A Study of the Equilibrium Surface Tension and the Critical Micelle Concentration of Mixed Surfactant Solutions

Langmuir ◽  
1999 ◽  
Vol 15 (13) ◽  
pp. 4370-4376 ◽  
Author(s):  
Shi-Yow Lin ◽  
Yi-Yung Lin ◽  
En-Ming Chen ◽  
Ching-Ten Hsu ◽  
Chang-Chin Kwan
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Mixed Surfactant ◽  
Equilibrium Surface ◽  
Equilibrium Surface Tension ◽  
Surfactant Solutions

Equilibrium surface tension of aqueous surfactant solutions

1976 ◽  
Vol 254 (11) ◽  
pp. 1018-1023 ◽  
Author(s):  
T. Gildnyi ◽  
Chr Stergiopoulos ◽  
E. Wolfram
Keyword(s):  
Surface Tension ◽  
Equilibrium Surface ◽  
Equilibrium Surface Tension ◽  
Surfactant Solutions

Measurement of Dynamic and Equilibrium Surface Tension of Surfactant Solutions by the Maximum Bubble Pressure Method

2003 ◽  
Author(s):  
Manish Bahl ◽  
Juntao Zhang ◽  
Raj M. Manglik
Keyword(s):  
Surface Tension ◽  
Nucleate Boiling ◽  
Maximum Bubble Pressure ◽  
Maximum Bubble Pressure Method ◽  
Pressure Method ◽  
Equilibrium Surface ◽  
Equilibrium Surface Tension ◽  
Surfactant Solutions ◽  
Bubble Pressure ◽  
Triton X

Surfactant solution systems are encountered in many different applications, including as a method to enhance the nucleate boiling performance of water. Characterizing the attendant interfacial phenomena requires precise predictions of their surface tension relaxation behavior. In this study, both the dynamic and equilibrium surface tension behavior of aqueous surfactant solutions has been investigated using the maximum bubble pressure method. The surface tension is measured as a function of concentration at room (23°C) and elevated (80°C) temperatures. The critical micelle concentration (c.m.c.) of each surfactant is calculated from their respective equilibrium adsorption isotherms. The dynamic surface tension measurements are obtained at a surface age of 50 ms, which simulates conditions typically encountered during nucleate boiling of water. Two anionic surfactants, Sodium Dodecyl Sulfate (SDS) and Sodium Lauryl Ether Sulfate (SLES), two cationic surfactants Dodecyl Trimethyl Ammonium Chloride (DTAC) and Ethoquad O12/PG, and one non-ionic surfactant Triton X-100 have been used. SLES, Ethoquad O12/PG and Triton X-100 have, respectively, 3, 2, and 9–10 degrees of ethoxylation, which tends to alter the interfacial rheology. The σ–C isotherms show marked variation based on the surfactant ionic nature and the number of ethoxy groups present, along with the effects of temperature, with considerably less surface relaxation under dynamic conditions compared to those at equilibrium.

scholarly journals Non-equilibrium surface tension of the vapour-liquid interface of active Lennard-Jones particles

2017 ◽  
Vol 147 (8) ◽  
pp. 084902 ◽  
Author(s):  
Siddharth Paliwal ◽  
Vasileios Prymidis ◽  
Laura Filion ◽  
Marjolein Dijkstra
Keyword(s):  
Surface Tension ◽  
Liquid Interface ◽  
Equilibrium Surface ◽  
Lennard Jones ◽  
Equilibrium Surface Tension ◽  
Non Equilibrium

Surface tension and pulmonary compliance in premature rabbits

1989 ◽  
Vol 66 (5) ◽  
pp. 2039-2044 ◽  
Author(s):  
M. R. Mercurio ◽  
J. M. Fiascone ◽  
D. M. Lima ◽  
H. C. Jacobs
Keyword(s):  
Surface Tension ◽  
Surface Properties ◽  
Pulmonary Surfactant ◽  
Dynamic Compliance ◽  
Ringer Solution ◽  
Tween 20 ◽  
Adult Rabbit ◽  
Equilibrium Surface ◽  
Equilibrium Surface Tension ◽  
Pulmonary Compliance

In vitro surface properties of pulmonary surfactant thought to be essential to its ability to increase pulmonary compliance include minimum surface tension less than 10 dyn/cm and large surface tension variability and hysteresis. We tested four surface-active agents (Tween 20, a detergent; and FC-100, FC-430, and FC-431, industrial fluorocarbons), all lacking these properties, for their ability to increase pulmonary compliance in surfactant-deficient premature rabbits. Fetal rabbits were delivered by cesarean section at 27 days (full term = 31 days) and injected via tracheostomy with 50% lactated Ringer solution, adult rabbit surfactant, or one of the four experimental agents. Dynamic compliance was measured using 1 h of mechanical ventilation followed by alveolar lavage. Each experimental agent produced a dynamic compliance significantly higher than 50% lactated Ringer solution and statistically equal to or greater than natural surfactant. Equilibrium surface tension of the agents and minimum and equilibrium surface tension of the alveolar washes each correlated with compliance (P less than 0.05). This suggests that some surface properties of pulmonary surfactant believed to be essential are not, although surface tension does seem to play a role in pulmonary compliance.

Preparation and Properties of Amide Surfactants

2012 ◽  
Vol 550-553 ◽  
pp. 99-102
Author(s):  
Bao Cai Xu ◽  
Gui Ju Zhang ◽  
Yun Xia Li ◽  
Lu Cui
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Surface Activity ◽  
Surface Tensions ◽  
Equilibrium Surface ◽  
Minimum Surface Tension ◽  
Dilute Aqueous Solutions ◽  
Lipophilic Groups ◽  
Long Chain

Amide surfactants have modified structures with lipophilic groups connecting hydrophilic groups through amido bond. The preparation of three families of amide surfactants including long chain N-acyl sarcosinates, amidopropyl dimethyl hydroxypropyl sulfobetaines and lauryl amidopropyl trimethyl ammoniums were discussed. The study of the surface activity of these compounds by measuring the equilibrium surface tensions of their dilute aqueous solutions were described. The minimum surface tension and the critical micelle concentration values of these compounds are given.

Estimation of non-equilibrium surface tension

1971 ◽  
Vol 27 (3) ◽  
pp. 411-418 ◽  
Author(s):  
Craig Maze ◽  
George Burnet
Keyword(s):  
Surface Tension ◽  
Equilibrium Surface ◽  
Equilibrium Surface Tension ◽  
Non Equilibrium
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