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

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WanneerWaar
04 oktober 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

Abstract

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.

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Laatst gewijzigd:22 oktober 2012 14:30