Imbibition on a porous layer: dynamical and mechanical characterization.

Area of Science:

• Materials Science
• Physics of Porous Media
• Rheology

Background:

• Understanding solvent penetration in porous materials is vital for applications like conservation and manufacturing.
• Previous studies often lack detailed analysis of the dynamic and mechanical interplay during solvent imbibition.

Purpose of the Study:

• To analyze solvent penetration dynamics and mechanical changes in porous layers.
• To identify universal behaviors and characteristic times governing solvent imbibition.
• To investigate the role of solvent penetration in altering material properties.

Main Methods:

• Dynamic analysis of solvent drop spreading on porous substrates.
• Mechanical characterization using indentation testing during imbibition.
• Direct visualization of drop and wet zone evolution.

Main Results:

• Identified three distinct regimes of solvent imbibition.
• Demonstrated universal behavior across various porous systems and solvents.
• Showed that solvent penetration introduces a viscous component, with a characteristic time dependent on solvent and substrate.
• Observed recovery of initial mechanical properties without swelling or cracking.

Conclusions:

• Solvent penetration significantly influences the mechanical properties of porous materials.
• The absence of swelling or cracking suggests that visco-plastic properties are necessary for these phenomena.
• The findings provide insights into material conservation and the design of porous systems.