Bulk and interfacial physical properties of aqueous solutions of sodium lauryl sulphate and lauryl alcohol. Part III: The effect of impurities and additives on pH and electrical conductance of premicellar and micellar solutions of sodium lauryl sulphate

Vijayan, S.; Woods, Donald R.; Lowe, D. M.

doi:10.1002/cjce.5450570413

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…Surface tension measurements [12] of cupferron solutions are similar to those of water. When the conductivities of cupfemn solutions of various concentrations were plotted against concentration, no inflexion was observed which would be a characteristic of micelle formation by a surfactant in water [28]. Hence, cupferron is not a surfactant and its collector property is only due to chemisoption.…”

Section: Review Of Flotation With Cupferron As Collectormentioning

confidence: 97%

Effect of substituent on the Performance of Cupferron as a Collector for Uranium

Nirdosh

Muthuswami

Natarajan

et al. 1994

Dev. Chem. Eng. Mineral Process.

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Section: Review Of Flotation With Cupferron As Collectormentioning

confidence: 97%

Effect of substituent on the Performance of Cupferron as a Collector for Uranium

Nirdosh

Muthuswami

Natarajan

et al. 1994

Dev. Chem. Eng. Mineral Process.

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“…Similar run have polytherms for SAA mixtures (for example, a mixture of alkyl sulfates differing in the alkyl chain lengths or a mixture of different salt forms of the given alkyl sulfate [10][11][12][13]) and, which is especially important, for mixtures of alkyl sulfates and primary fatty alcohols used in their synthesis. As shown previ- …”

mentioning

confidence: 99%

Colloid chemistry principles of separation of pure alkyl sulfates

Вережников

Germasheva

2012

Russ J Appl Chem

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Sodium dodecyl sulfate and other alkyl sulfates were treated by the method of polythermal conductometry to remove primary alcohols. The electrical conductivity polytherms were analyzed. The composition of the liquid and solid phases in equilibrium in the mixed solutions was determined. The method of the synthesis of chemical purity colloids of alkyl sulfates and other ionogenic micelle forming surfactants was suggested based on the optimal choice of crystallization temperature of the solutions.Modern scientifi c and high-technology areas (medicine, pharmacy, electronics, and nanotechnology) greatly need for high-purity surfactants (SAAs). One of the most common methods of the preparation of metallic nanoparticles uses surfactant micelles as unique nanoreactors responsible for the synthesis topochemistry and the size and morphology of the particles [1]. For preparing multimolecular layers, known as the Langmuir-Blodgett fi lms, the purity of SAAs is the particularly important parameter [2]. These nanosized planar structures arouse a wide scientifi c and practical interest.The development of regular multilayer construction technology with pre-programmed properties directly depends on progress in the development of controllable synthesis of high-purity surfactants. Meanwhile, practice shows that synthesis of high-purity surfactants, such as primary alkyl sulfates (one of the most commonly used and well-studied class of surfactants), encounters considerable diffi culties in removing impurities. Diffi culties in treating alkyl sulfates to remove primary alcohols have been reported elsewhere [3][4][5][6][7]. The same can be said about removal of tetradecyl alcohol from tetradecyl sulfate [3]; it retains even though the surface tension isotherm minimum, criterion of SAA purity, is lacking. Commercially pure sodium dodecyl sulfate always contains traces of dodecanol [7]. Traditional methods of the treatment (recrystallization, extraction, foam fractionation, and vacuum sublimation) do not often yield the desired result.It was shown that this arises from disregard of specifi city of SAAs as micellization systems and their ability to interact with the mixture components (primaryl alcohols in the case of alkyl sulfates).In the study, the effect exerted by micellization on the phase separation upon purifi cation of SAAs by crystallization from solutions was determined and a simple method was suggested for the synthesis of chemical purity colloids of alkyl sulfates, which satisfy to the requirements of modern high technology. EXPERIMENTAL Sodium dodecyl sulfate (AS-12) and sodium hexadecyl sulfate (AS-16) were synthesized from corresponding alcohols (chemical purity grade) by the method reported in [8]. The resulting products were purifi ed according to our method described in the fi nal part of the article. The electrical conductivity polytherms were obtained with a Р 5021conductometer at a heating rate not exceeding 0.5 deg min -1 at continuous agitation.

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Bulk and interfacial physical properties of aqueous solutions of sodium lauryl sulphate: Part IV: Dilute aqueous solution behavior by electron spin resonance studies and by pH and surface tension measurements

1980

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The electron spin resonance spectrum of the nitroxide label 2,2,6,6 – TetraMethyl – 4 – Piperidone – Oxide (TEMPO) has been investigated in aqueous solutions of a purified and commercially available impure samples of sodium lauryl sulphate (NaLS) for a wide range of concentrations. The spectra were recorded at 24°C as a function of surfactant concentration. The reorientational correlation times Tθ of the TEMPO label in aqueous solutions were calculated using the Kivelson's theory. Using the Tθ data qualitative analysis has been carried out in an attempt to understand the microscopic effects produced by the hydrophobic part of the surfactant on the water structure and the hydrophobic‐hydrophobic interactions in water. Four major discontinuities in the τθ results have been identified with the purified NaLS system. They are found to occur at NaLS concentrations of 0.008 wt.%, 0.015 wt.%, 0.23 and 1.73 wt.%. The latter two concentrations represent the first and the second critical micelle concentration (CMC) of the surfactant while the first two concentrations reveal the existence of premicellar association and dissociation processes, respectively. These discontinuities have been also confirmed by the pH data and by surface tension results from the du Noüy ring method. The effect of addition of lauryl alcohol and sodium chloride on τθ values was also studied. The additive action has been found to produce an additional discontinuity, corresponding to the mixture CMC, in the τθ versus concentration plot. Analysis of other effects such as solution aging and hydrolysis of NaLS are also included. The applicability of the spin labelling technique for the study of aqueous solution behavior of NaLS is discussed by comparing data reported in the literature.

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Bulk and interfacial physical properties of aqueous solutions of sodium lauryl sulphate and lauryl alcohol. Part III: The effect of impurities and additives on pH and electrical conductance of premicellar and micellar solutions of sodium lauryl sulphate

Cited by 13 publications

References 22 publications

Effect of substituent on the Performance of Cupferron as a Collector for Uranium

Effect of substituent on the Performance of Cupferron as a Collector for Uranium

Colloid chemistry principles of separation of pure alkyl sulfates

Bulk and interfacial physical properties of aqueous solutions of sodium lauryl sulphate: Part IV: Dilute aqueous solution behavior by electron spin resonance studies and by pH and surface tension measurements

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