Dynamic Determination of Vapor/Water Interface Adsorption for Volatile Hydrophobic Organic Compounds (VHOCs) Using Axisymmetric Drop Shape Analysis:  Procedure and Analysis of Benzene Adsorption

Bruant, Jr. and Robert G.; Conklin, M. H.

doi:10.1021/jp001140y

Cited by 17 publications

(21 citation statements)

References 22 publications

(51 reference statements)

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“…Others [8][9][10] expanded the work to include low-molecular-weight, aliphatic hydrocarbons (C 5 -C 16 alkanes). More recently, surface pressures of an aromatic molecule (benzene) were obtained using an axi-symmetric pendant drop shape analysis procedure [11]. Donaldson and coworkers [12,13] used capillary rise method to obtain the adsorption isotherms for several atmospherically relevant gases (NH 3 , methylamines, C 1 -C 4 alcohols, and acids) at the air-water interface.…”

Section: Conventional Surface Pressure Measurementsmentioning

confidence: 99%

“…The compound is detected at the outlet of the reactor using a GC/MS. The total equilibrium uptake ratio is given by the following [18,23]: (11) where δ is the water film thickness (m). The measured value of the overall partition constant (K wa * ) is plotted against the inverse of the film thickness (1/δ) to obtain the slope K σa .…”

Section: Indirect Surface Concentration Measurementsmentioning

confidence: 99%

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Trace gas adsorption thermodynamics at the air−water interface: Implications in atmospheric chemistry

Valsaraj

2009

Pure and Applied Chemistry

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The thermodynamics of adsorption of gaseous organic compounds such as polycyclic aromatic hydrocarbons (PAHs) on water films is reviewed and discussed. The various experimental methods available to determine the thermodynamic equilibrium constant and the structure-activity relationships to correlate and estimate the same are reviewed. The atmos pheric implications of the adsorption and oxidation of PAHs at the air-water interface of thin films of water such as existing in fog droplets, ice films, and aerosols are also enumerated.

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Section: Conventional Surface Pressure Measurementsmentioning

confidence: 99%

Section: Indirect Surface Concentration Measurementsmentioning

confidence: 99%

Trace gas adsorption thermodynamics at the air−water interface: Implications in atmospheric chemistry

Valsaraj

2009

Pure and Applied Chemistry

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“…1 The experimental adsorption isotherms significantly differ from the idealized Langmuir isotherm. Thus, Bruant and Conklin have measured considerable adsorption of benzene 3 and its methylated derivatives 4 as well as their mixtures 5 on the water-vapor interface. Frumkin has proposed an empirical modification of the Langmuir isotherm by including a pairwise interaction within the adsorbed surfactant layer.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of apolar molecules at the water liquid–vapor interface: A Monte Carlo simulations study of the water-n-octane system

Jedlovszky

Varga

Gilányi

2003

The Journal of Chemical Physics

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The adsorption of n-octane at the water liquid-vapor interface has been investigated by Monte Carlo computer simulation. For this purpose, simulation of five different water-apolar interfacial systems have been performed, in which the number of n-octane molecules has been varied. The results clearly show that the apolar n-octane molecules are adsorbed from the vapor phase at the interface. The adsorption is driven by the weak attraction due to the dispersion forces acting between the water molecules and the methyl and methylene groups of the octanes. This weak attraction is, however, amplified by the fact that it is added up for the CH 2 and CH 3 groups belonging to the same molecule. Consistently, the n-octane molecules located closest to the aqueous phase are found to prefer all-trans conformation and parallel alignment with the plane of the interface. On the other hand, entropic effects become more important among the molecules of the outer part of the adsorption layer. Hence, the preferred orientation of these molecules is perpendicular to the interface, as they can be extended toward the less dense region of the apolar phase; and gauche dihedrals appear more frequently here than among the molecules located next to the aqueous phase.

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“…Surface tension-static Wilhelmy plate method [18] Surface tension-dynamic Axisymmetric drop shape analysis method [19] Gas chromatography Inverse gas chromatography method [20,21] Flow reactor Adsorption on a thin water film [22]…”

Section: Methods Description Referencementioning

confidence: 99%

A Review of the Aqueous Aerosol Surface Chemistry in the Atmospheric Context

Valsaraj¹

2012

OJPC

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In this review the surface chemistry and properties of aqueous atmospheric aerosols are explored. Water plays a major role in scavenging pollutants. Reactions occur on thin water films in atmospheric aerosols. The study of the aerosol wa- ter surface is important to properly account for chemical transformations in the troposphere. The thermodynamics of adsorption of organic molecules and oxidant species on the aqueous surface and, the techniques employed to quantify the adsorption isotherms are summarized. Experimental techniques for elucidating the reactions on the water surface are described. Field and laboratory data for oxidation reactions of compounds at the air-water interface are summarized. The Langmuir-Hinshelwood reaction mechanism is useful in quantifying the reaction rate on the aqueous aerosol sur- face. A hypothesis for the large heterogeneous reaction rate on the water surface over the homogeneous bulk aqueous phase reaction is presented

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Dynamic Determination of Vapor/Water Interface Adsorption for Volatile Hydrophobic Organic Compounds (VHOCs) Using Axisymmetric Drop Shape Analysis: Procedure and Analysis of Benzene Adsorption

Cited by 17 publications

References 22 publications

Trace gas adsorption thermodynamics at the air−water interface: Implications in atmospheric chemistry

Trace gas adsorption thermodynamics at the air−water interface: Implications in atmospheric chemistry

Adsorption of apolar molecules at the water liquid–vapor interface: A Monte Carlo simulations study of the water-n-octane system

A Review of the Aqueous Aerosol Surface Chemistry in the Atmospheric Context

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