the direction parallel to the\u0000axis of the cylinder we could observe dimensional confinement. This was\u0000observed by the discontinuous fall of the diffusion coefficient, when plotted\u0000against the chemical potential both for single particle as well as for finite\u0000volume fraction. The rotational diffusion coefficient quickly reached the bulk\u0000value as the distance between the obstacle increased in the isotropic phase. In\u0000the nematic phase the rotational motion of the spheroid should be arrested. We\u0000observed that even though the entire system remained in the nematic phase the\u0000oblate particle close to the cylinder underwent flipping motion. The\u0000consequence is that when the rotational mean squared displacement was\u0000calculated it showed a super-diffusive behavior even though the orientational\u0000self correlation function never relaxed to zero.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220670","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

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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