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DY: Fachverband Dynamik und Statistische Physik
DY 49: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)
DY 49.13: Vortrag
Donnerstag, 19. März 2020, 12:45–13:00, ZEU 255
Imbibition-Induced Deformation Dynamics in Nanoporous Media — •Juan Sanchz1, Zhuoqing Li2, Michael Froeba3, and Patrick Huber4 — 1Institute of Materials Physics, Hamburg University of Technology — 2Institute of Materials Physics, Hamburg University of Technology — 3Institute of Anorganic and Applied Chemistry, Hamburg University — 4Institute of Materials Physics, Hamburg University of Technology
We present time-dependent macroscopic dilatometry experiments on the deformation of nanoporous monoliths (carbon and silica) upon spontaneous, capillarity-driven invasion of water. We find two distinct dynamical regimes. One of them can be quantitatively traced to deformations originating in changes in the surface stress at the inner pore walls (dynamic Bangham's regime) upon water invasion, whereas the second one results from Laplace pressure effects. Our study demonstrates that it is possible to dynamically monitor imbibition dynamics by simple dilatometry measurements.