A Cationic Fluorocarbon Surfactant DEFUMACl and Its Mixed Systems with Cationic Surfactants: 19F NMR and Surface Tension Study

2007 ◽  
Vol 111 (21) ◽  
pp. 5903-5910 ◽  
Author(s):  
Shuli Dong ◽  
Xin Li ◽  
Guiying Xu ◽  
Heinz Hoffmann
Keyword(s):  
Surface Tension ◽  
Cationic Surfactants ◽  
19F Nmr ◽  
Fluorocarbon Surfactant ◽  
Surface Tension Study ◽  
Mixed Systems

Self-assembly of the mixed systems based on cationic surfactants and different types of polyanions: The influence of structural and concentration factors

2018 ◽  
Vol 272 ◽  
pp. 892-901 ◽  
Author(s):  
E.A. Vasilieva ◽  
D.A. Samarkina ◽  
G.A. Gaynanova ◽  
S.S. Lukashenko ◽  
D.R. Gabdrakhmanov ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cationic Surfactants ◽  
Different Types ◽  
Concentration Factors ◽  
Mixed Systems

Polyampholyte/Surfactant Complexes at the Water–Air Interface: A Surface Tension Study

Langmuir ◽  
2013 ◽  
Vol 29 (25) ◽  
pp. 7600-7606 ◽  
Author(s):  
Mabya Fechner ◽  
Joachim Koetz
Keyword(s):  
Surface Tension ◽  
Air Interface ◽  
Surface Tension Study

scholarly journals Poly(Oxyethylene)-Amidoamine Based Gemini Cationic Surfactants for Oilfield Applications: Effect of Hydrophilicity of Spacer Group

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1046 ◽  
Author(s):  
S. M. Shakil Hussain ◽  
Ahmad Mahboob ◽  
Muhammad Shahzad Kamal
Keyword(s):  
Surface Tension ◽  
High Temperature ◽  
Critical Micelle Concentration ◽  
Cationic Surfactants ◽  
Structural Integrity ◽  
High Salinity ◽  
Heat Stability ◽  
High Heat ◽  
Gravimetric Analysis ◽  
Nacl Solution

Thermal stability, salt tolerance, and solubility in normal and high salinity brine are the major requirements for any surfactant designed for oilfield applications because the surfactant stays in a non-ambient environment inside the reservoir for a long period of time. Herein, a series of new gemini cationic surfactants (GSs) with varying spacer hydrophilicity were synthesized and elucidated using MALDI-ToF-MS, NMR (1H, 13C), as well as FTIR spectroscopy. GSs found to be soluble in normal as well as high salinity brine and aqueous stability tests revealed that GSs possess the ability to retain their structural integrity at high salinity and high temperature conditions because no suspension formation or precipitation was detected in the oven aged sample of GSs at 90 °C for 30 days. Thermal gravimetric analysis displayed a higher decomposition temperature than the real reservoir temperature and the GS with a secondary amine spacer exhibited high heat stability. The significant reduction in surface tension and critical micelle concentration was observed using 1 M NaCl solution in place of deionized water. The difference in surface tension and critical micelle concentration was insignificant when the 1 M NaCl solution was replaced with seawater. The synthesized surfactants can be utilized for oilfield applications in a challenging high temperature high salinity environment.

scholarly journals Investigation of Interfacial Free Energy of Three-Phase Contact on a Glass Sphere in Case of Cationic-Anionic Surfactant Aqueous Mixtures

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 573
Author(s):  
Lidia A. Alexandrova ◽  
Ljudmil S. Grigorov ◽  
Nikolay A. Grozev ◽  
Stoyan I. Karakashev
Keyword(s):  
Surface Tension ◽  
Synergetic Effect ◽  
Good Method ◽  
Interfacial Free Energy ◽  
Aqueous Mixtures ◽  
Complete Wetting ◽  
Air Interface ◽  
Foam Flotation ◽  
Three Phase ◽  
Mixed Systems

The wetting of adsorbed surfactants solids is important for various technological applications in particular for the process of foam flotation. The present work aims at calculating the surface tensions of the three phase interfaces at different surfactant concentrations using the Girifalco and Good method. For this purpose, the surface tension and contact angle vs. surfactant concentration of the test substances amines and sulfonates and their mixture were measured for liquid–air interface. Calculated surface tension of solid–air interface vs. concentration for C10 amine and mixed systems are close to those for the liquid–air surface, but are slightly lower. In the case of mixed systems, the graph has a specific structure similar to that of liquid–air surface dependence. In contrast to the solid–air interface results, the solid–liquid surface tension values are significantly lower. In case of the mixed surfactant systems, C10amine/C10 sulfonate, a synergetic effect on the surface tension is observed. The specific behavior of the mixed systems is interpreted with the emergence of aggregates consisting of the anionic and cationic surfactants. It is shown that in the whole area of concentrations complete wetting does not occur.

scholarly journals The behaviour of hyaluronan solutions in the presence of Hofmeister ions: A light scattering, viscometry and surface tension study

2019 ◽  
Vol 212 ◽  
pp. 395-402 ◽  
Author(s):  
Lenka Musilová ◽  
Věra Kašpárková ◽  
Aleš Mráček ◽  
Antonín Minařík ◽  
Martin Minařík
Keyword(s):  
Surface Tension ◽  
Light Scattering ◽  
Surface Tension Study

Concentration fluctuations and surface adsorption in non-ideal binary mixtures. A light-scattering and surface tension study

2003 ◽  
Vol 5 (21) ◽  
pp. 4864-4868 ◽  
Author(s):  
Ramón G. Rubio ◽  
Ana Díez-Pascual ◽  
Baudilio Coto ◽  
A. Crespo-Colín ◽  
A. Compostizo
Keyword(s):  
Surface Tension ◽  
Light Scattering ◽  
Binary Mixtures ◽  
Surface Adsorption ◽  
Concentration Fluctuations ◽  
Surface Tension Study
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