2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134994We report the temperature and field dependence of dc magnetization on sol-gel prepared nanoparticles of Ni(OH)_2. At higher temperature the system is found to behave as a paramagnet while we find evidence for superparamagnetic blocking at low temperature. The system shows a paramagnet-superparamagnet transition and we discuss the underlying mechanism.4 pages, 7 figures, a floating reference removedMesoscale and Nanoscale Physicstext