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Volumn 114, Issue 9, 2001, Pages 4107-4115

Structural study of supercritical water. III. Rotational dynamics

Author keywords

[No Author keywords available]

Indexed keywords

BOUNDARY CONDITIONS; COMPUTER SIMULATION; DENSITY OF LIQUIDS; HIGH TEMPERATURE EFFECTS; HYDROGEN BONDS; MOLECULAR DYNAMICS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; RELAXATION PROCESSES; SATURATION (MATERIALS COMPOSITION); SUPERCRITICAL FLUIDS;

EID: 0035280770     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1336571     Document Type: Article
Times cited : (81)

References (134)
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    • 0005638122 scopus 로고    scopus 로고
    • note
    • In this paper, the term "supercritical water" refers to fluid water at a temperature above the critical. Note that the pressure (or density) is not specified.
  • 2
    • 0005647203 scopus 로고
    • edited by D. W. Tedder and F. G. Pohland (American Chemical Society, Washington, DC)
    • J. W. Tester, H. R. Holgate, F. J. Armellini et al., in ACS Symposium Series 518, edited by D. W. Tedder and F. G. Pohland (American Chemical Society, Washington, DC, 1993).
    • (1993) ACS Symposium Series , vol.518
    • Tester, J.W.1    Holgate, H.R.2    Armellini, F.J.3
  • 7
    • 85029176736 scopus 로고    scopus 로고
    • N. Matubayasi, C. Wakai, and M. Nakahara, Phys. Rev. Lett. 78, 2573 (1997); 78, 4309 (1997).
    • (1997) Phys. Rev. Lett. , vol.78 , pp. 4309
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    • 0000530660 scopus 로고
    • J. Jonas, Science 216, 1179 (1982).
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    • Jonas, J.1
  • 27
    • 0001403768 scopus 로고    scopus 로고
    • and the references cited therein
    • N. Matubayasi and M. Nakahara, J. Chem. Phys. 112, 8089 (2000), and the references cited therein.
    • (2000) J. Chem. Phys. , vol.112 , pp. 8089
    • Matubayasi, N.1    Nakahara, M.2
  • 33
    • 0003416913 scopus 로고
    • The Japan Society of Mechanical Engineers, Tokyo
    • Thermophysical Properties of Fluids (The Japan Society of Mechanical Engineers, Tokyo, 1983).
    • (1983) Thermophysical Properties of Fluids
  • 34
    • 0005547099 scopus 로고    scopus 로고
    • note
    • The diameter of a capillary employed in this work may be too large to call our apparatus "capillary." We keep the term "capillary" for the conformity of terminology with Refs. 6 and 7.
  • 35
    • 0005545696 scopus 로고    scopus 로고
    • note
    • 1 on the surface and in the bulk does not affect our measurements. In Sec. III, it is shown that the reorientational correlation time determined from the experimental NMR relaxation time is in good agreement with the corresponding simulation result. This provides a further support for the absence of the surface effects.
  • 37
    • 0005553158 scopus 로고    scopus 로고
    • note
    • 1 in the present experimental conditions.
  • 40
    • 0005598959 scopus 로고    scopus 로고
    • note
    • The simulation temperature is not required to be identical to the expertmental temperature for the physics of our interest. When the phenomena essentially determined by the potential energy are concerned, it seems reasonable to adopt the simulation temperature involving the same reduced temperature as the experimental temperature. When the phenomena concerned are largely affected by the kinetic energy, on the other hand, the simulation temperature needs to be close to the experimental temperature. For the rotational dynamics in high-temperature water, both the potential and kinetic contributions will be relevant. In this work, since we extract only the qualitative or semiquantitative features from the simulations, a precise specification of the simulation temperature will not be necessary.
  • 47
    • 0005638125 scopus 로고    scopus 로고
    • note
    • 2O is ∼10% at ρ = +0.0.
  • 52
    • 0005636447 scopus 로고    scopus 로고
    • note
    • When the local electric field is not too strong, both the electronic and nuclear polarizations of a water molecule will be proportional to the local electric field. In this case, when the deviation of the QCC value at a given configuration from that at the dilute gas state is assumed to be proportional to the local electric field, the proportionality relationship can actually be expressed in terms of the QCC and the electronic (or nuclear) polarization. Thus, although our proportionality assumption is concerned only with the QCC and dipole moment, it will be valid in the presence of the nuclear polarization when both the electronic and nuclear polarizations are proportional to the local electric field.
  • 55
    • 0005553163 scopus 로고    scopus 로고
    • note
    • As pointed out in Ref. 53, the "free-rotor correlation time" is simply the characteristic time for the initial decay of the reorientational time correlation function. The actual correlation time of a free rotor is infinite due to the conservation of the angular momentum and has no relationship to the "free-rotor correlation time." It is thus misleading to consider that the reorientational dynamics of supercritical water treated in this work is "free-rotor-like" and is not affected by the intermolecular interactions.
  • 56
    • 0005646914 scopus 로고    scopus 로고
    • note
    • It is a matter of semantics to judge whether or not the hydrogen bonding affects the reorientational dynamics. According to Fig. 4, however, when the effect of the hydrogen bonding is to be called "strong" in the reorientational dynamics in ambient water, it should be called at least "present" in supercritical water.
  • 57
    • 0005641188 scopus 로고    scopus 로고
    • note
    • 2O overwhelms the effect of the difference in the hydrogen bond strength.
  • 68
    • 26944502237 scopus 로고    scopus 로고
    • note
    • In this paper, the term "supercritical water" refers to fluid water at a temperature above the critical. Note that the pressure (or density) is not specified.
  • 69
    • 26944457988 scopus 로고
    • edited by D. W. Tedder and F. G. Pohland (American Chemical Society, Washington, DC)
    • J. W. Tester, H. R. Holgate, F. J. Armellini et al., in ACS Symposium Series 518, edited by D. W. Tedder and F. G. Pohland (American Chemical Society, Washington, DC, 1993).
    • (1993) ACS Symposium Series 518
    • Tester, J.W.1    Holgate, H.R.2    Armellini, F.J.3
  • 93
    • 0000530660 scopus 로고
    • J. Jonas, Science 216, 1179 (1982).
    • (1982) Science , vol.216 , pp. 1179
    • Jonas, J.1
  • 100
    • 0003416913 scopus 로고
    • The Japan Society of Mechanical Engineers, Tokyo
    • Thermophysical Properties of Fluids (The Japan Society of Mechanical Engineers, Tokyo, 1983).
    • (1983) Thermophysical Properties of Fluids
  • 101
    • 26944459139 scopus 로고    scopus 로고
    • note
    • The diameter of a capillary employed in this work may be too large to call our apparatus "capillary." We keep the term "capillary" for the conformity of terminology with Refs. 6 and 7.
  • 102
    • 26944467839 scopus 로고    scopus 로고
    • note
    • 1 on the surface and in the bulk does not affect our measurements. In Sec. III, it is shown that the reorientational correlation time determined from the experimental NMR relaxation time is in good agreement with the corresponding simulation result. This provides a further support for the absence of the surface effects.
  • 104
    • 26944442996 scopus 로고    scopus 로고
    • note
    • 1 in the present experimental conditions.
  • 107
    • 26944490604 scopus 로고    scopus 로고
    • note
    • The simulation temperature is not required to be identical to the experimental temperature for the physics of our interest. When the phenomena essentially determined by the potential energy are concerned, it seems reasonable to adopt the simulation temperature involving the same reduced temperature as the experimental temperature. When the phenomena concerned are largely affected by the kinetic energy, on the other hand, the simulation temperature needs to be close to the experimental temperature. For the rotational dynamics in high-temperature water, both the potential and kinetic contributions will be relevant. In this work, since we extract only the qualitative or semiquantitative features from the simulations, a precise specification of the simulation temperature will not be necessary.
  • 114
    • 26944433326 scopus 로고    scopus 로고
    • note
    • 2O is ∼10% at ρ=+0.0.
  • 119
    • 26944446854 scopus 로고    scopus 로고
    • note
    • When the local electric field is not too strong, both the electronic and nuclear polarizations of a water molecule will be proportional to the local electric field. In this case, when the deviation of the QCC value at a given configuration from that at the dilute gas state is assumed to be proportional to the local electric field, the proportionality relationship can actually be expressed in terms of the QCC and the electronic (or nuclear) polarization. Thus, although our proportionality assumption is concerned only with the QCC and dipole moment, it will be valid in the presence of the nuclear polarization when both the electronic and nuclear polarizations are proportional to the local electric field.
  • 122
    • 26944485406 scopus 로고    scopus 로고
    • note
    • As pointed out in Ref. 53, the "free-rotor correlation time" is simply the characteristic time for the initial decay of the reorientational time correlation function. The actual correlation time of a free rotor is infinite due to the conservation of the angular momentum and has no relationship to the "free-rotor correlation time." It is thus misleading to consider that the reorientational dynamics of supercritical water treated in this work is "free-rotor-like" and is not affected by the intermolecular interactions.
  • 123
    • 26944484676 scopus 로고    scopus 로고
    • note
    • It is a matter of semantics to judge whether or not the hydrogen bonding affects the reorientational dynamics. According to Fig. 4, however, when the effect of the hydrogen bonding is to be called "strong" in the reorientational dynamics in ambient water, it should be called at least "present" in supercritical water.
  • 124
    • 26944452303 scopus 로고    scopus 로고
    • note
    • 2O overwhelms the effect of the difference in the hydrogen bond strength.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.