42. Viswanathan, Raghu; Gupta, Ram B. Production of Zinc Oxide Nanoparticles in Supercritical Water, Journal of Supercritical Fluids, 2003, 27, 187-193.
Supercrit. water provides an excellent reaction medium for hydrothermal synthesis of metal oxide nanoparticles. In this work, zinc oxide nanoparticles were produced by oxidn. of zinc acetate in supercrit. water in a continuous tubular reactor. Less than 1 min is enough for the reaction to occur, and the temps. are much lower than in the flame combustion or zinc evapn. processes. Effect of flow rates and feed concns. are studied. Based on TEM and dynamic light scattering analyses, spherical zinc oxide particles were obtained in the range 39-320 nm.