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Soft patchy nanoparticles from solution-phase self-assembly of binary diblock copolymers

机译：二元二嵌段共聚物溶液相自组装的软质纳米颗粒

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摘要

The fabrication of highly ordered, defect-free nanostructures is a key challenge in nanotechnology. Bottom-up fabrication approaches require nanobuilding blocks of precisely defined size and shape. In this work we propose a simple approach to obtain one type of building block-soft patchy nanoparticles-suggested by a series of coarse grain molecular dynamics simulations. A binary mixture of two different diblock copolymers with a common hydrophobic block but sufficiently dissimilar hydrophilic blocks reliably self-assembles into a "patchy" spherical micelle in water, with phase separation of the two hydrophilic blocks on the surface of the micelle core. Subsequent crosslinking of the core to solidify the patchy sphere geometry should allow further hierarchical assembly. Altering the hydrophilic versus hydrophobic composition of each polymer yields a change of morphology from "patchy spheres" to "patchy cylinders". Furthermore, by controlling the interaction strength of the blocks with solvent, the patches can be selectively placed either on the outer surface or inside the core of the micelle. The number and size of the patches are found to be largely controlled by the composition of the binary copolymer mixture.
机译：高度有序，无缺陷的纳米结构的制造是纳米技术中的关键挑战。自下而上的制造方法需要精确定义尺寸和形状的纳米构件。在这项工作中，我们提出了一种简单的方法来获得一种类型的构建基块-软斑块状纳米颗粒，这是由一系列粗粒分子动力学模拟所建议的。两种不同的二嵌段共聚物与一个普通的疏水嵌段但亲水性足够不同的二元混合物可以可靠地自组装成水中的“斑点”球形胶束，并且两个亲水性嵌段在胶束核心表面发生相分离。随后使核交联以固化斑驳的球形几何结构，应允许进一步的分层组装。改变每种聚合物的亲水性与疏水性组成会导致形态从“斑点球”变为“斑点圆柱”。此外，通过控制嵌段与溶剂的相互作用强度，可以将胶布选择性地放置在胶束的外表面或内核内部。发现贴剂的数量和大小在很大程度上由二元共聚物混合物的组成控制。

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