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  • Title: Measurement of elastic forces between iron colloidal particles in a nematic liquid crystal.
    Author: Noël CM, Bossis G, Chaze AM, Giulieri F, Lacis S.
    Journal: Phys Rev Lett; 2006 Jun 02; 96(21):217801. PubMed ID: 16803274.
    Abstract:
    The forces that arise between two iron particles in a nematic liquid crystal with a strong homeotropic anchoring were studied. For the first time, the short range repulsive force resulting from the presence of a hedgehog defect between two particles was precisely determined thanks to application of a small magnetic field and observation of the equilibrium position resulting from the balance between the elastic and magnetic forces. Above a given threshold force, the particles stuck together whereas the hedgehog defect was expelled and transformed into a Saturn ring located between the particles. The attractive part of the interparticle force was determined with the same method on the entire range of separation distances; we found that the equilibrium distance between two particles was r = 1.19 +/- 0.05 <d> (<d> was the average diameter of the pair of particles).
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