Phys. Rev. Lett. 79, 4862–4865 (1997)Direct Measurement of Colloidal Forces in an Anisotropic SolventReceived 26 August 1997; published in the issue dated 15 December 1997 We present a new method to measure attractive interactions between colloidal particles, and determine the nature of the attraction between particles suspended in a nematic liquid crystal. We confine droplets filled with ferrofluid to a thin layer and apply a magnetic field to induce dipole moments that drive the droplets apart. When the field is removed, the attractive interactions pull the droplets back together. The force is determined from the velocity because the motion is viscously damped. We confirm the dipolar character of the interaction between droplets in a nematic solvent. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.4862
DOI:
10.1103/PhysRevLett.79.4862
PACS:
82.70.Dd, 61.30.Jf
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