Gellan-based hydrogels and microgels: A rheological perspective

Area of Science:

• Materials Science
• Biomaterials Engineering
• Chemical Engineering

Background:

• Gellan gum systems are versatile, with potential in cultural heritage for paper artwork cleaning.
• Stable microgels enhance gellan gum's cleaning efficacy, especially when functionalized (e.g., methacrylated) for hydrophobic residue removal.

Purpose of the Study:

• To characterize the rheological properties of low-acyl gellan gum hydrogels and microgels during formation.
• To assess the influence of temperature, concentration, methacrylation, cations (Na+, Ca2+), and salt concentration on rheological behavior.

Main Methods:

• Rheological characterization (viscosity, viscoelastic moduli) of gellan gum gels.
• Systematic variation of parameters including temperature, gellan concentration, and ionic environment.

Main Results:

• Gellan hydrogels and microgels exhibit a distinct double yielding behavior under conditions optimal for art restoration.
• Identified optimal rheological conditions for efficient artwork restoration using these gellan gum systems.

Conclusions:

• The study provides a thorough understanding of gellan gum gel rheology for art restoration applications.
• Optimal rheological conditions pave the way for broader applications in substrate cleaning and other fields.