Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles
Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles
复制标题
二元毛状纳米颗粒组装的分层超结构
DOI：
10.1021/acsmacrolett.6b00176
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发表时间：
2016-06-01
影响因子：
7.015
通讯作者：
Qiu, Feng
中科院分区：
文献类型：
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作者：
Chen, Cangyi;Zhang, Tiancai;Qiu, Feng
利用自洽场理论研究了二元混合均聚物接枝纳米粒子组装的分级超结构。我们的研究结果表明，接枝混合均聚物刷提供了一种有效的方式来编程的纳米粒子的空间晶格排列。对于具有特定相互作用参数和总接枝密度的聚合物接枝纳米颗粒，在小的球形核/聚合物尺寸比（R/（root Nb）< 1）下获得不寻常的非密排简单立方（SC）晶格。当尺寸比增加到R/（root Nb）> 1时，纳米颗粒排列转变为体心立方（BCC）晶格。同时，在聚合物基体中形成了一些非常规的微相，如四方柱相和简单立方球相。此外，二维（2D）模型计算表明，二元毛状纳米粒子更喜欢排列成晶格的方式，他们可以保持作为一个孤立的粒子的自由能最小化的形态。我们的研究结果提出了一种可能的策略，设计由独特的无机/有机混合超结构组成的分级纳米材料。
Hierarchical superstructures assembled by binary mixed homopolymer-grafted nanoparticles are investigated by using a self-consistent field theory (SCFT). Our results demonstrate that grafting mixed homopolymer brushes provides an effective way to program the spatial lattice arrangement of the nanoparticles. For the polymer-grafted nanoparticles with specific interaction parameter and total grafting density, the unusual non-close-packed simple cubic (SC) crystal lattice is obtained at small spherical core/polymer size ratios (R/(root Nb) < 1). As the size ratio increases to R/(root Nb) > 1, the nanoparticle arrangement transforms into a body-centered cubic (BCC) crystal lattice. Meanwhile, some unconventional microphases are formed in the polymer matrix, such as the tetragonal cylinder and simple cubic sphere phases. Furthermore, the two-dimensional (2D) model calculations reveal that the binary hairy nanoparticles prefer to arrange into the lattice in a way they can maintain the free energy-minimizing morphology as an isolated particle. Our findings suggest a possible strategy to design hierarchical nanomaterials composed of unique inorganic/organic hybrid superstructures.