Ms. Dababneh et al., VISCOSITY, RESISTIVITY AND SURFACE-TENSION MEASUREMENTS OF FE3O4 FERROFLUID, Journal of magnetism and magnetic materials, 125(1-2), 1993, pp. 34-38
The viscosity eta of Fe3O4 ferrofluid at volume concentrations in the
range epsilon = 0.0-0.013 are measured. The corresponding range of val
ues of eta is 1.6-1.8 cp. A linear relationship exists between the rel
ative viscosity and the concentration of the fluid. Measurements of re
lative resistivity of Fe3O4 ferrofluid at various concentrations (epsi
lon = 0.00526-0.0526) are also reported. The relative resistivity is t
aken with respect to the resistivity of the highest value of concentra
tion available (epsilon = 0.0526) which is 2.05 X 10(6) OMEGA-m. The r
esults 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 Fe3O4 ferrofluid show a continuous increase with increasin
g concentration and have values ranging from 25.0 to 26.63 dyn/cm in t
he concentration range epsilon = 0.0-0.0526.