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Dielectric anisotropy in liquid crystal mixtures with nematic and smectic phases

Chinese Physics B 2024年第8期33卷 519-524页

作者：汤星舟叶家耀王子烨姜皓译尚小虎杨朝雁李炳祥 Nanjing University of Posts and Telecommunications College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology)Nanjing 210023China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210023China

The modulation of dielectric anisotropy(△ε)is pivotal for elucidating molecular interactions and directing the alignment of liquid *** this study,we combine liquid crystals with opposing dielectric anisotropies to explore the impact of varying concentrations on their *** report the sign-reversal of△εin both the nematic and smectic A phases of these mixed liquid crystals,alongside a dual-frequency behaviour across a broad temperature *** research further quantifies the influence of mixture ratios under various temperatures and electric field *** exploration may pave the way for the discovery of new physical phenomena.

关键词： mixed liquid crystal dielectric anisotropy tunable nematic smectic

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Local high-density distributions of phospholipids induced by the nucleation and growth of smectic liquid crystals at the interface

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Chinese Chemical Letters 2022年第8期33卷 3973-3976页

作者： Chenjing Yang Li Chen Rui Zhang Dong Chen Laura R.Arriaga David A.Weitz College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Zhejiang Key Laboratory of Smart BioMaterials and Center for Bionanoengineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Department of Theoretical Condensed Matter Physics Condensed Matter Physics Center and Instituto Nicolás CabreraUniversidad Autónoma de MadridMadrid 28049Spain John A.Paulson School of Engineering and Applied Sciences and Department of Physics Harvard UniversityCambridgeMA 02138United States Department of Physics The Hong Kong University of Science&TechnologyHong KongChina

Amphiphilic molecules adsorbed at the interface could control the orientation of liquid crystals(LCs)while LCs in turn could influence the distributions of amphiphilic *** studies on the interactions between liquid crystals and amphiphilic molecules at the interface are important for the development of molecular *** this paper,we demonstrate that the development of smectic LC ordering from isotropic at the LC/water interface could induce local high-density distributions of amphiphilic *** of liquid crystals and phospholipids in chloroform are first emulsified in *** fluorescently labeling the phospholipids adsorbed at the interface,their distributions are visualized under fluorescent confocal ***,local high-density distributions of phospholipids showing a high fluorescent intensity are observed on the surface of LC *** on the correlation between phospholipid density,surface tension and smectic LC ordering suggest that when domains of smectic LC layers nucleate and grow from isotropic at the LC/water interface as chloroform slowly evaporates at room temperature,phospholipids transition from liquid-expanded to liquid-condensed phases in response to the smectic ordering,which induces a higher surface tension at the *** results will provide an important insight into the interactions between liquid crystals and amphiphilic molecules at the interface.

关键词： Liquid crystals Phospholipids Droplet Interface smectic

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ELECTROTHERMOOPTIC EFFECT OF smectic A LIQUID CRYSTALS

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Chinese Science Bulletin 1991年第18期36卷 1521-1524页

作者：道诺其木德那波信彦 Department of Physics Inner Mongolia Teachers University Hohhot 010022 PRC Department of Physics Meiei University Hinoshi Tokyo Japan

The elec rooptic effect of a smectic A liquid crystal has been investigated by many authors. When an appropriate electric field is applied to the smectic A liquid crystal, the transparent texture is transformed to the... 详细信息

关键词： smectic A liquid crystal electrothermooptic effect smectic texture layer structure capacitance analysis.

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Dielectric and Spontaneous Polarization Studies of a Ferroelectric Chiral smectic Liquid Crystal

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World Journal of Condensed Matter Physics 2012年第2期2卷 75-79页

作者： Abraham K. George C. Carboni S. H. Al-Harthi W. M. Zoghaib D. M. Potukuchi Department of Chemistry Sultan Qaboos University Muscat Oman Department of Physics Sultan Qaboos University Muscat Oman Department of Physics University College of Engineering Jawaharlal Nehru Technological University Kakinada India

Dielectric relaxation and spontaneous polarization studies have been carried out in a low molar mass organosiloxane liquid crystal, TSi10PPBN4 which displays a wide temperature range of de Vries smectic A* and chiral smectic C* phases. The temperature variation of the permittivity and dielectric loss studied are found to have anomalous variations in the vicinity of the phase transitions. The frequency variation of permittivity and dielectric loss are also studied in the de Vries smectic A* and smectic C* phases. The relaxation frequency, fR is found to decrease with decreasing temperature. Temperature variation of fR is found to follow an Arrhenius shift from which the activation energy is estimated. The thermal variation of the spontaneous polarization, Ps is measured using the polarization reversal technique in the smectic C* phase. Ps increases initially, reaches a peak value and then drops drastically in the vicinity of the SmC*-SmA*de Vries phase transition.

关键词： smectic C* and smectic A*de Vries Phases Dielectric Permittivity Dielectric Relaxation Activation Energy Spontaneous Polarization

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Structure, Photochromism and Liquid Crystal Properties of 1-Alkyl-2-(Arylazo)Imidazoles (Raai-C<sub>n</sub>H<sub>2n+1</sub>, n (Even) = 10 - 22)

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Advances in Materials Physics and Chemistry 2013年第2期3卷 133-145页

作者： Avijit Nandi Chandana Sen Debashis Mallick Randhir K. Sinha Chittaranjan Sinha Department of Chemistry Inorganic Chemistry Section Jadavpur University Kolkata India Department of Chemistry Mrinalini Datta Mahavidyapith Birati India

Photochromism is the reversible structural change of the molecules upon light irradiation having different spectral pattern before and after irradiation. Liquid crystal (LC) is a long-range orientational order of the molecules in between solid and isotropic liquid phases which share the properties of the crystal and liquid phases. 1-Alkyl-2-(ary-lazo)imidazoles, (Raai-CnH2n+1, R = H, Me and n = 10, 12, 14, 16, 18, 20, 22) exhibits photochromism and two of them (Haai-C18H37 and Haai-C22H45) show Liquid crystal (LC) properties. One of these compounds, Meaai-C16H33 is structurally characterized by single crystal X-ray diffraction study. The compounds upon irradiation with UV light show E-to-Z isomerisation. Quantum yields (φE→Z) of E-to-Z isomerisation vary with the molar mass of the compounds. The reverse transformation, Z-to-E, is recorded in thermal condition. The activation energy (Ea) of isomerisation is determined by the controlled temperature reaction. Liquid crystal property of the molecules is examined by polarizing optical microscopy (POM) and DSC. The carbon chain length n = 18 shows nematic (N)-isotropic (I) phase transition and an unknown smectic (Sm) phase is observed with n = 22 on heating cycle.

关键词： Arylazoimidazoles Structure Photochromism Liquid Crystal Nematic-Isotropic Phase Transition smectic Phase

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