Dichroic-dye-doped short pitch cholesteric liquid crystals for the application of electrically switchable smart windows

Baliyan, Vijay Kumar; Jeong, Kwang‐Un; Kang, Shin‐Woong

doi:10.1016/j.dyepig.2019.03.045

Cited by 51 publications

(16 citation statements)

References 24 publications

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“…The smart window becomes darker and reflects more light upon heating, and its transmission decreases. Many strategies have been tested in the development of LC based smart windows. − …”

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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“…The smart window becomes darker and reflects more light upon heating, and its transmission decreases. Many strategies have been tested in the development of LC based smart windows. − …”

Section: Liquid Crystal Based Smart Windowsmentioning

confidence: 99%

Liquid Crystals: Versatile Self-Organized Smart Soft Materials

2021

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“…Previous findings reveal that the arrangement of helical LCs is sensitive to both the strength and the frequency of an applied electric field, thereby indicating a possible pathway to binary responsiveness, which is commonly unattainable with any other stimuli, regardless of temperature, light, and mechanical force 7 . Generally, when the electiric field is increased, the uniformly oriented helical LCs with selective-reflection oily streaked texture are disrupted and transform to a transparent fingerprint or light-scattered focal conic texture, and even a vertical aligned unwind state, since the bend elastic constant K 33 is larger than the twist elastic constant K 22 in a common chiral system 17 – 20 . Such a transition can also be achieved by adjusting the frequency of an applied electric field in some specific series of LCs.…”

Section: Introductionmentioning

confidence: 99%

Dynamically actuated soft heliconical architecture via frequency of electric fields

Liu

Yuan

et al. 2022

Nat Commun

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Dynamic electric field frequency actuated helical and spiral structures enable a plethora of attributes for advanced photonics and engineering in the contemporary era. Nevertheless, leveraging the frequency responsiveness of adaptive devices and systems within a broad dynamic range and maintaining restrained high-frequency induced heating remain challenging. Herein, we establish a frequency-actuated heliconical soft architecture that is quite distinct from that of common frequency-responsive soft materials. We achieve reversible modulation of the photonic bandgap in a wide spectral range by delicately coupling the frequency-dependent thermal effect, field-induced dielectric torque and elastic equilibrium. Furthermore, an information encoder prototype without the aid of complicated algorithm design is established to analogize an information encoding and decoding process with a more convenient and less costly way. A technique for taming and tailoring the distribution of the pitch length is exploited and embodied in a prototype of a spatially controlled soft photonic cavity and laser emission. This work demonstrates a distinct frequency responsiveness in a heliconical soft system, which may not merely inspire the interest in field-assisted bottom-up molecular engineering of soft matter but also facilitate the practicality of adaptive photonics.

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“…11 Even indoors, UV radiation can still cause harm to humans through windows, so regulating UV radiation through windows is a good solution. 12,13 Carbon dots (CDs) are a new type of carbon nanomaterial with a unique structure that has excellent absorption of UV light. [14][15][16][17][18] The application of CDs to windows can well solve the indoor problem of ultraviolet radiation.…”

Section: Introductionmentioning

confidence: 99%