Thermodynamics of adsorption of ionic surfactants at water/alkane interfaces

Fainerman, V. B.; Aksenenko, E. V.; Mucic, N.; Javadi, Aliyar; Miller, R.

doi:10.1039/c4sm00463a

Cited by 39 publications

(41 citation statements)

References 71 publications

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“…The interfacial tension decreases with bulk surfactant concentration until it reaches a plateau at the critical micellar concentration (CMC). 42 We find CMC = 0.9 mmol•L −1 , in agreement with values from literature for CTAB with no added salt. 41,43 Data from literature show that sorption equilibrium between CTAB in the bulk at concentration C and at the oil/water interface (surface concentration Γ i ) is well described by a Langmuir isotherm and Gibbs equation.…”

Section: ■ Experimental Sectionsupporting

confidence: 91%

Dramatic Slowing Down of Oil/Water/Silica Contact Line Dynamics Driven by Cationic Surfactant Adsorption on the Solid

et al. 2021

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We report on the contact line dynamics of a triplephase system silica/oil/water. When oil advances onto silica within a water film squeezed between oil and silica, a rim forms in water and recedes at constant velocity. We evidence a sharp (three orders of magnitude) decrease of the contact line velocity upon the addition of cationic surfactants above a threshold concentration, which is slightly smaller than the critical micellar concentration. We show that, with or without surfactant, and within the range of small capillary numbers investigated, the contact line dynamics can be described by a friction term that does not reduce to pure hydrodynamical effects. In addition, we derive a model that successfully accounts for the selected contact line velocity of the rim. We further demonstrate the strong increase of the friction coefficient with surfactant bulk concentration results from the strongly nonlinear adsorption isotherm of surfactants on silica. From the variations of the friction coefficient and spreading parameter with surface concentration, we suggest a picture in which the part of the adsorbed surfactants that are strongly bound to the silica interface is trapped under the oil droplet and is responsible for the large increase in line friction.

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Section: ■ Experimental Sectionsupporting

confidence: 91%

Dramatic Slowing Down of Oil/Water/Silica Contact Line Dynamics Driven by Cationic Surfactant Adsorption on the Solid

et al. 2021

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“…The AEA is mainly a mixture of various surfactants. Its foaming capacity and foam stability mainly depend upon the adsorption and assembly of the hydrophilic and hydrophobic chains of surfactant molecules at the water-air interface [80,84,85]. However, the LAP environment in plateau areas greatly limits its surface activity.…”

Section: Improvement Techniquesmentioning

confidence: 99%

Impacts of Low Atmospheric Pressure on Properties of Cement Concrete in Plateau Areas: A Literature Review

et al. 2019

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Low atmospheric pressure (LAP) can enormously affect properties of cement concrete in plateau areas. There are fewer studies and attendances on this issue than those of cement concrete in normal atmospheric pressure (AP), because of the limitations of both environmental conditions and instruments. In order to improve properties of cement concrete under LAP, influences of LAP on properties of cement concrete were reviewed in this work. The influence rules and mechanism on properties of cement concrete were summarized. The corresponding mechanism and techniques were put forward for enhancing the properties of cement concrete. The results of researchers show that LAP can significantly reduce the air entraining ability of the air entraining agent (AEA). Air content in concrete linearly decreases with the decrease of AP when other conditions are constant. If the initial air content is high, the decrease rate of air content increases with the decrease of AP. When the initial air content in cement concretes is similar, the greater the slump of cement concrete, the stronger its resistance to the decrease of air content caused by the decrease of AP. In addition, the condition of the bubble characteristics of hardened cement concrete under LAP is worse than that under normal AP. Therefore, the change of concrete properties under LAP is mainly attributed to these bubble characteristics, such as air content, bubble spacing coefficient, bubble radius and bubble specific surface area. In this work, nano-silica (negative charges) with cationic oligomeric surfactants is recommended as a new type of AEA to optimize the bubble characteristics under LAP in plateau areas.

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“…Both surfactants are widely investigated at air/water and oil/water interfaces by tensiometry 6,7,[18][19][20][21][22][23] and by neutron reflectivity 15,24 techniques. The selected molecules SDS and CTAB are almost insoluble in the hydrocarbon phase.…”

Section: Single Ionic Surfactantmentioning

confidence: 99%

“…Experimental data are from Fainerman et al7 The solid lines are predicted values using eqn(14) (with a = 61 A 2 ). Experimental data are from Fainerman et al7 The solid lines are predicted values using eqn(14) (with a = 61 A 2 ).…”

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confidence: 99%

Interfacial equation of state for ionized surfactants at oil/water interfaces

Bahramian

Zarbakhsh

2015

Soft Matter

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A new mathematical approach has been developed for describing the interfacial behaviour of oil/water interfaces in the presence of ionic surfactants. The approach relies on the ideal behaviour of ionized surfactants at oil/water interfaces, which is previously demonstrated by Lucassen-Reynders (J. Phys. Chem., 1966, 70, 1777-1785). The new derived equation simply relates the interfacial tension to the surfactant molecular size and the cmc value of the surfactant in the aqueous phase. The predicted values are in a reasonable agreement with the measured experimental data. Formation of complex multi-layers is considered and the related development is performed. It is shown that, assuming a multi-layer interface, the proposed model gives an area per surfactant molecule similar to the values obtained by techniques such as neutron reflectivity (NR), while a monolayer assumption yields about half the value. The discussion describes the impact of dissolved oil and ionic components on the interfacial tension of the ionized surfactants at oil/water interfaces.

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Thermodynamics of adsorption of ionic surfactants at water/alkane interfaces

Cited by 39 publications

References 71 publications

Dramatic Slowing Down of Oil/Water/Silica Contact Line Dynamics Driven by Cationic Surfactant Adsorption on the Solid

Dramatic Slowing Down of Oil/Water/Silica Contact Line Dynamics Driven by Cationic Surfactant Adsorption on the Solid

Impacts of Low Atmospheric Pressure on Properties of Cement Concrete in Plateau Areas: A Literature Review

Interfacial equation of state for ionized surfactants at oil/water interfaces

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