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Quadruple‐Responsive Nanocomposite Based on Dextran–PMAA–PNIPAM, Iron Oxide Nanoparticles, and Gold Nanorods
Author(s) -
Feng Wenqian,
Lv Weipeng,
Qi Junjie,
Zhang Guoliang,
Zhang Fengbao,
Fan Xiaobin
Publication year - 2012
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201100595
Subject(s) - nanorod , nanocomposite , copolymer , materials science , dextran , methacrylic acid , superparamagnetism , nanoparticle , chemical engineering , polymer chemistry , polymerization , nanotechnology , chemistry , polymer , magnetization , organic chemistry , composite material , magnetic field , physics , quantum mechanics , engineering
A quadruple‐responsive nanocomposite that responds to temperature, pH, magnetic field, and NIR is obtained by incorporating superparamagnetic iron oxide nanoparticles (SPIONs) and gold nanorods (AuNRs) into a dextran‐based smart copolymer network. The dual‐sensitive copolymer is prepared by sequential RAFT polymerization of methacrylic acid and N ‐isopropylacrylamide from trithiocarbonate groups linked to dextran in one pot. These functionalized nanocomposites with superior stability can respond to the four stimuli mentioned above well. As evidenced by UV–vis and TEM measurements, the temperature‐induced unusual blue‐shift in the longitudinal plasmon band is possibly due to the side‐to‐side assembly of AuNRs.