Adsorption of surfactants and polymers at the solid-liquid interface

Somasundaran, P.; Krishnakumar, S.

doi:10.1016/s0927-7757(96)03829-0

Cited by 272 publications

(227 citation statements)

References 23 publications

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“…They exhibit high surface activity. They can form micelles and liquid crystalline structures both at the interface and in the bulk phase [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The ample experimental material makes it possible to predict the effect of the structure of a compound and the share of the hydrophilic and hydrophobic parts on adsorption properties [27,28,[31][32][33].…”

Section: Resultsmentioning

confidence: 99%

“…They can form micelles and liquid crystalline structures both at the interface and in the bulk phase [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The ample experimental material makes it possible to predict the effect of the structure of a compound and the share of the hydrophilic and hydrophobic parts on adsorption properties [27,28,[31][32][33]. An increase in the hydrophobic part generally brings about a considerable increase in the excess values and a decrease in the critical concentration of surface and bulk micelles [17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Resultsmentioning

confidence: 99%

“…The ample experimental material makes it possible to predict the effect of the structure of a compound and the share of the hydrophilic and hydrophobic parts on adsorption properties [27,28,[31][32][33]. An increase in the hydrophobic part generally brings about a considerable increase in the excess values and a decrease in the critical concentration of surface and bulk micelles [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. According to Traube's rule, an alkyl chain growth by a CH 2 group causes a threefold reduction in CMC and CSAC [24], but a growth of the hydrophilic part results in a decrease in the amount of the adsorbed compound and a shift in the values of CMC and CSAC towards higher concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…According to Traube's rule, an alkyl chain growth by a CH 2 group causes a threefold reduction in CMC and CSAC [24], but a growth of the hydrophilic part results in a decrease in the amount of the adsorbed compound and a shift in the values of CMC and CSAC towards higher concentrations. The dependences can be connected with an increase in solubility together with a growth of the hydrophilic part [27,28].…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted in this context that two factors affect the composition and structure of the surface phase: (a) the enthalpy connected to interactions of the surfactant with the surface and the solvent and (b) the entropy connected to the spatial arrangement of individual functional groups [28].…”

Section: Micellar Solutions Of Alkyl Sulfatesmentioning

confidence: 99%

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The Effect of Concentration on Lubricating Properties of Aqueous Solutions of Sodium Lauryl Sulfate and Ethoxylated Sodium Lauryl Sulfate

2010

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The objective of this study was to formulate new ecological lubricating substances, primarily water-based, and to verify their tribological and physicochemical properties. Initially, simple binary solutions were investigated. Then, various additives were added depending on application targets. Two alkyl sulfates were selected as additives modifying lubricating properties of water: sodium lauryl sulfate (SLS) and ethoxylated sodium lauryl sulfate (ESLS). They have an identical hydrophobic part in the form of an alkyl chain consisting of 12 carbon atoms. The SO 4 2-anion forms the hydrophilic part in SLS molecules, whereas an ESLS molecule also contains two mers of ethylene oxide which cause an increase in its hydrophilicity relative to SLS. Both SLS and ESLS exhibit high surface activity measured by their surface tension. Micelles form in aqueous solutions of alkyl sulfates at low concentrations of the order of 1%, whereas the presence of liquid crystalline phases can be found at the concentrations of 40 and 70%. High surface activity and formation of structures in the solutions (micelles, mesophases) formed the basis for application of the compounds as additives modifying lubricating properties. Tribological properties of aqueous solutions of alkyl sulfates were verified with a four-ball machine (T02 tester) at a constant load of 2 kN. The values of friction coefficient (l) were a measure of motion resistance, while the wear scar diameter (d) was a measure of wear. Alkyl sulfates significantly improve tribological properties of water. The coefficient of friction decreased sixfold and the wear scar diameter decreased by as much as twofold relative to the base. Non-monotonic changes in the tribological properties measured were observed as a function of concentration of additives. An attempt was made to relate those atypical changes with the presence of micelles and mesophases in both the surface phase and the bulk phase. In the model proposed the whole concentration range was divided into four areas in which tribological properties correspond well with physicochemical properties, particularly with the structures formed in solutions and at the interface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Micellar Solutions Of Alkyl Sulfatesmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Concentration on Lubricating Properties of Aqueous Solutions of Sodium Lauryl Sulfate and Ethoxylated Sodium Lauryl Sulfate

2010

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Adsorption of Polyethylene Glycol at the Interface of Dicalcium Silicate ‐ Sodium Aluminate Solution

Pan

LU³

et al. 2011

Light Metals 2011

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Interfacial energy for solutions of nanoparticles, surfactants, and electrolytes

Olayiwola

Dejam

2019

AIChE Journal

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The addition of surfactants to modify the surface property of nanoparticles (NPs) from hydrophilic to hydrophobic also enhances their interfacial properties. Several approaches were previously proposed to calculate the surface tension/interfacial tension (IFT) for different systems in the presence of NPs, surfactants, and electrolytes. However, most of these approaches are indirect and require several measured parameters. Therefore, a mathematical model is developed here to calculate the surface tension/IFT for these systems. The developed model takes into account the cohesive energy due to the interaction of the surfactant CH2 groups, the electric double layer effect due to the interaction among the ions of NPs, surfactants, and electrolytes, and the dipole–dipole interaction of NPs and electrolytes. The developed model is compared and validated with the laboratory experimental data in literature. The results reveal further understanding of the mechanisms involved in stabilization of oil/water emulsion in the presence of NPs, surfactants, and electrolytes.

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Adsorption of surfactants and polymers at the solid-liquid interface

Cited by 272 publications

References 23 publications

The Effect of Concentration on Lubricating Properties of Aqueous Solutions of Sodium Lauryl Sulfate and Ethoxylated Sodium Lauryl Sulfate

The Effect of Concentration on Lubricating Properties of Aqueous Solutions of Sodium Lauryl Sulfate and Ethoxylated Sodium Lauryl Sulfate

Adsorption of Polyethylene Glycol at the Interface of Dicalcium Silicate ‐ Sodium Aluminate Solution

Interfacial energy for solutions of nanoparticles, surfactants, and electrolytes

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