A Fluid Liquid-Crystal Material with Highly Polar Order

Hiroya Nishikawa, Kazuya Shiroshita, Hiroki Higuchi, Yasushi Okumura, Yasuhiro Haseba, Shin Ichi Yamamoto, Koki Sago, Hirotsugu Kikuchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An anomalously large dielectric permittivity of ≈104 is found in the mesophase temperature range (MP phase) wherein high fluidity is observed for a liquid-crystal compound having a 1,3-dioxane unit in the mesogenic core (DIO). In this temperature range, no sharp X-ray diffraction peak is observed at both small and wide Bragg angles, similar to that for a nematic phase; however, an inhomogeneous sandy texture or broken Schlieren one is observed via polarizing optical microscopy, unlike that for a conventional nematic phase. DIO exhibits polarization switching with a large polarization value, i.e., P = 4.4 µC cm−2, and a parallelogram-shaped polarization–electric field hysteresis loop in the MP phase. The inhomogeneously aligned DIO in the absence of an electric field adopts a uniform orientation along an applied electric field when field-induced polarization switching occurs. Furthermore, sufficiently larger second-harmonic generation is observed for DIO in the MP phase. Second-harmonic-generation interferometry clearly shows that the sense of polarization is inverted when the +/− sign of the applied electric field in MP is reversed. These results suggest that a unidirectional, ferroelectric-like parallel polar arrangement of the molecules is generated along the director in the MP phase.

Original languageEnglish
Article number1702354
JournalAdvanced Materials
Volume29
Issue number43
DOIs
Publication statusPublished - Nov 20 2017

Fingerprint

Liquid Crystals
Liquid crystals
Polarization
Fluids
Electric fields
Harmonic generation
Fluidity
Hysteresis loops
Interferometry
Ferroelectric materials
Optical microscopy
Permittivity
Textures
X ray diffraction
Temperature
Molecules

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Nishikawa, H., Shiroshita, K., Higuchi, H., Okumura, Y., Haseba, Y., Yamamoto, S. I., ... Kikuchi, H. (2017). A Fluid Liquid-Crystal Material with Highly Polar Order. Advanced Materials, 29(43), [1702354]. https://doi.org/10.1002/adma.201702354

A Fluid Liquid-Crystal Material with Highly Polar Order. / Nishikawa, Hiroya; Shiroshita, Kazuya; Higuchi, Hiroki; Okumura, Yasushi; Haseba, Yasuhiro; Yamamoto, Shin Ichi; Sago, Koki; Kikuchi, Hirotsugu.

In: Advanced Materials, Vol. 29, No. 43, 1702354, 20.11.2017.

Research output: Contribution to journalArticle

Nishikawa, H, Shiroshita, K, Higuchi, H, Okumura, Y, Haseba, Y, Yamamoto, SI, Sago, K & Kikuchi, H 2017, 'A Fluid Liquid-Crystal Material with Highly Polar Order', Advanced Materials, vol. 29, no. 43, 1702354. https://doi.org/10.1002/adma.201702354
Nishikawa H, Shiroshita K, Higuchi H, Okumura Y, Haseba Y, Yamamoto SI et al. A Fluid Liquid-Crystal Material with Highly Polar Order. Advanced Materials. 2017 Nov 20;29(43). 1702354. https://doi.org/10.1002/adma.201702354
Nishikawa, Hiroya ; Shiroshita, Kazuya ; Higuchi, Hiroki ; Okumura, Yasushi ; Haseba, Yasuhiro ; Yamamoto, Shin Ichi ; Sago, Koki ; Kikuchi, Hirotsugu. / A Fluid Liquid-Crystal Material with Highly Polar Order. In: Advanced Materials. 2017 ; Vol. 29, No. 43.
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