Surface Modification Approach to TiO2 Nanofluids with High Particle Concentration, Low Viscosity, and Electrochemical Activity

ACS Applied Materials & Interfaces
Sujat SenElena V Timofeeva

Abstract

This study presents a new approach to the formulation of functional nanofluids with high solid loading and low viscosity while retaining the surface activity of nanoparticles, in particular, their electrochemical response. The proposed methodology can be applied to a variety of functional nanomaterials and enables exploration of nanofluids as a medium for industrial applications beyond heat transfer fluids, taking advantage of both liquid behavior and functionality of dispersed nanoparticles. The highest particle concentration achievable with pristine 25 nm titania (TiO2) nanoparticles in aqueous electrolytes (pH 11) is 20 wt %, which is limited by particle aggregation and high viscosity. We have developed a scalable one-step surface modification procedure for functionalizing those TiO2 nanoparticles with a monolayer coverage of propyl sulfonate groups, which provides steric and charge-based separation of particles in suspension. Stable nanofluids with TiO2 loadings up to 50 wt % and low viscosity are successfully prepared from surface-modified TiO2 nanoparticles in the same electrolytes. Viscosity and thermal conductivity of the resulting nanofluids are evaluated and compared to nanofluids prepared from pristine nanoparticles....Continue Reading

References

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Dec 4, 2010·Journal of Nanoscience and Nanotechnology·Wenhua YuJules L Routbort
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Sep 6, 2011·Journal of Colloid and Interface Science·Elena V TimofeevaDileep Singh
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Sep 10, 2010·Science and Technology of Advanced Materials·Hidehiro Kamiya, Motoyuki Iijima

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Citations

May 26, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Junhong ChenKuo-Chih Chou
Jun 18, 2017·Nanoscale Research Letters·Liu Yang, Yuhan Hu
Apr 9, 2017·Scientific Reports·Hye Jung LeeYoung Seok Song
Mar 9, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Bernard P Binks, Hui Shi

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