Regular Patterned Surfaces from Core-Shell Particles Preparation and Characterization

Regular Patterned Surfaces from Core-Shell Particles. Preparation and Characterization 

Abstract A simple route for fabrication of regularly patterned surfaces with specifically designed surface roughness and chemistry is reported using colloidal particles. 

The lower the surface free energy of the shell chemistry, the smaller is the contact angle hysteresis on the closely packed surface arrays. Further the contact angles varied with increasing height roughness. A possible explanation for this behaviour is that the vertical roughness influences the curvature radius of the liquid in trapped air pockets at the solid-liquid interface as was already assumed in the literature for nanostructured metal surfaces and paraffin-coated steel balls. 

Keywords Core-shell particles Modification Patterned surfaces Roughness Wettability 

The similar procedure was used to adsorb GPS onto the surfaces of silica particles. Before silanization, particles were washed 3 times in dichloromethane followed by drying in a vacuum oven at 110°C. GPS was chemisorbed from a 2% toluene solution. The particles concentration in the solution was 5 wt %. To remove non-adsorbed GPS, the particles were washed and centrifuged 6 times in toluene. 

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