Dynamic Surface Topographies

Accurately controlled surface topologies of (sub) micron dimensions provide a diversity of functionalities. Examples are optical functions as controlled scattering, focusing or defocusing lenses and diffraction. But also mechanical functions, such as friction and adhesion control, hydro- and aerodynamic functions as flow resistivity and mixing, and wetting/dewetting behavior also known as lotus flower effect. It is our objective to make these function adjustable, meaning that the topographies can be switched between an on and an off state.

Liquid Crystal Networks (LCNs)

Based on liquid crystal networks (LCNs) we have developed ‘smart’ coatings that can change their surface topographies under the light illumination, electricity and temperature. They can be switched “on”and “off” in a pre-designed manner.


Broer, Boven Mol, Makromol.Chem. 1989
Broer, Hikmet, & Challa, Makromol.Chem. 1989 &1991

Polysiloxane

Based on polysiloxane polymer, we have created an oscillating surface wave.

Hydrogel

We have designed approaches to create pre-determined complex deformation shapes in a swelling hydrogel.

Applications

For many of our work, we have clear applications in mind. For this purpose, we translate the microscopic surface deformation to macroscopic effects.