Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||M Mansfield; Jack F. Douglas; Saba Irfan; E Kang;|
|Title:||Comparison of Methods for Calculating the Friction Coefficient and Intrinsic Viscosity of Nanoparticles and Macromolecules|
|Abstract:||Various methods have been proposed to estimate the translational friction coefficient f and the intrinsic viscosity [?] of polymers and other particles of complex shape. These methods range from first-principles calculations based on a precise description of particle shape and the solution of the Stokes equation to highly coarse-grained bead model descriptions of complex polymer structures at an intermediate level of modeling, and finally to phenomenological estimates that relate f to the particle s surface area. These treatments often involve slender-body and various preaveraging approximations, etc., that render the calculation analytically tractable, but numerically uncertain. Powerful numerical methods have become available in recent years that allow the assessment of the accuracy of these estimates. We compare several methods of computing f and [?] to determine their applicability to various classes of particle shapes.|
|Keywords:||capacity,diffusion coefficient,intrinsic viscosity,nanoparticle,particle charcterization,poalrizability,transport properties|