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- W2100092006 abstract "Using the Picker flow microcalorimeter, excess heat capacities have been measured through the composition range at 20, 40 and 55 °C for the following mixtures of normal alkanes: C6+ C16, C8+ C14, C8+ C16 and C9+ C16. The following mixtures were studied at two of the above temperatures: C6+ C8, + C9, + C12 and + C14, C8+ C12, C9+ C12 and C12+ C16. The CEp values are negative, usually decreasing in magnitude with increasing T. Unlike regular solution theory, CEp per unit volume is not symmetrical in volume fraction, the curves being skewed toward the higher alkane side of the composition range. On raising T, CEp per unit volume tends to symmetry in volume fraction. The magnitudes and temperature and composition dependences of CEp are not consistent with current theory, but are predicted by a corresponding states approach which implies the existence of short-range orientational order in the higher alkane liquids. At all three temperatures, CEp values for the mixtures are mutually consistent within the framework of the Bronsted Principle of Congruence. This implies that orientational order between n-alkane chains does not depend directly on chain length, but on the density of packing of segments. However, CEp values at 20 °C do not coincide with values calculated from data of the pure n-alkanes using the Principle of Congruence. This failure is related to an anomalous value for the internal Cp of pure n-C16 at 20 °C close to the freezing point." @default.
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- W2100092006 date "1982-01-01" @default.
- W2100092006 modified "2023-09-26" @default.
- W2100092006 title "Excess heat capacities of n-alkane mixtures" @default.
- W2100092006 doi "https://doi.org/10.1039/f29827800491" @default.
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