Enhanced Capillary Wicking through Hierarchically Porous Constructs Derived from Bijel Templates.

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Chemical Engineering

Background:

• Liquid transport through porous media is crucial for many applications.
• Hierarchically porous materials offer enhanced capillary action through dual-scale pore networks.
• Controlling both macropore and mesopore structures remains a challenge.

Purpose of the Study:

• To develop a novel method for creating hierarchically porous copper with controlled macropore and mesopore structures.
• To investigate the impact of this hierarchical structure on liquid capillarity and infiltration.
• To demonstrate the potential of this material for advanced interfacial applications.

Main Methods:

• Utilized bicontinuous interfacially jammed emulsion gels (bijels) as a template for self-assembly.
• Fabricated hierarchically porous copper structures with regular, continuous macropores and mesopores.
• Employed environmental scanning electron microscopy (ESEM) to study nanoscale morphology and liquid infiltration dynamics.

Main Results:

• Achieved unprecedented control over both macropore and mesopore arrangement in copper.
• Demonstrated significantly enhanced liquid capillarity in the hierarchically porous copper compared to homogeneous structures.
• Observed distinct wetting mechanisms: initial mesopore wetting followed by macropore transport.

Conclusions:

• Bicontinuous interfacially jammed emulsion gels (bijels) enable rational design of hierarchically porous materials.
• The hierarchical pore structure is key to enhancing capillary wicking and liquid infiltration.
• This approach offers a pathway to improved performance in battery electrodes, biomedical devices, and thermal management systems.