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Pseudocritical or hysteresis temperature versus pore size for simple fluids confined in cylindrical nanopores
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10.1063/1.2948967
/content/aip/journal/jcp/129/2/10.1063/1.2948967
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/2/10.1063/1.2948967

Figures

Image of FIG. 1.
FIG. 1.

Adsorption/desorption isotherms at , 0.90, and 1.20 in the isobaric-isothermal ensemble for Lennard-Jones fluid confined in the cylindrical pores (symbols) of reduced radii 2.5 (triangles), 4.0 (squares), and in the slit pore of reduced width 8 (circles). Lines and vertical branches are guides to the eye.

Image of FIG. 2.
FIG. 2.

Reduced confined fluid density after optimization as a function of along the liquidlike isotherm branches shown in Fig. 1. For comparison, the bulk fluid equations of state (fluid density vs pressure) are also given.

Image of FIG. 3.
FIG. 3.

Evolution of with the reduced inverse optimized pore size for various temperatures. Solid lines: best fit for Eqs. (6)–(8) (see text).

Image of FIG. 4.
FIG. 4.

Evolution of with the reduced temperature for various pore sizes. Solid lines: best fit for Eqs. (6)–(8) (see text).

Image of FIG. 5.
FIG. 5.

Confined fluid adsorption/desorption isotherms for three (optimized) pore sizes and deduced from Eqs. (5)–(8). The bulk equation of state (Ref. 46) is also given.

Image of FIG. 6.
FIG. 6.

Variations of the hysteresis temperature shift relative to the bulk critical temperature , as a function of the inverse reduced pore radius. MCM-41 data (Ref. 6): (●) Ar, (▲) . (1) Empirical relation of Morishige and Shikimi (Ref. 6). Predictions: (2) Evans et al. (Ref. 4); (3) Sonwane and Bhatia (Ref. 7); and (4) this work.

Tables

Generic image for table
Table I.

New pore sizes obtained after optimization [see Eq. (5) and text] along the nine liquidlike portions of the isotherms shown in Fig. 1. The pores are labeled according to their nominal pore size (divergence of the external potential).

Generic image for table
Table II.

Values of obtained after optimization [see Eq. (5) and text] along the nine liquidlike portions of the isotherms shown in Fig. 1. The pores are labeled according to their nominal pore size (divergence of the external potential).

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/content/aip/journal/jcp/129/2/10.1063/1.2948967
2008-07-08
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pseudocritical or hysteresis temperature versus pore size for simple fluids confined in cylindrical nanopores
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/2/10.1063/1.2948967
10.1063/1.2948967
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