RT Journal Article
T1 Simulation of the carbon dioxide hydrate-water interfacial energy
A1 Algaba Fernández, Jesús
A1 Acuña, Estebán
A1 Míguez Díaz, José Manuel
A1 Mendiboure, Bruno
A1 Zerón, Iván M.
A1 Jiménez Blas, Felipe
AB Hypothesis: Carbon dioxide hydrates are ice-like nonstoichiometric inclusion solid compounds with importance to global climate change, and gas transportation and storage. The thermodynamic and kinetic mechanisms that control carbon dioxide nucleation critically depend on hydrate-water interfacial free energy. Only two independent indirect experiments are available in the literature. Interfacial energies show large uncertainties due to the conditions at which experiments are performed. Under these circumstances, we hypothesize that accurate molecular models for water and carbon dioxide combined with computer simulation tools can offer an alternative but complementary way to estimate interfacial energies at coexistence conditions from a molecular perspective. Calculations: We have evaluated the interfacial free energy of carbon dioxide hydrates at coexistence conditions (three-phase equilibrium or dissociation line) implementing advanced computational methodologies, including the novel Mold Integration methodology. Our calculations are based on the definition of the interfacial free energy, standard statistical thermodynamic techniques, and the use of the most reliable and used molecular models for water (TIP4P/Ice) and carbon dioxide (TraPPE) available in the literature. Findings: We find that simulations provide an interfacial energy value, at coexistence conditions, consistent with the experiments from its thermodynamic definition. Our calculations are reliable since are based on the use of two molecular models that accurately predict: (1) The ice-water interfacial free energy; and (2) the dissociation line of carbon dioxide hydrates. Computer simulation predictions provide alternative but reliable estimates of the carbon dioxide interfacial energy. Our pioneering work demonstrates that is possible to predict interfacial energies of hydrates from a truly computational molecular perspective and opens a new door to the determination of free energies of hydrates. 
PB Elsevier
SN 0021-9797
SN 1095-7103 (electrónico)
YR 2022
FD 2022
LK https://hdl.handle.net/10272/21669
UL https://hdl.handle.net/10272/21669
LA eng
NO Algaba, J., Acuña, E., Míguez, J. M., Mendiboure, B., Zerón, I. M., & Blas, F. J. (2022). Simulation of the carbon dioxide hydrate-water interfacial energy. In Journal of Colloid and Interface Science (Vol. 623, pp. 354–367). Elsevier BV. https://doi.org/10.1016/j.jcis.2022.05.029
NO We thank Pedro J. Pérez for the critical reading of the manuscript.We also acknowledge Centro de Supercomputación de Galicia(CESGA, Santiago de Compostela, Spain) and MCIA (Mésocentrede Calcul Intensif Aquitain) of the Universités de Bordeaux and Pauet Pays de l’Adour (France) for providing access to computing facilities.We thank financial support from the Ministerio de Economía,Industria y Competitividad (FIS2017- 89361-C3-1-P), Junta deAndalucía (P20-00363), and Universidad de Huelva (P.O. FEDERUHU-1255522), all three cofinanced by EU FEDER funds. J.A.acknowledges Contrato Predoctoral de Investigación from XIX PlanPropio de Investigación de la Universidad de Huelva and a FPUGrant (Ref. FPU15/03754) from Ministerio de Educación, Culturay Deporte. J. A., J. M. M., and F. J. B. thankfully acknowledge thecomputer resources at Magerit and the technical support providedby the Spanish Supercomputing Network (RES) (Project QCM-2018–2- 0042). Funding for open access charge: Universidad deHuelva / CBUA
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026