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A salt-triggered multifunctional smart window derived from a dynamic polyampholyte hydrogel.

Jing Guo1, Shanshan Wu1, Yilei Wang1

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China. huixie@swjtu.edu.cn.

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|October 5, 2022
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A novel salt-triggered polyampholyte hydrogel (PAH) offers active control for smart windows. This self-healing material enables reversible transparency changes and information storage, overcoming limitations of existing smart window technologies.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Hydrogel smart windows offer light modulation via thermo-, humidity-, or electrochromic effects.
  • Existing technologies face limitations in active control, complex assembly, energy input, and susceptibility to damage.
  • Thermo- and humidity-triggered windows are passive, while electrochromic ones require intricate setups and power.

Purpose of the Study:

  • To develop a novel hydrogel smart window with active and facile actuation.
  • To introduce self-healing capabilities to hydrogel smart windows.
  • To explore information input/storage and encryption functionalities in smart windows.

Main Methods:

  • Development of a salt-triggered polyampholyte hydrogel (PAH).
  • Utilizing dynamic ionic bonds in PAH for reversible disassociation and reformation in aqueous sodium chloride solution (NaCl(aq.)) and water (H2O).
  • Patterning PAH via localized NaCl(aq.) treatment for information inscription.

Main Results:

  • PAH demonstrates reversible transparency-shifting and efficient light transmittance modulation.
  • Patterning enables one-time information input/storage, with visibility linked to transparency changes.
  • The dynamic ionic bonds provide self-healing and automatic damage-repairing abilities without compromising light modulation.

Conclusions:

  • Salt-triggered PAH offers a new approach for actively controlled hydrogel smart windows.
  • The developed material exhibits multifunctionality, including self-healing and information storage.
  • This technology presents a promising alternative to existing smart window systems, enhancing durability and user interaction.