Monitoring the buckling threshold of drying colloidal droplets using water-ethanol mixtures.

@article{Marty2008MonitoringTB,
  title={Monitoring the buckling threshold of drying colloidal droplets using water-ethanol mixtures.},
  author={G. Marty and Nicolas Tsapis},
  journal={The European physical journal. E, Soft matter},
  year={2008},
  volume={27 2},
  pages={213-9}
}
We visualize the drying of droplets of colloids suspended in a mixture of two miscible solvents, namely water and ethanol. After a period of isotropic shrinkage, droplets suddenly buckle like elastic shells. For a fixed colloid solid fraction, the buckling threshold evolves as a function of ethanol content, due to changes of the solvent mixture physical properties, such as viscosity and evaporation rate. A simplified model predicting the qualitative behavior of the buckling threshold as a… CONTINUE READING