Freezing of simple fluids in microporous activated carbon fibers: Comparison of simulation and experiment
- 1 November 1999
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 111 (19), 9058-9067
- https://doi.org/10.1063/1.480261
Abstract
We study the freezing of in microporous activated carbon fibers (ACF), using Monte Carlo simulation and differential scanning calorimetry (DSC). Microporous activated carbon fibers are well characterized porous materials, having slit-shaped pores due to the voids formed between graphitic basal planes. They serve as highly attractive adsorbents for simple nonpolar molecules, the adsorbent–adsorbate interaction being mostly dispersive (of the van der Waals-type). Recent molecular simulation studies have predicted an upward shift in the freezing temperature for simple fluids confined in such highly attractive carbon slit pores. Our DSC experiments verify these predictions about the increase in The results also indicate significant deviation from the prediction of based on the Gibbs–Thomson equation (simple capillary theory). We employ a recently developed free energy method to calculate the exact freezing temperature in these confined systems using molecular simulation, in order to address the failure of the simple capillary theory.
Keywords
This publication has 46 references indexed in Scilit:
- Phase Transitions in Pores: Experimental and Simulation Studies of Melting and FreezingLangmuir, 1999
- Monte Carlo studies of the freezing and condensation transitions of confined fluidsMolecular Physics, 1999
- Organic nanocrystals: an NMR study of cyclohexane in porous silicaMolecular Physics, 1998
- Organic nanocrystals: an NMR study of cyclohexane in porous silicaMolecular Physics, 1998
- Phase transitions of CO2confined in nanometer pores as revealed by positronium annihilationJournal of Physics: Condensed Matter, 1995
- Dislocation Unbinding in Dense Two-Dimensional CrystalsPhysical Review Letters, 1995
- Triple-point wetting and surface melting of oxygen films adsorbed on graphitePhysical Review Letters, 1987
- Melting and the vector Coulomb gas in two dimensionsPhysical Review B, 1979
- Monte Carlo free energy estimates using non-Boltzmann sampling: Application to the sub-critical Lennard-Jones fluidChemical Physics Letters, 1974
- Absence of Ferromagnetism or Antiferromagnetism in One- or Two-Dimensional Isotropic Heisenberg ModelsPhysical Review Letters, 1966