期刊
JOURNAL OF CHEMICAL PHYSICS
卷 157, 期 8, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0098506
关键词
-
资金
- National Science Foundation
This perspective discusses the interplay between osmotic and electrostatic forces in promoting molecular and colloidal diffusion, highlighting the overestimation of dielectric friction in standard theories for small solutes and colloidal particles.
In the Stokes-Einstein picture, diffusion of a Brownian particle or a molecule in a liquid solvent is caused by unbalanced fluctuations of osmotic forces on different sides of the particle. When the particle carries a charge or a higher multipolar moment, this picture is amended by fluctuations of electrostatic forces producing dielectric friction. Dielectric friction slows down both the translational and rotational diffusion. While this picture is well established and is physically sound, standard theories grossly overestimate the magnitude of dielectric friction for small dipolar solutes and larger colloidal particles, such as proteins. Motivated by recent simulation studies, this Perspective discusses the interplay between osmotic (van der Waals) and electrostatic forces in promoting molecular and colloidal diffusion. Much can be learned about microscopic friction mechanisms from statistical and dynamical correlations between osmotic and electrostatic forces.
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