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Hydrogen-bonded LC nanocomposites: characterisation of nanoparticle-LC interactions by solid-state NMR and FTIR spectroscopies

Although the molecular-level nanoparticle-liquid crystal (NP-LC) interactions are key for forming stable NP dispersions in LC, characterisation of these interactions is scarce in the literature. Recently, we have developed hydrogen-bonded LC nanocomposites based on mesogenic carboxylic acids and NPs...

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Bibliographic Details
Published in:Liquid crystals 2019-05, Vol.46 (7), p.1067-1078
Main Authors: Roohnikan, Mahdi, Cummings Premack, Kayla, Guzman-Juarez, Brenda, Toader, Violeta, Rey, Alejandro, Reven, Linda
Format: Article
Language:English
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Summary:Although the molecular-level nanoparticle-liquid crystal (NP-LC) interactions are key for forming stable NP dispersions in LC, characterisation of these interactions is scarce in the literature. Recently, we have developed hydrogen-bonded LC nanocomposites based on mesogenic carboxylic acids and NPs functionalised with hydrogen-bond acceptor/donor groups. Here, we apply solid-state 1 H and 13 C NMR and Fourier transform infrared spectroscopies to model systems consisting of mixtures of trans-4-n-butylcyclohexanecarboxylic acid (4-BCHA), 4-hexylbenzoic acid (6BA) and 4,4ʹ-bipyridine. The binary mixture, 4-BCHA:6BA, was also studied. The results were compared to monolayer quantities of 6BA and 4-BCHA adsorbed on pyridine functionalised zirconia NPs (ZrO 2 -n 3 -pyridine) to understand the different effects of the functionalised NPs on the LC properties.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2018.1555723