改性超支化聚甘油作为碳氢化合物中金纳米颗粒尺寸控制和稳定化的分散剂

Modified Hyperbranched Polyglycerol as Dispersant for Size Control and Stabilization of Gold Nanoparticles in Hydrocarbons.

作者信息

Shen Yanyu, He Guijin, Guo Yongsheng, Xie Hujun, Fang Wenjun

机构信息

Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.

Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou, 310018, China.

出版信息

Nanoscale Res Lett. 2017 Sep 6;12(1):525. doi: 10.1186/s11671-017-2296-1.

DOI:10.1186/s11671-017-2296-1

PMID:28875345

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5585120/

Abstract

Hyperbranched polyglycerol (HPG) is modified with dodecanethiol (DS) via the "thiol-ene" click reaction to obtain an amphiphilic product DSHPG. The molecular structures of DSHPG samples are characterized by NMR, FTIR, and GPC, and the thermal behaviors are characterized by DSC and TGA. Gold nanoparticles (Au NPs) are prepared with DSHPG as the stabilizer and surface-modification reagent. The size of Au NPs can be tuned by changing the molecular weight of HPG. It is observed that the HPG molecular weights of 1123, 3826, and 55,075 lead to the NP diameters of 4.1 nm for Au@DSHPG-1, 9.7 nm for Au@DSHPG-2, and 15.1 nm for Au@DSHPG-3, respectively. The morphology and size of Au NPs are characterized by TEM and DLS. Especially, the dispersion abilities of Au NPs in different pure solvents and co-solvent mixtures are investigated. The long alkyl chains on DSHPG give the ability of Au NPs to be well dispersed in nonpolar solvents. Hydrocarbon-based nanofluids can be obtained from the hydrophobic Au NPs dispersed into a series of hydrocarbons. The dispersion stability for Au NPs in hydrocarbons is monitored by UV-Vis spectroscopy, and the relative concentration of Au NPs is observed to still maintain over 80% after 3600 h.

摘要

通过“硫醇-烯”点击反应，用十二烷硫醇（DS）对超支化聚甘油（HPG）进行改性，得到两亲性产物DSHPG。通过核磁共振（NMR）、傅里叶变换红外光谱（FTIR）和凝胶渗透色谱（GPC）对DSHPG样品的分子结构进行表征，通过差示扫描量热法（DSC）和热重分析法（TGA）对其热行为进行表征。以DSHPG为稳定剂和表面改性剂制备金纳米颗粒（Au NPs）。通过改变HPG的分子量可以调节Au NPs的尺寸。观察到，HPG分子量为1123、3826和55075时，分别导致Au@DSHPG-1的纳米颗粒直径为4.1 nm、Au@DSHPG-2的为9.7 nm、Au@DSHPG-3的为15.1 nm。通过透射电子显微镜（TEM）和动态光散射（DLS）对Au NPs的形貌和尺寸进行表征。特别地，研究了Au NPs在不同纯溶剂和共溶剂混合物中的分散能力。DSHPG上的长烷基链使Au NPs能够很好地分散在非极性溶剂中。疏水性Au NPs分散到一系列碳氢化合物中可得到碳氢基纳米流体。通过紫外-可见光谱监测Au NPs在碳氢化合物中的分散稳定性，观察到3600小时后Au NPs的相对浓度仍保持在80%以上。