作者：Guangyu Liu, Hongfen Ji, Xinlin Yang*, Yongmei Wang
关键字：Hollow polymer microsphere; Movable core; Rattle-type microsphere; Gold nanocolloids
论文来源：期刊
具体来源：Langmuir, 24 (2), 1029-1035 (2008). DOI: 10.1021/la7025957
发表时间：2008年
Gold/silica/poly(N,N￠-methylenebisacrylamide) (Au/SiO2/polyMBAAm) trilayer composite materials were prepared by distillation precipitation polymerization of N,N￠-methylenebisacrylamide (MBAAm) in the presence of Au/SiO2 particles as seeds, in which the seeds were prepared by a combination of gold-complexing and silane coupling agent
with a further modified Sto¨ber method. The polymerization of MBAAm was performed in neat acetonitrile with 2,2￠-azobisisobutyronitrile as an initiator to encapsulate the Au/SiO2 seeds driven by the hydrogen-bonding interaction between the hydroxyl group on the surface of the seeds and the amide unit of polyMBAAm without modification of the Au/SiO2 surface in the absence of any stabilizer or surfactant. Hollow polyMBAAm microspheres with movable Au cores were further developed by the selective removal of the middle silica layer with hydrofluoric acid. The resultant trilayer Au/SiO2/polyMBAAm composite and hollow polyMBAAm microspheres with movable Au cores were characterized by transmission electron microscopy. The diffusion of chemicals across the polyMBAAm shell was investigated by a catalytic reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride as a reductant.