Number of the records: 1
Properties of Fluids Modelled by Force Fields with Intramolecular Contributions: Application to Heat Capacities.
- 1.
SYSNO ASEP 0480402 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Properties of Fluids Modelled by Force Fields with Intramolecular Contributions: Application to Heat Capacities. Author(s) Smith, W.R. (CA)
Jirsák, Jan (UCHP-M) RID, ORCID, SAI
Nezbeda, Ivo (UCHP-M) RID, ORCID, SAI
Qi, W. (CA)Article number 034508 Source Title Journal of Chemical Physics. - : AIP Publishing - ISSN 0021-9606
Roč. 147, č. 3 (2017)Number of pages 12 s. Language eng - English Country US - United States Keywords thermodynamic derivative properties ; linear contraint solver ; monte-carlo simulation Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA15-19542S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000406129100029 EID SCOPUS 85025167518 DOI 10.1063/1.4993572 Annotation 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. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2018
Number of the records: 1