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Extended Langmuir Isotherm for Binary Liquid Mixtures
Langmuir, 2001A new model for describing the surface tension of binary liquid mixtures as a function of the bulk composition over the whole concentration range is presented. We first derive an equation relating surface and bulk volume fractions that generalizes the Langmuir isotherm so as to cover the entire range of concentrations. By combining this isotherm with a
Ángel Piñeiro +4 more
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Langmuir and BET theories (kinetic isotherms)
1991The success of kinetic theories directed toward the measurements of surface areas depends upon their ability to predict the number of adsorbate molecules required exactly to cover the solid with a single molecular layer. Equally important is the cross-sectional area of each molecule or the effective area covered by each adsorbed molecule on the surface.
S. Lowell, Joan E. Shields
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Langmuir Isotherms of Quenched and Annealed Polyelectrolyte Brushes
Langmuir, 2000We report here Langmuir isotherms of diblock copolymers containing a short neutral hydrophobic sequence (polystyrene) and a long water-soluble polyelectrolyte sequence (polyvinyl-2-pyridine). This study focuses on the polyelectrolyte sequence, which is a weak polyelectrolyte when unmodified and strong polyelectrolyte when quaternized.
C. Prinz, P. Muller, M. Maaloum
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Pressure Swing Adsorption for a System with a Langmuir Isotherm
Separation Science and Technology, 1988Abstract An analytical expression is obtained for the equilibrium relationship between the enrichment factor of the product stream and the ratio of the pressure in the feed stream to that in the product stream for a pressure-swing-adsorption system with a Langmuir isotherm. The enrichment factor is defined as the ratio of the mole fraction of adsorbate
Xiaochun Lu +3 more
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"Ghost-Isotherms". Problems with Cleaning Langmuir Troughs
Langmuir, 1995Fluff-free precision paper wipes are widely used for cleaning Langmuir troughs with organic solvents. The results presented in this article show that paper tissues often contain surface-active agents, which may lead to the measurement of incorrect surface pressure-area isotherms.
P. B. Schneider +2 more
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A Generalized Form of the Langmuir Isotherm for Gas Adsorption in Glassy Polymers
Industrial & Engineering Chemistry Research, 1996Glassy polymers contain sites where excess free volume makes adsorption of gases possible; they also contain sites where ordinary absorption governed by Henry's law can occur. In this paper, we analyze the possibility of a continuous distribution of site types, characterized by values of adsorption capacity, affinity constant, and sorption constant ...
ESPOSITO F. +3 more
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Freundlich and Langmuir Isotherms as Models for the Adsorption of Toxicants on Activated Charcoal
Journal of Pharmaceutical Sciences, 1987The Langmuir isotherm has been widely used to characterize the adsorption of solutes from aqueous solutions. Activated charcoal adsorption data obtained experimentally, using a wide range of adsorbate concentrations, fit the Langmuir isotherm poorly but evidence a good fit to the Freundlich isotherm. Statistical analysis reveals this to be also true of
P K, Gessner, M M, Hasan
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Quantitative analysis of compression isotherms of fullerene C60 Langmuir layers
Colloid Journal, 2008The structure of fullerence C60 Langmuir layers formed from a solution in cyclohexane has been determined from their compression isotherms. The layer structure, in particular, the size of formed aggregates, has been shown to depend on the initial surface concentration of fullerene. A quantitative model of the Langmuir layer has been proposed.
L. A. VALKOVA +2 more
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The Napa Soil; Langmuir Isotherm Adsorption Equation
2020Napa soil is natural material that is used by West Sumatra people as medicine of stomachache and diarrhea. Napa soil highly contains SiO2 and Al2O3, the presentation is SiO2 63.20 % and Al2O3 16.55%. Thus, napa soil can be used as alternative material as source of silica and it is hoped that it can be used as potential inorganic m aterial as adsorbent,
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Adsorption at Liquid Interfaces: The Generalized Langmuir Isotherm and Interfacial Structure
The Journal of Physical Chemistry B, 2006The thermodynamics of adsorption of amphiphilic surface-active compounds at the interface between two immiscible liquids is considered. At the interface, these molecules are supposed to replace a few of the adsorbed molecules of both solvents. Classical isotherms of adsorption (Frumkin, Langmuir, Henry) were based on the model of nonpenetrable ...
Vladislav S, Markin +2 more
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