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Updated: Aug 13, 2025

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

Published on: February 28, 2014

Boosting Evaporative Cooling Performance with Microporous Aerogel.

Huajie Tang¹, Chenyue Guo¹, Qihao Xu¹

¹School of Energy and Environment, Southeast University, Nanjing 210096, China.

|January 21, 2023

Summary

This study introduces a bilayer hydrogel-aerogel structure for enhanced evaporative cooling. The innovative design significantly extends cooling duration, offering a promising solution for thermal regulation.

Keywords:

evaporative cooling hydrogel layer microporous aerogel layer radiative cooling

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Last Updated: Aug 13, 2025

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

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Published on: February 28, 2014

Preparation of Biopolymer Aerogels Using Green Solvents

Preparation of Biopolymer Aerogels Using Green Solvents

Published on: July 4, 2016

Aesthetically Enhanced Silica Aerogel Via Incorporation of Laser Etching and Dyes

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Published on: March 12, 2021

Area of Science:

Materials Science
Thermal Engineering
Sustainable Technologies

Background:

Hydrogel-based evaporative cooling offers low-carbon thermal regulation but suffers from limited cooling duration due to regeneration/evaporation mismatch, particularly in arid climates.
Existing hydrogel cooling systems face challenges in maintaining efficiency throughout the day, limiting their practical application.

Purpose of the Study:

To enhance the cooling performance and extend the cooling time span of hydrogel-based evaporative cooling systems.
To develop an efficient bilayer structure combining hydrogel and aerogel for improved thermal regulation.

Main Methods:

A bilayer structure comprising a bottom hydrogel layer and an upper aerogel layer was designed and fabricated.
The microstructure of the porous aerogel was optimized for radiative cooling and vapor transfer using a cooling performance model.
The thermal performance of the bilayer structure was evaluated and compared to a single hydrogel layer.

Main Results:

The proposed bilayer structure effectively reduces saturation vapor density at the hydrogel surface through radiative cooling and increases convective heat transfer resistance.
A 2-mm-thick SiO₂ aerogel layer in the bilayer structure extended the evaporative cooling time span by 11 times.
The bilayer structure achieved a temperature reduction of 1.4 °C compared to ambient conditions.

Conclusions:

The integration of an aerogel layer with a hydrogel significantly boosts evaporative cooling performance and extends the cooling duration.
This bilayer approach presents a viable strategy for improving the efficiency and applicability of hydrogel-based cooling technologies, especially in challenging environments.