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Al-Bahri OH, Borah B, Elzain M, Varanasi SR. Thermodynamics of translational and rotational dynamics of C9 hydrocarbons in the pores of zeolite-beta. J Mol Graph Model 2022; 114:108188. [DOI: 10.1016/j.jmgm.2022.108188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 04/03/2022] [Accepted: 04/03/2022] [Indexed: 10/18/2022]
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2
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Affiliation(s)
- F. N. El-Gammal
- Mathematics Department, Faculty of Science, Menofia University, Shebin El-Kom, Egypt
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Liu A, Peng X, Jin Q, Jain SK, Vicent-Luna JM, Calero S, Zhao D. Adsorption and Diffusion of Benzene in Mg-MOF-74 with Open Metal Sites. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4686-4700. [PMID: 30618234 DOI: 10.1021/acsami.8b20447] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We performed molecular simulations to investigate the adsorption and diffusion of benzene in metal-organic framework Mg-MOF-74. At 300 K and 20 Pa, the saturated loading of benzene reaches 8.2 mmol/g, almost twice of (12,12) single-walled carbon nanotube with a similar pore size, and 93% of the benzene molecules in Mg-MOF-74 can desorb at 390 K. The energy analysis indicates that the van der Waals contribution still dominates 70-80% of the total fluid-wall interaction energy compared with the Coulombic contribution. We further analyzed the structure of benzene confined in Mg-MOF-74 by the molecular snapshots, pair correlation functions, orientational order parameters, and local density profiles. It is found that low temperature and high pressure make the structure of adsorbed benzene more similar to that of the liquid benzene. Moreover, the benzene molecules in the contact adsorption layer lie flat on the surface of adsorbent, whereas those molecules near the pore center have no particular orientations. Due to the existence of open metal sites, the structures of adsorbed benzene are more compact and ordered than those of bulk liquid benzene. Consequently, the self-diffusion coefficient of saturated benzene in Mg-MOF-74 at 300 K is significantly lower than that of bulk liquid benzene and confined liquid benzene in slit pores and disordered carbons by 4-5 orders of magnitude. We investigated the separation and diffusion of benzene/cyclohexane in the mixture in Mg-MOF-74 and found that the pores almost completely adsorbed benzene, although its self-diffusion coefficient was slightly lower than that of cyclohexane.
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Affiliation(s)
- Anqi Liu
- College of Chemical Engineering , University of Petroleum (East China) , Qingdao 266580 , China
- CNPC Research Institute of Safety and Environment Technology , Beijing 102206 , P. R. China
| | - Xuan Peng
- College of Information Science and Technology , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Qibing Jin
- College of Information Science and Technology , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Surendra Kumar Jain
- Department of Chemical Engineering , Indian Institute of Technology Kanpur , Kanpur 208016 , India
| | - Jose Manuel Vicent-Luna
- Department of Physical, Chemical and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera Km 1 , Seville ES-41013 , Spain
| | - Sofía Calero
- Department of Physical, Chemical and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera Km 1 , Seville ES-41013 , Spain
| | - Dongfeng Zhao
- College of Chemical Engineering , University of Petroleum (East China) , Qingdao 266580 , China
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Doma SB, El-Gammal FN, Amer AA. Ground-state calculations of confined hydrogen molecule H 2 using variational Monte Carlo method. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1459000] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- S. B. Doma
- Mathematics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - F. N. El-Gammal
- Mathematics Department, Faculty of Science, Menoufia University, Shebin El-Kom, Egypt
| | - A. A. Amer
- Mathematics Department, Faculty of Science, Menoufia University, Shebin El-Kom, Egypt
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5
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The influence of geometric heterogeneity of closed carbon nanotube bundles on benzene adsorption from the gaseous phase-Monte Carlo simulations. ADSORPTION 2015. [DOI: 10.1007/s10450-015-9746-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Tseng TW, Luo TT, Tsai CH, Chen CC, Lee GH, Wang CC, Lu KL. Benzene absorption in a protuberant-grid-type zinc(ii)–organic framework triggered by the migration of guest water molecules. Dalton Trans 2015; 44:62-5. [PMID: 25386683 DOI: 10.1039/c4dt02169j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Benzene molecules are reported to be easily and regularly absorbed into specific channels in a 2D protuberant-grid-type Zn(ii)–organic framework, which consists of racemic interdigitated bilayers.
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Affiliation(s)
- Tien-Wen Tseng
- Department of Chemical Engineering
- National Taipei University of Technology
- Taipei
- Taiwan
| | | | - Chang-Hsiu Tsai
- Department of Chemical Engineering
- National Taipei University of Technology
- Taipei
- Taiwan
- Institute of Chemistry
| | - Chun-Chi Chen
- Institute of Chemistry
- Academia Sinica
- Taipei 115
- Taiwan
| | - Gene-Hsiang Lee
- Instrumentation Center
- National Taiwan University
- Taipei 106
- Taiwan
| | | | - Kuang-Lieh Lu
- Institute of Chemistry
- Academia Sinica
- Taipei 115
- Taiwan
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Varanasi SR, Yashonath S. Structure and dynamics of cumene and 1,2,4-trimethylbenzene mixture in NaY zeolite: a molecular dynamics simulation study. MOLECULAR SIMULATION 2014. [DOI: 10.1080/08927022.2014.942660] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Enhanced catalytic performance of CeO2 confined inside carbon nanotubes for dehydrogenation of ethylbenzene in the presence of CO2. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2012.07.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shim Y, Jung Y, Kim HJ. Carbon nanotubes in benzene: internal and external solvation. Phys Chem Chem Phys 2011; 13:3969-78. [DOI: 10.1039/c0cp01845g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Lucena SM, Cavalcante CL. Adsorption equilibrium in one-dimensional molecular sieve: a study of force fields effect on linear alkanes molecules. MOLECULAR SIMULATION 2008. [DOI: 10.1080/08927020802301896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Sebastiao M.P. Lucena
- a Grupo de Pesquisa em Separação por Adsorção (GPSA), Departamento de Engenharia Química , Universidade Federal do Ceará , Fortaleza, Ceará, Brazil
| | - Célio L. Cavalcante
- a Grupo de Pesquisa em Separação por Adsorção (GPSA), Departamento de Engenharia Química , Universidade Federal do Ceará , Fortaleza, Ceará, Brazil
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Yashonath S, Ghorai PK. Diffusion in Nanoporous Phases: Size Dependence and Levitation Effect. J Phys Chem B 2007; 112:665-86. [DOI: 10.1021/jp076031z] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- S. Yashonath
- Solid State and Structural Chemistry Unit, Center for Condensed Matter Theory, Indian Institute of Science, Bangalore-560012, India
| | - Pradip Kr. Ghorai
- Solid State and Structural Chemistry Unit, Center for Condensed Matter Theory, Indian Institute of Science, Bangalore-560012, India
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12
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Monte Carlo and energy minimization studies of binary xylene adsorption in AEL and AFI networks. ADSORPTION 2007. [DOI: 10.1007/s10450-007-9031-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Lucena SMP, Pereira JAFR, Cavalcante CL. Sensitivity to guest–host force fields in adsorption equilibrium of cyclic hydrocarbons in one-dimensional molecular sieve. MOLECULAR SIMULATION 2007. [DOI: 10.1080/08927020601154280] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Díaz E, Ordóñez S, Vega A. Adsorption of volatile organic compounds onto carbon nanotubes, carbon nanofibers, and high-surface-area graphites. J Colloid Interface Sci 2007; 305:7-16. [PMID: 17046777 DOI: 10.1016/j.jcis.2006.09.036] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2006] [Revised: 08/19/2006] [Accepted: 09/15/2006] [Indexed: 10/24/2022]
Abstract
The adsorption of different alkanes (linear and cyclic), aromatics, and chlorohydrocarbons onto different nonmicroporous carbons--multiwalled carbon nanotubes (CNTs), carbon nanofibers (CNFs), and high-surface-area graphites (HSAGs)--is studied in this work by inverse gas chromatography (IGC). Capacity of adsorption was derived from the isotherms of adsorption, whereas thermodynamic properties (enthalpy of adsorption, surface free energy characteristics) have been determined from chromatographic retention data. HSAGs present the highest adsorption capacity, followed by CNTs and CNFs (although CNTs present an intermediate surface area between the two HSAG studied). Among the different adsorbates tested, benzene exhibits the highest adsorption capacity, and the same trend is observed in the enthalpy of adsorption. From surface free energy data, enthalpies of adsorption of polar compounds were divided into dispersive and specific contributions. The interactions of cyclic (benzene and cyclohexane) and chlorinated compounds (trichloroethylene, tetrachloroethylene, and chloroform) with the surfaces are mainly dispersive over all the carbons tested, CNTs being the material with the highest dispersive contribution, as was deduced also from the entropy parameter. Adsorption parameters were correlated with morphological and chemical properties of the materials.
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Affiliation(s)
- Eva Díaz
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, Julián Clavería s/n, 33006 Oviedo, Spain
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Jakobtorweihen S, Lowe CP, Keil FJ, Smit B. A novel algorithm to model the influence of host lattice flexibility in molecular dynamics simulations: Loading dependence of self-diffusion in carbon nanotubes. J Chem Phys 2006; 124:154706. [PMID: 16674250 DOI: 10.1063/1.2185619] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
We describe a novel algorithm that includes the effect of host lattice flexibility into molecular dynamics simulations that use rigid lattices. It uses a Lowe-Andersen thermostat for interface-fluid collisions to take the most important aspects of flexibility into account. The same diffusivities and other properties of the flexible framework system are reproduced at a small fraction of the computational cost of an explicit simulation. We study the influence of flexibility on the self-diffusion of simple gases inside single walled carbon nanotubes. Results are shown for different guest molecules (methane, helium, and sulfur hexafluoride), temperatures, and types of carbon nanotubes. We show, surprisingly, that at low loadings flexibility is always relevant. Notably, it has a crucial influence on the diffusive dynamics of the guest molecules.
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Affiliation(s)
- S Jakobtorweihen
- Chemical Reaction Engineering, Hamburg University of Technology, Eissendorfer Strasse 38, D-21073 Hamburg, Germany.
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Gauden PA, Terzyk AP, Rychlicki G, Kowalczyk P, Lota K, Raymundo-Pinero E, Frackowiak E, Béguin F. Thermodynamic properties of benzene adsorbed in activated carbons and multi-walled carbon nanotubes. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.02.003] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ghorai PK, Yashonath S. The Stokes−Einstein Relationship and the Levitation Effect: Size-Dependent Diffusion Maximum in Dense Fluids and Close-Packed Disordered Solids. J Phys Chem B 2005; 109:5824-35. [PMID: 16851635 DOI: 10.1021/jp046312w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report a molecular dynamics study of a binary mixture consisting of a large (host) particle and a smaller (guest) particle whose radius is varied over a range. These simulations investigate the possible existence of a diffusion anomaly or levitation effect in dense fluids, previously seen for guest molecules diffusing within porous solids. The voids in the larger component have been characterized in terms of void and neck distributions by means of Voronoi polyhedral analysis. Four different mixtures with differing ratios of guest to host diffusivities (D) have been studied. The results suggest that the diffusion anomaly is seen in both close-packed solids with disorder and dense fluids. In the latter, the void network is constantly and dynamically changing and possesses a considerable degree of disorder. The two regimes, viz., the linear regime (LR) and the anomalous regime (AR), found for porous solids are shown to exist for a dense medium as well. The linear regime is characterized by D(g) proportional to 1/sigma(gg)(2), where sigma(gg) is the diameter of the guest. The anomalous regime exhibits a maximum in D up to rather high temperatures (T = 1.663), even though in porous solids the maximum disappears at higher temperatures. In agreement with previous studies on porous solids, a particle in the AR is associated with lower activation energy, lower friction, and less backscattering in the velocity autocorrelation function when compared to a particle in the LR. Wavevector dependent self-diffusivity, Delta, and decay of the intermediate scattering function, F(s)(k, t), exhibit contrasting behaviors for the LR and AR. For LR, Delta exhibits a minimum at values of k at which there are spatial correlations in S(k) while a smooth decrease with k is seen for AR. For LR, F(s)(k, t) shows a biexponential decay corresponding to two different time scales of motion. Probably, the fast decay is associated with motion within the first shell of solvent neighbors and the slow decay with motion past these shells. For AR, a single-exponential decay is seen. The results indicate a breakdown of the Stokes-Einstein (SE) relationship. The relevant quantity that determines the validity of the SE relationship is the levitation parameter which is indirectly related to the solute/solvent radius ratio and not either the size of the solute or the solvent alone.
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Affiliation(s)
- Pradip Kr Ghorai
- Solid State and Structural Chemistry Unit and Center for Condensed Matter Theory, Indian Institute of Science, Bangalore 560012, India
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Aqueous-phase adsorption of aromatic compounds on water-soluble nanographite. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2004.11.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Asthalter T, Garibay JV, Olszowka V, Kornatowski J. Dynamics of ferrocene in AlPO4-5 single crystals probed by nuclear forward scattering. J Chem Phys 2005; 122:14508. [PMID: 15638675 DOI: 10.1063/1.1827214] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have investigated the dynamics of ferrocene in the channels of single crystals of AlPO(4)-5, using nuclear forward scattering. Around 150 K, rotational dynamics sets in, which is strongly anisotropic up to 235 K. Assuming planar rotation of the ferrocene molecules within the channels we obtained an activation energy of (8.2+/-1.0) kJ mol(-1). Between 235 K and room temperature, the rotation becomes isotropic.
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Affiliation(s)
- T Asthalter
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany.
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Kamegawa K, Nishikubo K, Kodama M, Adachi Y, Yoshida H. Dissolution-aggregation behavior of water-soluble nanographites and their adsorptive characteristics for 2-naphthol in aqueous solutions. J Colloid Interface Sci 2003; 268:58-62. [PMID: 14611772 DOI: 10.1016/j.jcis.2003.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Carbon black was severely oxidized by concentrated nitric acid at 373 K, and the oxidation product was fractionated by ultrafiltration into five groups of a few nanometer-sized water-soluble aromatic compounds, which we called water-soluble nanographites (WSNG1-5). Most WSNGs dissolve in neutral and alkaline 0.1 moldm(-3) NaCl solutions, but precipitate in acidic solutions. The pH values at which the WSNGs begin to precipitate decreased as the molecular size of the WSNGs was lowered. WSNG3, which possesses a moderate molecular size among the WSNGs, adsorbed more 2-naphthol from acidic solutions than from neutral solutions. The maximum uptake of 2-naphthol on WSNG3 at the saturated concentration was, however, independent of the pH, both resulting in 1.28 mmolg(-1). This quantity indicates that each WSNG3 molecule adsorbs one and one-half 2-naphthol molecules. The maximum uptake was much greater than that of the graphitized carbon black (BET surface area, 77 m(2)g(-1)) and was equal to that of Amberlite XAD-2 (334 m(2)g(-1)). An increase in the molecular size of the WSNGs enhanced the adsorbate-adsorbent interaction, but decreased the maximum uptake of 2-naphthol at the saturated concentration.
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Affiliation(s)
- Katsumi Kamegawa
- National Institute of Advanced Industrial Science and Technology (AIST) Kyushu, 807-1, Shuku, Tosu, Saga, 841-0052, Japan.
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Abstract
Molecular dynamics studies of n-pentane and isopentane in one-dimensional channels of AlPO(4)-5 and a carbon nanotube are reported. Variation of the structure and energetics in AlPO(4)-5 along the channel axis of isopentane is similar to what has been found for other rigid molecular systems. In n-pentane, these properties exhibit more frequent undulations along the channel due to flexibility. The end-to-end distance of n-pentane is a function of its position along the channel in AlPO(4)-5, suggesting that n-pentane has to alternately stretch in the narrow part and destretch or coil in the broader part of the channel. n-Pentane lies flat instead of upright on the inner surface of the carbon nanotube. Both of the species exhibit diffusive motion in AlPO(4)-5, and the self-diffusivity is higher than that in bulk. Isopentane has a higher diffusivity than does n-pentane. This is attributed to the higher cross section of isopentane, which is closer to the void cross section. Further, the coupling of the translational motion with the slower dihedral angle reorientation in the case of n-pentane decreases its mobility. Superdiffusive motion is seen for both species in the carbon nanotube. These results can be understood in terms of the levitation effect.
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Affiliation(s)
- Shreyas Y Bhide
- Solid State and Structural Chemistry Unit and Supercomputer Education and Research Centre, Indian Institute of Science, Bangalore-560012, India
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Bhide SY, Yashonath S. Study of Translational and Rotational Mobility and Orientational Preference of Ethane in One-Dimensional Channels. J Phys Chem A 2002. [DOI: 10.1021/jp020101e] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shreyas Y. Bhide
- Solid State and Structural Chemistry Unit and Supercomputer Education and Research Centre, Indian Institute of Science, Bangalore-560012, India
| | - S. Yashonath
- Solid State and Structural Chemistry Unit and Supercomputer Education and Research Centre, Indian Institute of Science, Bangalore-560012, India
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Bhide SY, Yashonath S. Orientational preference and influence of rotation on methane mobility in one-dimensional channels. J Chem Phys 2002. [DOI: 10.1063/1.1433464] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bhide SY, Kumar AVA, Yashonath S. Diffusion of hydrocarbons in confined media: Translational and rotational motion. J CHEM SCI 2001. [DOI: 10.1007/bf02708790] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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