A Precision Adsorption Apparatus for the Study of the interactions between Gas Atoms and Surfaces

Constabaris, G.; Singleton, J. H.; Halsey, G. D.

doi:10.1021/j150579a002

Cited by 23 publications

(5 citation statements)

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“…The vapor pressure p0 was calculated from data given by Din,20 which can be fitted by the equation In p0 (cm.) = 13.524 -803.88/T (7) In calculating the integral entropy, we have joined the Langmuir entropy onto the data at coverages below = 0.04 by choice of the constant in the Langmuir expression Sa = So + kln [9/(1 -9)] (8) This of course can be integrated from zero coverage. The integral entropy then is given by the equation Ss = (1/9) JQ6 Ssd9 (9)…”

Section: Methodsmentioning

confidence: 99%

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹

Sams¹,

Constabaris²,

Halsey³

1962

J. Phys. Chem.

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Section: Methodsmentioning

confidence: 99%

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹

Sams¹,

Constabaris²,

Halsey³

1962

J. Phys. Chem.

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“…He adsorption at low temperature (4 K) is proposed as a routine method for characterization of microporous materials − For more references on this subject, see ref , p 314. Our experiments with He adsorption on a sample of active carbon BPL have shown that He adsorption in micropores is appreciable and has to be taken into account while analyzing the excess adsorption isotherms obtained by using He calibration (see section VII).…”

Section: Origins Of the Inconsistency Of The Theoretical And Experime...mentioning

confidence: 99%

Calibration of Pore Volume in Adsorption Experiments and Theoretical Models

1997

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We propose a new definition of excess adsorption for use in molecular models of adsorption. This definition implies the calibration of theoretical models in a manner mimicking the experimental calibration procedure. The method of theoretical calibration is developed on the example of helium calibration. The notions of the He calibrated pore volume and the He calibrated pore size are introduced, and the He calibrated theoretical excess isotherms are defined. The proposed method diminishes the discrepancies between the theoretical and the experimental excess adsorption isotherms and makes the theory and the experiment entirely consistent. The quantitative estimates are made by means of the nonlocal density functional theory (NLDFT) applied to the adsorption of He, N2, and CH4 in micropores of active carbons at liquid nitrogen and ambient temperatures. It is shown that the experimental He calibration affects significantly the excess isotherms of vapors and supercritical fluids in microporous carbons. The nonmonotonous excess isotherms in molecular size pores are predicted. The theoretical predictions of He adsorption are in qualitative agreement with the experimental isotherm measured on the BPL active carbon at 77 K. The theoretical calibration is recommended for adjustment of any molecular model of adsorption phenomena, such as density functional theory, molecular dynamics, and grand canonical and other Monte Carlo simulations.

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“…76, No. 88, 1978 x r{ (rm -1 )/n] (2) where A is the surface area of the solid, z0 is the finite distance at which the interaction energy is zero (the "distance of closest approach"), m < n, and r{ (rml)/n} is a function. This function was calculated for the (3,9) and (4,10) gas-solid potentials and the results are shown in Figure 5.…”

Section: Discussionmentioning

confidence: 99%

“…The sample cell:(1) Monel metal gas inlet tube (Vie in. );(2) Pyrex wool plug; (3) stainless steel screw;(4)…”

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Modifications to a precision adsorption apparatus. Interaction of the inert gases with boron nitride

Ramsey¹,

Thomas²,

Pierotti³

1972

J. Phys. Chem.

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A modified high-precision volumetric adsorption apparatus is described. The apparatus incorporates a precision. cryostat, the precise pressure-measuring techniques of gas thermometry, and a null capacitance manometer. The use of the capacitance manometer to separate the mercury manometer from the adsorption system is shown to eliminate a number of apparatus corrections and to simplify the acquisition of data. The apparatus is suitable for the investigation of the low-coverage, high-temperature physical adsorption region in which Henry's law behavior and deviations therefrom occur.Measurements are reported for the adsorption of neon, argon, krypton, and xenon on the hexagonal modification of boron nitride at 273°K. The results are analyzed using the gas-solid virial coefficient treatment to give energies of interaction of these gases with boron nitride.

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A Precision Adsorption Apparatus for the Study of the interactions between Gas Atoms and Surfaces

Cited by 23 publications

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ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹

Calibration of Pore Volume in Adsorption Experiments and Theoretical Models

Modifications to a precision adsorption apparatus. Interaction of the inert gases with boron nitride

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A Precision Adsorption Apparatus for the Study of the interactions between Gas Atoms and Surfaces

Cited by 23 publications

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ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION1

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION1

Calibration of Pore Volume in Adsorption Experiments and Theoretical Models

Modifications to a precision adsorption apparatus. Interaction of the inert gases with boron nitride

Contact Info

Product

Resources

About

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹

ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION¹