Embedded Files
P. Pieranski and B. Jérôme.
"Adsorption-induced anchoring transitions at nematic-liquid-crystal–crystal interfaces."
Physical Review A 40, no. 1 (1989): 317.
J. Bechhoefer, J. L. Duvail, L. Masson, B. Jérôme, R. M. Hornreich, and P. Pieranski.
"Critical behavior in anchoring transitions of nematic liquid crystals."
Physical Review Letters 64, no. 16 (1990): 1911.
P. Pieranski, B. Jérôme and M. Gabay
« Adsorption-induced anchoring transitions »
Mol. Cryst. Liq. Cryst. 179 (1990) 285
see also in: "Chapter B.V. Anchoring and anchoring transitions of nematics on solid surfaces" in "Nematic and cholesteric liquid crystals" by
P. Oswald and P. Pieranski, Taylor&Francis 2005
Structure of cleaved mica muscovite surfaces.
a) Structure of mica muscovite: stack of alternating triplets T1 and T2 made of pairs of Si2O5 sheets intercalated with Al3+ ions. Triplets are intercalated with K+ ions. Two cleavages along K+ planes A and B are possible.
b) Structure of the upper and lower surfaces of the triplet T1. The hexagonal symmetry of the Kagome lattice of oxygen atoms is broken by the shift l1 between the two Si2O5 sheets belonging to the triplet T1.
c) Structure of the upper and lower surfaces of the triplet T2. The hexagonal symmetry of the Kagome lattice of oxygen atoms is also broken by the shift between the two Si2O5 sheets of the triplet T2. However, in this triplet T2 the staggering vector l2 is different: it makes the angle of 120 with l1. For this reason, the planar anchorings on surfaces obtained by cleavages A and B have different orientations. As they are parallel (or orthogonal) to the staggering vectors l1 and l2, they make angles of +120 for the cleavage A and -120 for the cleavage B.
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