Interpenetrating Janus Membrane for High Rectification Ratio Liquid Unidirectional Penetration

Area of Science:

• Materials Science
• Physical Chemistry
• Chemical Engineering

Background:

• Anisotropic interfaces with opposing properties exhibit unique physicochemical behaviors.
• These properties are crucial in various scientific and technological applications.
• Understanding the mechanisms behind anisotropic phenomena is key for developing advanced materials.

Purpose of the Study:

• To design and investigate an anisotropic Janus membrane with dual wettability.
• To explore the unidirectional liquid penetration capabilities of this membrane.
• To elucidate the roles of both anisotropic wettability and interpenetrating microstructure in this phenomenon.

Main Methods:

• Rational design of an anisotropic Janus membrane.
• Fabrication of a membrane with opposite wettability and interpenetrating interface microstructure.
• Theoretical analysis of liquid penetration dynamics.
• Experimental validation of unidirectional liquid transport.

Main Results:

• The designed Janus membrane demonstrated a unidirectional liquid penetration "diode" performance.
• Liquid successfully penetrated from the lyophobic to the lyophilic direction.
• The reverse flow from lyophilic to lyophobic direction was effectively blocked.
• Both anisotropic wettability and the unique interpenetrating topology were identified as critical factors.

Conclusions:

• The study reveals that interpenetrating microstructure significantly contributes to unidirectional liquid penetration, alongside anisotropic wettability.
• This provides a general strategy for creating Janus membranes with high hydraulic pressure rectification ratios.
• The developed liquid diode Janus membrane holds potential for applications in liquid manipulation, smart separation, and functional textiles.