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Small angle neutron and x-ray scattering methods are used to investigate thestructure of dilute suspensions of two different ferrofluid systems dispersedin soft polyacrylamide hydrogels. It is found that the particles in the fluidare fractal aggregates composed of smaller particles of radius ca. 5 nm. Thefractal dimension is strongly dependent on sample, taking the value 1.7 in thefirst sample and 2.9 in the second sample. In the presence of a magnetic fieldthe aggregates orient, but are restricted in both their translational androtational freedom. The effect of the gel elasticity is treated as a hindranceto the orientation process.

Scattering from dilute ferrofluid suspensions in soft polymer gels