6BT液晶薄膜的分子动力学

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-09-20 DOI:10.1016/j.molliq.2025.128573

Anna Drzewicz , Michał Krupiński , Oleksandr Tomchuk , Ewa Pięta , Gabriela Lewińska , Ewa Juszyńska-Gałązka

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引用次数: 0

摘要

设备的持续小型化推动了对超薄液晶薄膜及其独特性能的科学好奇心的激增。在本研究中，我们首次成功地利用有机分子束沉积（OMBD）方法在室温下制备了4-己基-4′-异硫氰酸酯联苯（6BT）液晶超薄膜。通过结合椭偏仪和x射线反射仪，我们精确地表征了纳米分辨率的薄膜厚度。傅里叶变换红外光谱（FTIR）揭示了一种迷人的厚度依赖分子排序：芳香和烷基段在最小厚度上的初始自组装，随后随着薄膜变厚异硫氰酸酯（NCS）基团的明显排列。在宽带介电光谱的补充下，我们的工作揭示了详细的振动和弛豫动力学，揭示了超薄几何形状中出现的块状行为。这一突破为在下一代纳米级器件中调整液晶功能提供了新的途径。

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Molecular dynamics in thin films of 6BT liquid crystal

The continued miniaturization of devices is driving a surge of scientific curiosity toward ultrathin liquid crystal films and their unique properties. In this study, we demonstrate for the first time the successful formation of ultra-thin films of 4-hexyl-4′-isothiocyanatobiphenyl (6BT) liquid crystal by the organic molecular beam deposition (OMBD) method at room temperature. By combining ellipsometry and X-ray reflectometry, we precisely characterize film thickness with nanometer resolution. Fourier-transform infrared spectroscopy (FTIR) unveils a fascinating thickness-dependent molecular ordering: initial self-assembly of aromatic and alkyl segments at minimal thicknesses, followed by a pronounced alignment of isothiocyanate (NCS) groups as films grow thicker. Complemented by broadband dielectric spectroscopy, our work reveals detailed vibrational and relaxation dynamics, shedding light on how bulk-like behaviours emerge in ultrathin geometries. This breakthrough offers new pathways for tuning liquid crystal functionalities in next-generation nanoscale devices.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.