Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 2: Colloide, Nanopartikel und Kapseln

CPP 2.2: Vortrag

Montag, 24. März 2003, 10:30–10:45, ZEU/260

Colloidosomes - Self Assembly of Colloidal Particles on Spherical Interfaces. — •Andreas Bausch¹, Michael Nikolaides¹, Mingh Hsu², Anthony Dinsmore³ und Dave Weitz² — ¹1Lehrstuhl fuer Biophysik E22, Technische Universitaet Muenchen, Germany — ²2Physics Department, Harvard University, Cambridge, MA, USA — ³University of Massachusetts Department of Physics, Amherst, MA, USA

The principal of self assembly is a promising technique for the production of new materials. Here we investigated the self assembly of colloidal particles at spherical oil-water interfaces using fluorescence microscopy and particle tracking. Micron-sized polymeric particles adsorbed at the surface of a water drop in oil exhibit a long-range attraction in addition to their well known electrostatic repulsion. We measure the interaction potential between the particles, and suggest a new model to explain this effect. The model is quantitatively consistent with the measured interaction potential. A similar system allows the study of the two dimensional crystallization on curved surfaces. We are able to observe the formation of additional dislocations with increasing curvature radius. Applications of these self assembly shell structures for encapsulation proposes will be discussed.