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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

Contact: Jana Husse

+49 761 203 678 34
softmattergraduate[at]uni-freiburg.de


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You are here: Home Events Dr. Hans Riegler "Nanoaggregates, bubbles, droplets, and thin films: The influence of interfacial energies in confined systems"

Dr. Hans Riegler "Nanoaggregates, bubbles, droplets, and thin films: The influence of interfacial energies in confined systems"

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MPI for Colloids and Interfaces, Am Mühlenberg, D-14476 Potsdam, Germany

What
  • Seminar
When Dec 04, 2015
from 02:15 PM to 03:00 PM
Where Hörsaal 2, Physikalisches Institut, Hermann-Herder-Str. 3, Freiburg
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In the case of confined (small) systems interfacial energies can contribute significantly to the overall system energy and thus affect or even dominate the system behavior. Well-known examples for these cases are nucleation and growth processes or the wetting/dewetting behaviour of thin films. We will present and analyze new experimental results on the nucleation and growth of aggregates of C60 (fullerenes) on nanostructured planar substrates and on the bubble formation initiated by an individual, localized nano size active nucleation site (a platinum nanoparticle catalyzing O2 from a H2O2 solution). In the context of the nucleation/precipitation studies we will analyze shortly the physics of spin casting as one of our main experimental techniques. With macroscopic sessile droplets we will analyze how local surface tension gradients and the resulting surface (Marangoni) flows affect the evaporation of individual droplets and the drop/drop-coalescence behavior including cases with reacting liquids.

[1] S. Karpitschka, C.M. Weber, and H. Riegler, Spin casting of dilute solutions: Vertical composition profile during hydrodynamic-evaporative film thinning, Chemical Engineering Science, 129, 243–248 (2015).
[2] F. Ghani, H. Gojzewski, and H. Riegler, Nucleation and growth of copper phtalocyanine aggregates deposited from solution on planar surfaces, Applied Surface Science, 351, 969–976 (2015).
[3] M. Jehannin, S. Charton, S. Karpitschka, T. Zemb, H. Mhwald, and H. Riegler, Periodic Precipitation Patterns during Coalescence of Reacting Sessile Droplets, Langmuir, 31, 11484–11490 (2015).
[4] V. Soulie, S. Karpitschka, F. Lequien, P. Prene, T. Zemb, H. Mhwald, and H. Riegler, Teh evaporation behavior of sessile droplets from aqueous saline solutions, Phys. Chem. Chem. Phys., 17, 22296–22303 (2015).
[5] S. Karpitschka and H. Riegler, Quantitative Experimental Study on the Transition between Fast and Delayed Coalescence of Sessile Droplets with Different but Completely Miscible Liquids, Langmuir, 26, 11823–11829 (2010).)
[6] S. Karpitschka and H. Riegler, Noncoalescence of Sessile Drops from Different but Miscible Liquids: Hydrodynamic Analysis of the Twin Drop Contour as a Self-Stabilizing Traveling Wave, Phys. Rev. Lett, 109, 066103 (2012).
[7] S. Karpitschka and H. Riegler, Sharp Transition between Coalescence and Noncoalescence of Sessile Drops: Interplay between Marangoni Flow and Local Topography, J. Fluid Mech. 743, R1 (2014)
[8] S. Karpitschka, C. Hanske, A. Fery, and H. Riegler, Coalescence and Noncoalescence of Sessile Drops: Impact of Surface Forces, Langmuir, 30, 6826–6830 (2014).

 

invited by Dr. Renate Reiter

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