Preparation of low-cost magnetic nitrocellulose microbeads

Tanyolac D., Ozdural A.

REACTIVE & FUNCTIONAL POLYMERS, cilt.45, ss.235-242, 2000 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 45 Konu: 3
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1016/s1381-5148(00)00037-7
  • Sayfa Sayıları: ss.235-242


In this work, new magnetic particles were prepared in uniform and spherical form for the range 125 mu m < D-p < 250 mu m from nitrocellulose and magnetite through a modified solvent evaporation technique. The most appropriate solvent, dispersion medium, stabilization and surface active agents and stirring rate were determined as acetone and 1,2-dichloroethane mixture, glycerol, SDS and pluronic F68 together with PVA and 700 rev./min, respectively. The magnet abundant in nature, magnetite (D-p < 40 mu m), was successfully embedded in the particle structure during polymerization by an elaborated technique. Fine spherical particles with high magnetic quality (similar to 4.8 emu/g microbead at 6 kG magnetic field intensity) were produced for magnetically fluidized bed or magnetic filtration applications. Hydroxyl groups on the particle surface were activated with glutaraldehyde for the immobilization of a saccarifying enzyme, glucoamylase. (C) 2000 Elsevier Science B.V. All rights reserved.