Energetic stability of loop defects in nematic liquid crystal is analyzed using Mori-Nakanishi ansatz and Frank-Oseen theory with non-zero K 24 divergence term. The ratio of the bulk and divergence elastic constants defines a characteristic material length, which is the equilibrium radius a* of the disclination ring. Positive K 24 forces the ring to shrink.
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Lavrentovich et al. (1997) studied this question.
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