Langmuir, Vol.14, No.25, 7140-7146, 1998
Temperature dependence of morphology and magnetic properties of cobalt nanoparticles prepared by an inverse micelle technique
We have fabricated cobalt nanoparticles using sodium borohydride reduction of cobalt chloride in a didodecyldimethylammonium bromide (DDAB)/toluene inverse micelle solution. The particle morphology changed from single particles to clusters as we increased the reaction temperature. Intracluster dipole-dipole interaction increased the blocking temperature and reduced the effective magnetic moment per cluster.