Citation: 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 shu

Polymerization-like Assembly Behavior of the Nanorods

Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237

Corresponding author: Li-quan Wang, lq_wang@ecust.edu.cn Jia-ping Lin, jlin@ecust.edu.cn
Received Date: 16 March 2018
Revised Date: 27 March 2018
Available Online: 19 July 2018

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.
- Self-assembly,
- Polymerization,
- Assembly kinetics,
- Brownian dynamics
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