globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2002290117
论文题名:
First-principles experimental demonstration of ferroelectricity in a thermotropic nematic liquid crystal: Polar domains and striking electro-optics
作者: Chen X.; Chen X.; Korblova E.; Korblova E.; Dong D.; Dong D.; Wei X.; Wei X.; Shao R.; Shao R.; Radzihovsky L.; Radzihovsky L.; Glaser M.A.; Glaser M.A.; MacLennan J.E.; MacLennan J.E.; Bedrov D.; Bedrov D.; Walba D.M.; Walba D.M.; Clark N.A.; Clark N.A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:25
起始页码: 14021
结束页码: 14031
语种: 英语
英文关键词: Ferroelectric ; Liquid ; Liquid crystal ; Nematic ; Polar
Scopus关键词: Article ; birefringence ; chemical structure ; correlational study ; dipole ; electric field ; electricity ; hydrodynamics ; liquid crystal ; low temperature ; molecular dynamics ; molecular interaction ; optics ; polarization ; priority journal ; solid state ; static electricity ; temperature measurement
英文摘要: We report the experimental determination of the structure and response to applied electric field of the lower-temperature nematic phase of the previously reported calamitic compound 4-[(4-nitrophenoxy) carbonyl]phenyl2,4-dimethoxybenzoate (RM734). We exploit its electro-optics to visualize the appearance, in the absence of applied field, of a permanent electric polarization density, manifested as a spontaneously broken symmetry in distinct domains of opposite polar orientation. Polarization reversal is mediated by field-induced domain wall movement,making this phase ferroelectric, a 3D uniaxial nematic having a spontaneous, reorientable polarization locally parallel to the director. This polarization density saturates at a low temperature value of ~6 μC/cm2, the largest ever measured for a fluid or glassy material. This polarization is comparable to that of solid state ferroelectrics and is close to the average value obtained by assuming perfect, polar alignment of molecular dipoles in the nematic. We find a host of spectacular optical and hydrodynamic effects driven by ultralow applied field (E ~ 1 V/cm), produced by the coupling of the large polarization to nematic birefringence and flow. Electrostatic selfinteraction of the polarization charge renders the transition from the nematic phase mean field-like and weakly first order and controls the director field structure of the ferroelectric phase. Atomistic molecular dynamics simulation reveals short-range polar molecular interactions that favor ferroelectric ordering, including a tendency for head-to-tail association into polar, chain-like assemblies having polar lateral correlations. These results indicate a significant potential for transformative, new nematic physics, chemistry, and applications based on the enhanced understanding, development, and exploitation of molecular electrostatic interaction. © 2020 National Academy of Sciences. All rights reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163453
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Chen, X., Department of Physics, University of Colorado, Boulder, CO 80309, United States; Chen, X., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Korblova, E., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Korblova, E., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Dong, D., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Dong, D., Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, United States; Wei, X., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Wei, X., Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, United States; Shao, R., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Shao, R., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Radzihovsky, L., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Radzihovsky, L., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Glaser, M.A., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Glaser, M.A., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; MacLennan, J.E., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; MacLennan, J.E., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Bedrov, D., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, United States; Bedrov, D., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, United States; Walba, D.M., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Walba, D.M., Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Clark, N.A., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States; Clark, N.A., Department of Physics, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States

Recommended Citation:
Chen X.,Chen X.,Korblova E.,et al. First-principles experimental demonstration of ferroelectricity in a thermotropic nematic liquid crystal: Polar domains and striking electro-optics[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(25)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Chen X.]'s Articles
[Chen X.]'s Articles
[Korblova E.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Chen X.]'s Articles
[Chen X.]'s Articles
[Korblova E.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Chen X.]‘s Articles
[Chen X.]‘s Articles
[Korblova E.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.