Cape Peninsula University of Technology
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Growth kinetics evaluation of hydrothermally synthesised Co2(OH)3Cl nanoparticles for application in solar thermal heat transfer fluids.

posted on 2024-07-02, 09:14 authored by Patricia NtumbaPatricia Ntumba

This research project reports a novel type of nanofluid consisting in the addition of cobalt hydroxychloride (Co2(OH)3Cl) nanopowders to pure water via a two-step method. Co2(OH)3Cl nanoparticles were synthesized via hydrothermal precipitation at varying propanol concentrations ranging from 0% to 100%. Morphological analysis revealed hexagonally shaped Co2(OH)3Cl nanoplates with average sizes ranging from 83.6 nm to 56.1 nm at propanol concentrations below 50%. In contrast, spherical Co2(OH)3Cl nanoparticles, with average sizes ranging from 22.6 nm to 9.6 nm, were formed at propanol concentrations higher than 50%. Thermal conductivity and viscosity analysis of the prepared nanofluids were performed at temperatures ranging from 298 K to 308 K. At 303 K, the nanofluid made of Co2(OH)3Cl nanoplates at ~58 nm displayed an increase in viscosity of ~11%. At 308 K, the nanofluid made of Co2(OH)3Cl nanospheres at ~10 nm exhibited the highest augmentation in thermal conductivity of ~14%. Moreover, the growth of Co2(OH)3Cl in the presence of 70% propanol and water has been studied over time. In water, Co2(OH)3Cl nanoplates grew first via OR kinetics then OA kinetics whereas a simultaneous OR and OA growth kinetics occurred for nanospheres. In 70% propanol, the growth of Co2(OH)3Cl nanospheres was controlled first by OR kinetics, then by OA kinetics. This novel nanofluid holds considerable potential for application as an advanced heat transfer fluid in medium-temperature solar collector systems.


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