A Novel Synthesis Process of ZnO Nano Powders in Granule Form

Abstract

ZnO nano powders, which have different morphologies and agglomerate structures, were continuously produced from Zn(NO 3 ) 2 .6H 2 O, NH 3 and NaOH by a novel synthesis process: modification and combination of precipitation method with spray dryer. The synthesized powders were characterized by different methods such as SEM, TEM, DTA-TG, XRD, BET and Nanosizer. They represent a spherical granule form with a considerably high specific surface area of 39-41 m 2 .g -1 and nano particle size 50-550 nm, 5-300 nm and 26-39 nm according to Nanosizer, TEM and BET, respectively.

Recent Advances in ZnO Nanomaterial-Mediated Biological Applications and Action Mechanisms

“…To date, a wide variety of ZnO nanoparticle preparation methods have been put forward, from physicochemical synthesis to green biogenic synthesis. Initially, physicochemical synthesis was the common preparation means, which mainly includes the methods of precipitation [16][17][18][19][20][21], electrochemical deposition [22][23][24], hydrothermal synthesis [25][26][27][28][29][30][31][32], sol-gel process [33,34], solid state reaction [35,36], chemical vapor synthesis [37], gel combustion [38], microemulsion [39], solvothermal synthesis [40][41][42], spray pyrolysis [43], sputtering [44][45][46], sonication [47,48], microwave [49], thermal evaporation [50][51][52] and so on. Each of these methods has its own advantages.…”

“…The sol-gel way has the superiority of simplicity, repeatability and reliability. Importantly, the products of the sol-gel method exhibit the characteristics of high purity, low particle size and high specific surface area [21,53]. Hydrothermal synthesis is simple and can operate in a controlled manner, which is helpful to tailor the particles' morphology via controlling the reaction rates of hydrolysis and condensation [53].…”