1
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Algaba J, Morales-Aragon A, Romero-Guzmán C, Gómez-Álvarez P, Blas FJ. Interfacial properties of square-well chains from molecular dynamics simulation. Mol Phys 2023. [DOI: 10.1080/00268976.2023.2195022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Affiliation(s)
- Jesús Algaba
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva, Huelva, Spain
| | - Agustin Morales-Aragon
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva, Huelva, Spain
| | - Cristóbal Romero-Guzmán
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva, Huelva, Spain
| | - Paula Gómez-Álvarez
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva, Huelva, Spain
| | - Felipe J. Blas
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva, Huelva, Spain
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2
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Wu S, Xu Z, Wang Q, Sun Z. Nanoconfined Fluid Critical Properties Variation over Surface Wettability. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shan Wu
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Zhuang Xu
- PetroChina Tarim Oilfield, Donghe Oil and Gas Development Department, Xinjiang, Korla 841000, China
| | - Qingzhen Wang
- No. 7 Oil Production Plant of PetroChina Changqing Oilfield Branch, Shaanxi, Xi’an 710021, China
| | - Zheng Sun
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
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3
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Naincy Attri, Sudhir K. Singh. Estimation of Pore Critical Temperature of Nanoconfined Alkanes Using Vapour-Liquid Interfacial Free Energy. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2021. [DOI: 10.1134/s1990793121090037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Song Y, Song Z, Guo J, Feng D, Chang X. Phase Behavior and Miscibility of CO 2–Hydrocarbon Mixtures in Shale Nanopores. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00717] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yilei Song
- State Key Laboratory of Heavy Oil Processing and Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Zhaojie Song
- State Key Laboratory of Heavy Oil Processing and Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jia Guo
- State Key Laboratory of Heavy Oil Processing and Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Dong Feng
- State Key Laboratory of Heavy Oil Processing and Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Xuya Chang
- State Key Laboratory of Heavy Oil Processing and Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
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5
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Singh SK, Mehta A. Corresponding state behaviour of capillary condensation of confined alkanes. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1628228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Sudhir K. Singh
- Department of Chemical Engineering, Thapar Institute of Engineering and Technology, Patiala, India
| | - Anjali Mehta
- Department of Chemical Engineering, Thapar Institute of Engineering and Technology, Patiala, India
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7
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Shevkunov S, Singh JK. Bicanonical ensemble Monte Carlo simulation of water condensation in the field of crystal lattice defects. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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8
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Singh SK. Critical temperature estimation of bulk and confined atomic fluid using vapour−liquid interfacial free energy. MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2017.1355554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Sudhir K. Singh
- Department of Chemical Engineering, Thapar University, Patiala, India
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9
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Brumby PE, Wensink HH, Haslam AJ, Jackson G. Structure and Interfacial Tension of a Hard-Rod Fluid in Planar Confinement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:11754-11770. [PMID: 28885848 DOI: 10.1021/acs.langmuir.7b02254] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The structural properties and interfacial tension of a fluid of rodlike hard-spherocylinder particles in contact with hard structureless flat walls are studied by means of Monte Carlo simulation. The calculated surface tension between the rod fluid and the substrate is characterized by a nonmonotonic trend as a function of the bulk concentration (density) over the range of isotropic bulk concentrations. As suggested by earlier theoretical studies, a surface-ordering scenario is confirmed by our simulations: the local orientational order close to the wall changes from uniaxial to biaxial nematic when the bulk concentration reaches about 85% of the value at the onset of the isotropic-nematic phase transition. The surface ordering coincides with a wetting transition whereby the hard wall is wetted by a nematic film. Accurate values of the fluid-solid surface tension, the adsorption, and the average particle-wall contact distance are reported (over a broad range of densities into the dense nematic region for the first time), which can serve as a useful benchmark for future theoretical and experimental studies on confined rod fluids. The simulation data are supplemented with predictions from second-virial density functional theory, which are in good qualitative agreement with the simulation results.
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Affiliation(s)
- Paul E Brumby
- Department of Mechanical Engineering, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Henricus H Wensink
- Laboratoire de Physique des Solides, Université Paris Sud & CNRS , 91405 Orsay Cedex, France
| | - Andrew J Haslam
- Department of Chemical Engineering and Qatar Carbonates and Carbon Storage Research Centre, Imperial College London , South Kensington Campus, London SW7 2AZ, United Kingdom
| | - George Jackson
- Department of Chemical Engineering and Qatar Carbonates and Carbon Storage Research Centre, Imperial College London , South Kensington Campus, London SW7 2AZ, United Kingdom
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10
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Chakraborti T, Adhikari J. Phase Equilibria and Critical Point Predictions of Mixtures of Molecular Fluids Using Grand Canonical Transition Matrix Monte Carlo. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b01114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Tamaghna Chakraborti
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400476, India
| | - Jhumpa Adhikari
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400476, India
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11
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Martínez-Ruiz FJ, Blas FJ, Moreno-Ventas Bravo AI, Míguez JM, MacDowell LG. Vapour–liquid interfacial properties of square-well chains from density functional theory and Monte Carlo simulation. Phys Chem Chem Phys 2017; 19:12296-12309. [DOI: 10.1039/c7cp01182b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Vapour–liquid surface tension for tangent (open symbols) and vibrating (filled symbols) square-well chains.
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Affiliation(s)
- Francisco José Martínez-Ruiz
- Laboratorio de Simulación Molecular y Química Computacional
- CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas
- Universidad de Huelva
- 21007 Huelva
- Spain
| | - Felipe J. Blas
- Laboratorio de Simulación Molecular y Química Computacional
- CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas
- Universidad de Huelva
- 21007 Huelva
- Spain
| | - A. Ignacio Moreno-Ventas Bravo
- Laboratorio de Simulación Molecular y Química Computacional
- CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias de la Tierra
- Universidad de Huelva
- 21007 Huelva
- Spain
| | - José Manuel Míguez
- Laboratorio de Simulación Molecular y Química Computacional
- CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas
- Universidad de Huelva
- 21007 Huelva
- Spain
| | - Luis G. MacDowell
- Departamento de Química Física
- Facultad de Ciencias Químicas
- Universidad Complutens
- 28040 Madrid
- Spain
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12
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Luo S, Lutkenhaus JL, Nasrabadi H. Confinement-Induced Supercriticality and Phase Equilibria of Hydrocarbons in Nanopores. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11506-11513. [PMID: 27754674 DOI: 10.1021/acs.langmuir.6b03177] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For over a century, the phase behavior of bulk fluids has been described as PVT (pressure-volume-temperature) three-dimensional properties, but it has become increasingly clear that the liquid-vapor phase behavior in confined geometries is significantly altered from the bulk. Efforts have been devoted to accessing confined phase transitions using sorption, molecular simulations, and theoretical methods. However, a comprehensive picture of PVT relationships for confined hydrocarbons remains uncertain. Herein, we introduce d (confining pore diameter) as a fourth dimension, and we present PVT-d behavior of confined fluids in nanopores. For the first time, a T-d phase diagram is presented for n-hexane, n-octane, and n-decane under multiple confinement scales (37.9, 14.8, 9.8, 6.0, 4.1, 3.3, and 2.2 nm cylindrical pore diameter) using experimental differential scanning calorimetry and PVT-d equation of state theory at atmospheric pressure. As pore diameter decreases from 37.9 to 4.1 nm, the bubble point increases by as much as 15 K above bulk, until we observe behavior consistent with a supercritical state, pointing to confinement-induced supercriticality. Remarkably, experimental and theoretical findings overlap very well, showing that this approach effectively captures the phase boundaries between the liquid, vapor, and supercritical fluid regions. The model and completed EOS are additionally extended to calculation of isothermal capillary adsorption, and its validity is discussed.
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Affiliation(s)
- Sheng Luo
- Harold Vance Department of Petroleum Engineering, ‡Artie McFerrin Department of Chemical Engineering, and §Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Jodie L Lutkenhaus
- Harold Vance Department of Petroleum Engineering, ‡Artie McFerrin Department of Chemical Engineering, and §Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Hadi Nasrabadi
- Harold Vance Department of Petroleum Engineering, ‡Artie McFerrin Department of Chemical Engineering, and §Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
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13
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Fluid phase equilibria of triangle-well fluids confined inside slit pores: A transition matrix Monte Carlo simulation study. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.06.100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Martínez-Ruiz FJ, Blas FJ. Interfacial properties of binary mixtures of square-well molecules from Monte Carlo simulation. J Chem Phys 2016; 144:154705. [DOI: 10.1063/1.4947017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- F. J. Martínez-Ruiz
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Física Aplicada, Universidad de Huelva, 21007 Huelva, Spain
| | - F. J. Blas
- Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Física Aplicada, Universidad de Huelva, 21007 Huelva, Spain
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16
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Keshavarzi E, Helmi A. Population inversion, selective adsorption, and demixing of Lennard-Jones fluids in nanospherical pores. J Phys Chem B 2014; 118:4582-9. [PMID: 24720688 DOI: 10.1021/jp411537n] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The density functional theory has been employed to investigate the population inversion, selective adsorption, and demixing of confined mixture fluids in a spherical nanocavity. In the case of hard sphere fluids for which only the entropy effect has the dominant role, the selective adsorption process strongly depends on size ratio, population of the adsorbed component, and pore size. The effects of such parameters as interaction strength, size ratio, and thermodynamic state on population inversion and selective adsorption have been investigated for L-J mixture fluids. The results for L-J asymmetric binary mixture fluids indicate that the mole fraction of large species (molecules with bigger radii) inside the cavity becomes greater with increasing size ratio or with decreasing temperature than does that for the other component despite its lower population in the bulk fluid (i.e., the so-called population inversion phenomenon). Our results indicate that the inversion population density decreases with size ratio, and the mole fraction of the component with the bigger radius in the pore increases with temperature. Thus, by selecting a small spherical cavity under special conditions, it will be possible to give rise to the selective separation of component 2 in spite of its lower concentration in the bulk asymmetric L-J mixture. Finally, we have investigated the phase separation, demixing phenomenon, of an asymmetric L-J mixture inside a spherical cavity. Also we investigated the cases for which the layered demixing phenomenon occurs in the asymmetric L-J fluid in a nanospherical pore as a result of the difference between the entropy and energy effects.
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Affiliation(s)
- Ezat Keshavarzi
- Physical Chemistry Group, Chemistry Department, Isfahan University of Technology , Isfahan 8415683111, Iran
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17
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Sengupta A, Behera P, Adhikari J. Molecular simulation study of triangle-well fluids confined in slit pores. Mol Phys 2014. [DOI: 10.1080/00268976.2013.877166] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Guisandez LE, Zarragoicoechea GJ, Albano EV. Critical behaviour of the Ising ferromagnet confined in quasi-cylindrical pores: a Monte Carlo study. J Chem Phys 2013; 139:154706. [PMID: 24160532 DOI: 10.1063/1.4821826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The critical behaviour of the Ising ferromagnet confined in pores of radius R and length L is studied by means of Monte Carlo computer simulations. Quasi-cylindrical pores are obtained by replicating n-times a triangular lattice disc of radius R, where L = na and a is the spacing between consecutive replications. So, spins placed at the surface of the pores have less nearest-neighbours (NN) as compared to 8 NN for spins in the bulk. These "missing neighbour" effects undergone by surface spins cause a strong suppression of surface ordering, leading to an ordinary surface transition. Also, the effect propagates into the bulk for small tubes (R ≤ 12) and the effective critical temperature of the pores is shifted towards lower values than in the bulk case. By applying the standard finite-size scaling theory, subsequently supported by numerical data, we concluded that data collapse of relevant observables, e.g., magnetization (m), susceptibility, specific heat, etc., can only be observed by comparing simulation results obtained by keeping the aspect ratio C ≡ R∕L constant. Also, by extrapolating "effective" R-dependent critical temperatures to the thermodynamic limit (R → ∞, C fixed), we obtained T(C)(∞) = 6.208(4). As suggested by finite-size scaling arguments, the magnetization is measured at the critical point scales according to [|m|]Tc R(β/ν) is proportional to [R/L](1/2), where β and ν are the standard exponents for the order parameter and the correlation length, respectively. Furthermore, it is shown that close to criticality the axial correlation length decreases exponentially with the distance. That result is the signature of the formation of (randomly distributed) alternating domains of different magnetization, which can be directly observed by means of snapshot configurations, whose typical length (ξ) is given by the characteristic length of the exponential decay of correlations. Moreover, we show that at criticality ξ = 0.43(2)R.
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Affiliation(s)
- Leandro E Guisandez
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), Universidad Nacional de La Plata, CONICET CCT-La Plata, Calle 59 Nro 789, (1900) La Plata, Argentina
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Blas FJ, Mendiboure B. Extension of the Test-Area methodology for calculating solid-fluid interfacial tensions in cylindrical geometry. J Chem Phys 2013; 138:134701. [DOI: 10.1063/1.4795836] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Singh SK, Singh JK. A comparative study of critical temperature estimation of atomic fluid and chain molecules using fourth-order Binder cumulant and simplified scaling laws. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2012.708755] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Patra TK, Hens A, Singh JK. Vapor-liquid phase coexistence and transport properties of two-dimensional oligomers. J Chem Phys 2012; 137:084701. [DOI: 10.1063/1.4747195] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Míguez JM, Piñeiro MM, Moreno-Ventas Bravo AI, Blas FJ. On interfacial tension calculation from the test-area methodology in the grand canonical ensemble. J Chem Phys 2012; 136:114707. [DOI: 10.1063/1.3694533] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Brovchenko I, Oleinikova A. Effect of Pore Size on the Condensation/Evaporation Transition of Confined Water in Equilibrium with Saturated Bulk Water. J Phys Chem B 2011; 115:9990-10000. [DOI: 10.1021/jp112052f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ivan Brovchenko
- Physical Chemistry, Dortmund University of Technology, Otto-Hahn-Strasse 6, Dortmund, D-44227, Germany
| | - Alla Oleinikova
- Physical Chemistry, Dortmund University of Technology, Otto-Hahn-Strasse 6, Dortmund, D-44227, Germany
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Singh SK, Khan S, Jana S, Singh JK. Vapour–liquid phase equilibria of simple fluids confined in patterned slit pores. MOLECULAR SIMULATION 2010. [DOI: 10.1080/08927022.2010.514778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sudhir K. Singh
- a Department of Chemical Engineering , Indian Institute of Technology , Kanpur, 208016, India
| | - Sandip Khan
- a Department of Chemical Engineering , Indian Institute of Technology , Kanpur, 208016, India
| | - Subimal Jana
- a Department of Chemical Engineering , Indian Institute of Technology , Kanpur, 208016, India
| | - Jayant K. Singh
- a Department of Chemical Engineering , Indian Institute of Technology , Kanpur, 208016, India
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Travalloni L, Castier M, Tavares FW, Sandler SI. Critical behavior of pure confined fluids from an extension of the van der Waals equation of state. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.09.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Singh SK, Singh JK, Kwak SK, Deo G. Phase transition and crossover behavior of colloidal fluids under confinement. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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27
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Huang HC, Chen WW, Singh JK, Kwak SK. Direct determination of fluid-solid coexistence of square-well fluids confined in narrow cylindrical hard pores. J Chem Phys 2010; 132:224504. [DOI: 10.1063/1.3429741] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Singh SK, Saha AK, Singh JK. Molecular Simulation Study of Vapor−Liquid Critical Properties of a Simple Fluid in Attractive Slit Pores: Crossover from 3D to 2D. J Phys Chem B 2010; 114:4283-92. [DOI: 10.1021/jp9109942] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sudhir K. Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Ashim K. Saha
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Jayant K. Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
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Saha AK, Singh SP, Singh JK, Kwak SK. Quasi-2D and prewetting transitions of square-well fluids on a square-well substrate. Mol Phys 2009. [DOI: 10.1080/00268970903222165] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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30
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Jana S, Singh JK, Kwak SK. Vapor-liquid critical and interfacial properties of square-well fluids in slit pores. J Chem Phys 2009; 130:214707. [DOI: 10.1063/1.3148884] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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31
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Siders PD. Driven on- and off-lattice gas. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 79:061101. [PMID: 19658467 DOI: 10.1103/physreve.79.061101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Indexed: 05/28/2023]
Abstract
An on- and off-lattice analog of the driven lattice gas has been studied by molecular-dynamics simulation. In the model, particles move on a two-dimensional lattice potential under a constant driving force. They also interact with each other by an attractive square-well pair potential. A heat bath removes as heat the work done by the driving field. The case of zero field recovers equilibrium two-dimensional lattice and continuous-space results. With nonzero field and a strong lattice potential, the system is comparable to the driven lattice gas. As in the driven lattice gas, the anisotropic single-strip configuration persists to higher kinetic energy as the field strength increases. In the case of zero lattice strength, the model reduces to an off-lattice two-dimensional driven square-well fluid. Single-strip steady states are not observed off lattice.
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Affiliation(s)
- Paul D Siders
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA
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Huang HC, Kwak SK, Singh JK. Characterization of fluid-solid phase transition of hard-sphere fluids in cylindrical pore via molecular dynamics simulation. J Chem Phys 2009; 130:164511. [DOI: 10.1063/1.3120486] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Rosch TW, Errington JR. Phase behavior of model confined fluids. Influence of substrate-fluid interaction strength. J Phys Chem B 2008; 112:14911-9. [PMID: 18973362 DOI: 10.1021/jp804419b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We examine the relationship between the macroscopic phase behavior of nanoconfined fluids and the nature of microscopic interactions between a confining substrate and fluid. Two model slit-pore systems are explored using grand canonical transition-matrix Monte Carlo simulation. One system consists of a square-well fluid interacting with a square-well substrate, and the other contains an embedded point charge model of lysozyme interacting with a mica surface. Fluid phase diagrams are constructed for a broad range of substrate conditions. Our results indicate that one observes a maximum in the critical temperature of the fluid phase envelope upon variation of substrate strength for a given slit width. Both systems studied exhibit such maxima at intermediate wall strength. The physical rationale for this observation suggests that this behavior should be generally expected. We introduce two metrics that enable one to predict conditions that produce maxima in critical temperature. The first is related to the contact angle a fluid develops at a single confining substrate. The second is based upon virial coefficient information and requires knowledge of the substrate-fluid and fluid-fluid interaction potentials only.
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Affiliation(s)
- Thomas W Rosch
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, USA
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Kumar AN, Singh JK. The effects of interaction range, porosity and molecular association on the phase equilibrium of a fluid confined in a disordered porous media. Mol Phys 2008. [DOI: 10.1080/00268970802418963] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Singh JK, Sarma G, Kwak SK. Thin-thick surface phase coexistence and boundary tension of the square-well fluid on a weak attractive surface. J Chem Phys 2008; 128:044708. [DOI: 10.1063/1.2824503] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hamada Y, Koga K, Tanaka H. Phase equilibria and interfacial tension of fluids confined in narrow pores. J Chem Phys 2007; 127:084908. [PMID: 17764295 DOI: 10.1063/1.2759926] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Correlation between phase behaviors of a Lennard-Jones fluid in and outside a pore is examined over wide thermodynamic conditions by grand canonical Monte Carlo simulations. A pressure tensor component of the confined fluid, a variable controllable in simulation but usually uncontrollable in experiment, is related with the pressure of a bulk homogeneous system in equilibrium with the confined system. Effects of the pore dimensionality, size, and attractive potential on the correlations between thermodynamic properties of the confined and bulk systems are clarified. A fluid-wall interfacial tension defined as an excess grand potential is evaluated as a function of the pore size. It is found that the tension decreases linearly with the inverse of the pore diameter or width.
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Affiliation(s)
- Yoshinobu Hamada
- Department of Chemistry, Faculty of Science, Okayama University, Japan
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