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Issue 7, 2007
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Columnar phase structures of an organic–inorganic hybrid functionalized with eight calamitic mesogens

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Abstract

A liquid-crystalline octapode, formed by laterally connecting calamitic mesogens to an inorganic silsesquioxane cube through flexible siloxane spacers, is studied using polarized light microscopy, differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The studies are extended to mixtures of the octapode with the respective monomer mesogens. The monomer and the octapode show a nematic phase. At lower temperatures, the octapode exhibits additionally a columnar hexagonal phase (p6mm lattice), which, on further cooling, undergoes a transition to a columnar rectangular phase (p2gg lattice). A similar phase-transition sequence is observed for mixtures of the octapode with moderate concentrations of the monomer. The columnar–columnar transition is discussed combining XRD and DSC results, and a possible model of the molecular self-organization is presented.

Graphical abstract: Columnar phase structures of an organic–inorganic hybrid functionalized with eight calamitic mesogens

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Publication details

The article was received on 05 Dec 2006, accepted on 21 Mar 2007 and first published on 17 Apr 2007


Article type: Paper
DOI: 10.1039/B617696H
Citation: Soft Matter, 2007,3, 857-865
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    Columnar phase structures of an organic–inorganic hybrid functionalized with eight calamitic mesogens

    P. K. Karahaliou, P. H. J. Kouwer, T. Meyer, G. H. Mehl and D. J. Photinos, Soft Matter, 2007, 3, 857
    DOI: 10.1039/B617696H

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