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arXiv 1911.02431cond-mat.softcond-mat.mtrl-sci
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短程吸引胶体悬浮体靶向组装的时间-速率-转换框架

Time-Rate-Transformation framework for targeted assembly of short-range attractive colloidal suspensions

Safa Jamali, Robert C. Armstrong, Gareth H. McKinley

摘要:

随着固体颗粒含量的变化,颗粒间吸引力或排斥力的范围、类型和强度的变化,吸引胶体的聚集现象已从理论和实验两个方面得到了广泛的研究。所得到的凝胶组成的有吸引力的胶体颗粒的无序组件,也已被调查方面的渗滤,相分离,以及所得到的分形网络的机械特性。尽管我们对凝胶化过程的理解取得了巨大进展,并探索了不同的途径来阻止有吸引力的胶体的动力学,但在这样的系统中,对流传输过程和多体效应之间的复杂相互作用限制了我们将系统推向特定配置的能力。在这里,我们研究了一个模型有吸引力的胶体系统在广泛的颗粒特性和流动条件下进行聚集远离平衡。系统的复杂多尺度动力学可以使用时间-速率-转换图来理解,该图改编自对嵌段共聚物、过冷液体和更硬的玻璃态金属中材料加工的理解,以指导有吸引力的胶体颗粒的有针对性的组装。

英文摘要:

The aggregation of attractive colloids has been extensively studied from both theoretical and experimental perspectives as the fraction of solid particles is changed, and the range, type and strength of attractive or repulsive forces between particles varies. The resulting gels consisting of disordered assemblies of attractive colloidal particles, have also been investigated with regards to percolation, phase separation, and the mechanical characteristics of the resulting fractal networks. Despite tremendous progress in our understanding of the gelation process, and the exploration of different routes for arresting the dynamics of attractive colloids, the complex interplay between convective transport processes and many-body effects in such systems has limited our ability to drive the system towards a specific configuration. Here we study a model attractive colloidal system over a wide range of particle characteristics and flow conditions undergoing aggregation far from equilibrium. The complex multiscale dynamics of the system can be understood using a Time-Rate-Transformation diagram adapted from understanding of materials processing in block copolymers, supercooled liquids and much stiffer glassy metals to direct targeted assembly of attractive colloidal particles.

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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