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Watching paint dry: Evaporation mediated self-assembly of nanoparticles

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If you have a question about this talk, please contact Dr C. P. Caulfield.

When a stable colloidal dispersion dries a number of remarkable transformations occur. The first observation is that drying is non-uniform with fronts of close packed particles passing laterally across films. This lateral drying results in fluid flow through consolidated particles and a non-uniform capillary pressure across the film. Cracks can form because of this capillary pressure and these follow the drying fronts with a characteristic staircase like progression. In certain circumstances the cracks are seen to oscillate. In addition any surfactant non-uniformities result in Marangoni instabilities and a characteristic set of islands in the film topography. This talk will describe the drying process and show where we are in understanding the many stages that can occur.

This talk is part of the Fluid Mechanics (DAMTP) series.

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