Preparation and Property Research of Perfluoropolyether Oil-Based Ferrofluid
- Tsinghua University, State Key Laboratory of Tribology, Department of Mechanical Engineering (China)
In this study, perfluoropolyether oil-based ferrofluid was prepared to satisfy special demands in applications which are too harsh to conventional ferrofluids. Fe{sub 3}O{sub 4} magnetic nanoparticles were synthesized by co-precipitation and modified by perfluoropolyether carboxylic acid surfactant in the atmosphere without protective gas. Perfluoropolyether oil-based ferrofluid was prepared with modified nanoparticles and perfluoropolyether by high-energy ball milling. Properties of ferrofluid fabricated were verified through a series of experiments. Ferrofluid stability was tested by interval point-density method; the average density change is merely 0.0077 g/ml, and change rate is 0.37% after 500 days. Saturation magnetization is 582.46 Gs, much larger than the other four ferrofluids. The average volatility rate is 7.4985*10{sup − 5} g/h/cm{sup 2} at 80 °C after 260 h. Viscosity increases to 1825.7 mPa⋅ s under − 20 °C and still have mobility at − 40 °C. The ferrofluid can resist air blast for 8 h under 200 °C without oxidation or decomposition. Perfluoropolyether oil-based ferrofluid cannot be damaged by water or organic solvents. In addition, the ferrofluid can survive in pH = 1 acid or pH = 14 alkali at least 279 days without corrosion.
- OSTI ID:
- 22773671
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 11 Vol. 31; ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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