Analysis of dynamic surface tension data for SDS–DTAB mixed solutions

2004 ◽  
Vol 6 (7) ◽  
pp. 1592-1596 ◽  
Author(s):  
Ch. Frese ◽  
S. Ruppert ◽  
H. Schmidt-Lewerkühne ◽  
K. P. Wittern ◽  
R. Eggers ◽  
...  
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Surface Tension Data ◽  
Dynamic Surface ◽  
Mixed Solutions

A Microfluidic Tensiometer

2004 ◽  
Author(s):  
Hans C. Mayer ◽  
Shelley L. Anna
Keyword(s):  
Surface Tension ◽  
Transport Mechanism ◽  
Microfluidic Devices ◽  
Dynamic Surface Tension ◽  
Two Phase ◽  
Surface Tension Data ◽  
Dynamic Surface ◽  
Theoretical Predictions ◽  
Surfactant Transport ◽  
Interface Curvature

Recent theoretical predictions indicate that a shift in surfactant transport mechanism from diffusion controlled to kinetically controlled occurs at highly curved interfaces where the length scale is on the same order as feature sizes in microfluidic devices. At present, experimental evidence of this shift in transport mechanism is lacking and this is due to the limitations on degree of interface curvature imposed by traditional methods of surface tension measurement. We show that the measurement of dynamic surface tension is possible at highly curved interfaces using a microfluidic tensiometer that utilizes glass micropipettes to control curvature dimension. Comparison of dynamic surface tension data from our microfluidic tensiometer with data obtained from traditional techniques will validate the theoretical arguments reported, and will improve understanding of two phase flows in microfluidic devices.

scholarly journals A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes

2021 ◽  
Vol 5 (3) ◽  
pp. 37
Author(s):  
Hernán Martinelli ◽  
Claudia Domínguez ◽  
Marcos Fernández Leyes ◽  
Sergio Moya ◽  
Hernán Ritacco
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Foam Formation ◽  
Ph Responsive ◽  
Dynamic Surface ◽  
X Ray ◽  
Equilibrium Surface Tension ◽  
Potential Applications ◽  
The Stability ◽  
Air Interfaces

In the search for responsive complexes with potential applications in the formulation of smart dispersed systems such as foams, we hypothesized that a pH-responsive system could be formulated with polyacrylic acid (PAA) mixed with a cationic surfactant, Gemini 12-2-12 (G12). We studied PAA-G12 complexes at liquid–air interfaces by equilibrium and dynamic surface tension, surface rheology, and X-ray reflectometry (XRR). We found that complexes adsorb at the interfaces synergistically, lowering the equilibrium surface tension at surfactant concentrations well below the critical micelle concentration (cmc) of the surfactant. We studied the stability of foams formulated with the complexes as a function of pH. The foams respond reversibly to pH changes: at pH 3.5, they are very stable; at pH > 6, the complexes do not form foams at all. The data presented here demonstrate that foam formation and its pH responsiveness are due to interfacial dynamics.

An axisymmetric model for the analysis of dynamic surface tension

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 7921-7931 ◽  
Author(s):  
S. I. Arias ◽  
J. R. Fernández ◽  
L. García-Rio ◽  
J. C. Mejuto ◽  
M. C. Muñiz ◽  
...  
Keyword(s):  
Surface Tension ◽  
Diffusion Length ◽  
Dynamic Surface Tension ◽  
Ionic Surfactants ◽  
Adsorption Behaviour ◽  
Dynamic Surface ◽  
Axisymmetric Model

An axisymmetric model accounts for dynamic surface tension of non-ionic surfactants under consideration of diffusive adsorption behaviour with a finite diffusion length.

Effect of plasticizer on the dynamic surface tension and the free volume of Eudragit systems

2002 ◽  
Vol 244 (1-2) ◽  
pp. 81-86 ◽  
Author(s):  
Romána Zelkó ◽  
Á Orbán ◽  
K Süvegh ◽  
Z Riedl ◽  
I Rácz
Keyword(s):  
Surface Tension ◽  
Free Volume ◽  
Dynamic Surface Tension ◽  
Dynamic Surface
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