SAW Investigation of Structural Changes in Liquid Crystals Doped with Magnetic Particles

被引：9
作者：
Bury, P. [1 ]
Vevericik, M. [1 ]
Kudelcik, J. [1 ]
Kopcansky, P. [2 ]
Timko, M. [2 ]
Zavisova, V. [2 ]
机构：
[1] Univ Zilina, Fac Elect Engn, Dept Phys, Univ 1, Zilina 01026, Slovakia
[2] Slovak Acad Sci, Inst Expt Phys, Watsonova 47, Kosice 04001, Slovakia
来源：
ACTA ACUSTICA UNITED WITH ACUSTICA | 2018年 / 104卷 / 01期
关键词：
SURFACE ACOUSTIC-WAVES; PHASE-TRANSITIONS; TRANSFORMATIONS; ORIENTATION; BEHAVIOR; SENSOR;
D O I：
10.3813/AAA.919144
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
The surface acoustic waves (SAW) were used to study the effect of magnetic particles on liquid crystals (6CHBT) structural changes in electric and weak magnetic fields using measurements of the attenuation of SAW propagating along ferronematic liquid crystals. The magnetic nanoparticles in low volume concentration (F = 1.10(-4), 1.10(-5), 5.10(-5)) were added to the liquid crystal during its isotropic phase. In contrast to undoped 6CHTB the distinctive SAW attenuation responses induced by both electric and weak magnetic fields in studied ferronematic liquid crystals have been observed suggesting both structural changes and the orientational coupling between both electric and magnetic moments of magnetic particles and the director of the liquid crystal.
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收藏
页码：48 / 53
页数：6
相关论文
共 28 条
[1]   THEORY OF MAGNETIC SUSPENSIONS IN LIQUID CRYSTALS [J].
BROCHARD, F ;
GENNES, PGD .
JOURNAL DE PHYSIQUE, 1970, 31 (07) :691-&
[2]   Effect of spherical magnetic particles on liquid crystals behavior studied by surface acoustic waves [J].
Bury, Peter ;
Kudelcik, Jozef ;
Hardon, Stefan ;
Vevericik, Marek ;
Kopcansky, Peter ;
Timko, Milan ;
Zavisova, Vlasta .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2017, 423 :57-60
[3]   Structural Changes in Ferronematic Liquid Crystals Studied by Surface Acoustic Waves [J].
Bury, Peter ;
Hardon, Stefan ;
Kudelcik, Jozef ;
Timko, Milan ;
Kopcansky, Peter .
20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015, 2015, 75 :1022-1028
[4]   Macroscopic properties of ferronematics caused by orientational interactions on the particle surfaces .1. Extended continuum model [J].
Burylov, SV ;
Raikher, YL .
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1995, 258 :107-122
[5]   Particular thermally induced phase separation of liquid crystal and poly(N-vinyl carbazole) films and its application [J].
Chen, Yuan-Di ;
Fuh, Andy Ying-Guey ;
Cheng, Ko-Ting .
OPTICS EXPRESS, 2012, 20 (15) :16777-16784
[6]  
De Gennes P. G., 1974, The Physics of Liquid Crystals
[7]   ULTRASONIC MEASUREMENTS OF THE ANISOTROPIC VISCOELASTIC PROPERTIES OF A NEMATIC ELASTOMER [J].
DEEG, FW ;
DIERCKSEN, K ;
SCHWALB, G ;
BRAUCHLE, C ;
REINECKE, H .
PHYSICAL REVIEW B, 1991, 44 (06) :2830-2833
[8]   Evaluation of nematic liquid-crystal director-orientation using shear horizontal wave propagation [J].
Inoue, M ;
Yoshino, K ;
Moritake, H ;
Toda, K .
JOURNAL OF APPLIED PHYSICS, 2002, 91 (05) :2798-2802
[9]   Ultrasound-initiated structural transformations in liquid crystals (A review) [J].
Kapustina, O. A. .
ACOUSTICAL PHYSICS, 2008, 54 (02) :180-196
[10]   Structural changes in the 6CHBT liquid crystal doped with spherical, rodlike, and chainlike magnetic particles [J].
Kopcansky, Peter ;
Tomasovicova, Natalia ;
Koneracka, Martina ;
Zavisova, Vlasta ;
Timko, Milan ;
Dzarova, Anezka ;
Sprincova, Adriana ;
Eber, Nandor ;
Fodor-Csorba, Katalin ;
Toth-Katona, Tibor ;
Vajda, Aniko ;
Jadzyn, Jan .
PHYSICAL REVIEW E, 2008, 78 (01)
123