Sphere-to-Rod Transition in the Shape of Anionic Surfactant Micelles Determined by Surface Tension Measurements

Langmuir ◽  
1997 ◽  
Vol 13 (21) ◽  
pp. 5544-5551 ◽  
Author(s):  
R. G. Alargova ◽  
K. D. Danov ◽  
J. T. Petkov ◽  
P. A. Kralchevsky ◽  
G. Broze ◽  
...  
Keyword(s):  
Surface Tension ◽  
Anionic Surfactant ◽  
Surfactant Micelles

Preparation and Property Evaluation of Anionic Clean Fracturing Fluid

2012 ◽  
Vol 602-604 ◽  
pp. 1238-1242 ◽  
Author(s):  
Guan Jun Liu ◽  
Xiao Rui Li ◽  
Li Jun Zheng
Keyword(s):  
Surface Tension ◽  
Anionic Surfactant ◽  
Shear Resistance ◽  
Sedimentation Velocity ◽  
Fracturing Fluid ◽  
Temperature Resistance ◽  
The Core ◽  
Damage Rate ◽  
Property Evaluation ◽  
Resistance Performance

An anionic surfactant clean fracturing fluid was synthesized and its main performance was studied. The viscosity of fracturing fluid increased with increasing dosage of anionic surfactant. And the viscosity of fracturing fluid increased first, and then decreased with increasing concentration of KCl. The viscosity reached maximum 360 mPa•s when the KCl content is 2.7%. The results showed that the fracturing fluid had best temperature resistance and shear resistance performance under the condition of 100°C and at the shearing rate of 170 s-1. The sedimentation velocity of sand in the fracturing fluid are about 11.124, 18.840 mm/min at the temperature of 80°C and 120°C respectively. It indicated that the fracturing fluid has a better sand-carrying performance. The viscosity of fracturing fluid decreased below 5 mPa•s during 70 minutes when the dosage of kerosene was 3%, and the surface tension of the breaker fluid is 26.10 mN/m while the interfacial tension is 0.73mN/m. The low surface tension can meet the requirements of operation. The damage rate to the core is 7.65% and the fracturing fluid has lower damage to core than guar gel.

Preparation of a new lignin-based anionic/cationic surfactant and its solution behaviour

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2441-2448 ◽  
Author(s):  
Mingsong Zhou ◽  
Wenli Wang ◽  
Dongjie Yang ◽  
Xueqing Qiu
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Water Interface ◽  
Air Water Interface ◽  
Solution Behaviour

The lignin-based cationic/anionic surfactant CA-SLs have a stronger ability to lower the surface tension at the air/water interface compared with SL–PEG, but a weaker one than CTAB.

Investigation on the Effect of an Divalent Electrolyte on the Flocculation of SDBS with Al3+

2012 ◽  
Vol 610-613 ◽  
pp. 163-168
Author(s):  
Jie Yan ◽  
Dong Wang ◽  
Fei Fei Yang ◽  
Dong Mei Yao
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Zeta Potential ◽  
Anionic Surfactant ◽  
Potential Surface ◽  
Sodium Dodecylbenzenesulfonate ◽  
Molar Ratios ◽  
Ph Values ◽  
Average Size

The effect of an divalent electrolyte Ca2+ on the flocculation of two different concentrations of anionic surfactant Sodium Dodecylbenzenesulfonate (SDBS) with Al3+ has been investigated at different molar ratios Al3+ to SDBS at 298.15 K. The results showed that the flocculation characteristics of 0.01 mol•L-1 SDBS (above the critical micelle concentration CMC) and 0.001 mol•L-1 SDBS (below the CMC) were obviously different with an increase of dosages of Al3+. The z-average size of flocculate of 0.01 mol•L-1 SDBS with Al3+ decreased particularly with the pre-addition of Ca2+，It suggested the formation of the complexion Ca(SDBS)2. At optimization flocculation areas at 298.15K, pH values were all around 3.5 in the flocculation systems SDBS/Al3+ and Ca2+/SDBS/Al3+ whether the SDBS concentration above or below the CMC. The pre-addition of Ca2+ slightly affected other flocculation parameters of SDBS/Al3+ systems such as zeta potential, surface tension, conductivity and pH.

Article

1998 ◽  
Vol 76 (2) ◽  
pp. 152-157
Author(s):  
Catherine E Drennan ◽  
Rachelle J Hughes ◽  
Vincent C Reinsborough ◽  
Oladega O Soriyan
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Mixed Micelles ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Surfactant Solution ◽  
Kinetic Studies ◽  
Stopped Flow ◽  
Dilute Solution ◽  
Surfactant Micelles

Kinetic studies through stopped-flow spectroscopy were undertaken in the dilute solution range of anionic surfactants where pronounced rate enhancement or inhibition of Ni2+-ligand complexations is often observed at surfactant concentrations much below the critical micelle concentration (CMC). The results are interpreted in terms of Ni-surfactant micelles as the agents responsible for the rate changes in dilute surfactant solution. At higher surfactant concentrations these micelles are transformed into mixed micelles (counterion and size changes), eventually becoming normal surfactant micelles close to the CMC. Surface tension, dye solubility, conductivity, and fluorescent probe investigations support this interpretation.Key words: micellar catalysis, sodium dodecyl sulfate, micelles, critical micelle concentration, premicelles, Ni2+-ligand complexations.

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