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Zernike Institute for Advanced Materials Colloquium Axel H.E. Mueller


04 October 2007 FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen
Axel Mueller
Axel Mueller
Speaker: Prof. Dr. Axel H.E. Mueller
Affiliation: Makromolekulare Chemie II, Universitaet Bayreuth, Germany
Title: Janus particles in 1, 2, and 3 dimensions
Date: Thu Oct 4, 2007
Start: 16.00 (Doors open and coffee available at 15.30)
Location: FWN-Building 5111.0080


New spherical, disk-like and cylindrical amphiphilic colloidal nanoparticles have been synthesized using living polymerization techniques. “Janus micelles”, i.e. surface-compartmented stars exhibiting a polystyrene and a PMMA face were made by cross-linking the center blocks of polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock copolymers in bulk. After hydrolysis of PMMA, polystyrene-poly(methacrylic acid) Janus micelles are formed which show spherical superstructures in aqueous solution, as demonstrated by DLS, cryo-TEM, and AFM. In a similar way, Janus disks and Janus cylinders are obtained as 2D and 1D structural analogs. Among other applications these particles have great potential as surfactants, in particular for emulsion polymerization.

Last modified:22 October 2012 2.30 p.m.