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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Electrochromic Device Demonstrator from Household Materials.

Martin Rozman^1,2,3, Mojca Alif⁴, Urban Bren²

¹Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Študentská 2, SK-91150 Trenčín, Slovakia.

Journal of Chemical Education

|October 17, 2022

Summary

This summary is machine-generated.

This study presents a simple method to create electrochromic devices (ECDs) using household items like kitchen knives and turmeric. This approach makes learning about electrochemistry and electrochromism accessible without expensive materials.

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Area of Science:

Electrochemistry
Materials Science
Chemical Education

Background:

Electrochromism involves reversible optical property changes in materials under electrical stimulus, crucial for low-power smart devices.
Conventional electrochromic devices (ECDs) often rely on complex chemicals, advanced material preparation, and costly components like optically transparent electrodes (OTEs).
Existing educational demonstrations of electrochromism typically utilize expensive materials such as WO3 films, conductive polymers, or OTEs, limiting accessibility in standard laboratory settings.

Purpose of the Study:

To introduce a simplified, rapid, and cost-effective educational method for constructing electrochromic devices (ECDs).
To demonstrate electrochromism using readily available household materials, eliminating the need for specialized equipment like OTEs.
To enhance student understanding of fundamental electrochemical principles and the phenomenon of electrochromism through hands-on experimentation.

Main Methods:

Utilized unsharpened kitchen knives as electrodes for the electrochromic devices.
Employed curcumin, extracted from turmeric, as the primary electrochromic dye.
Incorporated a baking soda solution as the electrolyte to facilitate the electrochemical reactions.

Main Results:

Successfully constructed functional electrochromic devices using common household materials.
Observed distinct color changes in curcumin, demonstrating the electrochromic effect.
The experiments facilitated a practical understanding of electrolysis and pH-induced color changes in curcumin due to keto-enol tautomerism.

Conclusions:

The presented method offers an accessible and economical approach to teaching electrochemistry and electrochromism.
Household materials can be effectively utilized to demonstrate complex scientific phenomena, fostering greater student engagement.
This educational strategy demystifies electrochromic device fabrication and fundamental electrochemical concepts.