Dynamics of a network fluid within the liquid–gas coexistence region,Soft Matter

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Dynamics of a network fluid within the liquid–gas coexistence region
Soft Matter ( IF 2.9 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1039/c7sm01996c
C. S. Dias _{1,

2,

3,

4,

5} , J. M. Tavares _{3,

4,

5,

6,

7} , N. A. M. Araújo _{1,

2,

3,

4,

5} , M. M. Telo da Gama _{1,

2,

3,

4,

5}

Affiliation

Low-density networks of molecules or colloids are formed at low temperatures when the interparticle interactions are valence limited. Prototypical examples are networks of patchy particles, where the limited valence results from highly directional pairwise interactions. We combine extensive Langevin simulations and Wertheim's theory of association to study these networks. We find a scale-free (relaxation) dynamics within the liquid–gas coexistence region, which differs from that usually observed for isotropic particles. While for isotropic particles the relaxation dynamics is driven by surface tension (coarsening), when the valence is limited, the slow relaxation proceeds through the formation of an intermediate non-equilibrium gel via a geometrical percolation transition in the Random Percolation universality class. We show that the slow dynamics is universal, being also observed outside the coexistence region at low temperatures in the single phase region.

中文翻译：

液-气共存区内网络流体的动力学

当颗粒间相互作用的化合价受限时，在低温下形成分子或胶体的低密度网络。典型的例子是斑点粒子的网络，其中有限的价数是由高度定向的成对相互作用产生的。我们结合广泛的Langevin模拟和Wertheim的关联理论来研究这些网络。我们发现液-气共存区域内的无标度（松弛）动力学与通常观察到的各向同性粒子不同。对于各向同性的粒子，松弛动力学是由表面张力（粗化）驱动的，当化合价受到限制时，缓慢的松弛会通过形成中间的非平衡凝胶而进行。随机渗滤普遍性类别中的几何渗滤过渡。我们表明，缓慢的动力学是普遍的，在单相区域的低温下在共存区域之外也观察到了。

更新日期：2018-03-13

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