Giant Electroviscous Effects in a Ferroelectric Nematic Liquid Crystal

被引:12
作者
Kumar, M. Praveen [1 ]
Karcz, Jakub [2 ]
Kula, Przemyslaw [2 ]
Karmakar, Smarajit [3 ]
Dhara, Surajit [1 ]
机构
[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, India
[2] Mil Univ Technol, Inst Chem, Fac Adv Technol & Chem, Warsaw, Poland
[3] Tata Inst Fundamental Res, Hyderabad 500046, India
关键词
VISCOSITY COEFFICIENTS; SERIES;
D O I
10.1103/PhysRevApplied.19.044082
中图分类号
O59 [应用物理学];
学科分类号
摘要
The electroviscous effect deals with the change in the viscosity of fluids due to an external electric field. Here, we report experimental studies on the electroviscous effects in a ferroelectric nematic liquid crystal. It is synthesized by accomplishing an optimized synthetic route, which provides higher yield than the conventional one. We measure electric-field-dependent viscosity under a steady shear at different temperatures. In the low-field range, the increase in viscosity [Delta eta = eta(E) - eta(0)] is proportional to E-2 and the corresponding viscoelectric coefficient [f approximate to 10(-9) m(2)/V-2] of the ferroelectric nematic is 2 orders of magnitude larger than the apolar nematic liquid crystals and the largest ever measured for a fluid. The apparent viscosity measured under a high electric field shows a power-law divergence eta similar to (T - T-c)(-0.7 +/- 0.05), followed by nearly an order of magnitude drop below the N-N-F phase transition. Experimental results within the dynamical scaling approximation demonstrate rapid growth of polar domains under a strong electric field as the N-N-F phase transition is approached. The gigantic electroviscous effects demonstrated here are useful for emerging applications and understanding striking electrohydromechanical effects in ferroelectric nematic liquid crystals.
引用
收藏
页数:9
相关论文
共 49 条
[1]   Rheology of nematic liquid crystals with highly polar molecules [J].
Ananthaiah, J. ;
Sahoo, Rasmita ;
Rasna, M. V. ;
Dhara, Surajit .
PHYSICAL REVIEW E, 2014, 89 (02)
[2]   Effect of electric field on the rheological and dielectric properties of a liquid crystal exhibiting nematic-to-smectic-A phase transition [J].
Ananthaiah, J. ;
Rajeswari, M. ;
Sastry, V. S. S. ;
Dabrowski, R. ;
Dhara, S. .
EUROPEAN PHYSICAL JOURNAL E, 2011, 34 (08)
[3]  
ANDRADE END, 1946, PROC R SOC LON SER-A, V187, P296
[4]  
[Anonymous], US, DOI [10.1103/PhysRevApplied.19.044082, DOI 10.1103/PHYSREVAPPLIED.19.044082]
[5]   Explosive electrostatic instability of ferroelectric liquid droplets on ferroelectric solid surfaces [J].
Barboza, Raouf ;
Marni, Stefano ;
Ciciulla, Fabrizio ;
Mir, Farooq Ali ;
Nava, Giovanni ;
Caimi, Federico ;
Zaltron, Annamaria ;
Clark, Noel A. ;
Bellini, Tommaso ;
Lucchetti, Liana .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2022, 119 (32)
[6]   Critical splay fluctuations and colossal flexoelectric effect above the nonpolar to polar nematic phase transition [J].
Barthakur, Abinash ;
Karcz, Jakub ;
Kula, Przemyslaw ;
Dhara, Surajit .
PHYSICAL REVIEW MATERIALS, 2023, 7 (03)
[7]  
Born M., 1916, Sitzungsber, V30, P614
[8]   Multiple Polar and Non-polar Nematic Phases [J].
Brown, Stevie ;
Cruickshank, Ewan ;
Storey, John M. D. ;
Imrie, Corrie T. ;
Pociecha, Damian ;
Majewska, Magdalena ;
Makal, Anna ;
Gorecka, Ewa .
CHEMPHYSCHEM, 2021, 22 (24) :2506-2510
[9]   Surface alignment of ferroelectric nematic liquid crystals [J].
Caimi, Federico ;
Nava, Giovanni ;
Barboza, Raouf ;
Clark, Noel A. ;
Korblova, Eva ;
Walba, David M. ;
Bellini, Tommaso ;
Lucchetti, Liana .
SOFT MATTER, 2021, 17 (35) :8130-8139
[10]  
Chandrasekhar S., 1992, Liquid Crystals, V2