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arXiv 2406.08618cond-mat.soft
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DNA结合液滴黏附与变形的热力学方法

A thermodynamic approach to adhesion and deformation of DNA-bound droplets

Nicolas Judd, Angus McMullen, Sascha Hilgenfeldt, Jasna Brujic

AI总结:

本文提出并实验验证描述DNA包覆乳液液滴黏附的自由能泛函,统一预测黏附尺寸、形貌与结合剂浓度,定量得到3.7±0.3 k_B T的弱有效结合强度。

摘要:

我们推导并通过实验检验了一个自由能泛函,用以描述包覆DNA的乳液液滴的黏附行为。该理论推广了以往方法,综合考虑了微观DNA力学与液滴弹性的重要能量效应和熵效应。它能够同时预测黏附尺寸、形貌以及结合剂浓度随实验控制参数的变化。值得注意的是,在特征DNA覆盖度下,液滴从未变形结合转变为平坦的液滴界面。这些平衡预测与液滴—基底及液滴—液滴结合实验在定量上吻合,并揭示出由于熵耗散导致的弱有效结合强度为3.7±0.3 k_B T。研究结果为构建丰富的胶体结构设计策略开辟了道路。

英文摘要:

Here we derive and experimentally test a free energy functional that captures the adhesion of DNA-coated emulsion droplets. Generalizing previous approaches, the theory combines important energetic and entropic effects of microscopic DNA mechanics and droplet elasticity. It simultaneously predicts adhesion size, morphology, and binder concentration as a function of experimental control parameters. Notably, droplets transition from undeformed binding to flat droplet interfaces at a characteristic DNA coverage. These equilibrium predictions agree quantitatively with experiments on droplet-substrate and droplet-droplet binding, revealing a weak effective binding strength of $3.7\pm0.3\text{k}_{\text{B}}\text{T}$ owing to entropic costs. Our results open the path to rich design strategies for making colloidal architectures.

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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