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Surface Behavior of Aqueous Solutions of Sodium Lauryl Ether Sulfate, Additives and Their Mixtures: Experimental and Modeling Study

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Abstract

The surface tensions of aqueous solutions of sodium lauryl ether sulfate (SLES), ethanol, acetonitrile, 1-propanol and 2-propanol were individually measured using the pendant drop technique. Then, the surface tensions and critical micelle concentrations of the mixed aqueous solutions of (SLES + additives) were then measured at different concentrations of species for the first time. All measurements were conducted at the temperature of 298.15 K. In addition, a thermodynamic model was presented for accurately predicting of the surface tensions of the mixtures and the surface coverage of the surfactant in the mixture with the average absolute deviation of 1.45 %. Furthermore, an increase in the SLES concentration led to a higher surface coverage, although the presence of an additive caused a slight decrease in the surface coverage of SLES and an increase in the critical micelle concentration of the mixtures.

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Abbreviations

a:

Interaction parameter

AAD:

Average absolute deviation

b:

Surface-to-solution distribution constant

c:

Concentration

de :

Maximum diameter of the droplet

ds :

Small droplet diameter

g:

Gravitational constant

H:

Shape factor of a droplet

R:

Ideal gas constant

T:

Temperature

V:

Molar volume

x :

Mole fraction

α:

Bulk phase

γ:

Activity coefficient

Γ:

Surface excess

θ:

Surface coverage

\( \mu_{{\text{i}}} \) :

Chemical potential of component i

π:

Surface pressure

ρ:

Density

σ:

Surface tension

Δ:

Difference

ω:

Molar area

b:

Bulk

c:

Critical

calc:

Calculation

exp:

Experimental

i:

Component i

S:

Surface

0:

Water

1:

Surfactant or additive

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Authors and Affiliations

  1. Iranian Institute of Research & Development in Chemical Industries, Tehran, Iran

    Shahin Khosharay

  2. School of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, Iran

    Mahsa Rahmanzadeh & Bahman ZareNezhad

Authors
  1. Shahin Khosharay
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  2. Mahsa Rahmanzadeh
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  3. Bahman ZareNezhad
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Correspondence to Shahin Khosharay.

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Khosharay, S., Rahmanzadeh, M. & ZareNezhad, B. Surface Behavior of Aqueous Solutions of Sodium Lauryl Ether Sulfate, Additives and Their Mixtures: Experimental and Modeling Study. Int J Thermophys 41, 166 (2020). https://doi.org/10.1007/s10765-020-02738-0

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