Sun, 27 Jul 2008 08:01:46 BST CiteULike: dchen's clusters http://www.citeulike.org/user/dchen/tag/clusters CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2877886 <i>Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 77, No. 3. (2008)</i><br /><br />We report the formation of stable two-dimensional clusters consisting of long-range-interacting colloidal particles with predefined magnetic moments. The symmetry and arrangement of the particles within the cluster are imposed by the magnetic frustration. By satisfying the criteria of stability, a series of magic number clusters is formed. The magic clusters are close packed and have compensating magnetic moments and chirality. Thus, the system can be regarded as a classical mesoscopic model for spin arrangements in two-dimensional triangular antiferromagnets, although the exact nature of the interactions between the macroscopic magnetic moments is different. Frustration-induced magic number clusters of colloidal magnetic particles Larysa Baraban Denys Makarov Manfred Albrecht Nicolas Rivier Paul Leiderer Artur Erbe doi:10.1103/PhysRevE.77.031407 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 77, No. 3. (2008) 2008-06-09T18:57:10-00:00 2008 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) 77 3 APS 2008 clusters colloids control field magnetic pre http://www.citeulike.org/user/dchen/article/2873839 <i>Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 77, No. 6. (2008)</i><br /><br />We report dynamic Monte Carlo simulations of immiscible binary polymer blends, which exhibit weakly enhanced crystal nucleation near interfaces between two phase-separated polymers. We found that this enhancement is not accompanied by any preferred crystal orientation, implying its origin is mainly of enthalpic rather than entropic nature. Mean-field theory of polymer blends predicts that for immiscible polymers the melting point of the crystallizable component increases upon dilution in the other component, while it normally decreases for miscible blends. A local dilution is forced to occur at the diffuse interface of immiscible polymers; therefore the melting point of crystallizable polymers rises, which, in turn, enhances the thermodynamic driving force for crystal nucleation near the interface. Crystal nucleation enhanced at the diffuse interface of immiscible polymer blends Yu Ma Liyun Zha Wenbing Hu Günter Reiter Charles Han doi:10.1103/PhysRevE.77.061801 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 77, No. 6. (2008) 2008-06-08T18:30:03-00:00 2008 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) 77 6 APS 2008 clusters people polymer simulation http://www.citeulike.org/user/dchen/article/2766831 <i>Physical Review Letters, Vol. 100, No. 14. (2008)</i><br /><br />We investigate the collective organization of paramagnetic colloidal particles externally driven above the periodic stripes of a uniaxial ferrimagnetic garnet film. An external field modulation induces vibration of the stripe walls and produces random motion of the particles. Defects in the stripe pattern break the symmetry of the potential and favor particle nucleation into large clusters above a critical density. Mismatch between particle size and pattern wavelength generates assemblies with different morphological order. At even higher field strengths, repulsive dipolar interactions between the particles induce cluster melting. We propose a novel approach to generate and externally control a variety of colloidal assemblies. Colloidal Assembly on Magnetically Vibrated Stripes Pietro Tierno Thomas Fischer Tom Johansen Francesc Sagués doi:10.1103/PhysRevLett.100.148304 Physical Review Letters, Vol. 100, No. 14. (2008) 2008-05-07T15:36:01-00:00 2008 Physical Review Letters 100 14 APS clusters colloids magnetic http://www.citeulike.org/user/dchen/article/2711055 <i>Physical Review Letters, Vol. 93, No. 10. (2004), 108302.</i> Limits to Gelation in Colloidal Aggregation S Manley L Cipelletti V Trappe AE Bailey RJ Christianson U Gasser V Prasad PN Segre MP Doherty S Sankaran AL Jankovsky B Shiley J Bowen J Eggers C Kurta T Lorik DA Weitz doi:10.1103/PhysRevLett.93.108302 Physical Review Letters, Vol. 93, No. 10. (2004), 108302. 2008-04-23T23:55:21-00:00 2004 Physical Review Letters 93 10 108302 American Physical Society clusters colloids gel weitz