Surface Shear Viscosity and Phase Transitions of Monolayers at the Air-Water Interface

1995 ◽  
Vol 5 (8) ◽  
pp. 1209-1221 ◽  
Author(s):  
A. Relini ◽  
F. Ciuchi ◽  
R. Rolandi
Keyword(s):  
Phase Transitions ◽  
Shear Viscosity ◽  
Water Interface ◽  
Surface Shear ◽  
Air Water Interface ◽  
Surface Shear Viscosity

scholarly journals Surface shear inviscidity of soluble surfactants

2014 ◽  
Vol 111 (10) ◽  
pp. 3677-3682 ◽  
Author(s):  
Zachary A. Zell ◽  
Arash Nowbahar ◽  
Vincent Mansard ◽  
L. Gary Leal ◽  
Suraj S. Deshmukh ◽  
...  
Keyword(s):  
Shear Viscosity ◽  
Nonionic Surfactants ◽  
Emulsion Stability ◽  
Foam Stability ◽  
Sensitivity Limit ◽  
Multiple Control ◽  
Surface Shear ◽  
Soluble Surfactants ◽  
Almost All ◽  
Surface Shear Viscosity

Foam and emulsion stability has long been believed to correlate with the surface shear viscosity of the surfactant used to stabilize them. Many subtleties arise in interpreting surface shear viscosity measurements, however, and correlations do not necessarily indicate causation. Using a sensitive technique designed to excite purely surface shear deformations, we make the most sensitive and precise measurements to date of the surface shear viscosity of a variety of soluble surfactants, focusing on SDS in particular. Our measurements reveal the surface shear viscosity of SDS to be below the sensitivity limit of our technique, giving an upper bound of order 0.01 μN·s/m. This conflicts directly with almost all previous studies, which reported values up to 103–104 times higher. Multiple control and complementary measurements confirm this result, including direct visualization of monolayer deformation, for SDS and a wide variety of soluble polymeric, ionic, and nonionic surfactants of high- and low-foaming character. No soluble, small-molecule surfactant was found to have a measurable surface shear viscosity, which seriously undermines most support for any correlation between foam stability and surface shear rheology of soluble surfactants.

Stress−Strain Curves of Adsorbed Protein Layers at the Air/Water Interface Measured with Surface Shear Rheology

Langmuir ◽  
2002 ◽  
Vol 18 (4) ◽  
pp. 1238-1243 ◽  
Author(s):  
Anneke Martin ◽  
Martin Bos ◽  
Martien Cohen Stuart ◽  
Ton van Vliet
Keyword(s):  
Water Interface ◽  
Stress Strain ◽  
Surface Shear ◽  
Shear Rheology ◽  
Adsorbed Protein ◽  
Air Water Interface
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