Veranstaltungsdetails

1.11.2011, 17:00
Jungiusstr. 11, Hörsaal AP

SFB 668 - Kolloquium

Dr. Elliot Smith (IFW Dresden):

Polymer delamination: A method for creating unique 3D microstructures

A recent advancement in microfabrication is introduced which combines rolled-up strain engineering of an inorganic ?active? layer with polymeric structures. Strain characteristics in such a system are determined by the polymer and found to be independent of the properties of the ?active? layer; thereby allowing for any number of different ?active? layers to be rolled-/coiled-up. This makes it possible to create 3D microstructures, interesting for sensoric and microrobotic applications. Furthermore, this polymer delamination technique has allowed us to create unique magnetic configurations including corkscrew-, radial- and hollow-bar-magnetized microhelix coils. Such micron-scaled structures mimic magnetic configurations of helimagnetic materials which exist naturally at the atomic scale. In order to validate experimentally the magnetic configurations of these microhelixes, we have investigated their rotational dynamics in fluid when parametrically excited with an external magnetic field. This investigation revealed rich hydrodynamics which have been further studied theoretically.