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Thermosensitive Copolymer Networks Modify Gold Nanoparticles for Nanocomposite Entrapment
Author(s) -
Li Dongxiang,
He Qiang,
Cui Yue,
Wang Kewei,
Zhang Xiaoming,
Li Junbai
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600839
Subject(s) - copolymer , atom transfer radical polymerization , colloidal gold , materials science , nanoparticle , polymer chemistry , fourier transform infrared spectroscopy , chemical engineering , aqueous solution , polymerization , nanocomposite , nanostructure , nanotechnology , chemistry , polymer , organic chemistry , composite material , engineering
The core‐shell gold nanoparticles and copolymer of N ‐isopropylacrylamide (NIPAM) and N , N ′‐methylenebisacrylamide (MBAA) hybrids (Au@copolymer) were fabricated through surface‐initiated atom‐transfer radical polymerization (ATRP) on the surface of gold nanoparticles in 2‐propanol/water mixed solvents. The surface of citrate‐stabilized gold nanoparticles was first modified by a disulfide initiator for ATRP. The slight cross‐linking polymerization between NIPAM and MBAA occurred on the gold surface and resulted in the formation of core‐shell Au@copolymer nanostructures that were characterized by TEM, and FTIR and UV‐visible spectroscopy. Such synthesized Au@copolymer hybrids possess clearly thermosensitive properties and exhibit “inspire” and “expire” water behavior in response to temperature changes in aqueous solution. Because of this property, we enable to trap and encapsulate smaller nanoparticles by using the free space of the copolymer‐network scaffold anchored at the gold surface.