Surface diffusion of matter in discotic liquid crystal threads

Daoud, M.; Gharbia, M.; Gharbi, A.; Destrade, C.

doi:10.1016/0039-6028(96)00041-6

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“…In previous papers [ 1,2] we have demonstrated that an optical method, based on the detection of the transmitted light through the material. is well-suited to measure diffusion coefficients in columnar discotic liquid crystals.…”

Section: Introductionmentioning

confidence: 99%

Characterization by mirage effect technique of dye diffusion in columnar discotic liquid crystals

Daoud¹,

Louis²,

Quélin³

et al. 1995

Liquid Crystals

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The anisotropic behaviour of the matter diffusion in columnar discotic liquid crystals is studied by the 'mirage effect' technique. The Dh and Do mesophases of C&ET and C1 IHET, respectively, are considered. The impurity (a dye, the l-[4-(xylylazo)xylylazo]-2-naphthol) diffusing in these mesophases is detected by the photothermal deflection technique. Measurements of the diffusion coefficients are performed in two perpendicular directions, along and perpendicularly to the molecular columns. Effects of impurity size, length and type of the branched chains on the discs of triphenylene, and molecule stackings in columns, are presented.

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Section: Introductionmentioning

confidence: 99%