Effect of water hardness on surface tension and dilational visco-elasticity of sodium dodecyl sulphate solutions

[Display omitted] ► The surface activity of SDS is increased due to presence of bivalent ions. ► In presence of bivalent ions double chain surfactants like Ca(DS)2 can be formed. ► The hydrolysis of SDS is enhanced in NaCl solutions, producing dodecanol. ► Bivalent ions further enhance the SDS hydro...

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Bibliographic Details
Published in:Journal of colloid and interface science Vol. 377; no. 1; pp. 1 - 6
Main Authors: Fainerman, V.B., Lylyk, S.V., Aksenenko, E.V., Kovalchuk, N.M., Kovalchuk, V.I., Petkov, J.T., Miller, R.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Inc 01.07.2012
Elsevier
Subjects:
adsorption
Aging
Bivalent ions
Bubbles
Buoyancy
calcium chloride
Calcium Chloride - chemistry
Chemistry
Dilational surface rheology
Dodecanol
Drop and bubble profile tensiometry
Dynamics of adsorption
Exact sciences and technology
General and physical chemistry
Hardness
hydrolysis
magnesium chloride
Magnesium Chloride - chemistry
Mathematical models
Maximum bubble pressure tensiometry
rheology
SDS
sodium chloride
sodium dodecyl sulfate
Sodium Dodecyl Sulfate - chemistry
Solutions
Surface physical chemistry
Surface Tension
Thermodynamic adsorption model
Viscoelastic Substances - chemistry
Viscoelasticity
Water - chemistry
Water hardness
Thermodynamic adsorption model
Dilational surface rheology
SDS
Maximum bubble pressure tensiometry
Bivalent ions
Dynamics of adsorption
Drop and bubble profile tensiometry
Water hardness
Water
Elasticity
Ionic surfactant
Maximum bubble pressure
Bubble
Thermodynamic model
Dynamics
Oscillation
Elastic modulus
Rheology
Ageing
Ions
Hardness
Lauryl sulfate
Drop
Hydrolysis
Dynamic surface tension
Anionic surfactant
Adsorption
Sodium
Isotherm
Frequency
Surface tension
Aqueous solution
Physicochemical properties
ISSN:0021-9797, 1095-7103, 1095-7103
Online Access:Get full text
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Summary:[Display omitted] ► The surface activity of SDS is increased due to presence of bivalent ions. ► In presence of bivalent ions double chain surfactants like Ca(DS)2 can be formed. ► The hydrolysis of SDS is enhanced in NaCl solutions, producing dodecanol. ► Bivalent ions further enhance the SDS hydrolysis in solution. ► SDS in hard water represents a multicomponent surfactant solution. The complementary drop and bubble profile analysis and maximum bubble pressure tensiometry are used to measure the dynamic surface tension of aqueous SDS solutions in the presence of hardness salts (CaCl2 and MgCl2 in the ratio of 2:1 at concentrations of 6 and 40FH). The presence of hardness salts results in an essential increase of the SDS adsorption activity, which indicates the formation of Ca(DS)2 and Mg(DS)2 in the SDS solutions. The surface tension isotherms of SDS in presence of Ca(DS)2 and Mg(DS)2 are described using the generalised Frumkin model. The presence of hardness salts accelerates the ageing of SDS solutions as compared with the addition of 0.01M NaCl due to a faster hydrolysis and hence formation of dodecanol. These results are used to estimate the possible concentration of dodecanol in the studied SDS solutions. The buoyant bubble profile method with harmonic surface oscillations is used to measure the dilational rheology of SDS solutions in presence of hardness salts in the frequency range between 0.005Hz and 0.2Hz. The visco-elasticity modulus in the presence of hardness salts is higher as compared with its values in the presence of 0.01M NaCl additions. The ageing of SDS solutions leads to an essential increase of the visco-elastic modulus.
Bibliography:http://dx.doi.org/10.1016/j.jcis.2012.03.030
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ISSN:0021-9797
1095-7103
1095-7103
DOI:10.1016/j.jcis.2012.03.030