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A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...
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Updated: Mar 25, 2026

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Water as a gas separation membrane.

Kian P Lopez1, Max Saffer-Meng1, Mohammad Allouzi2,3

  • 1Department of Chemical & Biological Engineering, University of Colorado Boulder, Boulder, CO, USA.

Nature Communications
|March 24, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel water-based membrane for efficient gas separation, mimicking plant CO2 absorption. This technology achieves high selectivity and permeance for carbon capture and hydrogen purification applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Efficient gas separation membranes are critical for carbon capture, biogas upgrading, and hydrogen purification.
  • Current membrane technologies face limitations in selectivity, permeance, and operational stability.

Purpose of the Study:

  • To develop a novel membrane platform utilizing liquid water as the selective layer for efficient gas separation.
  • To investigate the performance of water-based membranes under various conditions and gas mixtures.

Main Methods:

  • Fabrication of membranes with hydrophilic sub-100-nm pores to stabilize a thin water layer.
  • Utilizing capillary forces to maintain water layer integrity at high feed pressures (up to 72 bar).
  • Tuning gas permeance by adjusting water layer thickness and assessing selectivity based on gas solubility in water.

Main Results:

  • Achieved high CO2 permeances up to 11,600 GPU with excellent selectivities (CO2:N2=40, CO2:CH4=26, CO2:H2=31).
  • Demonstrated stable operation for over a week without water loss under dry and humid conditions.
  • Showcased scalability using commercially available porous polymer supports under mixed-gas crossflow.

Conclusions:

  • The water-based membrane platform offers a robust, high-performance, and environmentally benign solution for gas separation.
  • Dissolution-based transport mechanism avoids saturation and reaction-rate limitations, outperforming state-of-the-art membranes.
  • This technology holds significant promise for applications in carbon capture, biogas upgrading, and hydrogen purification.