Structure of the mixed cationic–non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface

Penfold, J.; Staples, E.; Cummins, P. G.; Tucker, I.; Thomas, Robert K.; Simister, E. A.; Lu, Jian R.

doi:10.1039/ft9969201549

Cited by 18 publications

(22 citation statements)

References 15 publications

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“…In experiments on benzyl alcohol with C 16 TAB at the air/water interface, it was observed that the relative positions of the volume fraction distributions are not too different [37]. Also, experiments on C 16 TAB and C 12 E 6 show similar positions of the volume fraction distribution at the air/water interface for both surfactants [38]. In other experiments on dodecane and C 12 TAB, that the C 12 TAB is slightly deeper into the solvent [36].…”

Section: Density Profile Head Group and Hydrocarbon Chain Lengthmentioning

confidence: 86%

Computer simulation studies of surfactant monolayer mixtures at the water/oil interface: charge distribution effects

Domínguez

2004

Journal of Colloid and Interface Science

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Section: Density Profile Head Group and Hydrocarbon Chain Lengthmentioning

confidence: 86%

Computer simulation studies of surfactant monolayer mixtures at the water/oil interface: charge distribution effects

Domínguez

2004

Journal of Colloid and Interface Science

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“…The most important ones include: surface tension measurements, ellipsometry, atomic force microscopy (AFM), X-ray and neutron scattering, NMR spectroscopy, and colorimetric methods [34][35][36][37][38][39][40][41][42][43]. The method used to determine adsorbability of two alkyl sulfates from their aqueous solutions was the measurement of surface tension whose measure was a force needed to detach a ring-shaped platinum wire from the surface of a liquid.…”

Section: Resultsmentioning

confidence: 99%

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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“…This approach has been used extensively by us to determine the structure of surfactant monolayers (21) and mixed monolayers (7,22) to a resolution ∼1-2Å.…”

Section: Methodsmentioning

confidence: 99%

“…[7] are characterized by six parameters: the width of the alkyl chain fragments and solvent σ c1 , σ c2 , and ζ s and their relative positions, δ c1s , δ c2s , and δ c1c2 (the bulk solvent density, n o , and the area per molecule or adsorbed amount of the surfactant are known). The ± sign in Eqs.…”

Section: (2) Structure Of the Mixed C 16 Tab/phenyl Ethanol Monolayermentioning

confidence: 99%

Comparison of the Coadsorption of Benzyl Alcohol and Phenyl Ethanol with the Cationic Surfactant, Hexadecyl Trimethyl Ammonium Bromide, at the Air–Water Interface

Penfold

Staples

Tucker

et al. 2002

Journal of Colloid and Interface Science

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Structure of the mixed cationic–non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface

Cited by 18 publications

References 15 publications

Computer simulation studies of surfactant monolayer mixtures at the water/oil interface: charge distribution effects

Computer simulation studies of surfactant monolayer mixtures at the water/oil interface: charge distribution effects

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

Comparison of the Coadsorption of Benzyl Alcohol and Phenyl Ethanol with the Cationic Surfactant, Hexadecyl Trimethyl Ammonium Bromide, at the Air–Water Interface

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