Elastic constants and anchoring energies

Measured values of the Frank elastic constants Ku, 1 22. and K33 and their temperature dependence are available in the literature. The common order of magnitude far from Tni is around 10 N. K n and K33 are close (they are equal in the Landau-de Gennes analysis). For the 5CB, K33 1.3/Tii, while K22 0.5/fn. Similar trends 

Considering the surface elasticity, the situation is more complex, as direct measurements are not possible. As previously mentioned, the mere existence of K13 in a continuous description is still a matter of debate. In 5CB, NMR studies suggest that —0.6/fn K24 0.6A ii. 

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