Negative viscosity of a liquid crystal in the presence of turbulence

Orihara, Hiroshi; Harada, Yuko; Kobayashi, Fumiaki et al.

Physical Review E, 2019, 99(1), 012701

Permalink : https://hdl.handle.net/2115/73006

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PhysRevE.99.012701 pdf 1.60 MB 980

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アクセス権
open access
URI
https://hdl.handle.net/2115/73006
タイトル
Negative viscosity of a liquid crystal in the presence of turbulence
著者
Orihara, Hiroshi ; Harada, Yuko ; Kobayashi, Fumiaki ; Sasaki, Yuji ; Fujii, Shuji ; Satou, Yuki ; Goto, Yoshitomo ; Nagaya, Tomoyuki
e-Rad_Researcher
30177307
著者名
Orihara, Hiroshi
著者名
Harada, Yuko
著者名
Kobayashi, Fumiaki
e-Rad_Researcher
00649741
著者名
Sasaki, Yuji
e-Rad_Researcher
40401781
著者名
Fujii, Shuji
著者名
Satou, Yuki
著者名
Goto, Yoshitomo
著者名
Nagaya, Tomoyuki
言語
英語
発行日
2019-01-02
出版者
American Physical Society (APS)
収録物名
Physical Review E
巻(号)
99(1)
ページ
012701
抄録
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.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
©2019 American Physical Society
PISSN
2470-0045
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1103/PhysRevE.99.012701