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Reichmann J, Sarrazin C, Schmale S, Blaurock C, Balkema-Buschmann A, Schmitzer B, Salditt T. 3D imaging of SARS-CoV-2 infected hamster lungs by X-ray phase contrast tomography enables drug testing. Sci Rep 2024; 14:12348. [PMID: 38811688 PMCID: PMC11137149 DOI: 10.1038/s41598-024-61746-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 05/09/2024] [Indexed: 05/31/2024] Open
Abstract
X-ray Phase Contrast Tomography (XPCT) based on wavefield propagation has been established as a high resolution three-dimensional (3D) imaging modality, suitable to reconstruct the intricate structure of soft tissues, and the corresponding pathological alterations. However, for biomedical research, more is needed than 3D visualisation and rendering of the cytoarchitecture in a few selected cases. First, the throughput needs to be increased to cover a statistically relevant number of samples. Second, the cytoarchitecture has to be quantified in terms of morphometric parameters, independent of visual impression. Third, dimensionality reduction and classification are required for identification of effects and interpretation of results. To address these challenges, we here design and implement a novel integrated and high throughput XPCT imaging and analysis workflow for 3D histology, pathohistology and drug testing. Our approach uses semi-automated data acquisition, reconstruction and statistical quantification. We demonstrate its capability for the example of lung pathohistology in Covid-19. Using a small animal model, different Covid-19 drug candidates are administered after infection and tested in view of restoration of the physiological cytoarchitecture, specifically the alveolar morphology. To this end, we then use morphometric parameter determination followed by a dimensionality reduction and classification based on optimal transport. This approach allows efficient discrimination between physiological and pathological lung structure, thereby providing quantitative insights into the pathological progression and partial recovery due to drug treatment. Finally, we stress that the XPCT image chain implemented here only used synchrotron radiation for validation, while the data used for analysis was recorded with laboratory μ CT radiation, more easily accessible for pre-clinical research.
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Affiliation(s)
- Jakob Reichmann
- Georg-August-University of Göttingen, Institute for X-Ray Physics, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
| | - Clement Sarrazin
- Georg-August-University of Göttingen, Institute of Computer Science, Goldschmidtstraße 7, 37077, Göttingen, Germany
- Equipe RAPSODI, Centre INRIA de l'université de Lille, F-59000, Lille, France
| | - Sebastian Schmale
- Georg-August-University of Göttingen, Institute of Computer Science, Goldschmidtstraße 7, 37077, Göttingen, Germany
| | - Claudia Blaurock
- Friedrich-Loeffler-Institute, Südufer 10, 17493, Greifswald, Insel Riems, Germany
| | | | - Bernhard Schmitzer
- Georg-August-University of Göttingen, Institute of Computer Science, Goldschmidtstraße 7, 37077, Göttingen, Germany.
| | - Tim Salditt
- Georg-August-University of Göttingen, Institute for X-Ray Physics, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany.
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Wittstock G, Bäumer M, Dononelli W, Klüner T, Lührs L, Mahr C, Moskaleva LV, Oezaslan M, Risse T, Rosenauer A, Staubitz A, Weissmüller J, Wittstock A. Nanoporous Gold: From Structure Evolution to Functional Properties in Catalysis and Electrochemistry. Chem Rev 2023; 123:6716-6792. [PMID: 37133401 DOI: 10.1021/acs.chemrev.2c00751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Nanoporous gold (NPG) is characterized by a bicontinuous network of nanometer-sized metallic struts and interconnected pores formed spontaneously by oxidative dissolution of the less noble element from gold alloys. The resulting material exhibits decent catalytic activity for low-temperature, aerobic total as well as partial oxidation reactions, the oxidative coupling of methanol to methyl formate being the prototypical example. This review not only provides a critical discussion of ways to tune the morphology and composition of this material and its implication for catalysis and electrocatalysis, but will also exemplarily review the current mechanistic understanding of the partial oxidation of methanol using information from quantum chemical studies, model studies on single-crystal surfaces, gas phase catalysis, aerobic liquid phase oxidation, and electrocatalysis. In this respect, a particular focus will be on mechanistic aspects not well understood, yet. Apart from the mechanistic aspects of catalysis, best practice examples with respect to material preparation and characterization will be discussed. These can improve the reproducibility of the materials property such as the catalytic activity and selectivity as well as the scope of reactions being identified as the main challenges for a broader application of NPG in target-oriented organic synthesis.
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Affiliation(s)
- Gunther Wittstock
- Carl von Ossietzky University of Oldenburg, School of Mathematics and Science, Institute of Chemistry, D-26111 Oldenburg, Germany
| | - Marcus Bäumer
- University of Bremen, Institute for Applied and Physical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
| | - Wilke Dononelli
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Bremen Center for Computational Materials Science, Hybrid Materials Interfaces Group, Am Fallturm 1, Bremen 28359, Germany
| | - Thorsten Klüner
- Carl von Ossietzky University of Oldenburg, School of Mathematics and Science, Institute of Chemistry, D-26111 Oldenburg, Germany
| | - Lukas Lührs
- Hamburg University of Technology, Institute of Materials Physics and Technology, 21703 Hamburg, Germany
| | - Christoph Mahr
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Institute of Solid State Physics, Otto Hahn Allee 1, 28359 Bremen, Germany
| | - Lyudmila V Moskaleva
- University of the Free State, Department of Chemistry, P.O. Box 339, Bloemfontein 9300, South Africa
| | - Mehtap Oezaslan
- Technical University of Braunschweig Institute of Technical Chemistry, Technical Electrocatalysis Laboratory, Franz-Liszt-Strasse 35a, 38106 Braunschweig, Germany
| | - Thomas Risse
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Arnimallee 22, 14195 Berlin, Germany
| | - Andreas Rosenauer
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Institute of Solid State Physics, Otto Hahn Allee 1, 28359 Bremen, Germany
| | - Anne Staubitz
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Institute for Organic and Analytical Chemistry, Leobener Strasse 7, D-28359 Bremen, Germany
| | - Jörg Weissmüller
- Hamburg University of Technology, Institute of Materials Physics and Technology, 21703 Hamburg, Germany
- Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht, Germany
| | - Arne Wittstock
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Institute for Organic and Analytical Chemistry, Leobener Strasse 7, D-28359 Bremen, Germany
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3
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Zheng J, Chen J, Jin Y, Wen Y, Mu Y, Wu C, Wang Y, Tong P, Li Z, Hou X, Tang J. Photochromism from wavelength-selective colloidal phase segregation. Nature 2023; 617:499-506. [PMID: 37198311 PMCID: PMC10191859 DOI: 10.1038/s41586-023-05873-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 02/21/2023] [Indexed: 05/19/2023]
Abstract
Phase segregation is ubiquitously observed in immiscible mixtures, such as oil and water, in which the mixing entropy is overcome by the segregation enthalpy1-3. In monodispersed colloidal systems, however, the colloidal-colloidal interactions are usually non-specific and short-ranged, which leads to negligible segregation enthalpy4. The recently developed photoactive colloidal particles show long-range phoretic interactions, which can be readily tuned with incident light, suggesting an ideal model for studying phase behaviour and structure evolution kinetics5,6. In this work, we design a simple spectral selective active colloidal system, in which TiO2 colloidal species were coded with spectral distinctive dyes to form a photochromic colloidal swarm. In this system, the particle-particle interactions can be programmed by combining incident light with various wavelengths and intensities to enable controllable colloidal gelation and segregation. Furthermore, by mixing the cyan, magenta and yellow colloids, a dynamic photochromic colloidal swarm is formulated. On illumination of coloured light, the colloidal swarm adapts the appearance of incident light due to layered phase segregation, presenting a facile approach towards coloured electronic paper and self-powered optical camouflage.
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Affiliation(s)
- Jing Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Jingyuan Chen
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Yakang Jin
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
- School of Physics, University of Electronic Science and Technology of China, Chengdu, China
| | - Yan Wen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Yijiang Mu
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Changjin Wu
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Yufeng Wang
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Penger Tong
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Zhigang Li
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Xu Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
- Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Jiujiang Research Institute, College of Physical Science and Technology, Xiamen University, Xiamen, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, China
| | - Jinyao Tang
- Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China.
- State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, China.
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Constitutive formulations for non-colloidal suspensions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bagherian A, Famouri S, Baghani M, George D, Sheidaei A, Baniassadi M. A New Statistical Descriptor for the Physical Characterization and 3D Reconstruction of Heterogeneous Materials. Transp Porous Media 2021. [DOI: 10.1007/s11242-021-01660-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Mahr C, Dworzak A, Schowalter M, Oezaslan M, Rosenauer A. Quantitative 3D Characterization of Nanoporous Gold Nanoparticles by Transmission Electron Microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2021; 27:678-686. [PMID: 34085625 DOI: 10.1017/s1431927621000519] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Quantitative structural characterization of nanomaterials is important to tailor their functional properties. Corrosion of AgAu-alloy nanoparticles (NPs) results in porous structures, making them interesting for applications especially in the fields of catalysis and surface-enhanced Raman spectroscopy. For the present report, structures of dealloyed NPs were reconstructed three-dimensionally using scanning transmission electron microscopy tomography. These reconstructions were evaluated quantitatively, revealing structural information such as pore size, porosity, specific surface area, and tortuosity. Results show significant differences compared to the structure of dealloyed bulk samples and can be used as input for simulations of diffusion or mass transport processes, for example, in catalytic applications.
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Affiliation(s)
- Christoph Mahr
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359Bremen, Germany
- MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, 28359Bremen, Germany
| | - Alexandra Dworzak
- Technical Electrocatalysis Laboratory, Institute of Technical Chemistry, Technical University of Braunschweig, Franz-Liszt-Str. 35a, 38106Braunschweig, Germany
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129Oldenburg, Germany
| | - Marco Schowalter
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359Bremen, Germany
- MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, 28359Bremen, Germany
| | - Mehtap Oezaslan
- Technical Electrocatalysis Laboratory, Institute of Technical Chemistry, Technical University of Braunschweig, Franz-Liszt-Str. 35a, 38106Braunschweig, Germany
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129Oldenburg, Germany
| | - Andreas Rosenauer
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359Bremen, Germany
- MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, 28359Bremen, Germany
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Abstract
AbstractNanoporous solids are ubiquitous in chemical, energy, and environmental processes, where controlled transport of molecules through the pores plays a crucial role. They are used as sorbents, chromatographic or membrane materials for separations, and as catalysts and catalyst supports. Defined as materials where confinement effects lead to substantial deviations from bulk diffusion, nanoporous materials include crystalline microporous zeotypes and metal–organic frameworks (MOFs), and a number of semi-crystalline and amorphous mesoporous solids, as well as hierarchically structured materials, containing both nanopores and wider meso- or macropores to facilitate transport over macroscopic distances. The ranges of pore sizes, shapes, and topologies spanned by these materials represent a considerable challenge for predicting molecular diffusivities, but fundamental understanding also provides an opportunity to guide the design of new nanoporous materials to increase the performance of transport limited processes. Remarkable progress in synthesis increasingly allows these designs to be put into practice. Molecular simulation techniques have been used in conjunction with experimental measurements to examine in detail the fundamental diffusion processes within nanoporous solids, to provide insight into the free energy landscape navigated by adsorbates, and to better understand nano-confinement effects. Pore network models, discrete particle models and synthesis-mimicking atomistic models allow to tackle diffusion in mesoporous and hierarchically structured porous materials, where multiscale approaches benefit from ever cheaper parallel computing and higher resolution imaging. Here, we discuss synergistic combinations of simulation and experiment to showcase theoretical progress and computational techniques that have been successful in predicting guest diffusion and providing insights. We also outline where new fundamental developments and experimental techniques are needed to enable more accurate predictions for complex systems.
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8
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Jin W, van Ommen JR, Kleijn CR. Moving reaction fronts in fractal nanoparticle agglomerates. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.05.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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Evolution of sorptive and textural properties of CaO-based sorbents during repetitive sorption/regeneration cycles: Part II. Modeling of sorbent sintering during initial cycles. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.12.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Yoshimoto Y, Hori T, Kinefuchi I, Takagi S. Effect of capillary condensation on gas transport properties in porous media. Phys Rev E 2018; 96:043112. [PMID: 29347560 DOI: 10.1103/physreve.96.043112] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Indexed: 11/07/2022]
Abstract
We investigate the effect of capillary condensation on gas diffusivity in porous media composed of randomly packed spheres with moderate wettability. To simulate capillary phenomena at the pore scale while retaining complex pore networks of the porous media, we employ density functional theory (DFT) for coarse-grained lattice gas models. The lattice DFT simulations reveal that capillary condensations preferentially occur at confined pores surrounded by solid walls, leading to the occlusion of narrow pores. Consequently, the characteristic lengths of the partially wet structures are larger than those of the corresponding dry structures with the same porosities. Subsequent gas diffusion simulations exploiting the mean-square displacement method indicate that while the effective diffusion coefficients significantly decrease in the presence of partially condensed liquids, they are larger than those in the dry structures with the same porosities. Moreover, we find that the ratio of the porosity to the tortuosity factor, which is a crucial parameter that determines an effective diffusion coefficient, can be reasonably related to the porosity even for the partially wet porous media.
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Affiliation(s)
- Yuta Yoshimoto
- Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takuma Hori
- Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ikuya Kinefuchi
- Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shu Takagi
- Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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11
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MacIver MR, Pawlik M. Analysis of In Situ Microscopy Images of Flocculated Sediment Volumes. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600523] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Michael R. MacIver
- The University of British Columbia; Norman B. Keevil Institute of Mining Engineering; 517-6350 Stores Road V6T 1Z4 Vancouver, BC Canada
| | - Marek Pawlik
- The University of British Columbia; Norman B. Keevil Institute of Mining Engineering; 517-6350 Stores Road V6T 1Z4 Vancouver, BC Canada
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12
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Bazaikin Y, Malkovich E, Derevschikov V, Lysikov A, Okunev A. Evolution of sorptive and textural properties of CaO-based sorbents during repetitive sorption/regeneration cycles. Chem Eng Sci 2016. [DOI: 10.1016/j.ces.2016.06.064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Derossi A, Severini C, Ricci I. On the inverse problem of the reconstruction of food microstructure from limited statistical information. A study on bread. J FOOD ENG 2016. [DOI: 10.1016/j.jfoodeng.2016.03.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Bälz G, Feuchter C, Handel R, Renz B. Filter Media Pore Space Analysis Based on Geometrical Characteristics. Chem Eng Technol 2016. [DOI: 10.1002/ceat.201500348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Derossi A, Severini C, De Pilli T. Measuring the food microstructure by two-point cluster function. J FOOD ENG 2016. [DOI: 10.1016/j.jfoodeng.2015.10.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Naseri A, Peppley BA, Pharoah JG, Mandal P, Litster S, Abatzoglou N. X-ray tomography-based analysis of transport and reaction in the catalyst coating of a reformer. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2015.08.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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17
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Huang C, Yu W. Role of block copolymer on the coarsening of morphology in polymer blend: Effect of micelles. AIChE J 2014. [DOI: 10.1002/aic.14633] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chongwen Huang
- Dept. of Polymer Science and Engineering; Advanced Rheology Institute, Shanghai Jiao Tong University; Shanghai 200240 P.R. China
| | - Wei Yu
- Dept. of Polymer Science and Engineering; Advanced Rheology Institute, Shanghai Jiao Tong University; Shanghai 200240 P.R. China
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18
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Bertei A, Nucci B, Nicolella C. Microstructural modeling for prediction of transport properties and electrochemical performance in SOFC composite electrodes. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.06.032] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Derossi A, De Pilli T, Severini C. Statistical Description of Food Microstructure. Extraction of Some Correlation Functions From 2D Images. FOOD BIOPHYS 2013. [DOI: 10.1007/s11483-013-9307-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Derossi A, De Pilli T, Severini C. Use of Lineal-Path Distribution Function as Statistical Descriptor of the Crumb Structure of Bread. FOOD BIOPHYS 2013. [DOI: 10.1007/s11483-013-9289-0] [Citation(s) in RCA: 7] [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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21
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Derossi A, De Pilli T, Severini C. Statistical Description of Fat and Meat Phases of Sausages by the Use of Lineal-Path Distribution Function. FOOD BIOPHYS 2012. [DOI: 10.1007/s11483-012-9264-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Berson A, Choi HW, Pharoah JG. Determination of the effective gas diffusivity of a porous composite medium from the three-dimensional reconstruction of its microstructure. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 83:026310. [PMID: 21405909 DOI: 10.1103/physreve.83.026310] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 10/31/2010] [Indexed: 05/30/2023]
Abstract
The present work describes a procedure to calculate the effective diffusivity of a porous composite medium from the three-dimensional reconstruction of its microstructure. We perform Monte Carlo simulations based on the mean-square displacement method on numerical models of composite materials microstructures. First, computations of the effective diffusivity in the bulk diffusion regime account for the effect of the tortuosity of the geometry on gas diffusion. The Bruggeman equation, which is often used in the literature to relate the effective diffusivity to the porosity of the structure, appears to be inaccurate for porosities ε<0.40. A more accurate correlation for this range of porosities is provided based on the results of our simulations. Second, the Bosanquet equation, which accounts for the effect of pore confinement on gas diffusion, is validated provided that the definition of the Knudsen number is based on the appropriate characteristic length. The procedure to calculate this characteristic length is demonstrated for analytical geometries. However, in practice, geometries obtained from experimental measurements are discrete. For discrete geometries, we show the effect of the resolution of the geometry on the accuracy of the calculation of the effective diffusivity and other properties of the porous material. In addition, the tesselation of solid surfaces affects the calculation of the chord-length distribution regardless of the resolution. This hinders the accurate estimation of the characteristic length necessary to compute the Knudsen number and the effective diffusivity.
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Affiliation(s)
- Arganthaël Berson
- Queen's-RMC Fuel Cell Research Centre, Queen's University, 945 Princess Street, Kingston, Ontario, K7L 5L9, Canada
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23
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A method for the determination of accessible surface area, pore volume, pore size and its volume distribution for homogeneous pores of different shapes. ADSORPTION 2011. [DOI: 10.1007/s10450-010-9314-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Affiliation(s)
- MARTIN WHITTLE
- a Procter Department of Food Science , University of Leeds , Leeds , LS2 9JT , UK
| | - ERIC DICKINSON
- a Procter Department of Food Science , University of Leeds , Leeds , LS2 9JT , UK
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25
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Adib AB. Random-walk approach to the d-dimensional disordered Lorentz gas. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:021118. [PMID: 18351998 DOI: 10.1103/physreve.77.021118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Revised: 12/06/2007] [Indexed: 05/26/2023]
Abstract
A correlated random walk approach to diffusion is applied to the disordered nonoverlapping Lorentz gas. By invoking the Lu-Torquato theory for chord-length distributions in random media [J. Chem. Phys. 98, 6472 (1993)], an analytic expression for the diffusion constant in arbitrary number of dimensions d is obtained. The result corresponds to an Enskog-like correction to the Boltzmann prediction, being exact in the dilute limit, and better or nearly exact in comparison to renormalized kinetic theory predictions for all allowed densities in d=2,3 . Extensive numerical simulations were also performed to elucidate the role of the approximations involved.
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Affiliation(s)
- Artur B Adib
- Laboratory of Chemical Physics, NIDDK, NIH, Bethesda, MD 20892-0520, USA.
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26
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Hilfer R. Transport and Relaxation Phenomena in Porous Media. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141519.ch3] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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27
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Hu GH, Li H, Feng LF. A theoretical model for quiescent coarsening in immiscible polymer blends. AIChE J 2006. [DOI: 10.1002/aic.690481121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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The effects of diffusion mechanism and void structure on transport rates and tortuosity factors in complex porous structures. Chem Eng Sci 2004. [DOI: 10.1016/j.ces.2004.04.028] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hütter M. Heterogeneity of colloidal particle networks analyzed by means of Minkowski functionals. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 68:031404. [PMID: 14524766 DOI: 10.1103/physreve.68.031404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2002] [Revised: 06/30/2003] [Indexed: 05/24/2023]
Abstract
The heterogeneity and large scale connectivity of colloidal particle networks, which are generated by Brownian dynamics simulations, is examined. This is achieved by employing integral geometric measures in the form of the Minkowski functionals or quermassintegrals. It is found that these measures in conjunction with the parallel-body technique amount to a powerful tool to characterize the structure, going beyond the information contained in the pair-correlation function. The development of heterogeneities during network formation as well as their dependence on the volume fraction and the interaction potential is studied. In particular, it is found that slow coagulation enhances the heterogeneity of the network compared to fast coagulation.
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Affiliation(s)
- Markus Hütter
- ETH-Zurich, Department of Materials, Institute of Polymers, CH-8092 Zurich, Switzerland.
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Yu W, Zhou C, Inoue T. A coalescence mechanism for the coarsening behavior of polymer blends during a quiescent annealing process. II. Polydispersed particle system. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/1099-0488(20000915)38:18<2390::aid-polb60>3.0.co;2-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Torquato S, Lu B. Chord-length distribution function for two-phase random media. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 47:2950-2953. [PMID: 9960331 DOI: 10.1103/physreve.47.2950] [Citation(s) in RCA: 159] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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