Abstract.
The cracking behavior accompanied with the drying of colloidal droplets containing polytetrafluoroethylene (PTFE) nanoparticles was studied. During evaporation, due to the stretching effect of the liquid zone, the receding wet front leads to the formation of radialized surface wrinkling in the gel zone. This indicates the building of a macroscopic stress field with a similar distribution. As a result, the cracks in the deposited films are in a radial arrangement. The propagation velocity of the cracks depends on the thickness of the film, ∼ H 3/5 . In addition, sodium dodecylsulfate (SDS) additives can be used to tune crack behavior by causing a reduction of the capillary force between particles. The results highlight the significance of the receding wet front in building the drying deposition stress field and may be helpful in other fields related to drying and cracking processes.
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Zhang, Y., Qian, Y., Liu, Z. et al. Surface wrinkling and cracking dynamics in the drying of colloidal droplets. Eur. Phys. J. E 37, 84 (2014). https://doi.org/10.1140/epje/i2014-14084-3
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DOI: https://doi.org/10.1140/epje/i2014-14084-3