Abstract
Many complex fluids are only available in tiny quantities or used in confined regions. The task of measuring their rheological properties is then a challenge. Here we present a method showing how the viscosity of very small volumes of ferrofluid may be measured using immersed nonmagnetic spherical microparticles. In the suspension these act as magnetic holes in the ferrofluid which may be manipulated by external magnetic fields. When the effects of nearby walls as well as other spheres are taken into account, the results are consistent with viscosity values reported from standard bulk measurement techniques.
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