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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

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Published on: March 21, 2014

Hydrated ionic polymer for thermochromic smart windows in buildings.

Huaiyuan Wang¹, Yuanwei Lu¹, Jie Wang¹

¹School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Nature Communications

|July 15, 2025

Summary

This study introduces a new thermochromic smart window that efficiently reduces building energy use. The innovative hydrated ionic polymer window achieves high light transmission and solar control, offering significant energy savings.

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Last Updated: Jul 10, 2026

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Area of Science:

Materials Science
Building Technology
Sustainable Energy

Background:

Thermochromic smart windows can reduce building energy consumption by regulating solar radiation.
Conventional smart windows often fail to balance high luminous transmittance, strong solar modulation, and optimal transition temperatures.

Purpose of the Study:

To develop a high-performance thermochromic smart window with improved energy efficiency.
To address the limitations of conventional thermochromic windows in achieving simultaneous high luminous transmittance, solar modulation, and suitable transition temperatures.

Main Methods:

Development of a hydrated ionic polymer thermochromic smart window.
Characterization of the window's thermochromic properties, including luminous transmittance and solar modulation.
Testing of durability through heating-cooling cycles and humidity exposure.
Field tests and simulations to evaluate energy-saving potential.

Main Results:

The smart window exhibits high luminous transmittance (87.7%) and significant solar modulation (30.5%).
An adjustable transition temperature range from 25°C to 42°C was achieved.
The window demonstrated excellent durability over 200 cycles and 120 days of humidity exposure.
Field tests showed indoor temperature reductions up to 10°C, with simulations predicting 11.4-17.7% energy savings.

Conclusions:

The developed hydrated ionic polymer smart window offers a high-performance solution for building energy efficiency.
This technology presents a promising strategy for reducing energy consumption and promoting global sustainability.
The window's durability and adjustable properties make it suitable for practical applications in various climates.