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- W2518996941 abstract "New measurements are reported for the isochoric heat capacity of the ionic liquid substance 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C6mim][NTf2]). These measurements extend the ranges of our earlier study (Polikhronidi et al. in Phys Chem Liq 52:657, 2014) by 5 % of the compressed liquid density and by 75 K. An adiabatic calorimeter was used to measure one-phase $$(C_{mathrm{V1}})$$ liquid and two-phase $$(C_{mathrm{V2}})$$ liquid + vapor isochoric heat capacities, densities $$(rho _s)$$ , and phase-transition temperatures $$(T_s)$$ of the ionic liquid (IL) substance. The combined expanded uncertainty of the density $$rho $$ and isochoric heat capacity $$C_mathrm{V}$$ measurements at the 95 % confidence level with a coverage factor of $$k = 2$$ is estimated to be 0.15 % and 3 %, respectively. Measurements are concentrated in the immediate vicinity of the liquid + vapor phase-transition curve, in order to closely observe phase transitions. The present measurements and those of our earlier study are analyzed together and are presented in terms of thermodynamic properties $$(T_s$$ , $$rho _s$$ , $$C_{mathrm{V1}}$$ and $$C_{mathrm{V2}})$$ evaluated at saturation and in terms of key-derived thermodynamic properties $$C_mathrm{P}$$ , $$C_mathrm{S}$$ , $$W_mathrm{S}^{{prime }}$$ , $$K_{mathrm{TS}}^{{prime }}$$ , $$left( {partial P/partial T} right) _{mathrm{V}}^{prime }$$ , and $$left( {partial V/partial T} right) _mathbf{P}^{prime })$$ on the liquid + vapor phase-transition curve. A thermodynamic relation by Yang and Yang is used to confirm the internal consistency of measured two-phase heat capacities $$C_{mathrm{V2}} $$ , which are observed to fall perfectly on a line as a function of specific volume at a constant temperature. The observed linear behavior is exploited to evaluate contributions to the quantity $$C_{mathrm{V2}} = f(V, T)$$ from chemical potential $$C_{{mathrm{V}upmu }} =-Tfrac{mathrm{d}^{{2}}mu }{mathrm{d}T^{2}}$$ and from vapor pressure $$C_{mathrm{VP}} =VTfrac{mathrm{d}^{2}P_{mathrm{S}} }{mathrm{d}T^{2}}$$ . The physical nature and specific details of the temperature and specific volume dependence of the two-phase isochoric heat capacity and some features of the other derived thermodynamic properties of IL at liquid saturation curve are considered in detail." @default.
- W2518996941 created "2016-09-23" @default.
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- W2518996941 date "2016-09-13" @default.
- W2518996941 modified "2023-09-25" @default.
- W2518996941 title "Thermodynamic Properties at Saturation Derived from Experimental Two-Phase Isochoric Heat Capacity of 1-Hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide" @default.
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- W2518996941 doi "https://doi.org/10.1007/s10765-016-2109-2" @default.
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