Cluster Formation and Phase Transitions in the Adsorbed State

Cassel, Hans M.

doi:10.1021/j150436a007

Cited by 38 publications

(13 citation statements)

References 6 publications

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“…This equation and the twodimensional van der Waals constants a2 and 6 2 have been discussed by de Boer and Kruyer (1958), Cassel (1944), Hill (1952), and Ross and Olivier (1964). This equation and the twodimensional van der Waals constants a2 and 6 2 have been discussed by de Boer and Kruyer (1958), Cassel (1944), Hill (1952), and Ross and Olivier (1964).…”

Section: Equation 13 Then Becomes -mentioning

confidence: 81%

Improved Two-Dimensional Equation of State to Predict Adsorption of Pure and Mixed Hydrocarbons

Payne¹,

Sturdevant²,

Leland³

1968

Ind. Eng. Chem. Fund.

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SUBSCRIPTSA A , AB, BB d n C (0) W Y = system characteristic for in---.\ + CY (1x j terphase polycondensation, dimensionless. = terminal groups = continuous phase = dispersed phase = chain length = initial condition = molecular weight literature Cited A two-dimensional equation of state has been derived from the Hirschfelder-Eyring modification of the van der Waals equation and applied to the prediction of high pressure adsorption of pure and mixed hydrocarbons on charcoal. Equations are derived to express the thermodynamic equilibrium between a mixed adsorbate and gas, assuming the validity of the mobile fluid model for the surface phase. Solution of these equations permits the total adsorption and surface composition to be calculated for a mixed isotherm from pure component adsorption data. New experimental data are presented for high pressure adsorption of methane, propane, butane, and their mixtures on charcoal.

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Section: Equation 13 Then Becomes -mentioning

confidence: 81%

Improved Two-Dimensional Equation of State to Predict Adsorption of Pure and Mixed Hydrocarbons

Payne¹,

Sturdevant²,

Leland³

1968

Ind. Eng. Chem. Fund.

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“…At low loadings, the uptake increases slightly with pressure, resulted from the nucleation of a complex between water and functional group, followed by the formation of water clusters which further grow within the interstices between the micro-crystallites, a process of which is distinctly different from the molecular layering of wetting fluids [26]. The effect of clustering can be quantified by considering the adsorptive capacity at a 0.9 relative pressure of 20µmol/g or 4µmol/m 2 , which is 5 times less than the amount that would hypothetically cover the graphite surface with a monolayer of water molecules [27].…”

Section: Water Adsorption On Carbopack F and Hexmentioning

confidence: 99%

Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Horikawa

Muguruma

et al. 2015

Carbon

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Adsorption isotherms of water on porous carbons generally show large hysteresis loops whose origin is believed to be different from simple gases adsorption in mesoporous solids. In this paper, we discussed in details the behavior of water adsorption isotherms and their descending scanning curves for two carbons of different topologies, a highly graphitized thermal carbon black, Carbopack F, and a highly ordered mesoporous carbon, Hex. For both solids, very large hysteresis loops are observed, but their behaviors are different. For Carbopack F, the loop extends over a very wide range of pressure and the loop is larger when the descending is started from a higher loading; while for Hex, the hysteresis loop shows distinct steps, the number of which depends on the loading where the descending starts. By carefully analyzing the scanning curves from different loadings, we established the mechanism of water adsorption in Hex as a sequence of three steps: (1) water molecules adsorb on functional groups located at the junctions between adjacent basal planes of graphene layers, (2) growth of water clusters around the functional groups, and (3) bridging of adjacent clusters to form larger clusters, followed by a complete filling of mesopores.

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“…From here, the clustering mechanism takes place. This clustering mechanism in the case of graphitised carbon has been reported by Cassel 76 , where adsorbents exhibit strong water uptake in the form of type III isotherm. In terms of isosteric heat profile, the initial heat of adsorption for associating fluids on graphite is relatively high due to the interaction between the fluid and functional group.…”

Section: Adsorption Of Polar Gases On Gtcbsupporting

confidence: 70%

“…Associating fluids initially adsorb preferentially around the functional groups to form clusters which grow in size due to the strong electrostatic interactions between partial charges 14,17,75 . This results in the formation of a physically bound complex, which then acts as a nucleating site for further adsorbate molecules to adsorb and grow into a cluster 76 . This is then followed with spreading and molecular layering mechanism as adsorption increases.…”

Section: Adsorption Of Polar Gases On Gtcbmentioning

confidence: 99%

Fundamental study of adsorption of non-polar and polar fluids on hydrophobic ordered solids

Prasetyo¹

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Adsorption of gases on solids has been a subject of interest due to its increasing use as an economical process for separation and purification in chemical and biochemical industries. To optimise these processes, a good fundamental understanding of adsorption is required. With the advancement of technology, a better understanding of the microscopic mechanism of various adsorption phenomena can be achieved with molecular simulation. This thesis

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Cluster Formation and Phase Transitions in the Adsorbed State

Cited by 38 publications

References 6 publications

Improved Two-Dimensional Equation of State to Predict Adsorption of Pure and Mixed Hydrocarbons

Improved Two-Dimensional Equation of State to Predict Adsorption of Pure and Mixed Hydrocarbons

Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Fundamental study of adsorption of non-polar and polar fluids on hydrophobic ordered solids

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