Control of solar insolation via thermochromic light-switching gels

Beck, Andreas; Körner, Werner; Scheller, Heinrich; Fricke, J.; Platzer, Werner; Wittwer, V.

doi:10.1016/0927-0248(94)00171-n

Cited by 20 publications

(6 citation statements)

References 3 publications

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“…Here, the thermotropic gel is based on poly(methyl vinyl ether) crosslinked with methylene-bis-acrylamide. By varying the composition of the gel, the switching temperature can be adjusted between 10 °C and 65 °C [ 33 ]. The visible normal-hemispherical transmittance of a 1 mm thick layer changes from 92% to 6% at 25 °C and 50 °C, respectively.…”

Section: Thermotropic Systemsmentioning

confidence: 99%

Thermotropic and Thermochromic Polymer Based Materials for Adaptive Solar Control

2010

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The aim of this review is to present the actual status of development in adaptive solar control by use of thermotropic and organic thermochromic materials. Such materials are suitable for application in smart windows. In detail polymer blends, hydrogels, resins, and thermoplastic films with a reversible temperature-dependent switching behavior are described. A comparative evaluation of the concepts for these energy efficient materials is given as well. Furthermore, the change of strategy from ordinary shadow systems to intrinsic solar energy reflection materials based on phase transition components and a first remark about their realization is reported. Own current results concerning extruded films and high thermally stable casting resins with thermotropic properties make a significant contribution to this field.

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Section: Thermotropic Systemsmentioning

confidence: 99%

Thermotropic and Thermochromic Polymer Based Materials for Adaptive Solar Control

2010

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“…15 By autonomously and reversibly decreasing solar radiation in buildings at high temperatures, energy spent on building cooling is reduced. Polymeric materials used for thermoresponsive glazing include polymer blends, 16,17 hydrogels, [18][19][20][21] and polymer-dispersed liquid crystal films. [22][23][24][25] The concept to use an LCST phase transition as a light reflector gate to prevent overheating, is also used in solar collectors.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive icy road sign by light scattering and enhanced fluorescence

et al. 2021

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“…7 By autonomously and reversibly decreasing solar radiation in buildings at high temperatures, energy spent on building cooling is reduced. Polymeric materials used for thermotropic glazing include polymer blends, 8,9 hydrogels, [10][11][12][13] and polymerdispersed liquid crystal films [14][15][16][17] The concept to use an LCST phase transition as a light reflector gate to prevent overheating, is also used in solar collectors. 18 Research into LCST-type polymer solutions and gels has been especially extensive for aqueous systems, 19,20 with many thermotropic applications being used for reactive glazing.…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Icy Road Sign with Light Scattering and Fluorescence Response

Booth¹,

Young²,

Gonzales³

et al. 2021

Preprint

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<div> <div> <div> <p>Prototypes of flexible, electricity-free, ice warning signs for roads and pavements have been developed. A thermotropic response in the form of an upper critical solution (UCST) type phase separation targeted near the freezing point of water manifests itself through light scattering as a clear-to-opaque transition. It is simultaneously amplified by an enhanced photoluminescence effect. The conceptual road sign application is a multi-lamellar flexible strip with an active layer of a polystyrene-based solution. The solvent is a plasticizer, here either dioctylphthalate (DOP) or its alternative 1,2-cyclohexane dicarboxylic acid diisononyl ester (DINCH). A collection of styrene-based macromolecules were made by free radical (co)polymerization, varying molecular weight and monomer feed composition. UCST type phase diagrams for the polymer solutions were constructed from cloud point data measured by a bespoke photographic set-up, in which up to 30 samples were measured simultaneously using both light scattering, that is opacity, and fluorescence. For the latter, the concept of restricted motion enhanced photoluminescence, often referred to as aggregation-induced emission (AIE), was used. Polystyrene labelled with tetraphenylethylene (TPE) was used for this. The contrast between ‘ON’ and ‘OFF’ states in the prototype ice warning signs was optimized by tuning the polymer concentration and the active layer thickness. Our prototype signs show full reversibility over many temperature cycles. We believe the concept can be of wider use in electricity-free signs and labels. </p> </div> </div> </div>

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Control of solar insolation via thermochromic light-switching gels

Cited by 20 publications

References 3 publications

Thermotropic and Thermochromic Polymer Based Materials for Adaptive Solar Control

Thermotropic and Thermochromic Polymer Based Materials for Adaptive Solar Control

Thermoresponsive icy road sign by light scattering and enhanced fluorescence

Thermotropic Icy Road Sign with Light Scattering and Fluorescence Response

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