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30-6-2009: Publication in PNAS: Melting and crystallization of colloidal hard-sphere suspensions under shear Observations were made of a concentrated suspension of colloids undergoing shear. This is made possible by an advanced, home-built shear cell placed on a confocal microscope. A low shear rates we find that the order among the particles will gradually increase until a colloidal crystal is formed. At higher shear rates the crystal will shear melt again. However, the order shows very large fluctuations. Apparently, the crystal is never completely melted, but ordered domains keep appearing now and then.
11-2-2007: Towards a photonic band gap for visible light We have discovered a route by which crystals having a complete photonic band gap in the visible could be self-assembled from colloids. It makes use of the MgCu2 Laves phase, which consists of two sublattices, each of which can be used to make a photonic crystal after selective removal of the other:
A more detailed account can be found in our press release:
English or
Dutch. Also read the News&Views article on this topic by D. J. Norris. 18-07-2006: Thermally excited capillary waves are suppressed by shear flow by Didi Derks, Dirk Aarts, Daniel Bonn, Henk Lekkerkerker, and Arnout Imhof. A FOM press release explains our findings in non-scientific Dutch.
08-03-2006: Prediction and observation of crystal structures of oppositely charged colloids A.-P. Hynninen, C.G. Christova, R. van Roij, A. van Blaaderen, and M. Dijkstra, accepted in Physical Review Letters (2006)
06-12-2005: Antti-Pekka Hynninen received his doctorate cum laude. 08-09-2005: SCM group publishes an article in Nature on "Ionic colloidal crystals of oppositely charged particles"
05-07-2005: SCM group is awarded a prestigious TOP grant by the
Netherlands Organisation for Scientific Research (NWO). Please read the NWO press release (in Dutch). 8-04-2005: Phase diagram of dipolar hard and soft spheres:Manipulation of colloidal crystal structures by an external field, Antti-Pekka Hynninen and Marjolein Dijkstra, Physical Review Letters 94, 138303 (2005) Please read the press release by FOM. 22-11-2004: Dirk Vossen earns his doctorate cum laude ! 30-6-2004: UU awards High Potentials subsidy to Marjolein Dijkstra, René van Roij and Arnout Imhof ! Please read the press release by Utrecht University. 30-1-2003: A colloidal model system with tunable interactions Watching crystals grow and melt by tuning the interation potential:Anand Yethiraj and Alfons van Blaaderen, Nature 421 (30 January 2003), 513 - 517 Read more in AMOLF highlights (in English), Persbericht (in Dutch), or Bild der Wissenschaft (in German). Click here for a cool picture! 13-01-2003: Epitaxial growth of charged colloids See how surface templates produce three-dimensional order in colloids!J. P. Hoogenboom, A. Yethiraj, A. K. van Langen-Suurling, J. Romijn, and A. van Blaaderen, Physical Review Letters 89, 256104 (2002). Click here for a cool picture! 05-04-2002: A new way to build binary colloidal crystals The journal Science has published our layer-by-layer method to build binary colloidal crystals:K.P. Velikov, C.G. Christova, R.P.A. Dullens, and A. van Blaaderen, Science 296, 106 (2002). Click here for a cool picture! A press release can be found here (in Dutch). 18-03-2002: Krassimir Velikov defends his thesis And successfully, too! Krassimir now has his PhD. 11-06-2001: Soft Condensed Matter Online Our easy-to-remember web address: www.colloid.nl 29-03-2001: Poster prijs Peter Vergeer
29-03-2001: Oratie Alfons van Blaaderen: Klik hier voor het nieuwsbericht
20-04-2000: Minerva Prijs Marjolein Dijkstra
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| modified: 24-05-2011 09:52 |
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