Magnetic Field-Induced Phase Transitions in Ferrofluid Emulsion

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Abstract
Two field-induced phase transition regimes are found in a ferrofluid emulsion system, which are defined by three critical fields, Hc1C2c3. The first regime, which starts at Hc1 and finishes at Hc2, is the transition from a gas to induced Nematic liquid crystal phase. In the second regime, or Hc2c3, induced Nematic liquid crystal transits to columnar solid structure. A phase diagram is drawn and is explained well by a scaling calculation, which gives Hc1~Φ−1/2, Hc2~Φ−1/4, and Hc3~Φγ exp (πG/Φγ/2), where Φ is the volume fraction, γ=0.172 and G=1.44.

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