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Surface-Reactive Patchy Nanoparticles and Nanodiscs Prepared by Tandem Nanoprecipitation and Internal Phase Separation

机译:通过串联纳米沉淀和内相分离制备的表面反应性斑片状纳米颗粒和纳米圆盘

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摘要

Nanoparticles with structural or chemical anisotropy are promising materials in domains as diverse as cellular delivery, photonic materials, or interfacial engineering. The surface chemistry may play a major role in some of these contexts. Introducing reactivity into such polymeric nanomaterials is thus of great potential, yet is still a concept in its infancy. In the current contribution, a simple nanoprecipitation technique leads to nanoparticles with diameters as low as 150 nm and well-defined reactive surface patches of less than 30 nm in width, as well as surface-reactive flat, disc-like nanoparticles with corresponding dimensions, via an additional crosslinking/delamination sequence. To this aim, chemically doped block copolymers (BCPs) are employed. Control over morphology is attained by tuning preparation conditions, such as polymer concentration, solvent mixture composition, and blending with non-functional BCP. Surface reactivity is demonstrated using a modular ligation method for the site-selective immobilization of thiol molecules. The current approach constitutes a straightforward methodology requiring minimal engineering to produce nanoparticles with confined surface reactivity and/or shape anisotropy.
机译:具有结构或化学各向异性的纳米粒子在细胞递送,光子材料或界面工程等领域中是很有前途的材料。在某些情况下,表面化学可能起主要作用。因此,将反应性引入这样的聚合物纳米材料中具有巨大的潜力,但是在其初期仍是一个概念。在目前的贡献中,一种简单的纳米沉淀技术可产生直径低至150 nm且宽度小于30 nm的明确定义的反应性表面斑块的纳米颗粒,以及具有相应尺寸的表面反应性扁平盘状纳米颗粒,通过附加的交联/分层顺序。为了这个目的,使用化学掺杂的嵌段共聚物(BCP)。通过调节制备条件,例如聚合物浓度,溶剂混合物组成以及与非功能性BCP的掺混,可以控制形态。使用模块化连接方法对硫醇分子进行位点固定化,证明了表面反应性。当前的方法构成了一种简单的方法,需要最少的工程来生产具有有限的表面反应性和/或形状各向异性的纳米颗粒。

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