Papers by Author: Shih Chieh Lin

Abstract: In this study, the author uses the self-developed submerged arc nanofluid synthesis system to fabricate TiO2 nanofluids. This system uses the energy produced by arc discharge to melt and vaporize matallic polarities under a vacuum condition. The vaporized metal is cooled rapidly inside a low-temperature dielectric liquid, forming nanoparticles that are evenly distributed inside the dielectic liquid. Experiment proves that the roundness of the fabricated TiO2nanoparticles are much better than those fabricated by aerosol methods. Also, the fabricated nanofluid carries a high suspension stability. We uses X-ray absorption spectroscopy to analyze their electronic structure of TiO2 nanofluid. Besides, by measuring the Zeta potential of TiO2 nanofluid having different pH values, it investigates into the suspension stability of the TiO2nanofluid. In order to verify the applicability of the TiO2nanofluid, this study also analyzes and compares the rheology properties of the nanofluid having different average particle sizes as well as their reaction towards light absorption.

Abstract: In this study, the author uses a novel nanofluid synthesis system to fabricate a TiO2 nanofluid. The improvement of the proposed nanofluid synthesis system focuses mainly on the pressure control system, coolant circulation system, parameter control system and the machine dimension of the original submerged arc nanofluid synthesis system. This helps to achieve an experimental machine with a fabrication condition to produce more stable and finer TiO2 nanofluids with a particle size of good reproducibility. Experiment is proceeded towards 15 sets of TiO2 nanofluid fabricated by the proposed system are tested under the experimental conditions of 250 V, 6 A of peak current, 2μs of discharge pause off time and 15 days of settling time. The experimental results show that the average Zeta potential of TiO2 nanofluids are -54.2 mv, and the difference between the data and the average value of each set is less than 7%. Furthermore, the average particle size is 45.3nm, and the difference between the data and the average value of each set is less than 6%. The fabricated TiO2 particles have an Anatase structure, and in the aspect of roundness measurement, the produced TiO2 has a good roundness of 0.3 nm. Experiment proves that the roundness of the fabricated TiO2 nanoparticles are much better than those fabricated by aerosol methods. Also, the fabricated nanofluid has a high suspension stability.