Collaborative Research: Exploiting Void Symmetries to Control the Self-Assembly of Nanoparticles

合作研究：利用空洞对称性来控制纳米颗粒的自组装

• 批准号: 1403049
• 负责人: Sanat Kumar
• 金额: $ 19.5万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1403049&HistoricalAwards=false
• 关键词: Collaborative; Research; Exploiting; Void; Symmetries

PI: Kumar, Sanat / Panagiotopoulos, Athanassios Proposal Number: 1403049 / 1402166 Institution: Columbia University / Princeton University Title: Collaborative Research: Exploiting Void Symmetries to Control the Self-Assembly of Nanoparticles The assembly of nanoparticles (NPs) into colloidal crystals is a promising way to obtain ordered nanocomposite materials with unique properties determined by the choice of the constituent NPs. If successful, this novel approach will have a significant impact on the ability of experimentalists to rationally design ordered colloidal crystals for a wide range of optical and catalytic applications, such as photonic crystals, optical switches and filters, and catalytic devices. The PIs have shown a novel way to selectively stabilize one crystal structure over another possible one by the use of polymers that can intercalate between the NPS. Essentially, the PIs have made an interesting discovery that, even when the energy, pressure, and packing fraction for two isomorphs, e.g., HCP and FCC, are the same, the distribution of voids within the crystals are different. By filling the voids with polymers of different length, they were able to show that one can selectively stabilize HCP over FCC crystals. Based on these findings, they propose to make use of this novel insight about void symmetries and size-distributions to select a desired polymorph from a suite of competing crystal structure. In this proposal, they propose to investigate what design principles are needed to achieve their goal.

PI：Kumar，Sanat / Panagiotopoulos，Athanassios 提案编号：1403049 / 1402166 机构：哥伦比亚大学/普林斯顿大学 标题：合作研究：利用空对称性来控制纳米颗粒的自组装 将纳米颗粒（NP）组装成胶体晶体是获得具有独特性能的有序纳米复合材料的一种有前途的方法 NP 组成部分的选择。如果成功，这种新颖的方法将对实验者合理设计有序胶体晶体的能力产生重大影响，这些晶体适用于广泛的光学和催化应用，例如光子晶体、光学开关和滤波器以及催化装置。 PI 展示了一种新颖的方法，通过使用可以插入 NPS 之间的聚合物，选择性地稳定一种晶体结构而不是另一种可能的晶体结构。从本质上讲，PI 们做出了一个有趣的发现，即即使两种同质体（例如 HCP 和 FCC）的能量、压力和堆积分数相同，晶体内空隙的分布也是不同的。通过用不同长度的聚合物填充空隙，他们能够证明可以选择性地稳定 HCP 而不是 FCC 晶体。基于这些发现，他们建议利用这种关于空隙对称性和尺寸分布的新颖见解，从一组竞争晶体结构中选择所需的多晶型物。在该提案中，他们建议调查实现其目标需要哪些设计原则。