On Physical Adsorption. VI. Two-dimensional Critical Phenomena of Xenon, Methane and Ethane Adsorbed Separately on Sodium Chloride<sup>1</sup>

Ross, Sydney; Clark, Hadden

doi:10.1021/ja01646a012

Cited by 40 publications

(3 citation statements)

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“…Figure 1 shows a family of isotherms comparing data predicted by this equation with experimental data. Ross has found similar behavior for many gases on alkali halide surfaces (38)(39)(40)(41). Other workers have found similar results (18, 31).…”

Section: Mobility Of Molecules At Low Concentrationssupporting

confidence: 58%

Surface Diffusion of Adsorbed Molecules

Dacey¹

1965

Ind. Eng. Chem.

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Section: Mobility Of Molecules At Low Concentrationssupporting

confidence: 58%

Surface Diffusion of Adsorbed Molecules

Dacey¹

1965

Ind. Eng. Chem.

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“…Water Adsorption Isotherm on Sn02. In the present work two series of treatments of the sample were performed: in series 1 the sample was pumped out at 1073 K under vacuum (1.5 X 10"3 N nr2) for 12 h, followed by treatment in 02 at 1.3 kN m"2 at 1073 K for 3 h. In series 2 the sample was first heated under vacuum (1.5 X 10"3 N nr2) at 1073 K for 4 h, next treated in H2 at 0.89 kN m'2 at 473 K for 2 h, and then placed in 02 at 2.0 kN nr2 at 1073 K for 3 h.…”

Section: Resultsmentioning

confidence: 99%

Adsorption anomaly in the system tin(IV) oxide-water

Morimoto¹,

Yokota²,

Kittaka³

1978

J. Phys. Chem.

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The adsorption anomaly of water on Sn02, i.e., the appearance of a discontinuity in the adsorption isotherm, was investigated by measuring the adsorption isotherm and the isosteric heat of adsorption on samples which had been treated in vacuo at 1073 K, in H2 at 473 K, and in 02 at 1073 K. The discontinuity disappeared when the samples were treated either in vacuo at 1073 K for a longer time or in H2 at 473 K, and reappeared after treatment of the sample at 1073 K in 02. A corresponding change in the isosteric heat of adsorption, qBt, was found; a plateau in the qBt curve, which was observed on the sample treated at 1073 K for 4 h, disappeared after H2 treatment and a monotonically decreasing curve was obtained, while the succeeding 02 treatment of the sample reproduced the plateau. This led to the conclusion that the removal of surface oxygens was responsible for the decay of the discontinuity. Crystallographic considerations on the Sn02 surfaces strongly suggest that the discontinuity mentioned above occurs on the well-developed (100) plane of Sn02.

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“…The first layer transition takes place at about 127 ± 1 K while the second is slightly higher at 127.5 ± 1 K. This temperature is 5−6 K lower than the 133 ± 1 K estimated by TC. These authors noted that their value is close to that of similar transitions of ethane on graphite (130 K) 10 and NaCl (132 K) and suggested that it is independent of the substrate despite significant differences in terms of symmetry and crystal field. Our results suggest that there is a small substrate effect.…”

Section: Resultsmentioning

confidence: 58%

Thermodynamic Investigation of Thin Films of Ethane Adsorbed on Magnesium Oxide

2005

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The layering properties of ethane on MgO(100) were measured between 91 and 144 K using high-resolution adsorption isotherms. In contrast to previous studies, the results demonstrate that only three layers are formed. The thermodynamic functions derived from the data (isosteric heat, differential enthalpy, and entropy of adsorption) compare well with literature values and show a steady trend toward the bulk properties as the number of layers increased. Phase transitions for two of the layers were identified by monitoring the changes in the two-dimensional isothermal compressibility as a function of chemical potential. Both of these phase transitions occur at approximately 127 K and within 1 K of each other. Through the use of neutron diffraction, it is possible to identify at least one solid surface phase that melts at approximately 75 K. The transition at 127 K is therefore a transition between a liquidlike phase and a hyper-critical fluid. A comparison is made between the present data and our recent study of methane on MgO.

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On Physical Adsorption. VI. Two-dimensional Critical Phenomena of Xenon, Methane and Ethane Adsorbed Separately on Sodium Chloride¹

Cited by 40 publications

References 0 publications

Surface Diffusion of Adsorbed Molecules

Surface Diffusion of Adsorbed Molecules

Adsorption anomaly in the system tin(IV) oxide-water

Thermodynamic Investigation of Thin Films of Ethane Adsorbed on Magnesium Oxide

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On Physical Adsorption. VI. Two-dimensional Critical Phenomena of Xenon, Methane and Ethane Adsorbed Separately on Sodium Chloride1

Cited by 40 publications

References 0 publications

Surface Diffusion of Adsorbed Molecules

Surface Diffusion of Adsorbed Molecules

Adsorption anomaly in the system tin(IV) oxide-water

Thermodynamic Investigation of Thin Films of Ethane Adsorbed on Magnesium Oxide

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Product

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On Physical Adsorption. VI. Two-dimensional Critical Phenomena of Xenon, Methane and Ethane Adsorbed Separately on Sodium Chloride¹