Preparation and Characterization of Poly(acrylic acid-co- 2-hydroxyethyl acrylate)/Fe3O4 Magnetic Fluid

Poly(acrylic acid-co-2-hydroxyethyl acrylate)/Fe_3O_4 magnetic fluid was prepared by modifying nanometer Fe_3O_4 particles with poly(acrylic acidco-2-hydroxyethyl acrylate) P(AA-co-HEA).The copolymer was characterized by gel permeation chromatograph(GPC),nuclear magnetic resonance spectrometry(NMR),and the P(AA-co-HEA)/Fe_3O_4 composite was characterized by transmission electron microscope(TEM),fourier transform infrared spectroscope(FT-IR),ultravioletvisible(UV-Vis)(absorption) spectroscopy and super conducting quantum interference device(SQUID) magnetometer.The(results) show that the modified can be dispersed stably in ethanol for long period and have rapid magnetic(response) against external field.P(AA-co-HEA) adsorbed onto the surface of nano-Fe_3O_4 by coordinate bond.The diameter of the modified magnetic particles is about 10 nm and the material exhibit super paramagnetic properties above the blocking temperature.