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Self-assembly of finite-sized colloidal aggregates.
Soft Matter ( IF 2.9 ) Pub Date : 2020-05-26 , DOI: 10.1039/d0sm00234h
Pritam Kumar Jana 1 , Bortolo Matteo Mognetti
Affiliation  

One of the challenges of self-assembling finite-sized colloidal aggregates with a sought morphology is the necessity of precisely sorting the position of the colloids at the microscopic scale to avoid the formation of off-target structures. Microfluidic platforms address this problem by loading into single droplets the exact amount of colloids entering the targeted aggregate. Using theory and simulations, in this paper, we validate a more versatile design allowing us to fabricate different types of finite-sized aggregates, including colloidal molecules or core–shell clusters, starting from finite density suspensions of isotropic colloids in bulk. In our model, interactions between particles are mediated by DNA linkers with mobile tethering points, as found in experiments using DNA oligomers tagged with hydrophobic complexes immersed into supported bilayers. By fine-tuning the strength and number of the different types of linkers, we prove the possibility of controlling the morphology of the aggregates, in particular, the valency of the molecules and the size of the core–shell clusters. In general, our design shows how multivalent interactions can lead to microphase separation under equilibrium conditions.

中文翻译:

有限尺寸的胶体聚集体的自组装。

具有所需形态的自组装有限尺寸胶体聚集体的挑战之一是必须在微观尺度上精确地分选胶体位置,以避免形成脱靶结构。微流体平台通过将进入目标聚集体的准确数量的胶体装载到单个液滴中来解决此问题。利用理论和模拟,在本文中,我们验证了更通用的设计,使我们能够从散装各向同性胶体的有限密度悬浮液中制造出不同类型的有限尺寸的聚集体,包括胶体分子或核-壳簇。在我们的模型中,粒子之间的相互作用是由带有可移动束缚点的DNA接头介导的,如在使用标记有疏水复合物的DNA低聚物浸入支持的双层中进行的实验中所发现的。通过微调不同类型接头的强度和数量,我们证明了控制聚集体形态的可能性,尤其是控制分子的化合价和核-壳簇大小的可能性。通常,我们的设计显示了多价相互作用如何在平衡条件下导致微相分离。
更新日期:2020-07-01
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