Lecture Marleen Kamperman
|19 juni 2009||FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. Marleen Kamperman|
|Affiliation:||Leibniz Institute for New Materials, Germany|
|Title:||Bioinspired systems for enhanced adhesion and catalytic functionality|
|Date:||Fri Jun 19, 2009|
|Host:||A.J. Schouten and K.U. Loos|
|Telephone:||+31 50 363 4513 / 6867|
Biological systems often exhibit excellent control and diversity in their structural design. Structural variations from the atomic scale all the way to the macroscale are tailored to create combinations of properties that are well-adapted to their purposes. As nature evolved to remarkable and complex designs, synthetic bioinspired materials are evolving towards new levels of complexity. Here two bioinspired systems tailored for enhanced adhesion and catalytic functionality will be discussed.
In the first part of this presentation a bottom-up approach to functional, porous, high temperature ceramics structured on multiple length scales is described. These materials offer great promise in high temperature catalytic applications, for their high surface area and low flow resistance in combination with thermal and chemical stability. The macroscopic structuring was obtained by a combination of micromolding and multi-component colloidal self-assembly. The resulting template was filled with a solution containing a block copolymer as a structure directing agent, along with ceramic and catalyst precursors. Heat treatment results in three-dimensionally interconnected, high temperature ceramic materials functionalized with well-dispersed 1-2 nm platinum catalyst nanoparticles and very high porosity.
In the second part bioinspired micropatterned surfaces for tunable adhesion will be discussed. Geckos, as well as flies and spiders, exhibit attachment organs with long micro and nanosized hairs, enabling these animals to firmly attach on and easily detach from almost any kind of surface. The enhanced adhesion is explained by the physical principle of contact splitting, i.e. the adhesive force increases upon splitting up one large contact into many small ones. Inspired by these systems, microstructured surfaces were developed using patterning technologies to investigate the effect of geometry on macroscopic adhesive forces and energies. These geometry-property relationships are used to guide the design of novel bioinspired artificial analogues.
|Laatst gewijzigd:||22 oktober 2012 14:30|