Reverse mode polymer stabilized cholesteric texture (PSCT) light shutter display – A short review

Ahmad, Farzana Kabir; Jamil, M.; Jeon, Young Jae

doi:10.1016/j.molliq.2017.03.011

Cited by 27 publications

(10 citation statements)

References 19 publications

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“…There is an ever-increasing interest in the development of smart windows using different kinds of materials and operating under different conditions. − The responsive and adaptive properties of LCs have been exploited in the development of smart switchable windows. − These LC based windows regulate the transmission of light and heat into and out of the built environment. This control of light and heat flow saves energy, which is necessary to keep the environment warm or cold.…”

Section: Liquid Crystal Based Smart Windowsmentioning

confidence: 99%

Liquid Crystals: Versatile Self-Organized Smart Soft Materials

2021

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Smart soft materials are envisioned to be the building blocks of the next generation of advanced devices and digitally augmented technologies. In this context, liquid crystals (LCs) owing to their responsive and adaptive attributes could serve as promising smart soft materials. LCs played a critical role in revolutionizing the information display industry in the 20th century. However, in the turn of the 21st century, numerous beyond-display applications of LCs have been demonstrated, which elegantly exploit their controllable stimuli-responsive and adaptive characteristics. For these applications, new LC materials have been rationally designed and developed. In this Review, we present the recent developments in light driven chiral LCs, i.e., cholesteric and blue phases, LC based smart windows that control the entrance of heat and light from outdoor to the interior of buildings and built environments depending on the weather conditions, LC elastomers for bioinspired, biological, and actuator applications, LC based biosensors for detection of proteins, nucleic acids, and viruses, LC based porous membranes for the separation of ions, molecules, and microbes, living LCs, and LCs under macro- and nanoscopic confinement. The Review concludes with a summary and perspectives on the challenges and opportunities for LCs as smart soft materials. This Review is anticipated to stimulate eclectic ideas toward the implementation of the nature’s delicate phase of matter in future generations of smart and augmented devices and beyond.

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Section: Liquid Crystal Based Smart Windowsmentioning

confidence: 99%

Liquid Crystals: Versatile Self-Organized Smart Soft Materials

2021

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“…[ 1–5 ] There are a few types of switchable windows, such as suspended particles, [ 6 ] electrochromics, [ 7–9 ] and liquid crystals (LCs). [ 10–26 ] Most of them use electricity to control the state of the windows. The usage of electricity for controlling consumes energy and, thus, is not the best way to switch the windows.…”

Section: Introductionmentioning

confidence: 99%

Smart Thermally Switchable Liquid Crystal Window

Jiang

Zhou

Wang

et al. 2021

Advanced Photonics Research

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Global warming, due to the consumption of fossil energy, is one of the biggest challenges in recent days. Air conditioning (cooling and heating) of office and residential buildings is one of the largest energy consumptions. One way to reduce the energy consumption is to use switchable architectural windows, which can control radiant energy flow. Herein, a smart thermally switchable window with transmittance sensitive to ambient temperature is reported. This smart window is based on a liquid crystal (LC) whose orientation varies with temperature. At temperatures lower than a low threshold temperature, such as in winter, the LC orients perpendicular to the window substrate, and the window is transparent and lets sunlight pass it to warm interiors of buildings. At temperatures higher than a high threshold temperature, such as in summer, the LC orients parallel to the substrate. The window becomes absorbing and blocks sunlight, resulting in a reduction of the solar heating. When temperature varies between these two thresholds, the window has gray‐level transmittances. It does not use electricity and is very energy‐saving, and has an immense potential in applications of smart architectural and vehicle windows.

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“…The key alignments of LCs are homogeneous, homeotropic, and hybrid, which are being utilized for various electrooptic (EO) applications of LC in order to execute the purpose. In recent years, these EO materials based on polymer dispersed liquid crystals (PDLCs) are found advanced with their working operation in reverse mode with homeotropic alignment (HA) of LCs . In reverse mode, PDLCs follow the mechanism of initial transmission of light owing to the homeotropically aligned LCs, whereas electrically tunable scattering of light deals with the transparent to opaque state of the PDLC film.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

Sharma

Kumar

Chinky

et al. 2019

J of Applied Polymer Sci

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Reported herein, the preparation, morphological, and electrooptic (EO) characterization of reverse mode polymer dispersed liquid crystals (PDLCs) with nematic liquid crystal (LC) and UV curable polymer optical adhesive using polymerization induced phase separation method. The PDLCs are switchable between transparent and opaque states due to the homeotropic and planar alignment of LC in their OFF and ON states of applied voltage, respectively. Further, effect of doping of a fixed concentration of azo dye and silica nanoparticles (NPs) on morphological, EO and response characteristics of same PDLC sample was also analyzed. Experimental results showed that doped reverse mode PDLCs have the higher OFF state optical transmission and boost up in the scattering ON state compared with pristine reverse mode PDLC. The phenomenon is also supported by extinction coefficient and absorption study based on Beer's law. The threshold and operating voltages were found reduced ~1.56 and ~1.73 times for NPs and (NPs + dye) doped reverse mode PDLCs, respectively, along with better contrasts to the pristine reverse mode PDLC. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48745.

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Reverse mode polymer stabilized cholesteric texture (PSCT) light shutter display – A short review

Cited by 27 publications

References 19 publications

Liquid Crystals: Versatile Self-Organized Smart Soft Materials

Liquid Crystals: Versatile Self-Organized Smart Soft Materials

Smart Thermally Switchable Liquid Crystal Window

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

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