Deposition of colloid particles at heterogeneous and patterned surfaces

Area of Science:

• Surface Science and Colloid Chemistry
• Materials Science
• Physical Chemistry

Background:

• Irreversible particle adsorption (deposition) occurs on heterogeneous and patterned surfaces.
• Understanding deposition regimes is crucial for controlling surface properties.
• Existing models need validation for complex surface topographies.

Purpose of the Study:

• To review theoretical and experimental findings on particle deposition at heterogeneous and patterned surfaces.
• To assess the validity of the random sequential adsorption (RSA) model for these systems.
• To explore the application of model colloid systems for protein and macromolecule adsorption studies.

Main Methods:

• Review of theoretical results for random site surface (RSS) and patterned surface regimes.
• Application of the random sequential adsorption (RSA) approach.
• Analysis of experimental data from monodisperse latex particle adsorption on patterned surfaces.

Main Results:

• Three deposition regimes identified: quasi-continuous, RSS, and patterned.
• RSA model accurately describes particle monolayer topology, jamming coverage, and particle distribution.
• Experimental data confirm RSA model's validity for heterogeneous and patterned surfaces, including rectangular and circular features.

Conclusions:

• The random sequential adsorption (RSA) model effectively describes irreversible particle deposition on heterogeneous and patterned surfaces.
• Model colloid systems provide valuable reference states for studying protein and macromolecule adsorption.
• Experimental validation supports the theoretical predictions for various surface patterns and particle-to-site size ratios.