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Viscoelasticity of mono- and polydisperse inverse ferrofluids
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Image of FIG. 1.
FIG. 1.

Micrographs of the polystyrene particles.

Image of FIG. 2.
FIG. 2.

Size distribution of the polystyrene particles.

Image of FIG. 3.
FIG. 3.

Magnetization curve of the ferrofluid APG 512A denoted by open circles. The solid line is a fit of Eq. (11) to these data, utilizing a domain magnetization of . The inset displays the parameters and the size distribution of the magnetic particles obtained from this fit.

Image of FIG. 4.
FIG. 4.

Structures forming in inverse ferrofluids with of nonmagnetic particles obtained with a long distance microscope. The magnetic field strength was applied. The field of view is .

Image of FIG. 5.
FIG. 5.

Magnetosweep curves showing the storage modulus (◻) and the loss modulus (●) of the inverse ferrofluids as a function of magnetic field strength for different volume fraction and particle mean diameter of the nonmagnetic particles.

Image of FIG. 6.
FIG. 6.

Storage modulus scaled according to Eq. (12) for inverse ferrofluids containing polystyrene monodisperse particles with (엯) and (▴), and polydisperse (∎) ones. The diagonal line represents the theory.


Generic image for table
Table I.

Average volume weighted diameter D and normalized polydispersity I of polystyrene particles used in inverse ferrofluids.

Generic image for table
Table II.

The magnetic field strength calculated for all the samples used in this paper. For polydisperse particles we indicate the according to the mean diameter in brackets for comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Viscoelasticity of mono- and polydisperse inverse ferrofluids