Nanocomposite based on a liquid crystal doped with aluminum nitride nanotubes for optical sensor of sulfur dioxide

Abstract

It has been demonstrated the possibilities of designing the material for optical sensor primary transducer. The nanocomposites based on a cholesteric liquid crystal with aluminum nitride for material of primary transducer of sulfur dioxide optical sensor were studied. The spectral characteristics of studied nanocomposite under the influence of sulfur dioxide were studied. The shift of central wavelength of selective reflection under the sulfur dioxide concentrations was observed.

Optical properties of composite heterophase objects with liquid crystal material for different display applications

“…Firstly, the phase difference parameter Φ introduced in was calculated: Φ(θ( z )) = ΔΦ(θ( z ))/ΔΦ max (θ 0 ), where ΔΦ is the phase retardation difference and θ( z ) is the LC director distribution. ΔΦ(θ( z )) is described by the formula as follows: …”

“…There are porous systems made of polymers or solid crystals with the LC incorporated into the pores or confined space: polymer dispersed liquid crystals (PDLC), polymer stabilzed liquid crystals, fibers, porous silicon, or porous anodized aluminum oxide . Recently, many developments are described with mesogens comprising microparticles and nanoparticles for reduction of operation voltage or switching time . Such particles can have different shape: almost spherical, elongated like nanowires or disc‐like.…”

“…16,17 Recently, many developments are described with mesogens comprising microparticles and nanoparticles for reduction of operation voltage or switching time. [18][19][20][21][22] Such particles can have different shape: almost spherical, elongated like nanowires or disc-like.…”

Investigation of spectral characteristics of cholesteric liquid crystals at carbohydrates influence

“…To resolve the problems caused by the difficulty of registration of the selected optical effect, a complex multi-layered structure of the sensing element, and the high cost of the active medium material, we propose to use a cholesteric liquid crystal as a material for the sensing element of optical carbohydrate sensors. The information signal in such sensors is formed by selective reflection (transmission) of light in the sensitive medium of primary converters of optical sensors [12,13].…”

Features of the transition to the isotropic state of the liquid crystal sensitive element of the gas sensor under the action of acetone vapor

“…In general, a suitable marker of the disease can be almost any substance that appears outside the normal state in the exhalation gases, is related to the process of a particular disease or pathology, and is available for detection by modern technical means [6][7][8].…”