Tunable Surface Properties of Soft Magnetoactive Elastomers
Speaker: Irena Drevenšek-Olenik
Faculty of Mathematics and Physics
University of Ljubljana and J. Stefan Institute
Ljubljana, Slovenia
Time & Location: 10:00 Sep. 26
Lecture Hall
the 4th floor in Institue of Physics TEDA
Abstract:
Magnetoactive elastomers (MAEs) are composite materials assembled of
agnetic microparticles embedded in elastomer matrix. We performed
insitu analysis of surface topographical modifications of soft
magnetoactive elastomers in response to variable applied magnetic field.
The analysis was based on optical microscopy, spread optical reflection
and optical profilometry measurements. We found that magnetic field
induces surface roughness changes in the range of 1 µm/T. A significant
hysteresis of roughness modifications takes place for increasing an
decreasing fields. We also investigated effect of magnetic fieldinduced
modifications of contact angle of water droplets deposited on the MAE surface.
Despite increased surface roughness, the apparent contact angle decreases
with increasing field. This effect is is attributed to field-induced protrusion of hydrophilic microparticles from the surface layer.