A PDMS@Fe₃O₄ nanocomposite material-based solar interfacial evaporator prepared using a picosecond laser

Area of Science:

• Materials Science
• Renewable Energy
• Environmental Science

Background:

• Solar interfacial evaporation offers a sustainable solution for desalination.
• Existing evaporators suffer from high reflectivity and low water production efficiency.
• Advanced materials are needed to improve solar desalination performance.

Purpose of the Study:

• To develop a highly efficient solar evaporator using nanocomposite materials.
• To investigate the effect of surface texturing on evaporation performance.
• To assess the freshwater quality produced by the novel evaporator.

Main Methods:

• Preparation of polydimethylsiloxane (PDMS) and ferrous ferric oxide (Fe3O4) nanocomposites.
• Surface texturing of nanocomposites using picosecond laser processing.
• Characterization of surface reflectivity and measurement of evaporation rates under simulated and real solar illumination.

Main Results:

• Laser-treated PDMS@Fe3O4 surfaces exhibited reflectivity below 1% across a wide spectrum.
• The optimal PDMS to Fe3O4 mass ratio of 1.5:1 yielded the highest evaporation efficiency.
• Evaporation rates reached 9.55 kg m⁻² h⁻¹ under simulated sunlight and 1.94 kg m⁻² h⁻¹ under real sunlight.
• Produced freshwater met World Health Organization (WHO) standards for metal ion content.

Conclusions:

• Laser-textured PDMS@Fe3O4 nanocomposites are highly effective for solar interfacial evaporation.
• This technology offers a promising pathway for efficient and sustainable freshwater generation.
• The developed evaporator provides a viable solution to global freshwater scarcity.