Preparation and catalytic performance of temperature-responsive cell-like particles
Yang, Q.; Dai, Z.; Guo, W.; Chu, Y.; Chen, G.
Pakistan Journal of Pharmaceutical Sciences 27(5 Suppl): 1611-1614
2014
ISSN/ISBN: 1011-601X PMID: 25262506 Document Number: 675999
A novel kind of cell-like particles as temperature-responsive catalysts was presented in this paper. First, uniform α-Fe₂O₃shuttle-like nanoparticles were prepared by homogeneous hydrolysis. Then, these α-Fe₂O₃particles were coated by Au nanoparticles (AuNPs), SiO₂and poly (N-isopropylacrylamide) (PNIPAM), respectively. After the removal of SiO₂layer by etching with HF solution, the cell-like particles were prepared when the α-Fe₂O₃, AuNPs, and PNIPAM were as cell nucleus, catalysts, and cell membranes, respectively. These cell-like particles showed a novel temperature-responsively catalytic performance because the PNIPAM shell could change its hydrophilicity and swelling capacity under different temperature. When the temperature was 25°C, the yield of 4-aminophenol (4-AP) from 4-nitrophenol (4-NP) by reduction of NaBH₄was about 100% in 15 min, while the yield of 4-AP was about 90.5% in 40 min. when the temperature was 40°C.