Freely Jointed Polymers Made of Droplets
Freely Jointed Polymers Made of Droplets
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DOI：
10.1103/physrevlett.121.138002
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发表时间：
2018-09-26
影响因子：
8.6
通讯作者：
Brujic, Jasna
中科院分区：
文献类型：
--
作者：
McMullen, Angus;Holmes-Cerfon, Miranda;Brujic, Jasna
自组装的一个重要目标是实现高保真的预编程结构。在这里，我们控制DNA功能化乳液的化合价，以制备线性和支化模型聚合物，或“胶体聚合物”。“簇大小的分布与聚合过程一致，在聚合过程中液滴达到其规定的价态。构象统计表明，链是自由连接的，因此库恩长度接近一个珠直径。端到端长度与键数N成比例，即N-v，其中v近似为3/4，与Flory理论在二维中一致。链扩散系数D近似地按D与N-v成比例缩放，如Zimm模型所预测的。与分子聚合物不同，胶体聚合物可以在温度循环下重复组装和拆卸，从而允许可重新配置的响应物质。
An important goal of self-assembly is to achieve a preprogrammed structure with high fidelity. Here, we control the valence of DNA-functionalized emulsions to make linear and branched model polymers, or "colloidomers." The distribution of cluster sizes is consistent with a polymerization process in which the droplets achieve their prescribed valence. Conformational statistics reveal that the chains are freely jointed, so that the Kuhn length is close to one bead diameter. The end-to-end length scales with the number of bonds N as N-v, where v approximate to 3/4, in agreement with the Flory theory in two dimensions. The chain diffusion coefficient D approximately scales as D proportional to N-v, as predicted by the Zimm model. Unlike molecular polymers, colloidomers can be repeatedly assembled and disassembled under temperature cycling, allowing for reconfigurable, responsive matter.