Novel Structural Increments for Estimating the Krafft Temperature of Ionic Surfactants in Aqueous Solutions

2020 ◽  
Vol 23 (6) ◽  
pp. 1087-1098
Author(s):  
Ryszard Zieliński
Keyword(s):  
Aqueous Solutions ◽  
Ionic Surfactants ◽  
Krafft Temperature ◽  
Structural Increments

Adsorption of sodium cyclododecylmethanoate and cycloundecylmethanoate at the air/water interface

1984 ◽  
Vol 62 (11) ◽  
pp. 2359-2363 ◽  
Author(s):  
Jan J. Spitzer
Keyword(s):  
Aqueous Solutions ◽  
Sodium Ion ◽  
Ion Concentration ◽  
Ionic Surfactants ◽  
Free Energies ◽  
Straight Chain ◽  
Double Chain ◽  
Adsorbed State ◽  
Critical Micelle Concentrations ◽  
Air Water Interface

Surface tension measurements on aqueous solutions of sodium cyclododecylmethanoate and sodium cycloundecylmethanoate in sodium carbonate/bicarbonate buffers and at constant sodium ion concentration at 25 °C were used to obtain the standard free energies of adsorption, the saturation areas per surfactant ion, and the critical "micelle" concentrations of these compounds. Similar measurements were done for solutions of sodium dodecanoate for comparisons.The standard free energies of adsorption of CH2 group that is located in a macrocyclic cycloalkyl ring appears to follow the "rule of two" (−RT ln 2) that is also valid for straight chain ionic surfactants. The saturation areas of both cyclododecylmethanoate and cycloundecylmethanoate are about 52 Å2/ion as compared to about 32 Å2/ion for normal dodecanoate.For large ring cycloalkylmethanoates the critical "micelle" concentrations appear to decrease by a factor of about 4/5 for each CH2 group added to the ring as compared to the factor of about 1/2 for each CH2 group added to the chain of normal alkanoates. The data suggest that large cycloalkyl rings have "collapsed ring", or "double chain", conformation in aqueous solutions and in the adsorbed state.

Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

2018 ◽  
Vol 39 (23) ◽  
pp. 2997-3005 ◽  
Author(s):  
Jakub Tuček ◽  
Zdeněk Slouka ◽  
Michal Přibyl
Keyword(s):  
Electric Field ◽  
Aqueous Solutions ◽  
Ionic Surfactants

On the Interaction of Insoluble Alkyl Alcohol Monolayers with Aqueous Solutions of Ionic Surfactants

1980 ◽  
Vol 35 (12) ◽  
pp. 1395-1401
Author(s):  
H.-F. Eicke ◽  
M. K. Sharma
Keyword(s):  
Aqueous Solutions ◽  
Surfactant Concentration ◽  
Critical Concentration ◽  
Sodium Dodecyl ◽  
Ionic Surfactants ◽  
Conductivity Measurements ◽  
Surfactant Aggregates ◽  
Film Balance ◽  
Intermediate Surface ◽  
Alcohol Monolayers

Abstract The interaction between so-called alkyl alcohol (C5-C8) monolayers and aqueous solutions of ionic surfactants with different hydrophilic properties, i.e. calcium di-2-ethylhexyl sulfosuccinate and sodium dodecyl sulfate, has been studied with the help of a Langmuir-Adam film balance. A decrease or increase in surface pressure of the alkyl alcohol monolayers with the addition of surfactants is observed. The shift of the critical concentration (cmc) to increasing surfactant concentration occurs at intermediate surface pressures. This is interpreted as due to the formation of mixed alcohol-surfactant aggregates. The maximum of the cmc as a function of the pressure can be explained by a thermodynamic treatment assuming competition between a pressure dependent solubility of alcohol molecules and the formation of mixed alcohol surfactant complexes. The amount of alkyl alcohol required to react with the surfactant has been evaluated at different surface pressures, which shows values similar to those known from cosurfactant studies in the bulk phase. Critical micelle concentrations of the surfactants were verified by conductivity measurements.

Flotation properties of celestite in aqueous solutions of ionic surfactants

1989 ◽  
Vol 26 (1-2) ◽  
pp. 51-63 ◽  
Author(s):  
F. González-Caballero ◽  
M.A. Cabrerizo ◽  
J.M. Bruque ◽  
A. Delgado
Keyword(s):  
Aqueous Solutions ◽  
Ionic Surfactants

EFFECTS OF NH4Cl ON THE INTERACTION BETWEEN POLY(ETHYLENE OXIDE) AND IONIC SURFACTANTS IN AQUEOUS SOLUTIONS

2008 ◽  
Vol 26 (01) ◽  
pp. 31 ◽  
Author(s):  
Jing Li ◽  
Hua-zhen Li ◽  
Hai-yang Yang ◽  
Ping-ping Zhu ◽  
Ping-sheng He
Keyword(s):  
Ethylene Oxide ◽  
Aqueous Solutions ◽  
Ionic Surfactants ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Formamide, a water substitute. 12. Krafft temperature and micelle formation of ionic surfactants in formamide

1986 ◽  
Vol 90 (22) ◽  
pp. 5870-5872 ◽  
Author(s):  
I. Rico ◽  
A. Lattes
Keyword(s):  
Micelle Formation ◽  
Ionic Surfactants ◽  
Krafft Temperature

scholarly journals PREPARATION OF OLIVE OIL EMULSIONS IN AQUEOUS SOLUTIONS STABILIZED BY OC-20 AND SPAN-60

2020 ◽  
pp. 137-142
Author(s):  
Дарья Алексеевна Портнова ◽  
Виолетта Андреевна Веролайнен ◽  
Светлана Анатольевна Темникова
Keyword(s):  
Aqueous Solutions ◽  
Olive Oil ◽  
Phase Inversion ◽  
Sorbitan Monostearate ◽  
Ionic Surfactants ◽  
Oil In Water ◽  
Oil Emulsions ◽  
Span 60

Методом определения температуры инверсии фаз (ТИФ) получены и исследованы обратные эмульсии оливкового масла в воде с применением в качестве стабилизаторов неионогенных поверхностноактивных веществ синтанола OC-20, сорбитана моностеарата Span 60 и их смесей. Reverse emulsions of olive oil in water with the use of non-ionic surfactants syntanol OC-20, sorbitan monostearate Span 60 and their mixtures as stabilizers were obtained and studied by the method of determining the temperature of phase inversion (TIF).

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