Surface tension and adsorption kinetics of amphiphiles in aqueous solutions: The role of carbon chain length and temperature

Firooz, Abdolhamid; Chen, P.

doi:10.1016/j.jcis.2011.12.062

Cited by 22 publications

(16 citation statements)

References 50 publications

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“…5 for each model, the maximum surface excess value, C m = 7.75 Â 10 À6 mol/m 2 , was estimated for both models. Our value is in the same range found for the other different experiments, that are between $6-9 Â 10 À6 mol/m 2 with K L $ 2-5 m 3 /mol, such as PBS, Pendant Bubble/Wilhemly Plate and Oscilating Jet method as shown in Table 2 [15,16,19,54].…”

Section: Langmuir and Frumkin Adsorption Isotherm Model Fittingsupporting

confidence: 87%

New sensitive micro-measurements of dynamic surface tension and diffusion coefficients: Validated and tested for the adsorption of 1-Octanol at a microscopic air-water interface and its dissolution into water

Kinoshita

Parra

2017

Journal of Colloid and Interface Science

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Currently available dynamic surface tension (DST) measurement methods, such as Wilhelmy plate, droplet- or bubble-based methods, still have various experimental limitations such as the large size of the interface, convection in the solution, or a certain "dead time" at initial measurement. These limitations create inconsistencies for the kinetic analysis of surfactant adsorption/desorption, especially significant for ionic surfactants. Here, the "micropipette interfacial area-expansion method" was introduced and validated as a new DST measurement having a high enough sensitivity to detect diffusion controlled molecular adsorption at the air-water interfaces. To validate the new technique, the diffusion coefficient of 1-Octanol in water was investigated with existing models: the Ward Tordai model for the long time adsorption regime (1-100s), and the Langmuir and Frumkin adsorption isotherm models for surface excess concentration. We found that the measured diffusion coefficient of 1-Octanol, 7.2±0.8×10cm/s, showed excellent agreement with the result from an alternative method, "single microdroplet catching method", to measure the diffusion coefficient from diffusion-controlled microdroplet dissolution, 7.3±0.1×10cm/s. These new techniques for determining adsorption and diffusion coefficients can apply for a range of surface active molecules, especially the less-characterized ionic surfactants, and biological compounds such as lipids, peptides, and proteins.

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Section: Langmuir and Frumkin Adsorption Isotherm Model Fittingsupporting

confidence: 87%

New sensitive micro-measurements of dynamic surface tension and diffusion coefficients: Validated and tested for the adsorption of 1-Octanol at a microscopic air-water interface and its dissolution into water

Kinoshita

Parra

2017

Journal of Colloid and Interface Science

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“…The corresponding molecular area was calculated to be around 32 ± 2 Å 44,46 and thus prove that XPS is a reliable experimental technique to determine such values. The resulting packing density of 3-pentanol is from these values 68 % of the one of 1-pentanol.…”

Section: Surface Concentration and Molecular Area At ML Coveragementioning

confidence: 73%

Surface behavior of amphiphiles in aqueous solution: a comparison between different pentanol isomers

Walz

Caleman

Werner

et al. 2015

Phys. Chem. Chem. Phys.

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Position isomerism is ubiquitous in atmospheric oxidation reactions. Therefore, we have compared surface-active oxygenated amphiphilic isomers (1-and 3-pentanol) at the aqueous surface with surface-and chemically sensitive X-ray photoelectron spectroscopy (XPS), which reveals information about the surface structure on a molecular level. The experimental data is complemented with molecular dynamics (MD) simulations. A concentration-dependent orientation and solvation of the amphiphiles at the aqueous surface is observed. At bulk concentrations as low as around 100 mM, a monolayer starts to form for both isomers, with the hydroxyl groups pointing towards the bulk water and the alkyl chains pointing towards the vacuum. The monolayer (ML) packing density of 3-pentanol is approx. 70 % of the one observed for 1-pentanol, with a molar surface concentration that is approx. 90 times higher than the bulk concentration for both molecules. The molecular area at ML coverage (≈ 100 mM) was calculated to be around 32 ± 2 Å 2 /molecule for 1-pentanol and around 46 ± 2 Å 2 /molecule for 3-pentanol, which results in a higher surface concentration (molecules/cm 2 )for the linear isomer. In general we conclude therefore that isomers -with comparable surface activities -that have smaller molecular areas will be more abundant at the interface in comparison to isomers with larger molecular areas, which might be of crucial importance for the understanding of key properties of aerosols, such as evaporation and uptake capabilities as well as their reactivity.

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“…The time-dependence of the interfacial tension is related to the surface saturation kinetics. The surface saturation rate is governed mainly by two processes: (1) molecular diffusion to the interface and (2) the reorientation of molecules at the interface [19,20]. In addition, n-butanol makes the solvent more polar, increasing the water-solvent mutual solubility.…”

Section: Interfacial Behavior For Asphaltene + Alcohol Systemsmentioning

confidence: 99%

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Martins

Santos

2018

Colloids and Interfaces

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Abstract:Crude oil asphaltenes contain a wide series of chemical species, which includes the most polar compounds and interfacially active agents from the petroleum. Asphaltenes have been considered to be implicated in foam and emulsion formation during the petroleum recovery and production process. In this work, the interfacial activity of organic solutions containing asphaltene and n-alcohols was investigated. Asphaltene extraction from a 28 • API crude oil produced 2.5 wt % of n-pentane precipitated asphaltene (C5I). Dynamic surface and interfacial tensions of asphaltene solutions were assessed by the pendant drop method. Asphaltene films were evaluated at the air-water interface using a Langmuir trough. Results were expressed by means of the interfacial tension time-dependence. Interfacial tension measurements showed alcohols reduce the toluene/water interfacial tension of asphaltene solutions. The interfacial tension was reduced from 23 mN/m to 15.5 mN/m for a 2 g/L solution of asphaltene plus n-butanol. Higher asphaltene concentrations did not affect the toluene/air surface tension. The effects of n-alcohols on the asphaltene surface activity was dependent on the asphaltene aggregation state. n-Alcohols modify the asphaltene film elasticity and the film phase behavior.

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Surface tension and adsorption kinetics of amphiphiles in aqueous solutions: The role of carbon chain length and temperature

Cited by 22 publications

References 50 publications

New sensitive micro-measurements of dynamic surface tension and diffusion coefficients: Validated and tested for the adsorption of 1-Octanol at a microscopic air-water interface and its dissolution into water

New sensitive micro-measurements of dynamic surface tension and diffusion coefficients: Validated and tested for the adsorption of 1-Octanol at a microscopic air-water interface and its dissolution into water

Surface behavior of amphiphiles in aqueous solution: a comparison between different pentanol isomers

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

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