Coupled Influence of Colloidal and Hydrodynamic Interactions on the RSA Dynamic Blocking Function for Particle...

Area of Science:

• Colloid and Surface Science
• Fluid Dynamics
• Materials Science

Background:

• Colloidal particle deposition is crucial in various industrial and environmental processes.
• Understanding interactions like electrostatic double-layer and hydrodynamic forces is key to predicting deposition behavior.
• Random Sequential Adsorption (RSA) models are often used but may not fully capture complex system dynamics.

Purpose of the Study:

• To investigate the influence of electrostatic double-layer and hydrodynamic interactions on colloidal particle deposition.
• To analyze the impact of ionic strength, particle size, and approach velocity on deposition rates.
• To determine virial coefficients for a dynamic blocking function based on RSA mechanics.

Main Methods:

• Utilized inverse analysis of colloid breakthrough data from controlled particle deposition experiments.
• Employed monodisperse latex colloids and packed glass bead columns.
• Varied ionic strength, particle size, and approach velocity in aqueous suspensions.

Main Results:

• Initial particle deposition rates and virial coefficients were determined from breakthrough data.
• Virial coefficients increased with higher flow rates and lower ionic strengths, deviating from hard sphere models.
• Larger particle sizes showed more pronounced deviations from hard sphere RSA behavior.

Conclusions:

• Electrostatic and hydrodynamic interactions significantly influence colloidal particle deposition dynamics.
• The findings highlight the limitations of simple hard sphere RSA models for complex colloidal systems.
• Particle size, flow rate, and ionic strength are critical parameters affecting deposition behavior.