Abstract
We demonstrate an increase in the interparticle distance of a colloidal dipolar chain in a nematic liquid crystal (NLC). Applying an in-plane electric field perpendicular to the rubbing direction induces a splay-bend wall defect in the middle of the electrode gap, which traps a dipolar chain. Above the Freedericksz threshold electric field, the interparticle distance increases with increasing applied electric field, owing to the reorientation of the NLC molecules. The maximum increase is 32% of the particle diameter.
Highlights
Defects in nematic liquid crystals (NLCs), which are an inevitable consequence of broken continuous symmetry in NLC director fields, are continuing to attract interest in condensed matter physics[1] and in testing the cosmological mechanism.[2]
In conclusion, we observed an increase in the interparticle distance of a colloidal dipolar chain
By applying an in-plane electric field, a splay-bend wall was formed between the electrodes and its mechanism was described in this paper
Summary
Defects in nematic liquid crystals (NLCs), which are an inevitable consequence of broken continuous symmetry in NLC director fields, are continuing to attract interest in condensed matter physics[1] and in testing the cosmological mechanism.[2]. Such discontinuities can occur as an effect of surfaces[5] or as a necessary element of an equilibrium state.[6] On the other hand, wall structures can exist under an electric or magnetic field Under such an external field, NLC molecules align with the director parallel or antiparallel to the field, and both situations are physically equivalent. The director is not discontinuous but undergoes a continuous rotation through such a wall
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