Field induced phase segregation in ferrofluids


Kooij, E.S. and Galca, A.C. and Poelsema, B. (2008) Field induced phase segregation in ferrofluids. Journal of Colloid and Interface Science, 327 (1). pp. 261-265. ISSN 0021-9797

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Abstract:We study the phase segregation in magnetite ferrofluids under the influence of an external magnetic field. A phase with lower nanoparticle density and corresponding higher optical transmission is formed in the bottom of a glass cell in the presence of only a very modest magnetic field gradient (smaller than 25 T/m). The flux density in our magnetic configuration is simulated using finite element methods. Upon switching off the external magnetic field, the low-density phase develops into a ‘bubble’-like feature. The kinetics of this ‘bubble’ in the absence and presence of a magnetic field are described and analyzed in terms of a simple model, which takes into account buoyancy and drag forces
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Copyright:© 2008 Elsevier Inc
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