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A novel approach to predict the skin layer porosity of porous asymmetric membranes via gas permeation test. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2020.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mirbagheri M, Akbari A, Hill RJ. A compact formula for the effective diffusivity of two-dimensional, anisotropic porous media with surface diffusion and interacting phases. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.09.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mirbagheri M, Hill RJ. Sorption and diffusion of moisture in silica-polyacrylamide nanocomposite films. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.04.071] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kulasinski K. Free Energy Landscape of Cellulose as a Driving Factor in the Mobility of Adsorbed Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5362-5370. [PMID: 28510442 DOI: 10.1021/acs.langmuir.7b00914] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The diffusion coefficient of water adsorbed in hydrophilic porous materials, such as noncrystalline cellulose, depends on water activity. Faster diffusion at higher water concentrations is observed in experimental and modeling studies. In this paper, two asymptotic water concentrations, near-vacuum and fully saturated, are investigated at the surface of crystalline cellulose with molecular dynamics simulations. An increasing water concentration leads to significant changes in the free energy landscape due to perturbation of local electrostatic potential. Smoothening of strong energy minima, corresponding to sorption sites, and formation of layered structure facilitates water transport in the vicinity of cellulose. The determined transition probabilities and hydrogen bond stability reflect the changes in the energy landscape. As a result of a concentration increase, the emerging basins of attraction and spreading out of those existing in the diluted state lead to an increase in water entropy. Thermal fluctuations of cellulose are demonstrated to rearrange the landscape in the diluted limit, increase adsorbed water entropy, and decrease the water-cellulose H-bond lifetime.
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Affiliation(s)
- Karol Kulasinski
- Department of Geochemistry, Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory , Berkeley, California, 94720, United States
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Mirbagheri M, Hill RJ. Diffusion in Randomly Overlapping Parallel Pore and Fiber Networks: How Pore Geometry and Surface Mobility Impact Membrane Selectivity. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b00573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marziye Mirbagheri
- Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
| | - Reghan J. Hill
- Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
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Bartling S, Pohl MM, Meiwes-Broer KH, Barke I. Morphological impact on the reaction kinetics of size-selected cobalt oxide nanoparticles. J Chem Phys 2015; 143:114301. [DOI: 10.1063/1.4930853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
- Stephan Bartling
- Department of Physics, University of Rostock, Universitätsplatz 3, D-18051 Rostock, Germany
| | - Marga-Martina Pohl
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT), Albert-Einstein-Str. 29a, D-18059 Rostock, Germany
| | | | - Ingo Barke
- Department of Physics, University of Rostock, Universitätsplatz 3, D-18051 Rostock, Germany
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Boţan A, Ulm FJ, Pellenq RJM, Coasne B. Bottom-up model of adsorption and transport in multiscale porous media. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:032133. [PMID: 25871080 DOI: 10.1103/physreve.91.032133] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Indexed: 06/04/2023]
Abstract
We develop a model of transport in multiscale porous media which accounts for adsorption in the different porosity scales. This model employs statistical mechanics to upscale molecular simulation and describe adsorption and transport at larger time and length scales. Using atom-scale simulations, which capture the changes in adsorption and transport with temperature, pressure, pore size, etc., this approach does not assume any adsorption or flow type. Moreover, by relating the local chemical potential μ(r) and density ρ(r), the present model accounts for adsorption effects and possible changes in the confined fluid state upon transport. This model constitutes a bottom-up framework of adsorption and transport in multiscale materials as it (1) describes the adsorption-transport interplay, (2) accounts for the hydrodynamics breakdown at the nm scale, and (3) is multiscale.
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Affiliation(s)
- Alexandru Boţan
- MultiScale Materials Science for Energy and Environment, UMI 3466 CNRS-MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Franz-Josef Ulm
- MultiScale Materials Science for Energy and Environment, UMI 3466 CNRS-MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Roland J-M Pellenq
- MultiScale Materials Science for Energy and Environment, UMI 3466 CNRS-MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Benoit Coasne
- MultiScale Materials Science for Energy and Environment, UMI 3466 CNRS-MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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