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Reconfigurable Polymer Shells on Shape‐Anisotropic Gold Nanoparticle Cores
Macromolecular Rapid Communications ( IF 4.6 ) Pub Date : 2018-05-03 , DOI: 10.1002/marc.201800101
Juyeong Kim 1, 2 , Xiaohui Song 1, 2 , Ahyoung Kim 1 , Binbin Luo 1 , John W. Smith 1 , Zihao Ou 1 , Zixuan Wu 1 , Qian Chen 1, 2, 3, 4
Affiliation  

Reconfigurable hybrid nanoparticles made by decorating flexible polymer shells on rigid inorganic nanoparticle cores can provide a unique means to build stimuli‐responsive functional materials. The polymer shell reconfiguration has been expected to depend on the local core shape details, but limited systematic investigations have been undertaken. Here, two literature methods are adapted to coat either thiol‐terminated polystyrene (PS) or polystyrene‐poly(acrylic acid) (PS‐b‐PAA) shells onto a series of anisotropic gold nanoparticles of shapes not studied previously, including octahedron, concave cube, and bipyramid. These core shapes are complex, rendering shell contours with nanoscale details (e.g., local surface curvature, shell thickness) that are imaged and analyzed quantitatively using the authors' customized analysis codes. It is found that the hybrid nanoparticles based on the chosen core shapes, when coated with the above two polymer shells, exhibit distinct shell segregations upon a variation in solvent polarity or temperature. It is demonstrated for the PS‐b‐PAA‐coated hybrid nanoparticles, the shell segregation is maintained even after a further decoration of the shell periphery with gold seeds; these seeds can potentially facilitate subsequent deposition of other nanostructures to enrich structural and functional diversity. These synthesis, imaging, and analysis methods for the hybrid nanoparticles of anisotropically shaped cores can potentially aid in their predictive design for materials reconfigurable from the bottom up.

中文翻译:

形状各向异性金纳米粒子核上的可重构聚合物壳

通过在刚性无机纳米颗粒核上装饰柔性聚合物壳而制成的可重构杂化纳米颗粒,可以提供一种独特的方法来构建刺激反应性功能材料。预期聚合物壳的重构取决于局部芯的形状细节,但是已经进行了有限的系统研究。在这里,有两种文献方法适用于涂覆巯基封端的聚苯乙烯(PS)或聚苯乙烯-聚(丙烯酸)(PS- b)‐PAA)壳层到一系列各向异性的金纳米颗粒上,这些纳米颗粒的形状以前没有研究过,包括八面体,凹面立方体和双锥体。这些核心形状很复杂,呈现出具有纳米级细节(例如局部表面曲率,壳厚度)的外壳轮廓,这些轮廓使用作者的自定义分析代码进行了成像和定量分析。发现基于选定的核形状的杂化纳米颗粒当涂覆有上述两个聚合物壳时,在溶剂极性或温度变化时表现出明显的壳偏析。PS‐ b进行了演示‐PAA包覆的杂化纳米颗粒,即使用金种子进一步装饰了外壳外围,也能保持外壳分离;这些种子可以潜在地促进其他纳米结构的后续沉积,以丰富结构和功能的多样性。这些用于各向异性形状核的杂化纳米粒子的合成,成像和分析方法可能有助于其从下至上可重构材料的预测设计。
更新日期:2018-05-03
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