title: [Preparation and characterization of a polyvinylpyrrolidone water-based magnetic fluid].
abstract: OBJECTIVE
  To prepare a stable water-based magnetic fluid.
  
  
  METHODS
  A water-based magnetic fluid was prepared by addition of polyvinylpyrrolidone (PVP) as the coating agent for the magnetic particles. After preparation of Fe3O4 by co-precipitation method, PVP was added for its coating, followed by ultrasonic agitation and purification.
  
  
  RESULTS
  The magnetic nanoparticles of homogeneously small size and water-based magnetic fluid were obtained, which had good dispersion in water with strong magnetism.
  
  
  CONCLUSIONS
  PVP can be used as a surfactant to stabilize the magnetic fluid.
authors: Institute of Biomedical Engineering, Central South University, Changsha 410008, China.
authors: Jian-feng
authors: JF
authors: Xie
authors: Yang-de
authors: YD
authors: Zhang
authors: Zhao-wu
authors: ZW
authors: Zeng
authors: Xiao-li
authors: XL
authors: Wang
authors: Xing-yan
authors: XY
authors: Liu
authors: Wei-hua
authors: WH
authors: Zhou
mesh_terms: D005296:Ferrous Compounds / Q000737:chemistry; D008280:Magnetics; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D005296:Ferrous Compounds; D013501:Surface-Active Agents; D011205:Povidone; C029451:ferrous chloride