Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles

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• 作者：Cangyi Chen ; Tiancai Zhang ; Lei Zhu ; Bin Zhao ; Ping Tang ; Feng Qiu
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：June 21, 2016
• 年：2016
• 卷：5
• 期：6
• 页码：718-723
• 全文大小：422K
• 年卷期：0
• ISSN：2161-1653

文摘

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/() < 1). As the size ratio increases to > 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.