Hydrothermal synthesis of zinc oxide (ZnO) nanoparticles and nanorods from zinc nitrate (Zn(NO_3)_2) and potassium hydroxide (KOH) solutions was carried out with a flow-through apparatus for continuous production and rapid heating of the starting solution to supercritical states. Effect of Zn(NO_3)_2 and KOH concentrations and flow rates on the particle size and morphology was examined at 673 K and 30 MPa. Nanoparticles having an average particle diameter of 22 nm was produced from 1.0×10~(-3) Zn(NO_3)_2 and 4.0×10~(-3) KOH aqueous solution at a total flow rate of 22.5g/min. Increasing the flow rate to 1.5 times larger value, nanorods having an average rod width of ca. 40 nm was produced.
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