An Experimental Study of the Kinetics of Particle Deposition in a Wall-Jet Cell Using Total Internal Reflection...

Area of Science:

• Colloid and Surface Science
• Chemical Engineering
• Materials Science

Background:

• Understanding particle deposition is crucial for processes like filtration and coating.
• Polystyrene latex particles are common model systems in scientific research.

Purpose of the Study:

• To investigate the in situ deposition kinetics of polystyrene latex particles.
• To elucidate the relationship between particle deposition rate and fluid dynamics.
• To develop a predictive model for particle deposition.

Main Methods:

• In situ monitoring of 0.46 µm polystyrene latex particle deposition.
• Utilized a wall-jet cell and total internal reflection microscopy.
• Experimentation conducted on an indium tin oxide surface under laminar flow conditions for up to 13 hours.

Main Results:

• Initial particle flux was mass-transfer-controlled.
• Deposition rate exhibited a first-order time-dependent behavior.
• Effective particle transfer coefficient showed an inverse correlation with wall shear rate.
• Concentration dependency followed a Langmuir-type pseudoisotherm.

Conclusions:

• A model equation incorporating three empirical constants, including a mass transfer coefficient, effectively described the overall deposition process.
• The findings provide insights into the mechanisms governing particle adhesion and transport.
• This research contributes to the fundamental understanding of colloidal particle behavior in flow systems.