纳米棒的类聚合组装行为研究

刘晓娜; 高梁; 王立权; 张承岩; 林嘉平

doi:10.11777/j.issn1000-3304.2018.18082

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纳米棒的类聚合组装行为研究

研究论文 | 更新时间：2021-01-26

- 纳米棒的类聚合组装行为研究
- Polymerization-like Assembly Behavior of the Nanorods
- 高分子学报 2018年0卷第10期页码：1279-1286
- 作者机构：
  
  华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室　上海 200237
- 作者简介：
  
  E-mail: lq_wang@ecust.edu.cn Li-quan Wang, lq_wang@ecust.edu.cn
  E-mail: jlin@ecust.edu.cn Jia-ping Lin, E-mail: jlin@ecust.edu.cn
- 基金信息：
  
  国家自然科学基金(基金号 21774032)和中央高校基本科研业务费(项目号 222201714042)资助项目()
- DOI：10.11777/j.issn1000-3304.2018.18082
  中图分类号：
- 纸质出版日期：2018-10，
  
  收稿日期：2018-3-16，
  
  修回日期：2018-3-27，
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刘晓娜, 高梁, 王立权, 张承岩, 林嘉平. 纳米棒的类聚合组装行为研究[J]. 高分子学报, 2018,0(10):1279-1286.

Xiao-na Liu, Liang Gao, Li-quan Wang, Cheng-yan Zhang, Jia-ping Lin. Polymerization-like Assembly Behavior of the Nanorods[J]. Acta Polymerica Sinica, 2018,0(10):1279-1286.
刘晓娜, 高梁, 王立权, 张承岩, 林嘉平. 纳米棒的类聚合组装行为研究[J]. 高分子学报, 2018,0(10):1279-1286. DOI： 10.11777/j.issn1000-3304.2018.18082.

Xiao-na Liu, Liang Gao, Li-quan Wang, Cheng-yan Zhang, Jia-ping Lin. Polymerization-like Assembly Behavior of the Nanorods[J]. Acta Polymerica Sinica, 2018,0(10):1279-1286. DOI： 10.11777/j.issn1000-3304.2018.18082.

摘要

构建了两端修饰有疏水聚合物的纳米棒模型，利用布朗动力学模拟研究了其组装行为，考察了溶剂选择性、纳米棒长度和纳米棒浓度等因素对组装行为的影响. 研究表明，纳米棒可发生类似于高分子聚合的组装行为，在大部分情况下，其动力学符合高分子逐步聚合原理. 但是，当纳米棒浓度较高或聚合物溶解性较好时，纳米棒的增长难以用逐步聚合原理来描述. 本研究工作阐明了纳米棒的类聚合组装动力学，可为一维多级有序结构的设计和制备提供思路.

Abstract

Step-wise self-assembly is a promising strategy to construct assemblies with higher-level hierarchy and complexity. In this self-assembly

the primary assemblies can self-assemble into one-dimensional structures in a way similar to the synthesis of polymers. However

the questions such as whether the principle of polymerization can apply to the one-dimensional growth of the assemblies still need to be clarified. To address this question

Brownian dynamics simulation was used to investigate the self-assembly of the nanorods with two ends capped with hydrophobic polymers such as polystyrenes. In the Brownian dynamics simulation

the amphiphility was simulated by choosing different cutt-off distances of the Lennard-Jones potentials for the nanorods and polymers. It was found that the nanorods associated with each other into chain-like structures

via

end-to-end connection

due to the hydrophobility of the polymers. The effects of the solvent selectivity

the length of the nanorods

and the concentration of the nanorods on the self-assembly were examined. The self-assembly of the nanorods into chain-like structures resembles the covalent polymerization of the monomers. The kinetics of the polymerization follows the rule of the step-growth polymerization in most of the cases. As the length of the nanorods or the concentration of the nanorods increases

the degrees of the polymerization show a more rapid increase as a function of time. For the effect of the solvent selectivity

the nanorods are found to be " polymerized” more rapidly as the solubility of the polymers decreases. However

as the solubilty of the polymers is low enough

the " polymerization” behavior is remarkedly less influenced by the solvent selectivity. Note that the rule of the step-growth polymerization cannot apply to the one-dimensional self-assembly of the nanorods when the concentration of the nanorods or the solubility of the polymer is higher. In addition

we found that the nanorods can self-assemble into ring-like structures with various numbers of nanorods

via

designing nanorods with adjustable chamfers at two ends. The observations are well consistent with some available experimental findings regarding the self-assembly of gold nanorods coated with a bilayer of cetyl trimethyl ammonium bromide along its sides and thiol-terminated polystyrene at two ends. The work can help to understand the dynamics of the self-assembly and designing one-dimensional ordered microstructures in future.

关键词

自组装聚合组装动力学布朗动力学

Keywords

Self-assemblyPolymerizationAssembly kineticsBrownian dynamics

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