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Volumn 119, Issue 17, 2003, Pages 9145-9162

Modeling alkane+perfluoroalkane interactions using all-atom potentials: Failure of the usual combining rules

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC PHYSICS; COMPUTER SIMULATION; MOLECULES; REDUCTION;

EID: 0344467181     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1610435     Document Type: Article
Times cited : (130)

References (122)
  • 14
    • 0002347923 scopus 로고
    • edited by J. H. Simons (Academic, New York
    • T. M. Reed III, in Fluorine Chemistry, edited by J. H. Simons (Academic, New York, 1964), Vol. 5, pp. 133-236.
    • (1964) Fluorine Chemistry , vol.5 , pp. 133-236
    • Reed III, T.M.1
  • 41
    • 0344458699 scopus 로고    scopus 로고
    • note
    • Reference 37 does report on the behavior of a mixed perfluoro-n-decane+n-decane cluster (184 molecules), but the presence of the cluster surface does not allow for any comparison to the thermo-dynamic data available for bulk mixtures.
  • 44
    • 0344027596 scopus 로고    scopus 로고
    • note
    • Very recently, Borodin et al. (Ref. 28) have shown that the conformational properties of perfluoroalkane chains are not as well reproduced by the OPLS-AA potential as by their own model. However, the OPLS-AA potentials are more accurate in reproducing thermodynamic properties, which are of most interest here.
  • 53
    • 0345321652 scopus 로고    scopus 로고
    • CCLRC Daresbury Laboratory, Daresbury, UK, 2001
    • DL_POLY_2, edited by W. Smith and T. R. Forester (CCLRC Daresbury Laboratory, Daresbury, UK, 2001).
    • Smith, W.1    Forester, T.R.2
  • 56
    • 0345321653 scopus 로고    scopus 로고
    • note
    • B=92 K and σ=3.60 Å.
  • 58
    • 0344458697 scopus 로고    scopus 로고
    • note
    • 2 = 0.9996) and in all cases considered within about 0.1RT of one another.
  • 59
    • 0345321654 scopus 로고    scopus 로고
    • note
    • 2 and the odd-electron molecule NO which do not follow the same corresponding state behavior as the other gases.
  • 64
    • 0344458696 scopus 로고    scopus 로고
    • note
    • cav shown in Fig. 8.
  • 65
    • 0344890498 scopus 로고    scopus 로고
    • note
    • The approximation involved here is accurate to better than 10% for all but the smallest solutes. If the σ factor is taken into account, the qualitative features of Fig. 8 remain unchanged, but the slopes change by a few percent. These differences are unimportant for the present purposes.
  • 92
    • 0345321648 scopus 로고    scopus 로고
    • note
    • As pointed out by Waldman and Hagler (Ref. 85), the comparison is sensitive to the experimental data used. Our own tests using the data tabulated by Scholes (Ref. 121) show the Kong rules to perform slightly better, whereas the comparisons made by Waldman and Hagler (Ref. 85) show their rule to be preferable.
  • 93
    • 0344458667 scopus 로고    scopus 로고
    • note
    • BK in the AMBER force field (Ref. 68).
  • 97
    • 0345321624 scopus 로고    scopus 로고
    • note
    • 1/2.
  • 98
    • 0344890478 scopus 로고    scopus 로고
    • note
    • Apart from possible errors in reporting potential parameters, there are other sources of concern with the results of this study. First, the short simulation (15 ps) and unspecified equilibration lengths, suggest that the liquid mixtures may have been poorly equilibrated. The fact that the same (pairwise additive) potentials apparently reproduce both liquid and gas-phase properties is also curious, given the ∼ 10% energy scaling we find is needed in nonpolar systems. (See Sec. III A and Ref. 46.)
  • 103
    • 0344458666 scopus 로고    scopus 로고
    • unpublished
    • S. Tszuki (unpublished).
    • Tszuki, S.1
  • 104
    • 0344458665 scopus 로고    scopus 로고
    • note
    • We have taken these ab initio potentials and fit them to both Lennard-Jones and exp-6 atom-atom representations and then computed virial coefficients from them. The potentials are not sufficiently accurate to reproduce the virial data to within experimental uncertainties. Further-more, it is notable that these potentials follow the "virial geometric mean rule" [Eq. (7)] so do not show any sign of the special character of perfluoroalkane+ alkane interactions.
  • 122
    • 0344027577 scopus 로고    scopus 로고
    • note
    • See EPAPS Document No. E-JCPSA6-119-515339 for supplementary tables S1-S3 which list virial data and the potential parameters of the solutes used in solubility calculations. A direct link to this document may be found in the online article's HTML reference section. The document may also be reached via the EPAPS homepage (http://www.aip.org/pubservs/epaps.html) or from ftp.aip.org in the directory /epaps/. See the EPAPS homepage for more information.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.