Thickness dependent effective viscosity of a polymer solution near an interface probed by a quartz crystal microbalance with dissipation method.

ABSTRACT: The solution viscosity near an interface, which affects the solution behavior and the molecular dynamics in the solution, differs from the bulk. This paper measured the effective viscosity of a dilute poly (ethylene glycol) (PEG) solution adjacent to a Au electrode using the quartz crystal microbalance with dissipation (QCM-D) technique. We evidenced that the effect of an adsorbed PEG layer can be ignored, and calculated the zero shear rate effective viscosity to remove attenuation of high shear frequency oscillations. By increasing the overtone n from 3 to 13, the thickness of the sensed polymer solution decreased from ~70 to 30 nm. The zero shear rate effective viscosity of the polymer solution and longest relaxation time of PEG chains within it decrease with increasing solution thicknes

SUBMITTER: Fang J 

PROVIDER: S-EPMC4329548 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature