CiteULike: dchens interaction http://www.citeulike.org/user/dchen/tag/interaction CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2791741 <i>Physical Review Letters, Vol. 97, No. 12. (2006)</i><br /><br />We numerically study many-body interactions among colloidal particles suspended in a nematic liquid crystal, using a fluid particle dynamics method, which properly incorporates dynamical coupling among particles, nematic orientation, and flow field. Based on simulation results, we propose a new type of interparticle interaction in addition to well-known quadrupolar interaction for particles accompanying Saturn-ring defects. This interaction is mediated by the defect of the nematic phase: upon nematic ordering, a closed disclination loop binds more than two particles to form a sheetlike dynamically arrested structure. The interaction depends upon the topology of a disclination loop binding particles, which is determined by aggregation history. Colloidal Aggregation in a Nematic Liquid Crystal: Topological Arrest of Particles by a Single-Stroke Disclination Line Takeaki Araki Hajime Tanaka doi:10.1103/PhysRevLett.97.127801 Physical Review Letters, Vol. 97, No. 12. (2006) 2008-05-13T00:24:02-00:00 Physical Review Letters 97 12 APS 2006 colloids defect interaction liquidcrystal simulation tanaka http://www.citeulike.org/user/dchen/article/2767397 <i>Physical Review Letters, Vol. 100, No. 11. (2008)</i><br /><br />Optical tweezers are employed to measure the forces of interaction within a single pair of DNA-grafted colloids, dependent on the molecular weight of the DNA chains, and the concentration and valence of the surrounding ionic medium. The resulting forces are short range and set in as the surface-to-surface distance between the colloidal cores reaches the value of the brush height. The measured force-distance relation is analyzed by means of a theoretical treatment that quantitatively describes the effects of compression of the chains on the surface of the opposite-lying colloid. Quantitative agreement with the experiment is obtained for all parameter combinations. Polyelectrolyte-Compression Forces between Spherical DNA Brushes Kati Kegler Martin Konieczny Gustavo Espinosa Christof Gutsche Matthias Salomo Friedrich Kremer Christos Likos doi:10.1103/PhysRevLett.100.118302 Physical Review Letters, Vol. 100, No. 11. (2008) 2008-05-07T21:14:58-00:00 Physical Review Letters 100 11 APS biology colloids interaction opticaltweezer http://www.citeulike.org/user/dchen/article/2714010 <i>Nature, Vol. 420, No. 6913. (21 November 2002), pp. 299-301.</i> Electric-field-induced capillary attraction between like-charged particles at liquid interfaces MG Nikolaides AR Bausch MF Hsu AD Dinsmore MP Brenner C Gay DA Weitz doi:10.1038/nature01113 Nature, Vol. 420, No. 6913. (21 November 2002), pp. 299-301. 2008-04-24T19:25:39-00:00 Nature 420 6913 299 301 colloids interaction interface nature weitz http://www.citeulike.org/user/dchen/article/2713987 <i>Nature, Vol. 424, No. 6952. (2003), pp. 1014-1014.</i> Capillary attraction (communication arising): Like-charged particles at liquid interfaces MG Nikolaides AR Bausch MF Hsu AD Dinsmore MP Brenner C Gay DA Weitz doi:10.1038/4241014b Nature, Vol. 424, No. 6952. (2003), pp. 1014-1014. 2008-04-24T19:16:11-00:00 Nature 424 6952 1014 1014 interaction interface microrheology nature weitz 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 Physical Review Letters 99 19 APS 2007 biology colloids focus interaction