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Related Concept Videos

Vaporization01:18

Vaporization

The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...

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Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
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A Shape-Recoverable Aerogel With Lowered Surface Energy for Highly Efficient Solar Steam Generation.

Chaoyang Li1, Haifeng Wang1, Jie Xu1

  • 1State Key Laboratory of New Textile Materials and Advanced Processing, Key Laboratory for New Textile Materials and Applications of Hubei Province, School of Materials Science and Engineering, Wuhan Textile University, Wuhan, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 23, 2025
PubMed
Summary

This study developed a novel porous aerogel using hydrophobic carbon nanofibers for enhanced solar steam generation. The new material significantly boosts water vaporization efficiency for practical solar energy applications.

Keywords:
low surface energypickering emulsionporous structureshape recoverysolar vapor generation

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Porous materials are crucial for solar steam generation due to their large surface area.
  • Hydrophilic materials used in solar evaporators hinder water molecule departure due to high surface energy.
  • Incorporating hydrophobic moieties can reduce surface energy and enhance water vaporization.

Purpose of the Study:

  • To fabricate an interconnected porous aerogel with hydrophobic properties for improved solar steam generation.
  • To investigate the effect of hydrophobic carbon nanofibers on water vaporization efficiency.
  • To explore the potential for enhanced solar vapor generation through structural and surface modification.

Main Methods:

  • Fabrication of a porous aerogel using hydrophobic carbon nanofibers (CANF) via a Pickering emulsion-mediated synthesis strategy.
  • Characterization of the aerogel's porous structure and surface properties.
  • Measurement of solar steam generation rates under 1.0 sun irradiation and with external convective flow.

Main Results:

  • The fabricated aerogel exhibited plentiful pores, facilitating vapor formation and diffusion.
  • The lowered surface energy of the aerogel eased vapor detachment, boosting vaporization.
  • An ultrahigh evaporation rate of 7.573 kg m⁻² h⁻¹ was achieved under 1.0 sun.
  • An increased evaporation rate of 18.079 kg m⁻² h⁻¹ was observed with an external convective flow of 2 m s⁻¹.

Conclusions:

  • The developed hydrophobic aerogel significantly enhances solar steam generation efficiency.
  • Surface wettability adjustment and tailored porous structures are key for efficient solar vapor generation.
  • This work provides insights for designing advanced materials for real-world solar energy applications.