文献类型：期刊文献

英文题名：Directed Nanoscale Self-Assembly of Low Molecular Weight Hydrogelators Using Catalytic Nanoparticles

作者：Wang, Yiming;Versluis, Frank[1];Oldenhof, Sander[1];Lakshminarayanan, Vasudevan[1];Zhang, Kai[1];Wang, Yunwei;Wang, Jie[2];Eelkema, Rienk[1];Guo, Xuhong[2];van Esch, Jan H.[1]

机构：[1]Delft Univ Technol, Dept Chem Engn, Adv Soft Matter Grp, Maasweg 9, NL-2629 HZ Delft, Netherlands;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2018

卷号：30

期号：21

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20181404983337);WOS:【SCI-EXPANDED(收录号:WOS:000434032600025)】；

基金：The authors thank J. M. Poolman for providing compounds 1 and 2, C. Maity for providing compound 4, F. Trausel for providing compound 5, and R. de Kruijff for help with cryo-TEM measurements. The authors are grateful to China Scholarship Council (CSC) and the Netherland Organization for Scientific Research (VIDI grant for R.E.) for financial support.

语种：英文

外文关键词：gels; local catalysis; low molecular weight gelators; nanofibers; self-assembly

摘要：The work presented here shows that the growth of supramolecular hydrogel fibers can be spatially directed at the nanoscale by catalytic negatively charged nanoparticles (NCNPs). The NCNPs with surfaces grafted with negatively charged polymer chains create a local proton gradient that facilitates an acid-catalyzed formation of hydrogelators in the vicinity of NCNPs, ultimately leading to the selective formation of gel fibers around NCNPs. The presence of NCNPs has a dominant effect on the properties of the resulting gels, including gelation time, mechanical properties, and network morphology. Interestingly, local fiber formation can selectively entrap and precipitate out NCNPs from a mixture of different nanoparticles. These findings show a new possibility to use directed molecular self-assembly to selectively trap target nano-objects, which may find applications in therapy, such as virus infection prevention, or engineering applications, like water treatment and nanoparticle separation.