Influence of the pH on the ZnO nanoparticle growth in supercritical water: Experimental and simulation approaches |
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| Affiliation: | 1. Yuzuncu Yil University, Faculty of Education, Department of Chemistry, Zeve Campus, 65080, Van, Turkey;1. Institute of Process Machinery and Systems Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 4, 91052 Erlangen, Germany;2. Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander Universitaet Erlangen-Nuernberg, Paul-Gordan-Straße 6, 91052 Erlangen, Germany;1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM, Bangi 43600, Selangor, Malaysia |
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| Abstract: | In order to improve the knowledge on the nucleation and the growth mechanisms of metal oxides nanoparticles produced in supercritical water domain, ZnO was used as a “model” material. A continuous process of hydrothermal synthesis was employed to synthesize ZnO nanopowders (T = 410 °C and P = 305 bar) from Zn(NO3)2 and KOH solutions with different values of KOH]/Zn(II)] ratio from 0 to 8 in order to investigate the pH effect on the growth of ZnO nanocrystallite in terms of size and morphology. The samples were characterized by X-Ray Diffraction and Transmission Electronic Microscopy. ZnO crystal was considered as a cylindrical crystallite with a diameter D and height H. Especially, the aspect ratio D/H was already used to observe the change of ZnO nanoparticle shape correlated with TEM observations and results from a CFD simulation model. A schematic synoptic of the ZnO growth in supercritical domain is also presented. |
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| Keywords: | Supercritical water ZnO nanopowders pH effect Aspect ratio CFD simulations Growth mechanism |
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