Improved Dispersion Stability of Water-Based TiO2 Nanofluids Through Combined Effects of Nanoparticle Mixing and Dispersant Addition
This study investigated the dispersion stability of aqueous TiO2 nanofluids. The dispersion stability of binary nanofluids containing different concentrations of TiO2 nanoplatelets (TiNP) and TiO2 nanospheres (TiNS), either with or without dispersant sodium dodecyl sulfate (SDS), was evaluated by sedimentation observations and measurements of the Turbiscan stability index (TSI) values. The results revealed that the mixing of TiNS and TiNP nanofluids remarkably improved the dispersion stability than those of the individual TiO2 nanoplatelets and nanospheres. Additionally, the binary nanofluids exhibited good dispersion stability up to 70% percentage of TiNP, after which the sedimentation increased. Moreover, the maximum total concentration of 0.8 wt.% TiO2 binary nanofluids exhibited greater dispersion stability than those of the individual nanoparticles, but further increase to 0.9 wt.% resulted in the loss of dispersion stability. Furthermore, the addition of dispersant SDS further improved the dispersion stability of the TiO2 nanofluids in case of the individual nanoparticles as well as that of binary nanofluids and retained good dispersion stability for increase in the maximum nanoparticle concentration from 0.9 to 4.0 wt.% of the TiO2 nanofluids. The improved dispersion stability of TiO2 nanofluids after combination with each other as well as with SDS offer potential applications for development of novel heat transport media and engineering research.
危险品化学品经营许可证（带存储）