Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.
Center for Soft Matter Research and Department of Physics, New York University, New York, NY 10003, USA.
Sci Adv. 2016 Aug 5;2(8):e1600881. doi: 10.1126/sciadv.1600881. eCollection 2016 Aug.
We report a study of reversible adsorption of DNA-coated colloids on complementary functionalized oil droplets. We show that it is possible to control the surface coverage of oil droplets using colloidal particles by exploiting the fact that, during slow adsorption, compositional arrest takes place well before structural arrest occurs. As a consequence, we can prepare colloid-coated oil droplets with a "frozen" degree of loading but with fully ergodic colloidal dynamics on the droplets. We illustrate the equilibrium nature of the adsorbed colloidal phase by exploring the quasi-two-dimensional phase behavior of the adsorbed colloids under the influence of depletion interactions and present simulations of a simple model that illustrates the nature of the compositional arrest and the structural ergodicity.
我们报告了一种关于 DNA 包覆胶体在互补功能化油滴上可逆吸附的研究。我们表明，通过利用这样一个事实，即缓慢吸附过程中，组成相分离会在结构相分离之前发生，因此可以使用胶体颗粒来控制油滴的表面覆盖率。这样，我们就可以制备具有“冻结”负载程度但在油滴上具有完全遍历胶体动力学的胶体包覆油滴。我们通过探索在耗尽相互作用影响下吸附胶体的准二维相行为来阐明吸附胶体相的平衡性质，并给出了一个简单模型的模拟结果，该模型说明了组成相分离和结构遍历的性质。
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