Coupling between criticality and gelation in “sticky” spheres: a structural analysis†,Soft Matter

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Coupling between criticality and gelation in “sticky” spheres: a structural analysis†
Soft Matter ( IF 2.9 ) Pub Date : 2018-05-11 00:00:00 , DOI: 10.1039/c8sm00389k
David Richard _{1,

2,

3,

4} , James Hallett _{5,

6,

7,

8} , Thomas Speck _{1,

2,

3,

4} , C. Patrick Royall _{5,

6,

7,

8,

9}

Affiliation

We combine experiments and simulations to study the link between criticality and gelation in sticky spheres. We employ confocal microscopy to image colloid–polymer mixtures and Monte Carlo simulations of the square-well (SW) potential as a reference model. To this end, we map our experimental samples onto the SW model. We find an excellent structural agreement between experiments and simulations, both for locally favored structures at the single particle level and large-scale fluctuations at criticality. We follow in detail the rapid structural change in the critical fluid when approaching the gas–liquid binodal and highlight the role of critical density fluctuations for this structural crossover. Our results link the arrested spinodal decomposition to long-lived energetically favored structures, which grow even away from the binodal due to the critical scaling of the bulk correlation length and static susceptibility.

中文翻译：

“粘性”球体的临界度和凝胶化之间的耦合：结构分析†

我们结合实验和模拟来研究粘性球体的临界度和凝胶化之间的联系。我们采用共聚焦显微镜对胶体-聚合物混合物进行成像，并以方孔（SW）势的蒙特卡洛模拟作为参考模型。为此，我们将实验样本映射到SW模型上。我们在实验和模拟之间找到了极好的结构一致性，无论是对于单个粒子级别上的本地首选结构还是在临界点上的大规模波动。当接近气液双斜面时，我们将详细介绍临界流体的快速结构变化，并着重指出临界密度波动在这种结构交叉中的作用。我们的结果将受阻的旋节线分解与寿命长的受能量支持的结构相关联，

更新日期：2018-05-11

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