(219d) Structure of Multi-Component Colloidal Lattices at Oil-Water Interfaces
AIChE Annual Meeting
2010
2010 Annual Meeting
Engineering Sciences and Fundamentals
Fundamentals of Interfacial Phenomena I
Tuesday, November 9, 2010 - 9:30am to 9:50am
Using Pickering emulsions as the experimental template, we have successfully assembled two-component S-PS/AS-PS (sulfate-treated polystyrene/aldehyde sulfate-treated polystyrene) and three-component S-PS/AS-PS/C-PS (sulfate-treated polystyrene/aldehyde sulfate-treated polystyrene/ carboxylate-treated polystyrene) colloidal lattices at poly(dimethylsiloxane)-water interfaces. The colloidal particles assemble into long-range-ordered structure and oscillate around their equilibrium positions. Different types of particles distribute randomly in the lattice with no obvious phase separation. In the two-component colloidal lattices, the S-PS particles form mostly six-fold lattice sites, whereas the AS-PS particles largely form five-fold defect sites. The calculated attractive capillary force is stronger for the AS-PS particles, which likely explains their tendency to aggregate compared to the S-PS particles. In addition, we have performed total force calculation and extrapolated the surface charge densities of the particles in the oil phase.
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