<b>Physical Adsorption in the Multilayer Region on Heterogeneous and Homogeneous Surfaces</b>

Pierce, Conway; Ewing, Bland

doi:10.1021/ja00880a020

Cited by 25 publications

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“…This equation has the form: -In P/PO = k/ns, where k is a constant related to the energy of adsorption in the first layer, n = Va /Vm is the number of statistical layers, and the exponent s is related to the fall-off of the van der Waals forces of the surface with successive layers in the adsorbed film. Pierce (1959Pierce ( , 1960 and Pierce and Ewing (1962) have shown that the ideal N2 isotherm fits a modification of the multilayer equation, in the form 2 =75 (Va 2.75 \VmJ k…”

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confidence: 99%

Physical Surface Features and Chemical Density of Dry Bacterial Spores

1963

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Gas-displacement and gasadsorption techniques were used to determine the chemical density and physical surface properties of the spores of Bacillus subtilis 15U, B. cereus 720, and B. stearothermophilus 1518 held in the dry state. Neither the observed densities nor the specific surface areas measured could be correlated with the heat resistance of the spores studied. Analysis of data obtained from a study of the adsorption of nitrogen by spores held at-195 C led to the postulate that the surface of the dry spore is relatively smooth and impervious, and is characterized by the presence of a few pores having radii of approximately 300 A. The presence of such orifices could account for the permeability of the spore form reported by other workers.

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confidence: 99%

Physical Surface Features and Chemical Density of Dry Bacterial Spores

1963

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Nitrogen adsorption isotherms on polyolefins

Hightower

Emmett

1964

J. Polym. Sci. A Gen. Pap.

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Nitrogen adsorption isotherms were determined for a number of polyolefinic compounds. B.E.T. calculations showed that most of the samples possess surface areas averaging about 0.5 m.2/g., although a few very high molecular weight polyolefins precipitated during polymerization have areas of about 8 m.2/g. On most of the polyolefins, the C values from the B.E.T. equation are unusually small, indicating a relatively low heat of nitrogen adsorption. Adsorption isotherms were determined with krypton on two of the high polymers and were found to yield areas in satisfactory agreement with those obtained from the nitrogen adsorption experiments.

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The Physical adsorption of gases on solids

Steele

1967

Advances in Colloid and Interface Science

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Physical Adsorption in the Multilayer Region on Heterogeneous and Homogeneous Surfaces

Cited by 25 publications

References 0 publications

Physical Surface Features and Chemical Density of Dry Bacterial Spores

Physical Surface Features and Chemical Density of Dry Bacterial Spores

Nitrogen adsorption isotherms on polyolefins

The Physical adsorption of gases on solids

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