On the Breakdown of the Stokes−Einstein Law in Supercooled Liquids Export

@article{citeulike:5978308, abstract = {PMID: 16853782 The wavevector-dependent shear viscosity, eta(k), is evaluated for a range of temperatures in a supercooled binary LennardJones liquid. The mode coupling theory of Keyes and Oppenheim (Phys. Rev. A 1973, 8, 937) expresses the self-diffusion constant, D, in terms of eta(k). Replacing eta(k) with the usual viscosity, eta eta(k = 0), yields the StokesEinstein law. It is found that the breakdown of the SE law in this system is well described by keeping the simulated k-dependence. Simply put, bath processes on all length scales (wavevectors) contribute to D, the system is much less viscous at finite k, and thus D exceeds the SE estimate based upon eta. The functional form of eta(k) allows for the estimation of a correlation length that grows with decreasing T.}, author = {Kim, Joohyun and Keyes, T.}, citeulike-article-id = {5978308}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/jp052338r}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/jp052338r}, day = {1}, doi = {10.1021/jp052338r}, journal = {The Journal of Physical Chemistry B}, keywords = {diffusion, glass, rheology, simulation}, month = {November}, number = {45}, pages = {21445--21448}, posted-at = {2009-10-21 02:51:44}, priority = {2}, title = {On the Breakdown of the Stokes−Einstein Law in Supercooled Liquids}, url = {http://dx.doi.org/10.1021/jp052338r}, volume = {109}, year = {2005} }

TY - JOUR ID - citeulike:5978308 L3 - citeulike-article-id:5978308 N2 - PMID: 16853782 The wavevector-dependent shear viscosity, eta(k), is evaluated for a range of temperatures in a supercooled binary LennardJones liquid. The mode coupling theory of Keyes and Oppenheim (Phys. Rev. A 1973, 8, 937) expresses the self-diffusion constant, D, in terms of eta(k). Replacing eta(k) with the usual viscosity, eta eta(k = 0), yields the StokesEinstein law. It is found that the breakdown of the SE law in this system is well described by keeping the simulated k-dependence. Simply put, bath processes on all length scales (wavevectors) contribute to D, the system is much less viscous at finite k, and thus D exceeds the SE estimate based upon eta. The functional form of eta(k) allows for the estimation of a correlation length that grows with decreasing T. IS - 45 JF - The Journal of Physical Chemistry B EP - 21448 TI - On the Breakdown of the Stokes−Einstein Law in Supercooled Liquids VL - 109 SP - 21445 KW - diffusion KW - glass KW - rheology KW - simulation AU - Kim, Joohyun AU - Keyes, T PY - 2005/11/01/ UR - http://dx.doi.org/10.1021/jp052338r ER -