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arXiv 2312.04490cond-mat.softphysics.chem-ph
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在水溶液中组装 PNIPAM 封端的金纳米颗粒

Assembling PNIPAM-Capped Gold Nanoparticles in Aqueous Solutions

Binay P. Nayak, Hyeong Jin Kim, Srikanth Nayak, Wenjie Wang, Wei Bu, Surya K. Mallapragada, David Vaknin

AI总结:

该研究利用 SAXS 考察 PNIPAM 接枝 AuNP 的组装条件,发现需在升温超过 LCST 的同时加入电解质或聚电解质,且链长会改善团簇有序性。

摘要:

利用小角 X 射线散射(SAXS),我们探究了接枝有热敏聚合物聚(N-异丙基丙烯酰胺)(PNIPAM)的金纳米颗粒(AuNPs)发生组装的条件。我们发现,通过加入电解质或聚电解质,并将悬浮液温度升高至 PNIPAM 的最低临界溶解温度(LCST)以上,会形成短程有序的组装体。结果表明,PNIPAM 链越长,组装团簇中的组织性越好。有趣的是,在不添加电解质的情况下,没有证据表明 AuNP 组装随温度发生变化,尽管已知未接枝的 PNIPAM 在其 LCST 以上会发生从线团到球的转变。本研究展示了另一种方法,即利用 PNIPAM 的独特性质来组装可用于器件的潜在热敏纳米结构。

英文摘要:

Employing small angle X-ray scattering (SAXS), we explore the conditions under which the assembly of gold nanoparticles (AuNPs) grafted with the thermo-sensitive polymer Poly(N-isopropylacrylamide) (PNIPAM) emerges. We find that short-range order assembly emerges by combining the addition of electrolytes or poly-electrolytes with raising the temperature of the suspensions above the lower-critical solution temperature (LCST) of PNIPAM. Our results show that the longer the PNIPAM chain is, the better organization in the assembled clusters. Interestingly, without added electrolytes, there is no evidence of AuNP assembly as a function of temperature, although untethered PNIPAM is known to undergo a coil-to-globule transition above its LCST. This study demonstrates another approach to assembling potential thermo-sensitive nanostructures for devices by leveraging the unique properties of PNIPAM.

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