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RIKEN Center for Emergent Matter Science (CEMS)

4 ARTICLES PUBLISHED IN JoVE

Engineering

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

¹RIKEN Center for Emergent Matter Science (CEMS)

Here, we present a protocol to trigger an orientational transition of a liquid crystal in response to temperature. Methodologies are described for preparing a sample in order to observe the transition and the detailed transitional evolution.

JoVE Core

Electric-field Control of Electronic States in WS₂ Nanodevices by Electrolyte Gating

Feng Qin¹, Toshiya Ideue¹, Wu Shi², Yijin Zhang^3,4, Ryuji Suzuki¹, Masaro Yoshida⁵, Yu Saito¹, Yoshihiro Iwasa^1,5

¹Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, ²Materials Sciences Division, Lawrence Berkeley National Laboratory, ³Institute of Scientific and Industrial Research, Osaka University, ⁴Max Planck Institute for Solid State Research, ⁵RIKEN Center for Emergent Matter Science (CEMS)

Here, we present a protocol to control the carrier number in solids by using the electrolyte.

Chemistry

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Shoichi Tokunaga^*1, Mengyan Zeng^*1,2, Yoshimitsu Itoh¹, Fumito Araoka³, Takuzo Aida³

¹Department of Chemistry and Biotechnology, The University of Tokyo, ²Department of Chemistry, Tsinghua University, ³RIKEN Center for Emergent Matter Science

A protocol for the fabrication of a reflective cholesteric liquid crystalline display device containing a redox-responsive chiral dopant allowing quick and low-voltage operation is presented.

Chemistry

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Satoshi Aya¹, Péter Salamon², Daniel A. Paterson³, John M. D. Storey³, Corrie T. Imrie³, Fumito Araoka¹, Antal Jákli⁴, Ágnes Buka²

¹RIKEN Center for Emergent Matter Science (CEMS), ²Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, ³Department of Chemistry, School of Natural and Computing Sciences, University of Aberdeen, ⁴Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University

This protocol demonstrates the preparation of a photorheological material that exhibits a solid phase, various liquid crystalline phases, and an isotropic liquid phase by increasing temperature. Presented here are methods for measuring the structure-viscoelasticity relationship of the material.