Dependence of Surface Tension on Surface Concentration in Ionic Surfactant Solutions and Influences of Supporting Electrolyte Therein

2019 ◽  
Vol 56 (6) ◽  
pp. 484-489
Author(s):  
Chuangye Wang ◽  
Feng Liu ◽  
Hongxia Yang ◽  
Harald Morgner ◽  
Longli Zhang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Supporting Electrolyte ◽  
Surface Concentration ◽  
Ionic Surfactant ◽  
Surfactant Solutions

Influence of electrolytes on the dynamic surface tension of ionic surfactant solutions: Expanding and immobile interfaces

2006 ◽  
Vol 303 (1) ◽  
pp. 56-68 ◽  
Author(s):  
Krassimir D. Danov ◽  
Peter A. Kralchevsky ◽  
Kavssery P. Ananthapadmanabhan ◽  
Alex Lips
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Ionic Surfactant ◽  
Dynamic Surface ◽  
Surfactant Solutions

scholarly journals Role of the Counterions in the Surface Tension of Aqueous Surfactant Solutions. A Computer Simulation Study of Alkali Dodecyl Sulfate Systems

2020 ◽  
Vol 4 (2) ◽  
pp. 15 ◽  
Author(s):  
György Hantal ◽  
Marcello Sega ◽  
George Horvai ◽  
Pál Jedlovszky
Keyword(s):  
Surface Tension ◽  
Force Fields ◽  
Surface Concentration ◽  
Pressure Profile ◽  
Water Model ◽  
Model Combination ◽  
Neat Water ◽  
Surfactant Solutions ◽  
Dodecyl Sulfate ◽  
Dynamics Simulations

We have investigated the surface tension contributions of the counterions, surfactant headgroups and tails, and water molecules in aqueous alkali dodecyl sulfate (DS) solutions close to the saturated surface concentration by analyzing the lateral pressure profile contribution of these components using molecular dynamics simulations. For this purpose, we have used the combination of two popular force fields, namely KBFF for the counterions and GROMOS96 for the surfactant, which are both parameterized for the SPC/E water model. Except for the system containing Na+ counterions, the surface tension of the surfactant solutions has turned out to be larger rather than smaller than that of neat water, showing a severe shortcoming of the combination of the two force fields. We have traced back this failure of the potential model combination to the unphysically strong attraction of the KBFF counterions, except for Na+, to the anionic head of the surfactants. Despite this failure of the model, we have observed a clear relation between the soft/hard character (in the sense of the Hofmeister series) and the surface tension contribution of the counterions, which, given the above limitations of the model, can only be regarded as an indicative result. We emphasize that the obtained results, although in a twisted way, clearly stress the crucial role the counterions of ionic surfactants play in determining the surface tension of the aqueous surfactant solutions.

The kinetics of the surface tension of micellar surfactant solutions

1991 ◽  
Vol 60 ◽  
pp. 235-261 ◽  
Author(s):  
C.D. Dushkin ◽  
I.B. Ivanov ◽  
P.A. Kralchevsky
Keyword(s):  
Surface Tension ◽  
Surfactant Solutions ◽  
Micellar Surfactant Solutions ◽  
Kinetics Of

Study of Surface Tension and Natural Evaporation of Aqueous Surfactant Solutions

2018 ◽  
Author(s):  
Birce Dikici ◽  
Matthew J. Lehman
Keyword(s):  
Surface Tension ◽  
Natural Convection ◽  
Water Loss ◽  
Heat Dissipation ◽  
Eastern Africa ◽  
Working Fluid ◽  
Lauryl Sulfate ◽  
Surfactant Solutions ◽  
Eastern Australia ◽  
Wilhelmy Plate Method

Surface tension and solution evaporation of aqueous solutions of sodium lauryl sulfate (SLS), ECOSURF™ EH-14, and ECOSURF™ SA-9 under natural convection is examined through experimental methods. SLS is an anionic surfactant while EH-14 and SA-9 are environmentally-friendly nonionic surfactants. Surfactants are known to affect evaporation performance of solutions and are studied in relation to water loss prevention and heat dissipation. Surfactants could be useful under drought conditions which present challenges to water management on a yearly basis in arid areas of the world. Recent water scarcity in the greater Los Angeles area, south eastern Africa nations, eastern Australia and eastern Mediterranean countries has high cost of water loss by evaporation. Surfactants are studied as a potential method of suppressing evaporation in water reservoirs. Surfactants are also studied as performance enhancers for the working fluid of heat dissipation devices, such as pulsating heat pipes used for electronics cooling. Some surfactants have been shown to lower thermal resistances and friction pressure in such devices and thereby increase their efficiency. The static surface tensions of the aqueous-surfactant solutions are measured with surface tensiometer using Wilhelmy plate method. The surfactants are shown to lower surface tension significantly from pure water. The surface tension values found at the Critical Micelle Concentration are 33.8 mN/m for SLS, 30.3 mN/m for EH-14, and 30.0 mN/m for SA-9. All three surfactants reduced natural convection water loss over 5 days with SLS showing the greatest effect on evaporation rates. The maximum evaporation reduction by each surfactant from distilled water with no surfactants after 5 days is 26.1% for SLS, 20.8% for EH-14, and 18.4% for SA-9.

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