Electrohydrodynamic instabilities for smart window applications

Zhan, Yuanyuan; Han, Lu; Jin, Mingliang; Zhou, Guofu

doi:10.1080/02678292.2019.1692929

Cited by 37 publications

(29 citation statements)

References 20 publications

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“…Considerable research has already been done on "smart" windows that can switch from a transparent to a light scattering state for use in the built environment. Many different systems are under investigation, including polymer dispersed liquid crystals (PDLCs), [52][53][54] polymer stabilized liquid crystals (PSLCs), [55] electrodynamic instabilities, [56,57] and other techniques. [58][59][60] Some switchable PDLC/PSLC windows are already commercially available.…”

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

“…Electrohydrodynamic instabilities in LCs have been investigated since the 1960s, [65] and may be used to create "smart" windows by doping a nematic liquid crystal with an ionic dye, which upon application of an electrical field generate vortexes in the LC host that scatter the light: see Figure 4. [56,57] A main advantage of such a system is that it does not contain any polymer, thus removing the polymerization step and potentially increasing device lifetimes. Such devices have been shown to be capable of switching thousands of times from Reproduced with permission.…”

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

“…>95% transmission and almost no scattering to ≈10% transparent with >90% scattering. [56] Creating roughened surfaces is a common way of inducing light scattering, but this is usually not reversible. However, a "smart" window using randomly dispersed nanowires on the top of an elastomer demonstrated reversible surface deformations, forming a scattering state when a voltage was applied (see Figure 5).…”

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

“…[59] Applied to a greenhouse, the transmission of light would change throughout the day as Reproduced with permission. [56] Copyright 2019, Taylor & Francis Group. the windows would be angularly dependent, so one could conceivably tune the light distribution changes to occur for specific solar positions, presumably when the incident intensity would be highest.…”

Section: Intensity (Only) Controlmentioning

confidence: 99%

See 3 more Smart Citations

Advanced Optical Materials for Sunlight Control in Greenhouses

Timmermans

Hemming

Baeza

et al. 2020

Advanced Optical Materials

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The increasing demand for efficiently growing vegetation in greenhouses requires continual improvement of the control of the growth environment experienced by the plants. The single most important factor in maximizing the crop’s growth is the quantity, quality, and geometrical distribution of radiation intercepted at every moment. Few available greenhouse coverings are capable of responding to changes in sunlight conditions by themselves, limiting the grower’s control: they must use additional technologies, including screens, artificial lighting, heating, and cooling. This review considers existing efforts in providing adaptable greenhouse covering systems and advanced optical materials for controlling the color, intensity, and/or distribution of sunlight transmitted into greenhouse‐like structures by describing existing static materials and their responsive equivalents. This work also offers speculation on potential applications of other light‐control elements, mostly designed for use in the urban environment that can be adapted for greenhouse use in the future.

show abstract

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

Section: Intensity and Distribution Control Via Scatteringmentioning

confidence: 99%

Section: Intensity (Only) Controlmentioning

confidence: 99%

See 2 more Smart Citations

Advanced Optical Materials for Sunlight Control in Greenhouses

Timmermans

Hemming

Baeza

et al. 2020

Advanced Optical Materials

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“…It is worth mentioning that the effect of dynamic light scattering in liquid crystals was not totally abandoned. Recently, it found very promising applications in the development of dynamic shutters and smart windows [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

On the Analogy between Electrolytes and Ion-Generating Nanomaterials in Liquid Crystals

Garbovskiy

2020

Nanomaterials

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Nanomaterials in liquid crystals are a hot topic of contemporary liquid crystal research. An understanding of the possible effects of nanodopants on the properties of liquid crystals is critical for the development of novel mesogenic materials with improved functionalities. This paper focuses on the electrical behavior of contaminated nanoparticles in liquid crystals. More specifically, an analogy between electrolytes and ion-generating nanomaterials in liquid crystals is established. The physical consequences of this analogy are analyzed. Under comparable conditions, the number of ions generated by nanomaterials in liquid crystals can be substantially greater than the number of ions generated by electrolytes of similar concentration.

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Ultra‐Compliant and Tough Thermochromic Polymer for Self‐Regulated Smart Windows

Zhang

Jiang

Chen

et al. 2021

Adv Funct Materials

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Smart windows have shown powerful potential in modulating sunlight and energy management. However, there has not been a single system that can simultaneously possess all desired properties, that is, high compliance, wide tunability, and autonomous regulation. Here, a novel system based on polyhedral oligomeric silsesquioxane crosslinked poloxamer is demonstrated. The as‐synthesized material simultaneously possesses a number of the desired properties for smart windows. In addition, with the incorporation of gold nanorods, the as‐fabricated smart window can be operated in an autonomous fashion with its transmission being modulated automatically upon environmental temperature shifts. Finally, the high toughness and high stretchability (10 000% strain) of the material also pave a way for future applications in wearable displays or flexible window screens.

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Electrohydrodynamic instabilities for smart window applications

Cited by 37 publications

References 20 publications

Advanced Optical Materials for Sunlight Control in Greenhouses

Advanced Optical Materials for Sunlight Control in Greenhouses

On the Analogy between Electrolytes and Ion-Generating Nanomaterials in Liquid Crystals

Ultra‐Compliant and Tough Thermochromic Polymer for Self‐Regulated Smart Windows

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