Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (05): 1267-1272.doi: 10.3866/PKU.WHXB20110429


Magnetic Polyacrylamide/Fe3O4 Nanocomposite Hydrogel with High Mechanical Strength

XIANG Mei, HE Chang-Cheng, WANG Hui-Liang   

  1. College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
  • Received:2010-10-20 Revised:2011-01-03 Published:2011-04-28
  • Contact: HE Chang-Cheng
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50673013) and Beijing Municipal Commission of Education,China.


Polyacrylamide (PAAm) hydrogels with very high mechanical strength were prepared using radiation-peroxidized micelles that were formed by surfactant molecules as initiating and crosslinking centers. PAAm/Fe3O4 nanocomposite hydrogels were obtained by introducing Fe3O4 nanoparticles into PAAm hydrogels through an in situ chemical co-precipitation method. Scanning electron microscopy (SEM) investigations showed that the nanoparticles were homogeneously distributed and the particles were about 30 nm in size. X-ray diffraction (XRD) analysis showed that the obtained nanoparticles were spinel Fe3O4. The PAAm/Fe3O4 nanocomposite hydrogels showed superparamagnetism. The ferrogels also had good mechanical properties, the elongation at break of some gels could be as high as 1200% and the maximum tensile strength was about 0.10 MPa, and they exhibited very good shape recoverability.

Key words: Hydrogel, Fe3O4, Magnetism, Mechanical strength