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摘要: 利用Raman散射光谱在碳硅石压腔下研究了常温下的正戊烷从0.07~4.77 GPa的稳定性。结果表明:正戊烷的 CH3、CH2对称和反对称伸缩振动2 877 cm-1、2 964 cm-1和2 856 cm-1、2 935 cm-1以及-(CH2)n -同步扭曲振动1 303 cm-1均随压力增大而基本呈线性向高频方向移动,并在2.47 GPa附近发生过压凝固,这是一种平衡稳定态之外的亚稳态现象。另外推测正戊烷在高压下可能发生固-固相变,最后通过平衡的固液共存相确定了正戊烷的平衡凝固压力为(1.900.05) GPa。Abstract: Raman scattering spectroscopy was used to investigate stability of n-pentane in Moissanite anvil cell from 0.07 GPa up to 4.77 GPa at ambient temperature. The result shows that CH3 symmetric and asymmetric stretching vibration, CH2 symmetric and asymmetric stretching vibration and -(CH2)n - in-phase twist mode at 2 877 cm-1, 2 964 cm-1, 2 856 cm-1, 2 935 cm-1 and 1 303 cm-1, respectively, shifted to higher frequency according to quasi-linearity with pressure increase, and an abrupt visible change was taken place, indicating that it is a sort of phenomenon of freezing at overpressurization. In addition, a high-pressure transition phase may appear in crystallized n-pentane in the range of 2.84~4.77 GPa. The equilibrium freezing pressure of n-pentane is (1.900.05) GPa at 27 ℃ by measuring with the method of crystal-liquid coexistence.
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Hunt J M. Petroleum Geochemistry and Geology [M]. San Francisco: W H Freeman. 1979. 31-35. White C M, Jensen K L, Rohar P C, et al. Separation of Fischer-Tropsch Catalyst/Wax Mixtures Using Dense-Gas and Liquid Extraction [J]. Energy Fuels, 1996, 10(5): 1067. Jones D C. Characterisation of Liquid Brillouin Media at 532 nm [J]. Journal of Nonlinear Optical Physics Materials, 1997, 6(1): 69. Rhlid R B, Matthey D W, Blank I, et al. Lipase-Assisted Generation of 2-Methyl-3-Furanthiol and 2-Furfurylthiol from Thioacetates [J]. Journal of Agricultural and Food Chemistry, 2002, 50(14): 4087. Ganiev I M, Timerghazin Q K, Khalizov A F, et al. Complexes of Chlorine Dioxide with Nitroxyl Radicals [J]. Tetrahedron Letters, 1999, 40(25): 4737. Tkachev S N, Timerghazin Q K, Khalizov A F. Brillouin Scattering Study of Pentane at High Pressure [J]. Journal of Chemical Physics, 1996, 104(24): 10059. Gelles S H. Solidification of n-Pentane at High Hydrostatic Pressure [J]. J Chem Phys, 1968, 48: 526. Zeto R J, Vanfleet H B. Pressure Calibration to 60 kbar Based on the Resistance Change of a Manganin Coil under Hydrostatic Pressure [J]. J Appl Phys, 1969, 40: 2227. Bridgman P W. Proceedings of the American Academy of Arts and Sciences [C]. 1949. 77: 117. Bridgman P W. The Physics of High Pressure [M]. London: G Bell and Sons, Ltd, 1952. 399. Reeves L E, Babb S E. Melting Curves of Pressure-Transmitting Fluids [J]. J Chem Phys, 1964, 40: 3662. Oliver W F, Herbst C A, Wolf G H. Viscous Liquids and Glasses under High Pressure [J]. J Non-Crystalline Solids, 1991, 84: 131-133. Houck J C. High Pressure Measurements of Density, Velocity of Sound, and Bulk Moduli of Pentane and 2-Methylbutane and Their Mixures [J]. Journal of Research of the National Bureau of Standards(A): Physics and Chemistry, 1974, 78: 617. Mao H K, Bell P M. Design and Varieties of the Megabar Cell [R]. Carnegie Institute Washington Yearbook, 1978. 77: 904. Schmidt C, Ziemann M. In-Situ Raman Spectroscopy of Quartz: A Pressure Sensor for Hydrothermal Diamond-Anvil Cell Experiments at Elevated Temperatures [J]. American Mineralogist, 2000, 85: 1725. Liu L, Mernaph T P. High-Pressure Raman Study of the -Quartz Forms of SiO2 and GeO2 at Room Temperature [J]. High Temperatures-High Pressures, 1992, 24: 13. Grasselli J G, Snavely M K, Bulkin B J. Chemical Applications of Raman Spectroscopy [M]. New York: A Wiley-Interscience Publication, 1981. 148. Coats J P. Hodges D R. Recent Analytical Developments in the Petroleum Industry [M]. Essex, England: Applied Science Publishers, 1974. 28. Lin V D, Colthup N B, Fateley W G, et al. The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules [Z]. Boston: Academic Press, 1991. 10-14. Colthup N B, Daly L H, Wiberley S E. Introduction to Infrared and Raman Spectroscopy [M]. Boston: Academic Press, 1990. 216-232. Lambert J B, Shurvell H F, Lightner D A, et al. Organic Structural Spectroscopy [M]. New Jersey: Prentice Hall, 1998. 196. Lambert J B, Shurvell H F, Lightner D A, et al. Introduction to Organic Spectroscopy [M]. New York: Macmillan, 1987. 178. Bridgman P W. The Viscosity of Liquids under Pressure [A]. Proceedings of the National Academy of Sciences of the United States of America [C]. 1925. 11: 603. Bridgman P W. The Physics of High Pressure [M]. London: G Bell and Sons Ltd, 1952. 341. Brugmans M J P, Vos W L. Competion between Vitrification and Crystallization of Methanol at High Pressure [J]. J Chem Phys, 1995, 103: 2661-2669.
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