Temperature and anion responsive self-assembly of ionic liquid block copolymers coating gold nanoparticles

Junbo LI, Jianlong ZHAO, Wenlan WU, Ju LIANG, Jinwu GUO, Huiyun ZHOU, Lijuan LIANG

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Front. Mater. Sci. ›› 2016, Vol. 10 ›› Issue (2) : 178-186. DOI: 10.1007/s11706-016-0334-z
RESEARCH ARTICLE
RESEARCH ARTICLE

Temperature and anion responsive self-assembly of ionic liquid block copolymers coating gold nanoparticles

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Abstract

In this paper, double hydrophilic ionic liquid block copolymers (ILBCs), poly poly[1-methyl-3-(2-methacryloyloxy propylimidazolium bromine)]-block-(N-isopropylacrylamide) (PMMPImB-b-PNIPAAm) was first synthesized by reversible addition-fragmentation chain transfer (RAFT) and then attached on the surface of gold nanoparticles (Au NPs) via a strong gold-sulfur bonding for preparing hybrid nanoparticles (PMMPImB-b-PNIPAAm-@-Au NPs). The hybrid NPs had a three layers micelle-like structure, including a gold core, thermo-responsive inner shell and anion responsive outer corona. The self-assembling behavior of thermal- and anion-response from shell and corona were respectively investigated by change of temperature and addition of (CF3SO2)2N-. The results showed the hybrid NPs retained a stable dispersion beyond the lower critical solution temperature (LCST) because of the space or electrostatic protecting by outer PMMPImB. However, with increasing concentration of (CF3SO2)2N-, the micellization of self-assembling PMMPImB-b-PNIPAAm-@-Au NPs was induced to form micellar structure containing the core with hydrophobic PMMPImB-(CF3SO2)2N- surrounded by composite shell of Au NPs-PNIPAAm via the anion-responsive properties of ILBCs. These results indicated that the block copolymers protected plasmonic nanoparticles remain self-assembling properties of block copolymers when phase transition from outer corona polymer.

Keywords

block copolymer / dual stimuli-responsive / gold nanoparticles (Au NPs) / self-assembly

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Junbo LI, Jianlong ZHAO, Wenlan WU, Ju LIANG, Jinwu GUO, Huiyun ZHOU, Lijuan LIANG. Temperature and anion responsive self-assembly of ionic liquid block copolymers coating gold nanoparticles. Front. Mater. Sci., 2016, 10(2): 178‒186 https://doi.org/10.1007/s11706-016-0334-z
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Acknowledgements

We acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51103035 and 51403055).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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