The sequential response of driven frustrated media encodes memory effects and hidden computational capabilities. While abstract hysteron models can capture these effects, they require phenomenologically introduced interactions, limiting their predictive power. Here we introduce networks of bistable elements - physical hysterons - whose interactions are controlled by the networks' geometry. These networks realize a wide range of previously unobserved exotic pathways, including those that surpass current hysteron models. Our work paves the way for advanced microscopic models of memory and the rational design of (meta)materials with targeted pathways and capabilities.
{"title":"Geometric control and memory in networks of bistable elements","authors":"Dor Shohat, Martin van Hecke","doi":"arxiv-2409.07804","DOIUrl":"https://doi.org/arxiv-2409.07804","url":null,"abstract":"The sequential response of driven frustrated media encodes memory effects and\u0000hidden computational capabilities. While abstract hysteron models can capture\u0000these effects, they require phenomenologically introduced interactions,\u0000limiting their predictive power. Here we introduce networks of bistable\u0000elements - physical hysterons - whose interactions are controlled by the\u0000networks' geometry. These networks realize a wide range of previously\u0000unobserved exotic pathways, including those that surpass current hysteron\u0000models. Our work paves the way for advanced microscopic models of memory and\u0000the rational design of (meta)materials with targeted pathways and capabilities.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220785","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}
Hysterons are the basic units of hysteresis that underlie many of the complex behaviors of disordered matter. Recent work has sought to develop designs for mechanical hysterons, both to better understand their interactions and to create materials that respond to their mechanical environment in novel ways. Elastic structures including slender beams, creased sheets, and shells offer the requisite bistability for artificial hysterons, but producing and controlling interactions between such structures has proven challenging. Here we report a mechanical hysteron composed of rigid bars and linear springs, which has controllable properties and tunable interactions of general sign. We derive an approximate mapping from the system parameters to the hysteron properties, and we show how collective behaviors of multiple hysterons can be targeted by adjusting geometric parameters on the fly. Our results provide a basic step towards hysteron-based materials that can sense, compute, and respond to their mechanical environment.
{"title":"Mechanical hysterons with tunable interactions of general sign","authors":"Joseph D. Paulsen","doi":"arxiv-2409.07726","DOIUrl":"https://doi.org/arxiv-2409.07726","url":null,"abstract":"Hysterons are the basic units of hysteresis that underlie many of the complex\u0000behaviors of disordered matter. Recent work has sought to develop designs for\u0000mechanical hysterons, both to better understand their interactions and to\u0000create materials that respond to their mechanical environment in novel ways.\u0000Elastic structures including slender beams, creased sheets, and shells offer\u0000the requisite bistability for artificial hysterons, but producing and\u0000controlling interactions between such structures has proven challenging. Here\u0000we report a mechanical hysteron composed of rigid bars and linear springs,\u0000which has controllable properties and tunable interactions of general sign. We\u0000derive an approximate mapping from the system parameters to the hysteron\u0000properties, and we show how collective behaviors of multiple hysterons can be\u0000targeted by adjusting geometric parameters on the fly. Our results provide a\u0000basic step towards hysteron-based materials that can sense, compute, and\u0000respond to their mechanical environment.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227391","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}
Jonathan G. Raybin, Ethan J. Dunsworth, Veronica Guo, Naomi S. Ginsberg
The directed self-assembly of colloidal nanoparticles (NPs) using external fields guides the formation of sophisticated hierarchical materials but becomes less effective with decreasing particle size. As an alternative, electron-beam-driven assembly offers a potential avenue for targeted nanoscale manipulation, yet remains poorly controlled due to the variety and complexity of beam interaction mechanisms. Here, we investigate the beam-particle interaction of silica NPs pinned to the fluid-vacuum interface of ionic liquid droplets. In these experiments, scanning electron microscopy of the droplet surface resolves NP trajectories over space and time while simultaneously driving their reorganization. With this platform, we demonstrate the ability to direct particle transport and create transient, reversible colloidal patterns on the droplet surface. By tuning the beam voltage, we achieve precise control over both the strength and sign of the beam-particle interaction, with low voltages repelling particles and high voltages attracting them. This response stems from the formation of well-defined solvent flow fields generated from trace radiolysis of the ionic liquid, as determined through statistical analysis of single-particle trajectories under varying solvent composition. Altogether, electron-beam-guided assembly introduces a versatile strategy for nanoscale colloidal manipulation, offering new possibilities for the design of dynamic, reconfigurable systems with applications in adaptive photonics and catalysis.
{"title":"Reversible Electron-Beam Patterning of Colloidal Nanoparticles at Fluid Interfaces","authors":"Jonathan G. Raybin, Ethan J. Dunsworth, Veronica Guo, Naomi S. Ginsberg","doi":"arxiv-2409.08192","DOIUrl":"https://doi.org/arxiv-2409.08192","url":null,"abstract":"The directed self-assembly of colloidal nanoparticles (NPs) using external\u0000fields guides the formation of sophisticated hierarchical materials but becomes\u0000less effective with decreasing particle size. As an alternative,\u0000electron-beam-driven assembly offers a potential avenue for targeted nanoscale\u0000manipulation, yet remains poorly controlled due to the variety and complexity\u0000of beam interaction mechanisms. Here, we investigate the beam-particle\u0000interaction of silica NPs pinned to the fluid-vacuum interface of ionic liquid\u0000droplets. In these experiments, scanning electron microscopy of the droplet\u0000surface resolves NP trajectories over space and time while simultaneously\u0000driving their reorganization. With this platform, we demonstrate the ability to\u0000direct particle transport and create transient, reversible colloidal patterns\u0000on the droplet surface. By tuning the beam voltage, we achieve precise control\u0000over both the strength and sign of the beam-particle interaction, with low\u0000voltages repelling particles and high voltages attracting them. This response\u0000stems from the formation of well-defined solvent flow fields generated from\u0000trace radiolysis of the ionic liquid, as determined through statistical\u0000analysis of single-particle trajectories under varying solvent composition.\u0000Altogether, electron-beam-guided assembly introduces a versatile strategy for\u0000nanoscale colloidal manipulation, offering new possibilities for the design of\u0000dynamic, reconfigurable systems with applications in adaptive photonics and\u0000catalysis.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220783","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}
The mechanical behavior of disordered materials such as dense suspensions, glasses or granular materials depends on their thermal and mechanical past. Here we report the memory behavior of a quenched mesoscopic elasto-plastic (QMEP) model. After prior oscillatory training, a simple read-out protocol gives access to both the training protocol's amplitude and the last shear direction. The memory of direction emerges from the development of a mechanical polarization during training. The analysis of sample-to-sample fluctuations gives direct access to the irreversibility transition. Despite the quadrupolar nature of the elastic interactions in amorphous solids, a behavior close to Return Point Memory (RPM) is observed. The quasi RPM property is used to build a simple Preisach-like model of directional memory.
{"title":"Self-organization and memory in a cyclically driven elasto-plastic model of an amorphous solid","authors":"Dheeraj Kumar, Muhittin Mungan, Sylvain Patinet, Damien Vandembroucq","doi":"arxiv-2409.07621","DOIUrl":"https://doi.org/arxiv-2409.07621","url":null,"abstract":"The mechanical behavior of disordered materials such as dense suspensions,\u0000glasses or granular materials depends on their thermal and mechanical past.\u0000Here we report the memory behavior of a quenched mesoscopic elasto-plastic\u0000(QMEP) model. After prior oscillatory training, a simple read-out protocol\u0000gives access to both the training protocol's amplitude and the last shear\u0000direction. The memory of direction emerges from the development of a mechanical\u0000polarization during training. The analysis of sample-to-sample fluctuations\u0000gives direct access to the irreversibility transition. Despite the quadrupolar\u0000nature of the elastic interactions in amorphous solids, a behavior close to\u0000Return Point Memory (RPM) is observed. The quasi RPM property is used to build\u0000a simple Preisach-like model of directional memory.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220591","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}
Fr'eedericksz transitions in nematic liquid crystals are re-examined with a focus on differences between systems with magnetic fields and those with electric fields. A magnetic field can be treated as uniform in a liquid-crystal medium; while a nonuniform director field will in general cause nonuniformity of the local electric field as well. Despite these differences, the widely held view is that the formula for the threshold of local instability in an electric-field Fr'eedericksz transition can be obtained from that for the magnetic-field transition in the same geometry by simply replacing the magnetic parameters by their electric counterparts. However, it was shown in [Arakelyan, Karayan, and Chilingaryan, Sov. Phys. Dokl., 29 (1984) 202-204] that in two of the six classical electric-field Fr'eedericksz transitions, the local-instability threshold should be strictly greater than that predicted by this magnetic-field analogy. Why this elevation of the threshold occurs is carefully examined, and a simple test to determine when it can happen is given. This "anomalous behavior" is not restricted to classical Fr'eedericksz transitions and is shown to be present in certain layered systems (planar cholesterics, smectic-A) and in certain nematic systems that exhibit periodic instabilities.
{"title":"Anomalous behavior of electric-field Fréedericksz transitions","authors":"Eugene C. Gartland Jr","doi":"arxiv-2409.07654","DOIUrl":"https://doi.org/arxiv-2409.07654","url":null,"abstract":"Fr'eedericksz transitions in nematic liquid crystals are re-examined with a\u0000focus on differences between systems with magnetic fields and those with\u0000electric fields. A magnetic field can be treated as uniform in a liquid-crystal\u0000medium; while a nonuniform director field will in general cause nonuniformity\u0000of the local electric field as well. Despite these differences, the widely held\u0000view is that the formula for the threshold of local instability in an\u0000electric-field Fr'eedericksz transition can be obtained from that for the\u0000magnetic-field transition in the same geometry by simply replacing the magnetic\u0000parameters by their electric counterparts. However, it was shown in [Arakelyan,\u0000Karayan, and Chilingaryan, Sov. Phys. Dokl., 29 (1984) 202-204] that in two of\u0000the six classical electric-field Fr'eedericksz transitions, the\u0000local-instability threshold should be strictly greater than that predicted by\u0000this magnetic-field analogy. Why this elevation of the threshold occurs is\u0000carefully examined, and a simple test to determine when it can happen is given.\u0000This \"anomalous behavior\" is not restricted to classical Fr'eedericksz\u0000transitions and is shown to be present in certain layered systems (planar\u0000cholesterics, smectic-A) and in certain nematic systems that exhibit periodic\u0000instabilities.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220589","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}
Pattern formation inside a liquid phase is a phenomenon involved in many different aspects of life on our planet. The droplet form of a liquid that evaporates can reveal patterns that depend on the chemistry of the droplet and the physical parameters involved. We observed a flower-like deposition pattern of micrometer-sized particles as a result of the evaporation of a droplet containing salt and a non-ionic polymer. We show experimentally that the phase separation of the polymer due to the salting-out effect causes a strong entropic flow, which manifests as vortices. The flow is called phase separation bursting flow, which leads to the axial symmetry breaking and the formation of a radially aligned flower-like pattern. We foresee that understanding the observed flow can provide insights into the fluid physics aspects of phase separation and may have implications for technical applications.
{"title":"Phase separation bursting and symmetry breaking inside an evaporating droplet; formation of a flower-like pattern","authors":"Vahid Nasirimarekani","doi":"arxiv-2409.07095","DOIUrl":"https://doi.org/arxiv-2409.07095","url":null,"abstract":"Pattern formation inside a liquid phase is a phenomenon involved in many\u0000different aspects of life on our planet. The droplet form of a liquid that\u0000evaporates can reveal patterns that depend on the chemistry of the droplet and\u0000the physical parameters involved. We observed a flower-like deposition pattern\u0000of micrometer-sized particles as a result of the evaporation of a droplet\u0000containing salt and a non-ionic polymer. We show experimentally that the phase\u0000separation of the polymer due to the salting-out effect causes a strong\u0000entropic flow, which manifests as vortices. The flow is called phase separation\u0000bursting flow, which leads to the axial symmetry breaking and the formation of\u0000a radially aligned flower-like pattern. We foresee that understanding the\u0000observed flow can provide insights into the fluid physics aspects of phase\u0000separation and may have implications for technical applications.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220621","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}
Rotors are common in nature - from rotating membrane-proteins to superfluid-vortices. Yet, little is known about the collective dynamics of heterogeneous populations of rotors. Here, we show experimentally, numerically, and analytically that at small but finite inertia, a mixed population of oppositely spinning rotors spontaneously self-assembles into active chains, which we term gyromers. The gyromers are formed and stabilized by fluid motion and steric interactions alone. A detailed analysis of pair interaction shows that rotors with the same spin repel and orbit each other while opposite rotors spin-pair and propagate together as bound dimers. Rotor dimers interact with individual rotors, each other, and the boundaries to form chains. A minimal model predicts the formation of gyromers in numerical simulations and their possible subsequent folding into secondary structures of lattices and rings. This inherently out-of-equilibrium polymerization process holds promise for engineering self-assembled metamaterials such as artificial proteins.
{"title":"Hydrodynamic Spin-Pairing and Active Polymerization of Oppositely Spinning Rotors","authors":"Mattan Gelvan, Artyom Chirko, Jonathan Kirpitch, Yahav Lavie, Noa Israel, Naomi Oppenheimer","doi":"arxiv-2409.07554","DOIUrl":"https://doi.org/arxiv-2409.07554","url":null,"abstract":"Rotors are common in nature - from rotating membrane-proteins to\u0000superfluid-vortices. Yet, little is known about the collective dynamics of\u0000heterogeneous populations of rotors. Here, we show experimentally, numerically,\u0000and analytically that at small but finite inertia, a mixed population of\u0000oppositely spinning rotors spontaneously self-assembles into active chains,\u0000which we term gyromers. The gyromers are formed and stabilized by fluid motion\u0000and steric interactions alone. A detailed analysis of pair interaction shows\u0000that rotors with the same spin repel and orbit each other while opposite rotors\u0000spin-pair and propagate together as bound dimers. Rotor dimers interact with\u0000individual rotors, each other, and the boundaries to form chains. A minimal\u0000model predicts the formation of gyromers in numerical simulations and their\u0000possible subsequent folding into secondary structures of lattices and rings.\u0000This inherently out-of-equilibrium polymerization process holds promise for\u0000engineering self-assembled metamaterials such as artificial proteins.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220590","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}
Jack Eatson, Susann Bauernfeind, Benjamin Midtvedt, Antonio Ciarlo, Johannes Menath, Giuseppe Pesce, Andrew B. Schofield, Giovanni Volpe, Paul S. Clegg, Nicolas Vogel, D. Martin. A. Buzza, Marcel Rey
Ellipsoidal particles confined at liquid interfaces exhibit complex self-assembly behaviour due to quadrupolar capillary interactions induced by meniscus deformation. These interactions cause particles to attract each other in either tip-to-tip or side-to-side configurations. However, controlling their interfacial self-assembly is challenging because it is difficult to predict which of these two states will be preferred. In this study, we demonstrate that introducing a soft shell around hard ellipsoidal particles provides a means to control the self-assembly process, allowing us to switch the preferred configuration between these states. We study their interfacial self-assembly and find that pure ellipsoids without a shell consistently form a "chain-like" side-to-side assembly, regardless of aspect ratio. In contrast, core-shell ellipsoids transition from "flower-like" tip-to-tip to "chain-like" side-to-side arrangements as their aspect ratios increase. The critical aspect ratio for transitioning between these structures increases with shell-to-core ratios. Our experimental findings are corroborated by theoretical calculations and Monte Carlo simulations, which map out the phase diagram of thermodynamically preferred self-assembly structures for core-shell ellipsoids as a function of aspect ratio and shell-to-core ratios. This study shows how to program the self-assembly of anisotropic particles by tuning their physicochemical properties, allowing the deterministic realization of distinct structural configurations.
{"title":"Programmable self-assembly of core-shell ellipsoids at liquid interfaces","authors":"Jack Eatson, Susann Bauernfeind, Benjamin Midtvedt, Antonio Ciarlo, Johannes Menath, Giuseppe Pesce, Andrew B. Schofield, Giovanni Volpe, Paul S. Clegg, Nicolas Vogel, D. Martin. A. Buzza, Marcel Rey","doi":"arxiv-2409.07443","DOIUrl":"https://doi.org/arxiv-2409.07443","url":null,"abstract":"Ellipsoidal particles confined at liquid interfaces exhibit complex\u0000self-assembly behaviour due to quadrupolar capillary interactions induced by\u0000meniscus deformation. These interactions cause particles to attract each other\u0000in either tip-to-tip or side-to-side configurations. However, controlling their\u0000interfacial self-assembly is challenging because it is difficult to predict\u0000which of these two states will be preferred. In this study, we demonstrate that\u0000introducing a soft shell around hard ellipsoidal particles provides a means to\u0000control the self-assembly process, allowing us to switch the preferred\u0000configuration between these states. We study their interfacial self-assembly\u0000and find that pure ellipsoids without a shell consistently form a \"chain-like\"\u0000side-to-side assembly, regardless of aspect ratio. In contrast, core-shell\u0000ellipsoids transition from \"flower-like\" tip-to-tip to \"chain-like\"\u0000side-to-side arrangements as their aspect ratios increase. The critical aspect\u0000ratio for transitioning between these structures increases with shell-to-core\u0000ratios. Our experimental findings are corroborated by theoretical calculations\u0000and Monte Carlo simulations, which map out the phase diagram of\u0000thermodynamically preferred self-assembly structures for core-shell ellipsoids\u0000as a function of aspect ratio and shell-to-core ratios. This study shows how to\u0000program the self-assembly of anisotropic particles by tuning their\u0000physicochemical properties, allowing the deterministic realization of distinct\u0000structural configurations.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227352","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}
Eric Cereceda-López, Marco De Corato, Ignacio Pagonabarraga, Fanlong Meng, Pietro Tierno, Antonio Ortiz-Ambriz
The effect of curvature and how it induces and enhances the transport of colloidal particles driven through narrow channels represent an unexplored research avenue. Here we combine experiments and simulations to investigate the dynamics of magnetically driven colloidal particles confined through a narrow, circular channel. We use an external precessing magnetic field to induce a net torque and spin the particles at a defined angular velocity. Due to the spinning, the particle propulsion emerges from the different hydrodynamic coupling with the inner and outer walls and strongly depends on the curvature. The experimental findings are combined with finite element numerical simulations that predict a positive rotation translation coupling in the mobility matrix. Further, we explore the collective transport of many particles across the curved geometry, making an experimental realization of a driven single file system. With our finding, we elucidate the effect of curvature on the transport of microscopic particles which could be important to understand the complex, yet rich, dynamics of particle systems driven through curved microfluidic channels.
{"title":"Curvature induces and enhances transport of spinning colloids through narrow channels","authors":"Eric Cereceda-López, Marco De Corato, Ignacio Pagonabarraga, Fanlong Meng, Pietro Tierno, Antonio Ortiz-Ambriz","doi":"arxiv-2409.07661","DOIUrl":"https://doi.org/arxiv-2409.07661","url":null,"abstract":"The effect of curvature and how it induces and enhances the transport of\u0000colloidal particles driven through narrow channels represent an unexplored\u0000research avenue. Here we combine experiments and simulations to investigate the\u0000dynamics of magnetically driven colloidal particles confined through a narrow,\u0000circular channel. We use an external precessing magnetic field to induce a net\u0000torque and spin the particles at a defined angular velocity. Due to the\u0000spinning, the particle propulsion emerges from the different hydrodynamic\u0000coupling with the inner and outer walls and strongly depends on the curvature.\u0000The experimental findings are combined with finite element numerical\u0000simulations that predict a positive rotation translation coupling in the\u0000mobility matrix. Further, we explore the collective transport of many particles\u0000across the curved geometry, making an experimental realization of a driven\u0000single file system. With our finding, we elucidate the effect of curvature on\u0000the transport of microscopic particles which could be important to understand\u0000the complex, yet rich, dynamics of particle systems driven through curved\u0000microfluidic channels.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227351","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}
Tristan Jocteur, Eric Bertin, Romain Mari, Kirsten Martens
Close to the yielding transition, amorphous solids exhibit a jerky dynamics characterized by plastic avalanches. The statistics of these avalanches have been measured experimentally and numerically using a variety of different triggering protocols, assuming that all of them were equivalent for this purpose. In particular two main classes of protocols have been studied, deformation under controlled strain or under controlled stress. In this work, we investigate different protocols to generate plasticity avalanches and conduct twodimensional simulations of an elastoplastic model to examine the protocol dependence of avalanche statistics in yield-stress fluids. We demonstrate that when stress is controlled, the value and even the existence of the exponent governing the probability distribution function of avalanche sizes strongly depend on the protocol chosen to initiate avalanches. This confirms in finite dimensions a scenario presented in a previous mean-field analysis. We identify a consistent stress-controlled protocol whose associated avalanches differ from the quasi-static ones in their fractal dimension and dynamical exponent. Remarkably, this protocol also seems to verify the scaling relations among exponents previously proposed. Our results underscores the necessity for a cautious interpretation of avalanche universality within elastoplastic models, and more generally within systems where several control parameters exist.
{"title":"Protocol dependence for avalanches under constant stress in elastoplastic models","authors":"Tristan Jocteur, Eric Bertin, Romain Mari, Kirsten Martens","doi":"arxiv-2409.05444","DOIUrl":"https://doi.org/arxiv-2409.05444","url":null,"abstract":"Close to the yielding transition, amorphous solids exhibit a jerky dynamics\u0000characterized by plastic avalanches. The statistics of these avalanches have\u0000been measured experimentally and numerically using a variety of different\u0000triggering protocols, assuming that all of them were equivalent for this\u0000purpose. In particular two main classes of protocols have been studied,\u0000deformation under controlled strain or under controlled stress. In this work,\u0000we investigate different protocols to generate plasticity avalanches and\u0000conduct twodimensional simulations of an elastoplastic model to examine the\u0000protocol dependence of avalanche statistics in yield-stress fluids. We\u0000demonstrate that when stress is controlled, the value and even the existence of\u0000the exponent governing the probability distribution function of avalanche sizes\u0000strongly depend on the protocol chosen to initiate avalanches. This confirms in\u0000finite dimensions a scenario presented in a previous mean-field analysis. We\u0000identify a consistent stress-controlled protocol whose associated avalanches\u0000differ from the quasi-static ones in their fractal dimension and dynamical\u0000exponent. Remarkably, this protocol also seems to verify the scaling relations\u0000among exponents previously proposed. Our results underscores the necessity for\u0000a cautious interpretation of avalanche universality within elastoplastic\u0000models, and more generally within systems where several control parameters\u0000exist.","PeriodicalId":501146,"journal":{"name":"arXiv - PHYS - Soft Condensed Matter","volume":"296 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142220625","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}
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