Interfacial Tension of Toluene + Water + Sodium Dodecyl Sulfate from (20 to 50) °C and pH between 4 and 9

Saien, Javad; Akbari, Saeed

doi:10.1021/je060204g

Cited by 96 publications

(106 citation statements)

References 10 publications

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“…Samples were shaken for 4 h to assure equilibrium state at the interface. The measurements were carried out at 25 • C. Measurements are in general accordance to other works [85,86]. The fit goodness, measured as a square error, for the isotherm equals 4.367 × 10 −6 which gives about 2 mN/m isotherm mean deviation from the experimental values.…”

Section: Experimental Partsupporting

confidence: 58%

Superficial transportation model using finite volume method

Staszak

2018

Theor. Comput. Fluid Dyn.

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The work presents a new modeling technique designed for transporting selected property while simultaneously tracking particular value of certain field variable. The model addresses the problem of transportation of superficial properties according to fluid/fluid interface evolution. Such problem arises when some superficial variable needs to be attached to the evolving interface or front defined. Several multiphase models in CFD technique lack such ability. The model proposed is illustrated by the experimental two phase system of toluene/water with surfactant specie (sodium dodecylsulfate SDS). The selected superficial property that is important to be tracked according to interface evolution is Gibbs surface excess. The computation was performed using Ansys/Fluent software with proposed models created and attached using C programming language. Keywords Interface mass transfer · Adsorption · Liquid-liquid interfaces · Fluid dynamics List of symbols

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Section: Experimental Partsupporting

confidence: 58%

Superficial transportation model using finite volume method

Staszak

2018

Theor. Comput. Fluid Dyn.

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“…The physical properties were measured with a self-adjustable temperature density-meter (Anton Parr DMA 4500) for measuring density and an Ostwald viscometer for measuring viscosity. Due to the variation of interfacial tension with pH [11], the corresponding values were considered for each solution having the appropriate pH value; meanwhile, the variation in viscosity was negligible since it was decreased only 3% within the ranges used. Organic and aqueous molecular diffusivities were applied from those reported by Baldauf and Knapp [27].…”

Section: Methodsmentioning

confidence: 99%

“…Table 2 lists the tip diameter of nozzles and the range of generated drop sizes for each direction of mass transfer. The size of each drop, formed at the tip of nozzles, is influenced by increasing in pH, mainly due to the decrease of interfacial tension [11].…”

Section: Methodsmentioning

confidence: 99%

“…Like contaminants, the hydroxyl ion may therefore act in several ways, such as by reducing interfacial tension and so changing any balance of drop formation leading to a change in average drop size and hence mass transfer coefficient by making the interface more structured. The hydroxyl ions can also exert an interfacial barrier layer due to their adsorption, leading to hydrodynamic revolutions in lowering interfacial mobilization [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Modelling mass transfer coefficient for liquid-liquid extraction with the interface adsorption of hydroxyl ions

Saien

Daliri

2009

Korean J. Chem. Eng.

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A combined model was used for prediction of overall mass transfer coefficient of drops in the liquid-liquid extraction process, prone to the deleterious effect of adsorbed hydroxyl ions onto the interface. The importance is due to the use of different pH waters as aqueous phase. The work is based on single drop experiments with a chemical system of toluene-acetone-water where the pH of the continuous aqueous phase was within the range 5.5-8, appropriate to most industrial waters, and can lead to rigid behavior of circulating drops. The combined model in conjunction with the correlation developed here for the ratio of interfacial velocity to drop terminal velocity that links the film mass transfer coefficients of both sides can be used satisfactorily for design purposes. This model gives a maximum relative deviation of less than ±10% for the mass transfer directions of dispersed to continuous phase and vice versa.

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“…A su vez, el SDS tiene alto valor de solubilidad en agua lo cual expresa su alto nivel hidrofílico [4]. Experimentalmente, se ha estudiado la adsorción de SDS en las regiones interfaciales aire/aceite, aire/agua [5][6][7] y agua/grafito usando espectroscopía de frecuencia vibracional, reflactancia de neutrones y microscopía de fuerza atómica con la finalidad de estimar la orientación molecular de los surfactantes en la región interfacial [8,9]. Además, el SDS tiene la capacidad de reducir la tensión interfacial de sistemas vapor/agua desde 72 hasta 39 mN/m para altas concentraciones en agua y en sistemas agua/aceite como agua/hexadecano desde 52 hasta 10 mN/m [5,6].…”

Section: Introductionunclassified

Comportamiento del SDS localizado en la región interfacial del sistema agua/n-octano. Un estudio usando dinámica molecular

Parra

Aray

2016

Av. Cienc. Ing. (Quito)

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Behaviour of the SDS located at the interfacial region of the water/n-octane system.A study using molecular dynamics. AbstractIn this paper, molecular dynamics simulations was used to determine the interfacial properties and behavior of Sodium Dodecyl Sulfate (SDS) located at the interfacial region of the vacuum/water and water/n-octane systems. The interfacial tension was estimated with the model proposed by Kirkwood and Buff [23]. In turn, to determine the interfacial film thickness were used the criteria 10-90 and 90-90. Also, the area per molecule was calculated with the variation of the surface pressure in function of concentration of the surfactant. Moreover, the values of area per molecule of SDS in water estimated with two procedure differents. The obtained values were 53.3 Å 2 and 54.3 Å 2 , respectively . Finally, for water/n-octane and water/sds/n-octane systems the thickness of the interfacial film increase in function of the number of molecules of surfactants present in the interfacial region. The results are consistent with experimental values.Keywords. Molecular Dynamic, interfacial film thickness,interfacial tension. ResumenEn este trabajo, usando dinámica molecular se determinaron las propiedades interfaciales y el comportamiento del Dodecil Sulfato de Sodio (SDS) ubicado en la región interfacial de los sistemas vacío/agua y agua/n-octano. La tensión interfacial fue estimada con el modelo propuesto por Kirkwood y Buff [23]. A su vez, los espesores de película interfacial fueron determinados usando los criterios 10-90 y 90-90. Además, el área por molécula fue estimado con la variación de la presión superficial en función de la concentración del surfactante. En los sistemas vacío/SDS/agua, el área por molécula del SDS fue obtenida con dos procedimientos diferentes. Los valores fueron 53.3 Å 2 y 54.3 Å 2 , respectivamente. Para los sistemas agua/n-octano y agua/SDS/n-octano, los espesores de película interfacial aumentan en función del número de moléculas de surfactantes presentes en la región interfacial. Los resultados obtenidos son consistentes con datos medidos por experimentación.

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Interfacial Tension of Toluene + Water + Sodium Dodecyl Sulfate from (20 to 50) °C and pH between 4 and 9

Cited by 96 publications

References 10 publications

Superficial transportation model using finite volume method

Superficial transportation model using finite volume method

Modelling mass transfer coefficient for liquid-liquid extraction with the interface adsorption of hydroxyl ions

Comportamiento del SDS localizado en la región interfacial del sistema agua/n-octano. Un estudio usando dinámica molecular

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