Sat, 26 Jul 2008 06:27:09 BST CiteULike: dchen's Stradner http://www.citeulike.org/user/dchen/author/Stradner CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2759111 <i>Physical Review Letters, Vol. 100, No. 17. (2008)</i><br /><br />We determine the structure of charge-stabilized colloidal suspensions at low ionic strength over an extended range of particle volume fractions using a combination of light and small angle neutron scattering experiments. The variation of the structure factor with concentration is analyzed within a one-component model of a colloidal suspension. We show that the observed structural behavior corresponds to a nonmonotonic density dependence of the colloid effective charge and the mean interparticle interaction energy. Our findings are corroborated by similar observations from primitive model computer simulations of salt-free colloidal suspensions. Density Dependent Interactions and Structure of Charged Colloidal Dispersions in the Weak Screening Regime Rojas Ochoa Casta\ V Lobaskin A Stradner F Scheffold P Schurtenberger doi:10.1103/PhysRevLett.100.178304 Physical Review Letters, Vol. 100, No. 17. (2008) 2008-05-05T20:12:24-00:00 2008 Physical Review Letters 100 17 APS 2008 charge colloids structure http://www.citeulike.org/user/dchen/article/2548050 <i>Physical Review Letters, Vol. 99, No. 19. (2007)</i><br /><br />Small-angle neutron scattering experiments and molecular dynamics simulations combined with an application of concepts from soft matter physics to complex protein mixtures provide new insight into the stability of eye lens protein mixtures. Exploring this colloid-protein analogy we demonstrate that weak attractions between unlike proteins help to maintain lens transparency in an extremely sensitive and nonmonotonic manner. These results not only represent an important step towards a better understanding of protein condensation diseases such as cataract formation, but provide general guidelines for tuning the stability of colloid mixtures, a topic relevant for soft matter physics and industrial applications. New Insight into Cataract Formation: Enhanced Stability through Mutual Attraction A Stradner G Foffi N Dorsaz G Thurston P Schurtenberger doi:10.1103/PhysRevLett.99.198103 Physical Review Letters, Vol. 99, No. 19. (2007) 2008-03-18T02:02:58-00:00 2007 Physical Review Letters 99 19 APS 2007 biology colloids focus interaction