Freitag vormittags Vorträge - Bunsentagung - Technische Universität ...

Freitag 21.05.2004, 17:50 Uhr
Vortrag - Hauptthema
A
11
Self Assembly of Polyelectrolyte Capsules on
Patterned Surfaces
Marc Nolte, , Andreas Fery
Max-Planck-Institut für Kolloid und Grenzflächenforschung,
14424 Potsdam, Germany
It has been shown that many materials ranging from polymer
solutions up to whole living cells can be encapsulated in polyelectrolyte
multilayers. Thus these systems are promising for
applications as micron sized sensors, or even as micron sized
chemical reactors. A key step towards integrating polyelectrolyte
capsules in chips or producing arrays of capsules that can
be addressed individually is to control their immobilization on
flat surfaces. In previous work, we have found that the capsules
adhere strongly onto surfaces of opposite surface charge, while
adhesion is blocked on surfaces of the same charge (Elsner
et al., 2003). We use this property to direct the adhesion of the
capsules on flat surfaces: In a first step, the surface charge of the
substrate is patterned by microcontact printing, creating regions
of positive and negative surface charge. Subsequently the capsules
are incubated with the surface and spontaneously adhere
to the desired regions. Thus even individual capsules can be immobilized
and are thus addressable (Nolte and Fery, 2003).
Elsner, N., Dubreuil, F. and Fery, A. (2003) submitted.
Nolte, M. and Fery, A. (2003) IEEE Transactions on Nanobioscience,
in press.