Stability Optimization of Modified Oil-based TiO2 Nanofluids
To prepare TiO2/oil nanofluids with high stability,orthogonal experiments were designed to investigate the best solution for modifying TiO2 nanoparticles by controlling three variables:modifier type,modifier amount,and modification temperature.In nine sets of orthogonal experiments,the absorbance results showed that the nanofluids prepared by modifying TiO2 nanoparticles with 2 mL of hexadecyl trimethoxysilane at 50℃had the best stability,and remained stable after 10 weeks at room temperature.The surface contact angle between the TiO2 nanoparticles prepared by this method and deionized water was found to increase from 12.4° to 143.3° by contact angle test,which has excellent hydrophobic and lipophilic properties,facilitating the dispersion of TiO2 nanoparticles in heat transfer oil.In addition,the results of the orthogonal experiments were analyzed,and it was concluded that the optimal modifier dose was 1 mL,the optimal modifier type was hexadecyl trimethoxysilane,and the optimal modification temperature was 50℃.The modifier type had the greatest effect on the nanofluid stabilization results,and the modifier dose had the least effect on the nanofluid stability.
hexadecyl trimethoxysilaneKH550KH570stabilityTiO2 nanofluidssurface chemical modification
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