Synthesis of Monodisperse Magnetic Sandwiched Gold Nanoparticle as A Facilely Recyclable Catalyst with A Protective Polymer Shell
writer：Wei Zhang, Bin Liu, Bei Zhang, Guomin Bian, Yonglin Qi, Xinlin Yang*, Chenxi Li
keywords：Magnetic sandwiched gold nanoparticles; Recoverable catalsyst; Distillation precipitation polymerization.
source：期刊
specific source：Colloid Surf A466 (1), 210-218 (2015). DOI: 10.1016/j.colsurfa.2014.11.055
Issue time：2015年
Monodisperse magnetic sandwiched magnetite@gold/poly(ethyleneglycol
methacrylate) (Fe3O4@Au/PEGDMA) core-shell microspheres
were designed and prepared. The whole synthetic procedure mainly involved
hydrothermal method for preparation of magnetite core with subsequent
modification of (3-aminopropyl)trimethoxysilane (APS) for introduction of the
surface amino groups, distillation precipitation polymerization for preparation
of the P(EGDMA) shell and in situ reduction of gold precursor HAuCl4 for formation of the sandwiched Au
nanoparticles. The thicknesses of the outer polymeric shells were well-controlled
via altering the weight ratios of EGDMA monomers to
magnetite core during polymerization. The catalytic activity of the sandwiched Fe3O4-Au@P(EGDMA) magnetic
microsphere was studied by the reduction of 4-nitrophenol (4-NP) to
4-aminophenol (4-AnP) as a model reaction. These magnetic microspheres were
characterized by transmission electron microscopy (TEM), X-ray diffraction
(XRD), Furier-transform infrared spectra (FT-IR), thermogravimetric analysis
(TGA) and vibrating sample magnetometry (VSM).