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A flat, freely suspended film of smectic-A liquid crystal supports a pressure difference, {Δ}p, across its two free surfaces. The size of its meniscus is about 10 {μ}m, 2 orders of magnitude smaller than the capillary length, and its profile is predicted to be circular, in accordance with our measurement. The measurement of its radius of curvature gives {Δ}p. We nucleate ex nihilo an elementary edge dislocation loop, and from its critical radius and growth dynamics (governed by {Δ}p), we find the line tension (~8×10^-7dyn) and the mobility of an elementary edge dislocation (~4×10^-7cm²s/g).
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Géminard et al. (1997) studied this question.
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