Properties of Fluids Modelled by Force Fields with Intramolecular Contributions: Application to Heat Capacities.

0480402 - ÚCHP 2018 RIV US eng J - Článek v odborném periodiku
Smith, W.R. - Jirsák, Jan - Nezbeda, Ivo - Qi, W.
Properties of Fluids Modelled by Force Fields with Intramolecular Contributions: Application to Heat Capacities.
Journal of Chemical Physics. Roč. 147, č. 3 (2017), č. článku 034508. ISSN 0021-9606. E-ISSN 1089-7690
Grant CEP: GA ČR GA15-19542S
Grant ostatní: NSERC(CA) STPGP479466-15
Institucionální podpora: RVO:67985858
Klíčová slova: thermodynamic derivative properties * linear contraint solver * monte-carlo simulation
Obor OECD: Physical chemistry
Impakt faktor: 2.843, rok: 2017

The calculation of caloric properties such as heat capacity, Joule-Thomson coefficients, and the speed of sound by classical force-field-based molecular simulation methodology has received scant attention in the literature, particularly for systems composed of complex molecules whose force fields (FFs) are characterized by a combination of intramolecular and intermolecular terms. The calculation of a thermodynamic property for a system whose molecules are described by such a FF involves the calculation of the residual property prior to its addition to the corresponding ideal-gas property, the latter of which is separately calculated, either using thermochemical compilations or nowadays accurate quantum mechanical calculations. Although the simulation of a volumetric residual property proceeds by simply replacing the intermolecular FF in the rigid molecule case by the total (intramolecular plus intermolecular) FF, this is not the case for a caloric property. We describe the correct methodology required to perform such calculations and illustrate it in this paper for the case of the internal energy and the enthalpy and their corresponding molar heat capacities. We provide numerical results for c(P), one of the most important caloric properties. We also consider approximations to the correct calculation procedure previously used in the literature and illustrate their consequences for the examples of the relatively simple molecule 2-propanol, CH3CH(OH)CH3, and for the more complex molecule monoethanolamine, HO(CH2)(2)NH2, an important fluid used in carbon capture.
Trvalý link: http://hdl.handle.net/11104/0276184