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Indexed by:期刊论文

Date of Publication:2011-11-01

Journal:Gongneng Cailiao/Journal of Functional Materials

Included Journals:EI、PKU、ISTIC、Scopus

Volume:42

Issue:SUPPL. 5

Page Number:912-915+919

ISSN No.:10019731

Abstract:Fe 3O 4 nanoparticles prepared by coprecipitation method were surface functionalized with the silane coupling agent of 3-methacryloylpropyl trimethoxysilane (MPS), then the MPS on the surface of Fe 3O 4 nanoparticles was copolymerized with the quaternary ammonium salt monomers (quaternization of dimethylaminoethyl methacrylate with benzyl bromide or bromohexane) by free radical polymerization, and the recyclable antibacterial polycation grafted Fe 3O 4 magnetic nanoparticles (pQAC-Fe 3O 4) were obtained. The morphology and surface composition of nanoparticles was characterized by XRD, FT-IR, DLS, TEM and TGA. It was found that pQAC-Fe 3O 4 nanoparticles showed a wide spectrum of excellent antibacterial activity in vitro by the colony count method. The antimicrobial activity of the magnetic pQAC-Fe 3O 4 nanoparticles which exhibited a response to an external magnetic field could retain 95% biocidal efficiency against E. coli after 10 cycles of repeated test. With the difference of two kinds of pQAC-Fe 3O 4, high antibacterial efficiency was attributed to not only the quaternary group density but also the substituent chain of the quaternary group.