Evaluating the concentration of ions in liquid crystal cells: hidden factors and useful techniques

Garbovskiy, Yuriy

doi:10.3390/iocc_2020-07312

Cited by 3 publications

(2 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This information can be obtained by performing electrical characterization of liquid crystal materials [27,28,29 and references therein]. The obtained experimental results can be used to evaluate DC electrical conductivity, ion mobility and ion concentration in liquid crystals [30,31,32].…”

Section: Introductionmentioning

confidence: 99%

“…As a rule, electrical measurements of thermotropic liquid crystals are carried out using sandwich-like cells of a fixed thickness. At the same time, interactions between ions and substrates of a liquid crystal cell can result in dependence of the measured electrical conductivity on the cell thickness [32,33]. Even though the importance to consider interactions between ions and substrates of a liquid crystal cell for a proper interpretation of electrical measurements was emphasized many times [28 and references therein], only a very limited number of experimental reports can be found [34,35,36].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Steady-State and Transient Electrical Properties of Liquid Crystal Cells

Garbovskiy

Webb

2022

The 3rd International Online Conference on Crystals

Self Cite

View full text Add to dashboard Cite

Rapidly expanding and new applications of liquid crystal materials cover a wide range of technology products. A very incomplete list includes conventional and miniature high-resolution displays, AR/VR glasses, smart windows, dynamic lenses, tunable filters and retarders, electrically controlled sensors, reconfigurable antennas for wireless and space communications, and many other commercially available devices. The aforementioned devices are enabled by the collective reorientation of thermotropic molecular liquid crystals under the action of applied electric fields. The reorientation effects in liquid crystals can be altered by ionic contaminants typically present in mesogenic materials in small quantities. Therefore, information about ions in liquid crystals is very important because it allows for a proper selection of liquid crystal materials and uncompromised performance of liquid crystal devices. This information can be obtained by performing electrical measurements of liquid crystal materials. Measurements of basic electrical parameters (DC conductivity, charge mobility and ion density) are carried out using sandwich-like liquid crystal cells of finite thickness. Once a cell is filled with liquid crystal materials, interactions between ions and the cell substrates will result in the time dependence of the ion density and DC electrical conductivity until a steady state is reached. In this paper, we show how complementary information about ionic processes in liquid crystal cells can be obtained by analyzing their transient and steady state electrical properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Steady-State and Transient Electrical Properties of Liquid Crystal Cells

Garbovskiy

Webb

2022

The 3rd International Online Conference on Crystals

Self Cite

View full text Add to dashboard Cite

show abstract

Critical-like behavior of low-frequency dielectric properties in compressed liquid crystalline octyloxycyanobiphenyl (8OCB) and its nanocolloid with paraelectric BaTiO3

Łoś

Drozd-Rzoska

Rzoska

2023

Journal of Molecular Liquids

View full text Add to dashboard Cite

Overlooked Ionic Phenomena Affecting the Electrical Conductivity of Liquid Crystals

Webb

Garbovskiy

2021

The 2nd International Electronic Conference on Applied Sciences

View full text Add to dashboard Cite

Liquid crystal devices, such as displays, various tunable optical components, and sensors, are becoming increasingly ubiquitous. Basic physical properties of liquid crystal materials can be controlled by external physical fields, thus making liquid crystal devices dynamically reconfigurable. The tunability of liquid crystals offers exciting opportunities for the development of new applications, including advanced electronic and photonic devices, by merging the concepts of flat optics, tunable metasurfaces, nanoplasmonics, and soft matter biophotonics. As a rule, the tunability of liquid crystals is achieved by applying an electric field. This field reorients liquid crystals and changes their physical properties. Ions, typically present in liquid crystals in minute quantities, can alter the reorientation of liquid crystals through the well-known screening effect. Because the electrical conductivity of thermotropic liquid crystals is normally caused by ions, an understanding of ion generation processes in liquid crystals is of utmost importance to existing and emerging technologies relying on such materials. That is why measuring of electrical conductivity of liquid crystals is a standard part of their material characterization. Measuring the electrical conductivity of liquid crystals is a very delicate process. In this paper, we discuss overlooked ionic phenomena caused by interactions of ions with substrates of the liquid crystal cells. These interactions affect the measured values of the DC electrical conductivity of liquid crystals and make them dependent on the cell thickness.

show abstract

Evaluating the concentration of ions in liquid crystal cells: hidden factors and useful techniques

Cited by 3 publications

References 52 publications

Steady-State and Transient Electrical Properties of Liquid Crystal Cells

Steady-State and Transient Electrical Properties of Liquid Crystal Cells

Critical-like behavior of low-frequency dielectric properties in compressed liquid crystalline octyloxycyanobiphenyl (8OCB) and its nanocolloid with paraelectric BaTiO3

Overlooked Ionic Phenomena Affecting the Electrical Conductivity of Liquid Crystals

Contact Info

Product

Resources

About