Predicting nonlinear physical aging of glasses from equilibrium relaxation via the material time

Science Advances, Journal Year: 2022, Volume and Issue: 8(11)

Published: March 16, 2022

The noncrystalline glassy state of matter plays a role in virtually all fields materials science and offers complementary properties to those the crystalline counterpart. caveat is that it out equilibrium therefore exhibits physical aging, i.e., material change over time. For half century, aging glasses has been known be described well by material-time concept, although existence time never directly validated. We do this here successfully predicting molecular glass 4-vinyl-1,3-dioxolan-2-one from its linear relaxation behavior. This establishes defining property Via fluctuation-dissipation theorem, our results imply can predicted thermal-equilibrium fluctuation data, which confirmed computer simulations binary liquid mixture.

Language: Английский

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Time reversibility during the ageing of materials

Nature Physics, Journal Year: 2024, Volume and Issue: 20(4), P. 637 - 645

Published: Jan. 26, 2024

Language: Английский

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Glassy Dynamics in Chiral Fluids

Physical Review Letters, Journal Year: 2023, Volume and Issue: 130(5)

Published: Jan. 31, 2023

Chiral active matter is enjoying a rapid increase of interest, spurred by the rich variety asymmetries that can be attained in, e.g., shape or self-propulsion mechanism particles. Though this has already led to observance so-called chiral crystals, glasses remain largely unexplored. A possible reason for could naive expectation interactions dominate glassy dynamics and details motion become increasingly less relevant. Here, we show quite opposite true studying interacting Brownian We demonstrate when our fluid pushed conditions, it exhibits highly nontrivial dynamics, especially compared standard linear such as common Despite added complexity, are still able present full rationalization all identified dynamical regimes. Most notably, introduce new "hammering" mechanism, unique rapidly spinning particles in high-density fluidize solid.

Language: Английский

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Classifying the age of a glass based on structural properties: A machine learning approach

Physical Review Materials, Journal Year: 2024, Volume and Issue: 8(2)

Published: Feb. 21, 2024

It is well established that physical aging of amorphous solids governed by a marked change in dynamical properties as the material becomes older. Conversely, structural such radial distribution function exhibit only very weak age dependence, usually deemed negligible with respect to numerical noise. Here we demonstrate extremely age-dependent changes structure are, fact, sufficient reliably assess glass support machine learning. We employ supervised learning method predict based on system's instantaneous function. Specifically, train multilayer perceptron for model former quenched different temperatures and find this neural network can accurately classify our system across at least 4 orders magnitude time. Our analysis also reveals which features encode most useful information. Overall, work shows through aid learning, simple structure-dynamics link can, indeed, be physically aged glasses.

Language: Английский

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Mode-coupling theory for mixtures of athermal self-propelled particles

The Journal of Chemical Physics, Journal Year: 2023, Volume and Issue: 159(1)

Published: July 5, 2023

Dense or glassy active matter, as a result of its remarkable resemblance to passive glass-forming materials, is enjoying increasing scientific interest. To better grasp the subtle effect motion on process vitrification, number mode-coupling theories (MCTs) have recently been developed. These proven capable qualitatively predicting important parts phenomenology. However, most efforts so far only considered single-component and their derivations are arguably more complex than standard MCT case, which might hinder broader usage. Here we present detailed derivation distinct for mixtures athermal self-propelled particles that transparent previously introduced versions. The key insight can follow similar strategy our overdamped system typically used underdamped MCT. Interestingly, when considering one particle species, theory gives exact same obtained in previous work, employed highly different strategy. Moreover, assess quality novel extension multi-component materials by using it predict dynamics Kob-Andersen mixture Brownian quasi-hard spheres. We demonstrate able capture all qualitative features, notably location optimum persistence length cage coincide, each combination types.

Language: Английский

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Rotational inertia-induced glassy transition in chiral particle systems

Physical review. E, Journal Year: 2024, Volume and Issue: 109(6)

Published: June 3, 2024

The dense active matter exhibits characteristics reminiscent of traditional glassy phenomena, yet the role rotational inertia in glass dynamics remains elusive. In this study, we investigate chiral particles influenced by inertia. Rotational endows exponential memory to particle orientation, restricting its alteration and amplifying effective persistence time. At lower spinning frequencies, diffusion coefficient a peak function relative for shorter times, while it steadily increases with longer times. realm high-frequency spinning, impact on behavior becomes more pronounced, resulting nonmonotonic intricate relationship between Consequently, introduction significantly alters particles, allowing control over transitions fluid states modulating Moreover, our findings indicate that at specific temperature, there exists an optimal frequency which attains maximum value.

Language: Английский

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Distance-as-time in physical aging

Physical review. E, Journal Year: 2022, Volume and Issue: 106(5)

Published: Nov. 28, 2022

Although it has been known for half a century that the physical aging of glasses in experiments is described well by linear thermal-history convolution integral over so-called material time, microscopic definition and interpretation time remains mystery. We propose material-time increase given interval reflects distance traveled system's particles. Different possible measures are discussed, starting from standard mean-square displacement its inherent-state version excludes vibrational contribution. The viewpoint adopted, which inspired closely related to pioneering works Cugliandolo Kurchan 1990s, implies "geometric reversibility" "unique-triangle property" characterizing path configuration space during aging. Both these properties inherited equilibrium; they confirmed computer simulations an binary Lennard-Jones system. Our show slow particles control time. This motivates "dynamic-rigidity-percolation" picture numerical data dominated slowest particles' inherent displacement, conveniently quantified harmonic displacement. measure collapses potential-energy sense normalized relaxation functions following different temperature jumps almost same function Finally, Tool-Narayanaswamy description derived assumption when replaced above sense, system expression as linear-response theory.

Language: Английский

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Active glassy dynamics is unaffected by the microscopic details of self-propulsion

The Journal of Chemical Physics, Journal Year: 2022, Volume and Issue: 157(22)

Published: Dec. 8, 2022

Recent years have seen a rapid increase of interest in dense active materials, which, the disordered state, share striking similarities with conventional passive glass-forming matter. For such glassy it is well established (at least three dimensions) that details microscopic dynamics, e.g., Newtonian or Brownian, do not influence long-time behavior. Here, we investigate whether this still holds true non-equilibrium case by considering two simple and widely used particle models, i.e., Ornstein-Uhlenbeck particles (AOUPs) Brownian (ABPs). In particular, seek to gain more insight into role self-propulsion mechanism on dynamics deriving mode-coupling theory (MCT) for thermal AOUPs, which can be directly compared recently developed MCT ABPs. Both theories explicitly take account degrees freedom. We solve AOUP- ABP-MCT equations dimensions demonstrate both models give almost identical results intermediate scattering function over large variety control parameters (packing fractions, speeds, persistence times). also confirm theoretical equivalence between different mechanisms numerically via simulations polydisperse mixture quasi-hard spheres, thereby establishing that, at these model systems, alter

Language: Английский

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Active jamming at criticality

Physical Review Research, Journal Year: 2024, Volume and Issue: 6(2)

Published: April 22, 2024

Jamming is ubiquitous in disordered systems, but the critical behavior of jammed solids subjected to active forces or thermal fluctuations remains elusive. In particular, while passive athermal jamming mean-field-like two and three dimensions, diverse matter systems exhibit anomalous scaling all physical dimensions. It therefore natural ask whether activity leads systems. Here, we use numerical analytical methods study active, soft, frictionless spheres elucidate universal that relates excess coordination, temperature, pressure close point. We show effects around state can again be captured by a mean-field picture, thus highlighting distinct crucial role amorphous structure Published American Physical Society 2024

Language: Английский

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Emergent mesoscale correlations in active solids with noisy chiral dynamics

Soft Matter, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We present the linear response theory for an elastic solid composed of active Brownian particles with intrinsic individual chirality, deriving both a normal mode formulation and continuum formulation.

Language: Английский

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