Experimental Investigation of Rheological Properties and Thermal Conductivity of SiO<sub>2</sub>–TiO<sub>2</sub> Composite Nanofluids Prepared by Atomic Layer Deposition
Zalán István Várady,
Thong Le Ba,
Bence Parditka,
Zoltán Erdélyi,
Klara Hernadi,
Gábor Karacs,
Gyula Gróf,
Imre Miklós Szilágyi
Affiliations
Zalán István Várady
Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Muegyetem rakpart 3, 1111 Budapest, Hungary
Thong Le Ba
Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Muegyetem rakpart 3, 1111 Budapest, Hungary
Bence Parditka
Department of Solid-State Physics, Faculty of Science and Technology, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary
Zoltán Erdélyi
Department of Solid-State Physics, Faculty of Science and Technology, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary
Klara Hernadi
Institute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
Gábor Karacs
ELKH-ME Materials Science Research Group, ELKH, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
Gyula Gróf
Centre of Energy Research, Konkoly-Thege Miklós út 29-33, 1121 Budapest, Hungary
Imre Miklós Szilágyi
Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Muegyetem rakpart 3, 1111 Budapest, Hungary
In the current research, surface-modified SiO2 nanoparticles were used upon immersion in an applied base fluid (ethylene glycol:water = 1:1). The atomic layer deposition method (ALD) was introduced to obtain a thin layer of TiO2 to cover the surface of SiO2 particles. After the ALD modification, the TiO2 content was monitored by energy dispersive X-ray spectroscopy (EDS). Transmission electron microscopy (TEM) and FT-IR spectroscopy were applied for the particle characterization. The nanofluids contained 0.5, 1.0, and 1.5 volume% solid particles and zeta potential measurements were examined in terms of colloid stability. A rotation viscosimeter and thermal conductivity analyzer were used to study the nanofluids’ rheological properties and thermal conductivity. These two parameters were investigated in the temperature range of 20 °C and 60 °C. Based on the results, the thin TiO2 coating significant impacted these parameters.
