Activation induced fluidization of a confined viscous liquid

Mercier, Felix; Delhaye, Gaetan; Teboul, Victor

doi:10.1016/j.molliq.2022.119545

Cited by 4 publications

(2 citation statements)

References 92 publications

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“…An induced fluidization was also reported [18,19,[56][57][58][59][60][61][62][63][64] experimentally and with simulation when simple molecular motors [65][66][67][68][69][70][71][72][73][74] activate a soft material. The relation between these two fluidization mechanisms is however not established.…”

Section: Introductionmentioning

confidence: 69%

“…Our purpose in this study is to test an out of equilibrium model mimicking the behavior of supercooled liquids. We use out of equilibrium molecular dynamic simulations [75][76][77][78] in order to find results easier to understand in a practical way and easier to compare to previous studies on molecular motors [62,64,[79][80][81][82], in particular to fluidization phenomena observed experimentally and theoretically [56][57][58][59][60][61][62][63] when molecular motors are diluted inside soft materials. The system is maintained out of equilibrium by the presence of active molecules releasing energy into it and damped molecules absorbing energy.…”

Section: Calculationmentioning

confidence: 99%

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Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid

Teboul¹

2023

Preprint

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The purpose of this work is to use active particles to study the effect of facilitation on supercooled liquids. To this end we investigate the behavior of a model supercooled liquid doped with intermittently active and intermittently slowed particles. To simulate a facilitation mechanism, the active particles are submitted intermittently to a force following the mobility of the most mobile molecule around, while the slowed particles are submitted to a friction force. We observe upon activation, a fluidization of the whole medium simultaneously to a large increase of the dynamic heterogeneity. This effect is reminiscent of the fluidization observed with molecular motors doping of the medium. When the mobility characteristic time τµ used in the facilitation mechanism matches the physical time t * characterizing the spontaneous mobility aggregation of the material, we observe a phase transition associated with a structural aggregation of active molecules. This transition is accompanied by a sharp increase of the fluidization and dynamic heterogeneity.

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Section: Introductionmentioning

confidence: 69%

Section: Calculationmentioning

confidence: 99%

Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid

Teboul¹

2023

Preprint

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Transmission of mobility via cooperative mechanisms in soft active matter

Teboul

2024

Physics of Fluids

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When supercooled, liquid's viscosity increases dramatically as the glass transition temperature is approached. Although the physical origin of this behavior is still not understood, it is now well established that the addition of a few activated particles is able to reverse that increase in viscosity. Here we further raise the question of a limit in that fluidization process and of the differences between the fluidized liquid and its viscous counterpart. The results show that a few percent active molecules are enough to trigger a phase transition leading to diffusion coefficients typical of liquids while the medium retains cooperative properties of the viscous phase. The similarity between cooperative properties of the active and non-active molecules suggests that the mobility of active molecules is transmitted to inactive ones via the medium's cooperative mechanisms, a result in agreement with facilitation theories. This result is then confirmed by the compared behavior of the distinct Van Hove correlation functions of most mobile active and non-active molecules. Interestingly enough, in our simulations, the cooperative mechanisms are not induced or related to a decrease in the excitation concentration.

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Dynamic phase transition induced by active molecules in a supercooled liquid

Teboul

2023

Phys. Rev. E

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Activation induced fluidization of a confined viscous liquid

Cited by 4 publications

References 92 publications

Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid

Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid

Transmission of mobility via cooperative mechanisms in soft active matter

Dynamic phase transition induced by active molecules in a supercooled liquid

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