Surface shear viscosity of Gibbs and Langmuir monolayers. (English) Zbl 0958.76005

Barentin, Catherine; Ybert, Christophe; di Meglio, Jean-Marc; Joanny, Jean-François

J. Fluid Mech. 397, 331-349 (1999).

Summary: We present a new two-dimensional viscometer and hydrodynamic calculations used to obtain the surface viscosities from the measurements. In order to interpret the experiments performed with solutions of sodium dodecyl sulfate (SDS) and also with monolayers of insoluble surfactants, we develop various hydrodynamic models of soluble Gibbs monolayers and of incompressible Langmuir monolayers, that describe well the experimental results. In the case of SDS solutions, the calculations allow the determination of surface shear viscosity, and its value is in good agreement with previous studies.

MSC:

76A05	Non-Newtonian fluids
76-05	Experimental work for problems pertaining to fluid mechanics
82D60	Statistical mechanics of polymers

Keywords:

two-dimensional viscometer; sodium dodecyl sulfate; soluble Gibbs monolayers; incompressible Langmuir monolayers; surface shear viscosity