Phase‐Changing Sodium Carboxymethylcellulose‐As An Electrolyte for Electro‐Thermochromic Smart Window with Synergistic Optical Modulation

Smart windows are gaining attention for their exceptional ability to regulate light and heat dynamics effectively. The main objective of developing dual‐responsive smart window materials lies in enhancing building applications and optimizing energy efficiency. Materials that exhibit dual responsiven...

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Bibliographic Details
Published in:Advanced sustainable systems (Online) 2024-02, Vol.8 (2), p.n/a
Main Authors: Rathod, Pramod V., Chavan, Pooja V., Kim, Hern
Format: Article
Language:English
Subjects:
biopolymers
displays
electrochromism
smart windows
thermochromism
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Summary:Smart windows are gaining attention for their exceptional ability to regulate light and heat dynamics effectively. The main objective of developing dual‐responsive smart window materials lies in enhancing building applications and optimizing energy efficiency. Materials that exhibit dual responsiveness have already been reported in the literature. However, these materials have not garnered substantial research interest primarily due to prevailing economic and technological constraints. This study introduces a new methodology that uses a phase‐changing material as an electrolyte to design and customize smart windows based on individual preferences and requirements. In this paper, carboxymethyl cellulose sodium salt‐grafted copolymerpoly(2‐(dimethylamino) ethyl methacrylate)‐(N‐isopropylacrylamide)[CMC‐Na‐pDN] as an electrolyte and 1,1'‐Bis(2‐hydroxyethyl)‐4'4'‐dipyridinium hexafluorophosphate [HOEV] as a chromophore are synthesized and used to fabricate a gel‐based electro/thermochromic device (ETD). ETD exhibits dual‐chromism characteristics, transitioning from a colorless state to a purplehue at 25°C when 2V is applied. Furthermore, the purple color undergoes a transformation to blue coloration when the temperature exceeds 40°C. These phenomena arise due to the synergistic effect between its electrochromicreaction and thermochromic behavior. The ETD device exhibits a high optical constrast ∼82.5%, with a coloration efficiency (CE) of 333.1 cm2 C−1 and cyclic stability of >2000 cycles. In this study, a novel methodology is presented, involving the utilization of a phase‐changing material as an electrolyte to facilitate the design and customization of smart windows based on individual preferences and requirements. The device exhibits remarkable dual‐chromism characteristics, demonstrating a reversible transition from a colorless state to a purple hue at a temperature of 25 oC once 2V is applied. Furthermore, the purple color undergoes a transformation to blue coloration when the temperature exceeds 40 oC. These phenomena arise due to the synergistic effect between its electrochromic reaction and thermochromic behavior.
ISSN:2366-7486
2366-7486
DOI:10.1002/adsu.202300349