脆弱性
材料科学
弹性(物理)
胶体
聚苯乙烯
化学物理
相图
放松(心理学)
玻璃化转变
纳米颗粒
粒子(生态学)
胶粒
弹性能
纳米技术
热的
热涨落
颗粒密度
相变
粒子动力学
热力学
软质材料
粒径
软物质
弹性模量
相(物质)
动力非均质性
动态力学分析
复合材料
粒子系统
作者
Yihui Zhu,Yan Gao,Juanjuan Gao,R. Zhang,G Liu
出处
期刊:ACS Macro Letters
[American Chemical Society]
日期:2026-01-05
卷期号:15 (1): 137-142
标识
DOI:10.1021/acsmacrolett.5c00700
摘要
Soft colloids play a vital role in modern life and provide insights into the physics of vitrification. Soft colloidal glasses exhibit significant variations in dynamic fragility─the sensitivity of relaxation dynamics to concentrations. While particle softness, including cross-linking density and charge, influences fragility, their complex interplay obscures the fundamental physics. This study conducts a systematic investigation of 16 uncharged polystyrene soft nanoparticles (SNPs) with independently controlled diameter and elasticity. The research quantifies relaxation time as a function of particle concentration, diameter, and cross-linking density using two fitting parameters. Through this analysis, fragility is determined and correlated to the elastic energy per particle (particle elasticity multiplied by volume). Particles below a threshold elastic energy (smaller or softer) would deform readily under thermal energy, exhibiting strong glass behavior. In contrast, larger or stiffer particles undergo fragile glass transitions through a cooperative relaxation. This investigation establishes a dynamic phase diagram that predicts fragility transitions, addresses existing contradictions, and presents design principles for colloidal suspensions.
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