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锚定在金纳米颗粒表面的聚（N-异丙基丙烯酰胺）的构象稳定性

Conformational Stability of Poly (N-Isopropylacrylamide) Anchored on the Surface of Gold Nanoparticles.

作者信息

Li Runmei, Cheng Cong, Wang Zhuorui, Gu Xuefan, Zhang Caixia, Wang Chen, Liang Xinyue, Hu Daodao

机构信息

Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, China.

College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China.

出版信息

Materials (Basel). 2021 Jan 18;14(2):443. doi: 10.3390/ma14020443.

DOI:10.3390/ma14020443
PMID:33477518
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7831095/
Abstract

To verify the temperature sensitive failure of poly (N-isopropylacrylamide) (PNIPAM) anchored on the surface of gold nanoparticles (AuNPs), the UV-Vis spectra with temperature variations of the following aqueous solutions respectively containing AuNPs-PNIPAM, Au-PNIPAM/PNIPAM, PNIPAM, in different media (including salt, ethanol, HCl and cetyltrimethylammoniumbromide (CTAB)), were systematically determined. The results indicated that the UV-Vis spectrum of AuNPs-PNIPAM suspension hardly changed even above the Lower Critical Solution Temperature (LCST) of PNIPAM, but that of Au-PNIPAM/PNIPAM sharply increased only in absorbance intensity. A possible mechanism of the failed temperature sensitivity of PNIPAM anchored on the surface of AuNPs was proposed. Being different from free PNIPAM molecules, a strong interaction exists among PNIPAM molecules anchored on the surface of AuNPs, restraining the change in conformation of PNIPAM. The temperature sensitivity of Au-PNIPAM/PNIPAM originates from the free PNIPAM molecules rather than the anchored PNIPAM one. The changing electrostatic interaction could effectively regulate the aggregation behavior of AuNPs-PNIPAM and enhance its sensitivity to temperature.

摘要

为了验证锚定在金纳米颗粒（AuNPs）表面的聚（N-异丙基丙烯酰胺）（PNIPAM）的温度敏感失效情况，分别系统测定了在不同介质（包括盐、乙醇、盐酸和十六烷基三甲基溴化铵（CTAB））中，含有AuNPs-PNIPAM、Au-PNIPAM/PNIPAM、PNIPAM的下列水溶液随温度变化的紫外-可见光谱。结果表明，即使在PNIPAM的低临界溶液温度（LCST）以上，AuNPs-PNIPAM悬浮液的紫外-可见光谱几乎没有变化，但Au-PNIPAM/PNIPAM的紫外-可见光谱仅在吸光度强度上急剧增加。提出了一种锚定在AuNPs表面的PNIPAM温度敏感性失效的可能机制。与游离的PNIPAM分子不同，锚定在AuNPs表面的PNIPAM分子之间存在强相互作用，抑制了PNIPAM构象的变化。Au-PNIPAM/PNIPAM的温度敏感性源于游离的PNIPAM分子，而不是锚定的PNIPAM分子。变化的静电相互作用可以有效地调节AuNPs-PNIPAM的聚集行为，并增强其对温度的敏感性。

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