論文

査読有り
2019年1月

Negative viscosity of a liquid crystal in the presence of turbulence

PHYSICAL REVIEW E
  • Hiroshi Orihara
  • ,
  • Yuko Harada
  • ,
  • Fumiaki Kobayashi
  • ,
  • Yuji Sasaki
  • ,
  • Shuji Fujii
  • ,
  • Yuki Satou
  • ,
  • Yoshitomo Goto
  • ,
  • Tomoyuki Nagaya

99
1
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevE.99.012701
出版者・発行元
AMER PHYSICAL SOC

We report on the discovery of enormous negative viscosity in a nematic liquid crystal in the presence of turbulence induced by electric fields. As the negative viscosity in this system is so large, we are able to observe several phenomena originating from it. For example, we observe a spontaneous shear flow that rotates the upper disk of a rheometer, as well as the reversal of the rotational direction upon applying an external torque in the opposite direction. Hysteresis loops are also observed in the shear-stress-shear-rate curves, which is reminiscent of those seen for ferromagnetic and ferroelectric materials. The similarities between the phenomena observed for our system and ferroic materials are comprehensively demonstrated, although the two systems are fundamentally different in that the former is out of equilibrium. We elucidate the origin of the negative viscosity and propose a simple model that reproduces the phenomena observed in this active fluid.

Web of Science ® 被引用回数 : 6

リンク情報
DOI
https://doi.org/10.1103/PhysRevE.99.012701
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000454769800010&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevE.99.012701
  • ISSN : 2470-0045
  • eISSN : 2470-0053
  • Web of Science ID : WOS:000454769800010

エクスポート
BibTeX RIS