Submerged Arc Nanoparticles Synthesis System(SANSS) Prepared Suspension of Magnetic Nanoparticles and Analyzed Nanofluids Properties

• Main Authors: HUNG TING SU, 蘇宏庭
• Other Authors: TSING TSHIH TSUNG
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/12282642026283095359

碩士 === 國立臺北科技大學 === 製造科技研究所 === 92 === This study investigates the manufacture technique of magnetic nanoparticles. Pure Nickel is used to produce Ni nanoparticles in liquid to from ferrofluids. Discovery of the experiment, the smaller nanoparticles manufacturing parameters includes, vacuity pressure 30 Torr in the chamber. Power source current and voltage are 13.5 A and 220 V, respectively. The plus duration is 12 μs, and the temperature of dielectric liquid is 0 ℃. The average size of the obtained Ni nanoparticles is 20 nm. Experimental results that show the morphology of nanoparticles are similar sphere ball. There are Ni and NiO components nanoparticles including in ferrofluids. In aspect of Zeta potential, the pH value of isoelectric point (ISP) of the produced ferrofluids is pH 3.0. When the pH value of the ferrofluids is altered, the ferrofluids property will be changed. It will be dispersed when the potential value of the ferrofluids is distant from ISP, or it will be aggregated when the potential value is near ISP. Ferrofluids add the PVP-K30 surfactant to improve nanoparticles suspension and dispersion, because nanoparticles and molecule of fluid will depend on each other well. Ferrofluids is non-NewTon fluid. The viscosity of ferrofluids is large than initial fluid. When the nanoparticles size is smaller, it will similar Newton fluid. In aspect of magnetism property, the result show that the nanoparticles are lack of residual magnetization and coercive force. The produce Ni nanoparticles is similar superparamagnetism. A phenomenon that the nanopaticles will move to magnetic field, if the magnetic field is removed, Ni nanoparticles will stability and suspension in fluid.