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Volumn 104, Issue 30, 2000, Pages 6924-6939

Intermolecular interactions and local density augmentation in supercritical solvation: A survey of simulation and experimental results

Author keywords

[No Author keywords available]

Indexed keywords

ATOMS; DISSOLUTION; MOLECULAR DYNAMICS; QUANTUM THEORY; SOLVENTS;

EID: 0034248103     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp000888d     Document Type: Article
Times cited : (118)

References (79)
  • 4
    • 0343049832 scopus 로고    scopus 로고
    • note
    • References 2, 6, 13, and especially ref 5 provide recent reviews of much of the research on solvation and density augmentation in supercritical fluids.
  • 22
    • 0343485716 scopus 로고    scopus 로고
    • The solute and solvent dependence of local density augmentation in supercritical fluids
    • to be submitted for publication
    • Lewis, J.; Biswas, R.; Robinson, A.; Maroncelli, M. The Solute and Solvent Dependence of Local Density Augmentation in Supercritical Fluids. J. Phys. Chem. A, to be submitted for publication.
    • J. Phys. Chem. A
    • Lewis, J.1    Biswas, R.2    Robinson, A.3    Maroncelli, M.4
  • 25
    • 0342615653 scopus 로고    scopus 로고
    • note
    • 41
  • 26
    • 0002470521 scopus 로고
    • Local density augmentation in supercritical solutions: A comparison between fluorescence spectroscopy and molecular dynamics results
    • Recent Advances in Supercritical Fluid Technology: Applications and Fundamental Studies; Bright, F. V., McNally, M. E. P., Eds.; American Chemical Society: Washington, DC
    • Knutson, B. L.; Tomasko, D. L.; Eckert, C. A.; Debenedetti, P. G.; Chialvo, A. A. Local Density Augmentation in Supercritical Solutions: A Comparison Between Fluorescence Spectroscopy and Molecular Dynamics Results. In Recent Advances in Supercritical Fluid Technology: Applications and Fundamental Studies; Bright, F. V., McNally, M. E. P., Eds.; ACS Symposium Series; American Chemical Society: Washington, DC, 1992; Vol. 488; p 60.
    • (1992) ACS Symposium Series , vol.488 , pp. 60
    • Knutson, B.L.1    Tomasko, D.L.2    Eckert, C.A.3    Debenedetti, P.G.4    Chialvo, A.A.5
  • 46
    • 0343049798 scopus 로고    scopus 로고
    • note
    • A number of authors have discussed how best to define local densities. See, for example, the discussions in refs 5, 12, and 19.
  • 47
    • 0343485707 scopus 로고    scopus 로고
    • note
    • This excess density can be readily appreciated from the fact that radial distribution functions of net solvent density typically peak at values of 2-3 under liquidlike conditions.
  • 48
    • 0343921460 scopus 로고    scopus 로고
    • note
    • c = 0.5-0.6. The higher temperature of the supercritical reference state should make attractive interactions of lesser importance at these densities than in liquid solvents, and thus render the two reference states more similar than they would be otherwise.
  • 50
    • 0342615641 scopus 로고    scopus 로고
    • note
    • v = ρ for ρ = 2ρc.
  • 53
    • 0342615642 scopus 로고    scopus 로고
    • note
    • ij.
  • 54
    • 0343485708 scopus 로고    scopus 로고
    • note
    • 2dr
  • 55
    • 0343921461 scopus 로고    scopus 로고
    • note
    • 0(r) because the solvent molecules are more compact than the solutes. One could define distribution functions in terms of atom-atom distances to eliminate most of this source of broadening. We choose not to do so here because the distance s is the most direct indicator of whether a solvent molecule should be considered to be in the first solvation shell of the solute, and it is the energetics of such solvent-solute contacts that we wish to measure.
  • 56
    • 0343049794 scopus 로고    scopus 로고
    • note
    • The only difference is that in some simulations the intermolecular potential function is actually truncated at some cutoff radius, whereas in the 2-molecule calculations performed here, no truncation is applied.
  • 57
    • 0042680139 scopus 로고
    • Semichem Inc.: Shawnee, KS
    • AMPAC5.0. Semichem Inc.: Shawnee, KS, 1994.
    • (1994) AMPAC5.0
  • 67
    • 0343921459 scopus 로고    scopus 로고
    • note
    • 40 who performed thorough Monte Carlo simulations of the effects of density augmentation on vibrational relaxation. Their data were not included because the potential functions used were not of the Lennard - Jones type and because we could not translate the contact values of g(σ) measured in that work into local densities.
  • 68
    • 0031549627 scopus 로고    scopus 로고
    • and references therein
    • There has been a great deal of interest in computer simulations of ions in supercritical water. See, for example, Flanagin, L. W.; Balbuena, P. B.; Johnston, K. P.; Rossky, P. J. J. Phys. Chem. B 1997, 101, 7998, and references therein.
    • (1997) J. Phys. Chem. B , vol.101 , pp. 7998
    • Flanagin, L.W.1    Balbuena, P.B.2    Johnston, K.P.3    Rossky, P.J.4
  • 69
    • 0343049795 scopus 로고    scopus 로고
    • note
    • BT}. This value (2.86) differs from the value (2.3) given by the authors of ref 28, for unknown reasons.
  • 70
    • 0343049796 scopus 로고    scopus 로고
    • note
    • Different authors employ slightly different definitions of the first solvation shell, but our studies show that the results are not terribly sensitive to the choice, as long as only the nearest neighborhood of the solute is sampled.
  • 72
    • 0343485704 scopus 로고    scopus 로고
    • note
    • c) using radial distribution functions from Percus-Yevick integral equation calculations.
  • 74
    • 0343485705 scopus 로고    scopus 로고
    • note
    • max) does not vary greatly: a value of 2.5 ± 0.5(1σ) is found for a wide variety of systems.
  • 75
    • 0343921458 scopus 로고    scopus 로고
    • note
    • We take 14 (out of 16) simulations, the number of distinct solute/ solvent combinations, to be the size of the "independent" data set examined. Similarly, for the experimental data set we take the number of independent points to be 38 (out of the 52 data sets listed in Table 5).
  • 76
    • 0343049797 scopus 로고    scopus 로고
    • note
    • 2, ethane, fluoroform) are compared. No significant differences were found for such single-solvent correlations compared to what is observed with the complete set of experimental data.
  • 77
    • 0343049786 scopus 로고    scopus 로고
    • note
    • For completeness we examined multiple linear regressions between the augmentation measures and the various quantities listed in Table 6. These multiple regressions did not provide significant improvements over the best single-variable correlations already discussed.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.