自组装
化学物理
纳米技术
聚合物
恐溶剂的
纳米棒
刷子
聚苯乙烯
材料科学
分子动力学
胶体
化学
分子
复合材料
物理化学
计算化学
有机化学
作者
Shayan Vazirieh Lenjani,Cheng-Wu Li,Sezer Seçkin,Tobias König,Holger Merlitz,Jens‐Uwe Sommer,Christian Roßner
出处
期刊:Langmuir
[American Chemical Society]
日期:2024-01-05
标识
DOI:10.1021/acs.langmuir.3c02207
摘要
The solvophobicity-driven directional self-assembly of polymer-coated gold nanorods is a well-established phenomenon. Yet, the kinetics of this process, the origin of site-selectivity in the self-assembly, and the interplay of (attractive) solvophobic brush interactions and (repulsive) electrostatic forces are not fully understood. Herein, we use a combination of time-resolved (vis/NIR) extinction spectroscopy and finite-difference time-domain (FDTD) simulations to determine conversion profiles for the assembly of gold nanorods with polystyrene shells of distinct thicknesses into their (tip-to-tip) self-assembled structures. In particular, we demonstrate that the assembly process is highly protracted compared with diffusion-controlled rates, and we find that the assembly rate varies for different thickness values of the polymer shell. Our findings were rationalized using coarse-grained molecular dynamics simulations, which also corroborated the tip-to-tip preference in the self-assembly process, albeit with a uniform polymer coating. Utilizing the knowledge of quantified conversion rates for distinct colloidal species, we designed coassembling systems with different brush thicknesses, featuring “narcissistic” self-sorting behavior. This provides new perspectives for high-level supracolloidal self-assembly.
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