Viscosity, resistivity and surface tension measurements of Fe,O, ferrofluid
نویسندگان
چکیده
The viscosity n of Fe,O, ferrofluid at volume concentrations in the range t = 0.0-0.013 are measured. The corresponding range of values of q is 1.6-1.8 cp. A linear relationship exists between the relative viscosity and the concentration of the fluid. Measurements of relative resistivity of Fe,O, ferrofluid at various concentrations (E = 0.00526-0.0526) are also reported. The relative resistivity is taken with respect to the resistivity of the highest value of concentration available (e = 0.0526) which is 2.05~ 10h R-m. The results show that the relative resistivity is inversely proportional to the concentration of the fluid. The variation of the resistivity with applied magnetic field is also presented. Measurements of the surface tension of Fe,O, ferrofluid show a continuous increase with increasing concentration and have values ranging from 25.0 to 26.63 dyn/cm in the concentration range E = 0.0-0.0.526.
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