Graphene oxide hydrogen bonding liquid crystals using carboxylic acids as proton donors: Liquid-crystalline behavior and ferroelectric property

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-03-21 DOI:10.1016/j.molstruc.2025.142134

Yi Diao, Xiaolong Chang, Fan Liu, Keyi Wang, Mingda Li, Fanbao Meng

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Abstract

A series of cholesterol-based graphene oxide liquid crystals (GOLCs) were synthesized in a hydrogen bond self-assembly process by use of graphene oxide, a chiral liquid crystal cholesteryl piperidine-2-carboxylate and a crosslinking liquid crystal [1,1′-biphenyl]-4,4′-diyl bis(6-methoxynicotinate). The chemical structure, liquid-crystalline behavior and ferroelectric property of the GOLCs were investigated by various scientific instruments and methods, and the effects of different liquid crystal constituent content on the liquid-crystalline behavior and ferroelectric property were investigated. All the GOLCs showed chiral smectic C phase. The temperature of melting point and mesophase-isotropic phase transition increased with the decrease of chiral liquid crystal content and the increase of crosslinking liquid crystal content for these GOLCs. With the increasing concentration of chiral liquid crystal compounds in the GOLCs, the ferroelectric parameters including saturation polarization and remanent polarization initially exhibited an upward trend before subsequently declining. This phenomenon can be attributed to the varied chiral, rigid, and polar characteristics of the different liquid crystal compounds. These GOLCs demonstrated the highest saturation polarization and remanent polarization values reaching 0.6 and 0.3 μC/cm², respectively, which indicates superior ferroelectric performance.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.