Apparent molal volumes and heat capacities of ionic surfactants in water at 25°C

Musbally, G. M.; Perron, Gérald; Desnoyers, Jacques E.

doi:10.1016/0021-9797(74)90194-5

Cited by 138 publications

(79 citation statements)

References 30 publications

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“…The AV,, values for the sulfoacetates are reasonable when compared to literature values of one-tail surfactants of comparable chain length (23,25). The positive value of AV, for surfactants is generally observed and is attributed to the loss of hydrocarbon-water contact with the transfer of the surfactant molecule from bulk water to the micelle.…”

Section: Resultssupporting

confidence: 81%

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Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water

Jobe¹,

Reinsborough²

1984

Can. J. Chem.

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. Can. J. Chem. 62, 280 (1984). Viscosity, conductivity, density, and fluorescence quenching studies were conducted in aqueous micellar solutions at 25.0°C of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in a comparison of one-tailed and two-tailed surfactant systems. The hexyl, octyl, and decyl members of the former group and the dihexyl and dioctyl members of the latter group were investigated. The results indicated that the sulfoacetates most likely form spherical micelles with aggregation numbers 20 for hexyl, 42 for octyl, and 70 for decyl with three methods for size determination giving concordant results. For the sulfosuccinates, the aggregation numbers from fluorescence quenching were 38 for the dihexyl and 56 for the dioctyl in agreement with the results from the conductance technique which means that spherical micelles are likely formed also. Volume changes on micellization were obtained for the sulfoacetates. [Traduit par le journal]

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Section: Resultssupporting

confidence: 81%

“…Apparent molal volumes (4,) were calculated from the density data (9,23) for each of the surfactant systems. Plots of 4, -1.868c1I2 against molarity for both the sulfoacetates and sulfosuccinates gave curves typical of micelle formers (Fig.…”

Section: Resultsmentioning

confidence: 99%

Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water

Jobe¹,

Reinsborough²

1984

Can. J. Chem.

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“…7), giving a value of 8 cm3 mol-' for AVO calculated from the slope. This is remarkably close to 6.3 f 1.0 cm3 mol-I, the AVO value for the SOS system from density studies (20), given all the assumptions involved. Since the straight line has a non-zero intercept, the analysis may admit of a constant error which cancels when the slope is taken.…”

Section: Discussionmentioning

confidence: 59%

Solubilization sites in micellar sodium octylsulphate solutions by ultrasonic spectroscopy

Jobe¹,

Reinsborough²,

White³

1982

Can. J. Chem.

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. Can. J. Chem. 60, 279 (1982). Relaxation frequencies ,f, and amplitudes A were measured ultrasonically over the 3.5-52.5 MHz range at 25°C for the fast exchange of monomer between micelles and bulk solution in micellar sodium octylsulfate solutions with solubilizates present in small amounts. The additives were cyclohexane, pyridine-2-azo-p-dimethylaniline (PADA), benzene. toluene, andp-xylene. Only cyclohexane produced no changes in f, or A . The variations in the relaxationai parameters suggested that cyclohexane was situated within the micellar core and PADA, primarily in the surface region of the micelle. Benzene and toluene were adsorbed in minute quantities into the micelle surface but, with additive concentrations beyond a few molecules per micelle, were found principally in the micellar core. Toluene, along with p-xylene, showed an initial dip in fc that may indicate that the first few molecules of these additives were incorporated into the palisade layer of the rnicelle. Chem. 60, 279 (1982). On a mesure par ultrason a des frequences allant de 3,5 a 52,5 MHz et a 25'C les frequences de relaxation fc et les amplitudes A de I'echange rapide de monomere entre les micelles et la solution dans des solutions miceliaires d'octylsulfate de sodium ayant des petites quantites de solubilisants. On a utilise comme additifs: le cyclohexane, la pyridine-azo-2 dimethylaniline (PADA), le benzene, le toluene et lep-xylene. Le cyclohexane est le seul a ne pas influencer les frequences de relaxation et les amplitudes. Les variations des parametres de relaxation suggerent que le cyclohexane est situe dans la masse micellaire alors que la PADA se trouve de f a~o n primaire dans la region de la surface de la micelle. Le benzene et le toluene sont adsorbes en petites quantites dans la surface de la micelle mais, a des concentrations croissantes de I'ordre de quelques molecules par micelle, on les a trouve principalement dans le noyau micellaire. Le toluene ainsi que le xylene revelent une diminution initiale de f, qui indique que les quelques premieres molecules de ces additifs sont incorporees dans la couche protectrice de la micelle.[Traduit par le journal]

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“…The CMC is typically a very small concentration on the order of a few mM; therefore, below the CMC many bulk properties such as viscosity, thermal conductivity, specific heat, and saturation temperature are virtually unaffected [4,[7][8][9]. For instance, boiling point elevation was calculated to be 2 × 10 −4 K for Triton X-100 at the CMC using the Clausius-Clapeyron relation and Raoult's Law.…”

Section: Theorymentioning

confidence: 99%

Understanding Enhanced Boiling With Triton X Surfactants

Cho

Sresht

Blankschtein

et al. 2013

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer In

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Heat transfer performance in pool boiling is largely dictated by bubble growth, departure, and number of nucleation sites. It is a well known phenomenon that adding surfactants can lower the liquid-vapor surface tension and increase the bubble departure frequency, thereby enhancing heat transfer. In addition to faster departure rates, surfactants are observed to dramatically increase the number of nucleation sites, which cannot be explained by simple surface tension arguments. Furthermore, it is not well understood which surfactant properties such as chemical composition and molecular structure affect boiling most significantly. From our experiments using Triton X-100 and Triton X-114 nonionic surfactants, we attribute boiling enhancement mainly to adsorption to the solid-liquid interface. Using the Mikic-Rohsenow model for boiling, a simple linear adsorption model, and the Cassie-Baxter description for contact angle, we developed a model that shows agreement with experimental results. This work offers some insights on how to predict boiling enhancement based on surfactant chemistry alone, which may aid in choosing optimal surfactants for boiling in the future.

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Apparent molal volumes and heat capacities of ionic surfactants in water at 25°C

Cited by 138 publications

References 30 publications

Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water

Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water

Solubilization sites in micellar sodium octylsulphate solutions by ultrasonic spectroscopy

Understanding Enhanced Boiling With Triton X Surfactants

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