A time-dependent expression for thixotropic areas. Application to aerosil 200 hydrogels

Area of Science:

• Rheology and Materials Science
• Colloid and Surface Chemistry

Background:

• Thixotropy describes time-dependent shear thinning behavior in complex fluids.
• Quantifying thixotropic areas, crucial for understanding structural recovery and breakdown, is experimentally difficult.
• Existing methods often struggle with accurately determining initial and fully degraded states.

Purpose of the Study:

• To develop a semi-empirical procedure for calculating hypothetical initial and fully degraded thixotropic areas.
• To derive a time-dependent expression for thixotropic areas, S(T).
• To analyze the thixotropic behavior of Aerosil 200 hydrogels at varying concentrations.

Main Methods:

• A novel semi-empirical approach to estimate key parameters for thixotropic area calculation.
• Application of the method to Aerosil 200 hydrogel systems.
• Comparative analysis using relative thixotropic areas and rates derived from S(T).

Main Results:

• Successful calculation of time-dependent thixotropic areas, S(T), for Aerosil 200 hydrogels.
• Quantitative assessment of thixotropic behavior across different hydrogel concentrations.
• Establishment of relative thixotropic areas and rates for comparative analysis.

Conclusions:

• The proposed semi-empirical procedure offers a viable method for quantifying thixotropy.
• The study provides insights into the concentration-dependent thixotropic dynamics of Aerosil 200 hydrogels.
• This approach facilitates a more thorough understanding and comparison of thixotropic systems.