Sat, 05 Jul 2008 00:16:12 BST CiteULike: dchen Hu http://www.citeulike.org/user/dchen/author/Hu CiteULike.org en-gb Copyright © 2004-2008 citeulike.org 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/2750302 <i>Physical Review Letters, Vol. 99, No. 6. (2007)</i><br /><br />We show that while the statistics of static speckle patterns are generic, fluctuations in the change within speckle patterns are greatly enhanced in the localization transition. The probability distributions of the displacement of phase singularities and the standard deviations of the changes of phase and intensity with frequency shift of incident microwave radiation are given in terms of the same expression which describes the probability distribution of total transmission. This function depends only upon a single parameter, the variance of the corresponding variable. The changing statistics in the localization transition reflects the number of underlying electromagnetic modes with which the incident wave interacts. Speckle Evolution of Diffusive and Localized Waves Sheng Zhang Bing Hu Patrick Sebbah Azriel Genack doi:10.1103/PhysRevLett.99.063902 Physical Review Letters, Vol. 99, No. 6. (2007) 2008-05-03T19:57:29-00:00 2007 Physical Review Letters 99 6 APS 2007 focus material scattering http://www.citeulike.org/user/dchen/article/2553408 <i>Physical Review Letters, Vol. 98, No. 14. (2007)</i><br /><br />We investigate evaporative lithography as a route for patterning colloidal films. Films are dried beneath a mask that induces periodic variations between regions of free and hindered evaporation. Direct imaging reveals that particles segregate laterally within the film, as fluid and entrained particles migrate towards regions of higher evaporative flux. The films exhibit remarkable pattern formation that can be regulated by tuning the initial suspension composition, separation distance between the mask and underlying film, and mask geometry. Patterning Colloidal Films via Evaporative Lithography Daniel Harris Hua Hu Jacinta Conrad Jennifer Lewis doi:10.1103/PhysRevLett.98.148301 Physical Review Letters, Vol. 98, No. 14. (2007) 2008-03-19T01:18:09-00:00 2007 Physical Review Letters 98 14 APS 2007 colloids cool film