The 4,n-alkyloxybenzoic acid 6OBAC has a very rich variety of crystalline structures and two nematic sub-phases, characterised by different textures. It is a material belonging to a family of liquid crystals formed by hydrogen bonded molecules, the 4,n-alkyloxybenzoic acids (n indicates the homologue number). The homologues with 7 <= n <= 13 display both smectic C and N phases. In spite of the absence of a smectic phase, 6OBAC exhibits two sub-phases with different textures, as it happens in other materials of the homologue series which possess the smectic phase. This is the first material that exhibits a texture transition in a nematic phase directly originating from a crystal phase. Here we present the results of an image processing assisted optical investigation to characterise the textures and the transitions between textures. This processing is necessary to discriminate between crystal modifications and nematic sub-phases.

Texture transitions in the liquid crystalline alkyloxybenzoic acid 6OBAC / Sparavigna, Amelia Carolina; Mello, A; Montrucchio, Bartolomeo. - In: PHASE TRANSITIONS. - ISSN 0141-1594. - 79:(2006), pp. 293-303. [10.1080/01411590600748132]

Texture transitions in the liquid crystalline alkyloxybenzoic acid 6OBAC.

SPARAVIGNA, Amelia Carolina;MONTRUCCHIO, BARTOLOMEO
2006

Abstract

The 4,n-alkyloxybenzoic acid 6OBAC has a very rich variety of crystalline structures and two nematic sub-phases, characterised by different textures. It is a material belonging to a family of liquid crystals formed by hydrogen bonded molecules, the 4,n-alkyloxybenzoic acids (n indicates the homologue number). The homologues with 7 <= n <= 13 display both smectic C and N phases. In spite of the absence of a smectic phase, 6OBAC exhibits two sub-phases with different textures, as it happens in other materials of the homologue series which possess the smectic phase. This is the first material that exhibits a texture transition in a nematic phase directly originating from a crystal phase. Here we present the results of an image processing assisted optical investigation to characterise the textures and the transitions between textures. This processing is necessary to discriminate between crystal modifications and nematic sub-phases.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/1501408
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