Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 2: Colloide, Nanopartikel und Kapseln

CPP 2.1: Vortrag

Montag, 24. März 2003, 10:15–10:30, ZEU/260

Polyelectrolyte shells : New ways to control capsule adhesion — •Andreas Fery, Frederic Dubreuil, Nils Elsner, and Helmuth Moehwald — Max-Planck Institut fuer Kolloide und Grenzflaechen Golm

Spherical hollow Polyelectrolyte shells can be produced with defined wall thickness between 10 nm and several 100s of nm and diameters between 100s of nm and 100 microns. By changing the thickness of the shell, its mechanical deformability can be varied. At the same time, their wetting properties are independent of the total shell thickness and can be chosen at will. This opens new perspectives for controlling the adhesion of these structures on solid substrates, because not only the surface chemistry can be used to determine the adhesive properties, but also the mechanics of the capsules can be varied over a big range.

We present data on the deformability of polyelectrolyte shells obtained from AFM force spectroscopy measurements that allows us to quantify the shells elastic properties. The impact of the mechanics on the adhesion can be studied by Reflection Interference contrast microscopy. Here we find that indeed the shell thickness can be used to vary the adhesion areas of shells over a wide range for identical interactions.