Seminar über aktuelle Fragen zur Dynamik komplexer Fluide: Soft matter interfaces – microscopic debonding and nanoscopic structure

Seminar über aktuelle Fragen zur Dynamik komplexer Fluide

  • Date: Dec 1, 2017
  • Time: 10:15 AM - 11:15 AM (Local Time Germany)
  • Speaker: Dr. Julia Nase
  • TU Dortmund
  • Location: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Room: SR 0.77
  • Host: MPIDS/DCF
  • Contact:
Bonding and debonding phenomena are very present in everyday life – for example when you find chewing gum stuck to your shoe, or when the conference posters do not stick reliably to the wall. In the first part of my talk, I will give insight into debonding phenomena on the micrometer scale. How can debonding happen? And what role plays structure formation? The probe tack test is a simple approach to tackle these questions.
In the second part of my talk, I will focus on processes at interfaces on a molecular level. Hydrophobic interfaces play an important role in nature. The folding process of proteins is vastly governed by hydrophobic interactions, and the structure of cell membranes, consisting of amphiphilic lipid molecules, is controlled by hydrophobic/hydrophilic forces. Naturally, biological structures exist in water. Exposing hydrophobic solid/water interfaces to increased hydrostatic pressure, we demonstrated in X-ray reflectivity experiments that the compressibilities of interfacial and bulk water differ. In nature, living organisms are experiencing high pressure in a deep sea environment. The understanding of biological membranes and functionalities at such extreme conditions remains incomplete. We studied thus the reaction of model membranes towards pressure stress.

J. Nase et al, Pattern formation during deformation of a confined viscoelastic layer: From a viscous liquid to a soft elastic solid, Phys. Rev. Lett. 101 (2008) 074503
J. Nase et al, Measurement of the receding contact angle at the interface between a viscoelastic material and a rigid surface, Soft Matter 6 (2010) 2685
F.J. Wirkert et al, X-ray reflectivity measurements of liquid/solid interfaces under high hydrostatic pressure, J. Synchrotron Radiat 21 (2014) 76
B. Nowak et al, Solid supported lipid multilayers under high hydrostatic pressure, Langmuir 32 (2016) 2638
F.J. Wirkert et al The hydrophobic gap at high hydrostatic pressures, Ange. Chem. Int. Ed. 56 (2017) 12958–12961
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