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arXiv 1407.0405cond-mat.soft
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有色斑片状粒子:特定相互作用对液体结构的影响

Chromatic patchy particles: effects of specific interactions on liquid structure

Oleg A. Vasilyev, Boris A. Klumov, Alexei V. Tkachenko

摘要:

我们研究了片状颗粒液体的结构和热力学性质,特别关注“颜色”的作用,即单个补丁之间的特定相互作用。一个可能的实验实现这种“彩色”的相互作用是通过装饰与单链DNA接头的颗粒补丁。接头的互补性可以促进预定的贴片对之间的选择性键形成。利用分子动力学模拟,我们比较了“有色”和“无色”体系形成的聚集体的局部连通性、键取向顺序和其他结构性质。分析是做两个不同的补丁安排(四面体和立方)的球形颗粒。结果发现,“无色”片状颗粒的聚集(液体)相是更好地连接,密度和通常具有较强的局部秩序比相应的“有色”的。这反过来又使有色液体在化学上不太稳定。具体来说,我们预测,在一个典型的情况下,色相互作用应该增加相对于无序液体的结晶相的相对稳定性,从而扩大其区域的相图。

英文摘要:

We study the structural and thermodynamic properties of patchy particle liquids, with a special focus on the role of "color", i.e. specific interactions between individual patches. A possible experimental realization of such "chromatic" interactions is by decorating the particle patches with single-stranded DNA linkers. The complementarity of the linkers can promote selective bond formation between predetermined pairs of patches. By using MD simulations, we compare the local connectivity, the bond orientation order, and other structural properties of the aggregates formed by the "colored" and "colorless" systems. The analysis is done for spherical particles with two different patch arrangements (tetrahedral and cubic). It is found that the aggregated (liquid) phase of the "colorless" patchy particles is better connected, denser and typically has stronger local order than the corresponding "colored" one. This, in turn, makes the colored liquid less stable thermodynamically. Specifically, we predict that in a typical case the chromatic interactions should increase the relative stability of the crystalline phase with respect to the disordered liquid, thus expanding its region in the phase diagram.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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