Liquid Crystals Reviews最新文献_第2页

Cholesteric dislocations in mica wedges 云母楔的胆固醇错位

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2021-12-20 DOI: 10.1080/21680396.2021.2020181

P. Pieranski

{"title":"Cholesteric dislocations in mica wedges","authors":"P. Pieranski","doi":"10.1080/21680396.2021.2020181","DOIUrl":"https://doi.org/10.1080/21680396.2021.2020181","url":null,"abstract":"A large part of the scientific legacy of Maurice Kleman concerns topological defects in liquid crystals. Here, we focus on the very first article of Kleman on liquid crystals coauthored with Jacques Friedel and devoted to linear defects in cholesterics discovered in 1921 by François Grandjean who observed them in wedges made from partially cleaved mica sheets. Kleman and Friedel interpreted the thin (single) and thick (double) Grandjean lines as dislocations with Burgers vectors equal respectively to p/2 (half pitch) or p (whole pitch) and have shown that they are composed of pairs of disclinations that they called τ and λ. We report on a recent work accomplished specifically in memoriam of Maurice Kleman, with the aim to show the beauty of nets of Grandjean lines in wedges made of mica sheets. Using crossed cylindrical sheets, we nucleated in a controlled manner dislocation loops of the two kinds persisting indefinitely independently of the local thickness and of the angle of the wedge. In thin wedges, surprisingly, the double dislocation loops are not smooth but contain one or two cusps corresponding to kinks predicted by Kleman and Friedel. Their presence is a fingerprint of the helicoidal symmetry of cholesterics.","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"1 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43261584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Geometric theory of topological defects: methodological developments and new trends 拓扑缺陷的几何理论:方法论的发展和新趋势

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2021-07-03 DOI: 10.1080/21680396.2022.2163515

S. Fumeron, B. Berche, F. Moraes

引用次数: 4

Liquid crystals as signal transducers for sensing of analytes using aptamer as a recognition probe 液晶作为信号换能器，用适体作为识别探针来检测分析物

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2021-07-03 DOI: 10.1080/21680396.2022.2053597

M. Devi, I. Pani, S. Pal

{"title":"Liquid crystals as signal transducers for sensing of analytes using aptamer as a recognition probe","authors":"M. Devi, I. Pani, S. Pal","doi":"10.1080/21680396.2022.2053597","DOIUrl":"https://doi.org/10.1080/21680396.2022.2053597","url":null,"abstract":"ABSTRACT The long-range orientational order of liquid crystals (LCs) makes them excellent responsive materials for amplification and transduction of various biochemical events occurring at their interfaces. LC interfaces have been vastly explored for sensing of various macromolecules such as endotoxin, proteins, and disease markers. LC-based sensors possess several advantages over conventional methods in terms of not requiring intensive labour, label-free detection, and low-cost fabrication. However, the first challenge is to ensure the specificity of LC response towards a particular analyte. The second challenge is to design sensing platforms for the detection of small molecule analytes with equal selectivity and sensitivity. In this regard, aptamers have emerged as promising recognition probes due to their high binding affinity towards small molecules, high stability over antibodies, and fast response. The integration of aptamer-based sensing with LC interfaces has enabled the detection of deoxyribonucleic acid (DNA) targets, biologically important toxins, environmental pollutants, heavy metal ions, etc., with applicability in clinical samples. In this review, we recapitulate the recent advancements in the design of aptamer-based LC biosensors for the detection of DNA targets (by DNA hybridization), various biomolecules, and metal ions. GRAPHICAL ABSTRACT","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"9 1","pages":"65 - 84"},"PeriodicalIF":5.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46749389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Recent progress at the interface between nanomaterial chirality and liquid crystals 纳米材料手性与液晶界面研究进展

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2021-01-02 DOI: 10.1080/21680396.2021.1930596

Diana P. N. Gonçalves, M. Prévôt, Şenay Üstünel, Timothy Ogolla, Ahlam Nemati, Sasan Shadpour, T. Hegmann

{"title":"Recent progress at the interface between nanomaterial chirality and liquid crystals","authors":"Diana P. N. Gonçalves, M. Prévôt, Şenay Üstünel, Timothy Ogolla, Ahlam Nemati, Sasan Shadpour, T. Hegmann","doi":"10.1080/21680396.2021.1930596","DOIUrl":"https://doi.org/10.1080/21680396.2021.1930596","url":null,"abstract":"Chirality of nanomaterials is a rapidly evolving field, largely driven by the unique optical, electronic, magnetic or catalytic properties of plasmonic, magnetic and semiconductor nanomaterials among others. Liquid crystals continue to play a major role in developing a better understanding of their inherent chiroptical properties as well as serving as reporters to quantify and visualize nanomaterial chirality. Furthermore, liquid crystal phases are increasingly explored as potentially tuneable templates for the helical assembly of various types of nanomaterials. This review summarizes recent progress in this area by describing representative examples and key strategies pursued to interface nanomaterial and liquid crystal chirality. These studies focus on a range of organic and inorganic nanomaterials varying in size, shape and composition as well as on both thermotropic and lyotropic liquid crystal phases. Finally, the two materials concepts merge when liquid crystal molecules self-assemble into distinct filamentous chiral nanoshapes capable of templating other nanomaterials. GRAPHICAL ABSTRACT","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"9 1","pages":"1 - 34"},"PeriodicalIF":5.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21680396.2021.1930596","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48926735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Liquid crystal technology for vergence-accommodation conflicts in augmented reality and virtual reality systems: a review 增强现实和虚拟现实系统中收敛调节冲突的液晶技术综述

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2021-01-02 DOI: 10.1080/21680396.2021.1948927

Yu-Jen Wang, Yi-Hsin Lin

{"title":"Liquid crystal technology for vergence-accommodation conflicts in augmented reality and virtual reality systems: a review","authors":"Yu-Jen Wang, Yi-Hsin Lin","doi":"10.1080/21680396.2021.1948927","DOIUrl":"https://doi.org/10.1080/21680396.2021.1948927","url":null,"abstract":"With the help of augmented reality (AR) and virtual reality (VR) systems, users can receive information and connect with each other via near-eye displays (NEDs). However, several challenges need to be addressed, and the optics are the major bottlenecks. Users wearing current NEDs typically suffer from vergence-accommodation conflict (VAC). Furthermore, people with refractive errors need a pair of prescription lenses to clearly see the virtual image and/or environment. Hence, VAC-free AR/VR systems with vision correction functions should be developed. Furthermore, the AR/VR systems must be designed with slim form factors. Liquid crystal (LC) optical elements with a thin form factor have been demonstrated for light modulation in versatile optical systems; thus, LC-based solutions have been proposed for AR/VR systems in the past decade. Herein, we provide a comprehensive review on the existing literature on LC-based optical systems and suggest possible solutions to realize a better NED system. This review provides an overview of the state-of-the-art progress of LC optics in AR and VR systems. It focuses on the fundamental optics of NEDs, origins of VAC and current LC-based solutions, LC lenses for vision correction function, and the guidelines for solving the two aforementioned challenges using LC lenses.","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"9 1","pages":"35 - 64"},"PeriodicalIF":5.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21680396.2021.1948927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46605745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Effects of photoswitching in complex partially ordered systems 复杂部分有序系统中的光开关效应

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2020-01-02 DOI: 10.1080/21680396.2020.1867662

A. Eremin

引用次数: 2

Effect of phase transitions on liquid crystal colloids: a short review 相变对液晶胶体的影响

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2020-01-02 DOI: 10.1080/21680396.2021.1904298

K. P. Zuhail, M. Humar, S. Dhara

引用次数: 2

Memoirs of my time at Kent State University during formation of the Liquid Crystal Institute 我在肯特州立大学液晶研究所成立期间的回忆录

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2020-01-02 DOI: 10.1080/21680396.2020.1734492

L. Gulrich

引用次数: 0

Heterodimeric hydrogen-bonded mesogens comprising pyridine moiety: a review 含吡啶部分的异质二聚氢键介晶：综述

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2020-01-02 DOI: 10.1080/21680396.2020.1816861

Deepak Devadiga, T. N. Ahipa

{"title":"Heterodimeric hydrogen-bonded mesogens comprising pyridine moiety: a review","authors":"Deepak Devadiga, T. N. Ahipa","doi":"10.1080/21680396.2020.1816861","DOIUrl":"https://doi.org/10.1080/21680396.2020.1816861","url":null,"abstract":"Hydrogen bonding plays an important role in building the super-structures in chemical and biological systems because of its specificity and directionality. In this context, significant works have been conducted recently to study the role of hydrogen bonding interactions in the formation and/or stabilization of mesophases. Also, this flexible and active non-covalent interaction has been widely utilized in other fields such as self-assembly, crystal engineering, polymer chemistry and nanotechnology. However, hydrogen bond interactions have emerged in recent years as a tunable supramolecular synthetic method with adjustable phases and properties in the design of efficient liquid crystalline materials. The present critical review describes the preparation of various pyridine-based hetero-dimeric hydrogen-bonded mesogenic complexes, which were reported over the last 10 years and are mainly made of calamitic, bent, discotic and polymers. Also, it covers the structure, mesophase stability, role of various terminal/lateral substituents, and future perspectives of these complexes. GRAPHICAL ABSTRACT","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"8 1","pages":"5 - 28"},"PeriodicalIF":5.1,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21680396.2020.1816861","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48389976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Design of nematic liquid crystals to control microscale dynamics. 控制微尺度动力学的向列液晶设计。

IF 5.1 3区材料科学

Liquid Crystals Reviews Pub Date : 2020-01-01 Epub Date: 2021-05-26 DOI: 10.1080/21680396.2021.1919576

Oleg D Lavrentovich

{"title":"Design of nematic liquid crystals to control microscale dynamics.","authors":"Oleg D Lavrentovich","doi":"10.1080/21680396.2021.1919576","DOIUrl":"10.1080/21680396.2021.1919576","url":null,"abstract":"<p><p>The dynamics of small particles, both living such as swimming bacteria and inanimate, such as colloidal spheres, has fascinated scientists for centuries. If one could learn how to control and streamline their chaotic motion, that would open technological opportunities in the transformation of stored or environmental energy into systematic motion, with applications in micro-robotics, transport of matter, guided morphogenesis. This review presents an approach to command microscale dynamics by replacing an isotropic medium with a liquid crystal. Orientational order and associated properties, such as elasticity, surface anchoring, and bulk anisotropy, enable new dynamic effects, ranging from the appearance and propagation of particle-like solitary waves to self-locomotion of an active droplet. By using photoalignment, the liquid crystal can be patterned into predesigned structures. In the presence of the electric field, these patterns enable the transport of solid and fluid particles through nonlinear electrokinetics rooted in anisotropy of conductivity and permittivity. Director patterns command the dynamics of swimming bacteria, guiding their trajectories, polarity of swimming, and distribution in space. This guidance is of a higher level of complexity than a simple following of the director by rod-like microorganisms. Namely, the director gradients mediate hydrodynamic interactions of bacteria to produce an active force and collective polar modes of swimming. The patterned director could also be engraved in a liquid crystal elastomer. When an elastomer coating is activated by heat or light, these patterns produce a deterministic surface topography. The director gradients define an activation force that shapes the elastomer in a manner similar to the active stresses triggering flows in active nematics. The patterned elastomer substrates could be used to define the orientation of cells in living tissues. The liquid-crystal guidance holds a major promise in achieving the goal of commanding microscale active flows.</p>","PeriodicalId":18087,"journal":{"name":"Liquid Crystals Reviews","volume":"8 2","pages":"59-129"},"PeriodicalIF":5.1,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21680396.2021.1919576","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39852813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18