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Liquid Crystals

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.

Recommended Reading

J. W. Goodby, P. J. Collings, T. Kato, C. Tschierske, H. Gleeson, P. Raynes (Eds)
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.

Recent Articles

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Hierarchical Structures Formed by Flexible Dendrimeric Molecules Based on Gallic Acid

Hierarchical Structures Formed by Flexible Dendrimeric Molecules Based on Gallic Acid

Mesogenic behavior of first-generation dendrons based on gallic acid is determined by the number of alkyl chains at the outer phenyl rings, only those having three chains per phenyl ring form cubic liquid crystalline phase. Molecules self-assemble into spherical micelles that are arranged into 3D lattice of Pm3n symmetry, and the unit cell is filled with eight micelles.

[Full Paper]
Joanna Matraszek, Ewa Gorecka, Józef Mieczkowski, Monika Hejko, Damian Pociecha
Macromol. Chem. Phys., October 12, 2017, https://doi.org/10.1002/macp.201700316 Read article

Non-Uniform Optical Inscription of Actuation Domains in a Liquid Crystal Polymer of Uniaxial Orientation: An Approach to Complex and Programmable Shape Changes

Non‐Uniform Optical Inscription of Actuation Domains in a Liquid Crystal Polymer of Uniaxial Orientation: An Approach to Complex and Programmable Shape Changes

Roll with the changes: An easily processable liquid crystal polymer with only uniaxial orientation of mesogens can be programmed to display multiple, complex shape morphing on a single piece of the material (eight changes are shown in the picture). The approach consists in using photocrosslinking to spatially configure and organize the actuation domains in mechanically stretched specimen.

[Communication]
Rong Yang, Yue Zhao
Angew. Chem. Int. Ed., October 11, 2017, https://doi.org/10.1002/anie.201709528 Read article

A Fluid Liquid-Crystal Material with Highly Polar Order

A Fluid Liquid‐Crystal Material with Highly Polar Order

An anomalously large dielectric permittivity of ≈104 is found for a liquid-crystal compound having a 1,3-dioxane unit (DIO) in the high-fluid mesophase temperature range. In addition, DIO shows ferroelectric-like polarization of 4.4 µC cm−2, which is several hundred times larger than those of conventional ferroelectric chiral smectic C materials, and second-harmonic-generation activity.

[Communication]
Hiroya Nishikawa, Kazuya Shiroshita, Hiroki Higuchi, Yasushi Okumura, Yasuhiro Haseba, Shin-ichi Yamamoto, Koki Sago, Hirotsugu Kikuchi
Adv. Mater., October 10, 2017, https://doi.org/10.1002/adma.201702354 Read article

Highly Aligned Plasmonic Gold Nanorods in a DNA Matrix

Highly Aligned Plasmonic Gold Nanorods in a DNA Matrix

Orientation of gold nanorods (GNRs) can be successfully controlled using DNA material based on the host–guest strategy. Simple shearing of DNA–GNR solution causes long-range ordering of GNRs, showing parallel, perpendicular, and zigzag orientations based on the competition between the shearing effect and DNA elasticity. The resulting platform is applicable for plasmonic nanoparticles for potential optical and photonic applications.

[Full Paper]
Yun Jeong Cha, Dae Seok Kim, Dong Ki Yoon
Adv. Funct. Mater., October 10, 2017, https://doi.org/10.1002/adfm.201703790 Read article

Long-Lived Supramolecular Helices Promoted by Fluorinated Photoswitches

Long‐Lived Supramolecular Helices Promoted by Fluorinated Photoswitches

Azobenzene photoswitches combining ortho-fluorination and axial chirality are synthesized. When used as dopants in nematic liquid crystals, they promote long-lived supramolecular helices both in the dark and under illumination.

[Communication]
He Huang, Tetiana Orlova, Benjamin Matt, Nathalie Katsonis
Macromol. Rapid Commun., September 12, 2017, https://doi.org/10.1002/marc.201700387 Read article

Reversible Broad-Spectrum Control of Selective Reflections of Chiral Nematic Phases by Closed-/Open-Type Axially Chiral Azo Dopants

Reversible Broad‐Spectrum Control of Selective Reflections of Chiral Nematic Phases by Closed‐/Open‐Type Axially Chiral Azo Dopants

High-chirality photocontrol: The reversible broad-spectrum control of selective reflections of opposite-handed chiral nematics by using new chiral dopants is demonstrated. Quick reversible RGB color switching is achieved by using closed types, whereas open types provide broad reflection spectrum changes across the whole visible and NIR/SWIR ranges (see figure).

[Full Paper]
Hiroya Nishikawa, Daigou Mochizuki, Hiroki Higuchi, Yasushi Okumura, Hirotsugu Kikuchi
ChemistryOpen, September 05, 2017, https://doi.org/10.1002/open.201700121 Read article

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