Time Resolved Imaging of Evaporative Thinning of Liquid Films on Planar Solid Substrates

  • Date: Aug 25, 2017
  • Time: 10:15 AM - 11:15 AM (Local Time Germany)
  • Speaker: Stephan Eickelmann
  • MPI of Colloids and Interfaces, Potsdam
  • Location: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Room: SR 0.77
  • Host: DCF
  • Contact: stefan.karpitschka@ds.mpg.de
We investigate the thinning behaviour of ultrathin films of evaporating liquids on planar solid substrates. The liquids consist of mixtures with at least one volatile component [1].
(I) For mixtures of a volatile solvent and a nonvolatile solute we study how the precipitation of the solute influences the wetting properties of the liquid film [2].
(II) For mixtures of two different volatile liquids we show how films can become unstable even if both components are individually completely wetting the substrate [3].
(III) Under certain conditions nanoparticles embedded in thin films of volatile liquids can be located using conventional optical microscopy [4-5] even if the particles are much smaller than the optical resolution limit.

[1] S. Karpitschka, C Weber, and H. Riegler, "Spin casting of dilute solutions: Vertical composition profile during hydrodynamic-evaporative film thinning.“ Chem. Eng. Sci. 129, 243 (2015)
[2] S. Eickelmann and H. Riegler “Dewetting of ultrathin solvent films on planar solid substrates induced by solute precipitation” to be submitted
[3] S. Karpitschka, F. Liebig, and H Riegler „Marangoni Contraction of Evaporating Sessile Droplets of Binary Mixtures” Langmuir, 33(19), 4682-4687 (2017)
[4] S. Eickelmann, G. Chen, J. Danglad Flores, and H. Riegler “Enhanced Optical Visualization of Nano Size Objects Through Thin Film Surface Distortion” to be submitted
[5] Y. Hennequin, et al., "Optical detection and sizing of single nanoparticles using continuous wetting films.“ ACS Nano, 7 (9), 7601 (2013)
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