Sun, 27 Jul 2008 08:02:58 BST CiteULike: dchen's Pryamitsyn http://www.citeulike.org/user/dchen/author/Pryamitsyn CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2763281 <i>Physical Review Letters, Vol. 100, No. 12. (2008)</i><br /><br />Applications of probe diffusion in polymer matrices typically envision that for particles sizes (R) larger than the correlation length of the polymer solution (), the probe (at long times) diffuses as in a continuum polymer solution. We present simulation results for probe diffusion in rod solutions which challenge this conventional wisdom and indicate a new mechanism of a probe diffusion operative for R>. Our simulation results are rationalized by scaling arguments invoking a novel mechanism of the constraint release motion of the rods, and suggest that the dynamical characteristics of the polymer matrix also proves important in developing a complete description of the probe motion. Dynamics of Probe Diffusion in Rod Solutions Victor Pryamitsyn Venkat Ganesan doi:10.1103/PhysRevLett.100.128302 Physical Review Letters, Vol. 100, No. 12. (2008) 2008-05-07T00:55:39-00:00 2008 Physical Review Letters 100 12 APS diffusion dynamics rod tracer