title: Electric-field-induced patterns and their temperature dependence in a bent-core liquid crystal.
abstract: Two kinds of electroconvection patterns in an ether-bridged bent-core nematic liquid crystal material (BCN), which appear in different frequency ranges, are examined and compared. One is a longitudinal pattern with the stripes parallel to the orientation of the BCN and with a periodicity of approximately the cell thickness, occurring in the high-frequency range of several hundreds Hz; the other one is oblique stripes, which results in a zigzag pattern, and appears in the low-frequency range of several tens Hz. In addition, within an intermediate-frequency range, transformations from oblique to longitudinal and then to normal stripes occur at increased ac voltages. In particular, we investigated the temperature behavior of longitudinal and oblique stripes: When the temperature T increases and approaches the clearing temperature Tc, the contrast of the domains is enhanced and the frequency range of existence becomes wider, while the onset voltages increase only moderately instead of diverging, thus suggesting an isotropic mechanism of pattern formation.
authors.affiliation: School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xiang
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Yi-Kun
authors.initials: YK
authors.lastname: Liu
authors.affiliation: Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Konkoly Thege Miklós út 29-33, H-1121 Budapest, Hungary.
authors.forename: Ágnes
authors.initials: Á
authors.lastname: Buka
authors.affiliation: Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Konkoly Thege Miklós út 29-33, H-1121 Budapest, Hungary.
authors.forename: Nándor
authors.initials: N
authors.lastname: Éber
authors.affiliation: Department of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, People's Republic of China.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Zhang
authors.affiliation: School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
authors.forename: Ming-Ya
authors.initials: MY
authors.lastname: Xu
authors.affiliation: School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
authors.forename: Everett
authors.initials: E
authors.lastname: Wang
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D004574:Electromagnetic Fields; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D011829:Radiation Dosage; D013696:Temperature