Liquid crytals (LCs) are probably the most exciting state of matter. They attract scientists across disciplines such as chemistry, physics, materials science, and engineering—theorists and experimentalists alike. These days, you can buy quite affordable LCD TV sets around the corner, but that's just one of the many things liquid crystals can do. The selection of recent research articles presented below illustrates the broad interest in this area of soft condensed matter.
J. W. Goodby, P. J. Collings, T. Kato, C. Tschierske, H. Gleeson,
Handbook of Liquid Crystals
2nd edition, Wiley-VCH, Weinheim, 2014.
Find all articles on liquid crystals in Wiley Online Library...
See the International Liquid Crystal Society's website.
Series of newly synthesized rod-like polycatenar mesogens was found to form columnar phases with the number of molecules in the column cross-section depending on the core rigidity. For non-symmetric molecules the additional density modulation - helical arrangement of molecules developed along the columns, with periodicity of ~10 molecular distances. For one of the compounds new type of columnar LC phase was observed with 3D positional order. Introducing stilbene unit in the mesogenic core enhanced fluorescent properties of the compounds, in Colh phase the polarized light emission was observed.
Joanna Maria Wolska, Neha Topnani, Ewa Gorecka, Jozef Mieczkowski, Damian Pociecha
ChemPhysChem, May 23, 2016, DOI: 10.1002/cphc.201600330. Read article
Two isomeric cyanostilbene photoswitchable bent-core mesogens with polar liquid crystal phases in which macroscopic polarization and luminescence can be light-modulated are claimed. Z/E isomerization or [2+2] cycloaddition photochemical processes occur depending on the chemical structure, which make the compounds very innovative multifunctional advanced materials.
Marta Martínez-Abadía, Beatriz Robles-Hernández, María Rosario de la Fuente, Raquel Giménez, Maria Blanca Ros
Adv. Mater., May 23, 2016, DOI: 10.1002/adma.201600311. Read article
An easily scalable and modular method is developed to create an array of responsive fibers. The fibers are able to respond to UV light in a concerted way to mimic the natural cilia motion. This efficient collective bending gives a directional transport of floating object by use of light. Such hairy surfaces could be integrated in microfluidic device.
Anne Helene Gelebart, Matthew Mc Bride, Albertus P. H. J. Schenning, Christopher N. Bowman, Dirk J. Broer
Adv. Funct. Mater., May 23, 2016, DOI: 10.1002/adfm.201601221. Read article
Zwitterionic derivatives of the [closo-1-CB11H12]– anion form liquid-crystalline phases and improve the dielectric properties of nematic liquid-crystal materials.
Jacek Pecyna, Remigiusz Żurawiński, Piotr Kaszyński, Damian Pociecha, Piotr Zagórski, Serhii Pakhomov
Eur. J. Inorg. Chem., April 27, 2016, DOI: 10.1002/ejic.201600240. Read article.
Total recoil: A novel foldamer scaffold, in which p-phenyleneethynylene units are linked by chiral carbon atoms, is reported. In very dilute solutions, these oligomers are random coils. The hexamer and octamers form a hexagonal lyotropic liquid crystal in CH2Cl2 when the concentrations reach the critical values.
Yu Chen, Zhiqiang Zhao, Zheng Bian, Rizhe Jin, Chuanqing Kang, Xuepeng Qiu, Haiquan Guo, Zhijun Du, Lianxun Gao
ChemistryOpen, April 27, 2016, DOI: 10.1002/open.201600007. Read article
Versatile Suzuki cross-coupling reactions between arylboronic acids and triphenylenyl triflates generate a rich diversity of attractive functional discogens.
Ke-Qing Zhao, Yue Gao, Wen-Hao Yu, Ping Hu, Bi-Qin Wang, Benoît Heinrich, Bertrand Donnio
Eur. J. Org. Chem., April 13, 2016, DOI: 10.1002/ejoc.201600270. Read article.
Unlocking molecule release: A dual-responsive lyotropic liquid crystal system for the controlled release of molecules is reported.
Dong Wang, Yueying Cao, Meiwen Cao, Yawei Sun, Jiqian Wang, Jingcheng Hao
ChemPhysChem, April 08, 2016, DOI: 10.1002/cphc.201600066. Read article
A simple modular design was used to impart liquid-crystalline properties to iridium complexes without modification of their photophysical properties. Annealed films of the liquid-crystalline complexes display hole mobilities up to three orders of magnitude higher than parent iridium complex without mesogenic groups and are the highest values reported to date for iridium complexes (see figure).
Yafei Wang, Christopher P. Cabry, ManJun Xiao, Louise Male, Stephen J. Cowling, Duncan W. Bruce, Junwei Shi, Weiguo Zhu, Etienne Baranoff
Chem. Eur. J., December 22, 2015, DOI: 10.1002/chem.201504669. Read article.
Changing states: The cohesive free energy density concept (CFED) is applied to thermotropic cyanobiphenyl-based liquid crystals to establish predictive quantitative correlations between each antagonist segments of the amphiphilic molecules (flexible alkyl tail/rigid aromatic core) and their transition temperatures (solid→liquid crystalline/liquid crystalline→ isotropic liquid; see figure).
Thibault Dutronc, Emmanuel Terazzi, Laure Guénée, Kerry-Lee Buchwalder, Sébastien Floquet, Claude Piguet
Chem. Eur. J., December 14, 2015, DOI: 10.1002/chem.201503420. Read article.