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Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

Solid–Solid Solutions

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.

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Liquid Metal-Polyphenol Hybrids for Solar Steam Generation.

Nieves Flores¹, Franco Centurion², Md Hasan Al Banna¹

¹School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW, 2006, Australia.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 13, 2025

Summary

A new gel composite using natural polyphenols, liquid gallium, and graphene boosts solar steam generation for efficient water desalination. This innovation offers a sustainable solution to global freshwater scarcity.

Keywords:

MPNs desalination gallium graphene liquid metal metal‐phenolic gel solar steam generation

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Area of Science:

Materials Science
Nanotechnology
Environmental Science

Background:

Interfacial solar steam generation is key for sustainable water desalination.
High efficiency under real-world conditions remains a challenge.

Purpose of the Study:

To develop a high-performance solar-driven desalination system.
To engineer a natural polyphenol-based gel composite with liquid gallium and graphene.

Main Methods:

Fabrication of a multifunctional gel composite.
Integration of liquid gallium particles and graphene within a polyphenol gel matrix.
Characterization of light absorption, heat localization, and water transport properties.

Main Results:

The composite demonstrated broadband light absorption and enhanced solar-to-heat conversion.
Liquid gallium localized heat, while the gel facilitated water retention and vapor escape.
Achieved evaporation rates of 4.8 kg m⁻² h⁻¹ for deionized water and 3.4 kg m⁻² h⁻¹ for seawater under one sun irradiation.

Conclusions:

The synergistic combination of materials enhances solar steam generation efficiency.
This gel composite shows significant potential for scalable and energy-efficient desalination.
The technology addresses global freshwater scarcity by providing a sustainable water source.