Elastically driven intermittent microscopic dynamics in soft solids

被引:91
作者
Bouzid, Mehdi [1 ]
Colombo, Jader [1 ]
Barbosa, Lucas Vieira [1 ,2 ]
Del Gado, Emanuela [1 ]
机构
[1] Georgetown Univ, Inst Soft Matter Synth & Metrol, Dept Phys, 37th & O St NW, Washington, DC 20057 USA
[2] CAPES Fdn, Minist Educ, BR-70040020 Brasilia, DF, Brazil
基金
美国国家科学基金会; 瑞士国家科学基金会;
关键词
FRACTAL COLLOIDAL GELS; STRESS-RELAXATION; SLOW DYNAMICS; DIAGRAM;
D O I
10.1038/ncomms15846
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Soft solids with tunable mechanical response are at the core of new material technologies, but a crucial limit for applications is their progressive aging over time, which dramatically affects their functionalities. The generally accepted paradigm is that such aging is gradual and its origin is in slower than exponential microscopic dynamics, akin to the ones in supercooled liquids or glasses. Nevertheless, time-and space-resolved measurements have provided contrasting evidence: dynamics faster than exponential, intermittency and abrupt structural changes. Here we use 3D computer simulations of a microscopic model to reveal that the timescales governing stress relaxation, respectively, through thermal fluctuations and elastic recovery are key for the aging dynamics. When thermal fluctuations are too weak, stress heterogeneities frozen-in upon solidification can still partially relax through elastically driven fluctuations. Such fluctuations are intermittent, because of strong correlations that persist over the timescale of experiments or simulations, leading to faster than exponential dynamics.
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页数:8
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