Electro-optical properties and frequency response of polymer-dispersed liquid crystal gratings doped with multi-walled carbon nanotubes

Liu, Yourong; Shen, Jinrong; Shen, Tong; Jiao, Z.; Zhuang, Songlin

doi:10.1007/s10853-021-06104-9

Cited by 7 publications

(5 citation statements)

References 36 publications

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“…The doped LC materials demonstrated improved electro-optical characteristics. The electro-optical properties and frequency response of polymer-dispersed LC doped with MWCNTs have been reported [251]. Diffusion of MWCNTs into the LC regions was observed during the polymerization.…”

Section: Polymer-dispersed Liquid Crystalsmentioning

confidence: 99%

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Lisetski

Bulavin

Lebovka

2023

Liquids

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The current state of the study of different liquid crystalline (LC) systems doped with carbon nanotubes (CNTs) is discussed. An attempt is endeavored to outline the state-of-the-art technology that has emerged after two past decades. Systematization and analysis are presented for the integration of single- and multi-walled carbon nanotubes in thermotropic (nematic, smectic, cholesteric, ferroelectric, etc.) and lyotropic LCs. Special attention is paid to the effects of alignment and supramolecular organization resulting from orientational coupling between CNTs and the LC matrix. The effects of the specific inter-molecular and inter-particle interactions and intriguing microstructural, electromagnetic, percolation, optical, and electro-optical properties are also discussed.

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Section: Polymer-dispersed Liquid Crystalsmentioning

confidence: 99%

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Lisetski

Bulavin

Lebovka

2023

Liquids

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“…However, a huge issue with such lenses is the fact that their performance is strongly dependent on the polarization of incident light. When it comes to diffraction gratings, it was demonstrated that such elements can be fabricated based on PDLCs irradiated with a periodic pattern, although external electric field was required for the gratings to operate properly, as otherwise the LC within the droplets was oriented randomly [29]. Other groups reported a method of forming PDLC-based [30] and PSLCbased [31] diffraction gratings by introducing the material into LC cells with periodic in-plane-switching electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…The fabrication method was relatively simple, as it was based on selective polymer stabilization of the electrically controlled orientation of LC molecules in selected slits of each diffraction grating. As a result, stable structures with periodically variable molecular arrangements were formed and, unlike in the case of diffraction gratings based on PDLCs [29] or LC cells with periodic electrodes [21,22], no external electric field was required for them to operate. Additionally, the polymerization-induced increase in the thermal stability of the LC [6] makes the proposed fabrication technique superior to the one based on photoalignment.…”

Section: Introductionmentioning

confidence: 99%

Dual-Period Polarization-Dependent Diffraction Gratings Based on a Polymer-Stabilized Liquid Crystal

Kajkowska,

Chychłowski,

Ertman

et al. 2023

Materials

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In this paper, we demonstrate the first ever dual-period diffraction gratings that do not require electrical tuning to obtain the effect of period change. Our method allows for multiplication of the base period by proper modification of the subsequent slits of the grating. The proposed elements are fabricated by selective photopolymerization of a composite based on a nematic liquid crystal. The gratings are formed by polymer stabilization of a liquid crystal in different orientations of the molecules in selected grating slits to allow for period manipulation. The operating principle is based on changing the phase delay introduced by the slits depending on polarization direction of incident light with respect to the director in each type of slit, which allows to change the grating’s period. The proposed technique was successfully utilized to obtain diffraction gratings with either doubling or tripling of the period.

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“…Recent developments in Organic Light Emitting Diode (OLED) technology has begun to displace Liquid Crystal Displays (LCDs) from their more traditional consumer applications 11 . However, LCs are still dominant in the field of light modulation and holography 12 – 15 .…”

Section: Introductionmentioning

confidence: 99%

“…Polymer Dispersed Liquid Crystal (PDLC) is a composite material that has electrically variable light scattering properties. Its applications are varied and include smart windows 16 , variable gratings 15 , 17 , gas sensing 18 and light modulation 19 – 21 . Although PDLC devices can be produced with flexible substrates 22 – 25 , the traditional production methods and device structure restrict their geometries which limits their applications.…”

Section: Introductionmentioning

confidence: 99%

Aerosol jet printing polymer dispersed liquid crystals on highly curved optical surfaces and edges

Davies

Hobbs

Nohl

et al. 2022

Sci Rep

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We demonstrate a new technique for producing Polymer Dispersed Liquid Crystal (PDLC) devices utilising aerosol jet printing (AJP). PDLCs require two substrates to act as scaffold for the Indium Tin Oxide electrodes, which restricts the device geometries. Our approach precludes the requirement for the second substrate by printing the electrode directly onto the surface of the PDLC, which is also printed. The process has the potential to be precursory to the implementation of non-contact printing techniques for a variety of liquid crystal-based devices on non-planar substrates. We report the demonstration of direct deposition of PDLC films onto non-planar optical surfaces, including a functional device printed over the 90° edge of a prism. Scanning Electron Microscopy is used to inspect surface features of the polymer electrodes and the liquid crystal domains in the host polymer. The minimum relaxation time of the PDLC was measured at 1.3 ms with an 800 Hz, 90 V, peak-to-peak (Vpp) applied AC field. Cross-polarised transmission is reduced by up to a factor of 3.9. A transparent/scattering contrast ratio of 1.4 is reported between 0 and 140 V at 100 Hz.

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Electro-optical properties and frequency response of polymer-dispersed liquid crystal gratings doped with multi-walled carbon nanotubes

Cited by 7 publications

References 36 publications

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Dual-Period Polarization-Dependent Diffraction Gratings Based on a Polymer-Stabilized Liquid Crystal

Aerosol jet printing polymer dispersed liquid crystals on highly curved optical surfaces and edges

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