Wetting, flow & pH

This project studies molecular processes in dynamic wetting, including how they affect larger scales and interface with continuum models. Although wetting is a phenomenon that can be observed by eye at the macroscale, processes at the molecular scale can play an important role, especially at the three-phase contact line, where solid, liquid and gas meet. Here displacements of small groups of molecules determine how fast the contact line, and thereby the wetting advances. Molecular dynamics is a powerful tool to study these processes. Information obtained at the molecular scale can then transferred to model at larger scale in a multi-scale modeling framework. Current work projects concern fundamentals of contact line motion of water on hydrophilic substrates, electrowetting and wetting on rough surfaces.

There is an opening for a PhD-student on assembly of biomolecules using pH in flow.


Recent Publications:

  • Johansson, P. and Hess, B., Electrowetting diminishes contact line friction in molecular wetting, Physical Review Fluids (2020), 5, 064203. doi:10.1103/PhysRevFluids.5.064203
  • Johansson, P. and Hess, B., Molecular origin of contact line friction in dynamic wetting, Physical Review Fluids (2018), 3, 074201. doi:10.1103/PhysRevFluids.3.074201
  •  Johansson, P., Carlson, A. and Hess, B., Water–substrate physico-chemistry in wetting dynamics, Journal of Fluid Mechanics (2015), 781, 695-711. doi:10.1017/jfm.2015.517