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Pore size effects o...
Pore size effects on convective flow and diffusion through nanoporous silica gels
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- Hamngren Blomqvist, Charlotte, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden
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- Abrahamsson, Christoffer, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden
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- Gebäck, Tobias, 1977 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för matematiska vetenskaper, matematik,Department of Mathematical Sciences, Mathematics,Chalmers tekniska högskola,Chalmers University of Technology,University of Gothenburg,Chalmers University of Technology, Sweden
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- Altskär, Annika (author)
- RISE,Structure Design,Chalmers University of Technology, Sweden
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- Hermansson, Anne-Marie, 1945 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden
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- Nydén, Magnus, 1970 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,University of South Australia,Chalmers University of Technology, Sweden; University of South Australia, Australia
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- Gustafsson, Stefan, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden
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- Lorén, Niklas, 1970 (author)
- RISE,Structure Design,Chalmers University of Technology, Sweden
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- Olsson, Eva, 1960 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden
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(creator_code:org_t)
- Elsevier BV, 2015
- 2015
- English.
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In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. - : Elsevier BV. - 0927-7757 .- 1873-4359. ; 484, s. 288-296
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Abstract
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- Material structure has great impact on mass transport properties, a relationship that needs to be understood on several length scales. Describing and controlling the properties of flow through soft materials are both challenges concerning the industrial use of gel structures. This paper reports on how the porous structure in nanoporous materials affects the water transport through them. We used three different silica gels with large differences in the pore sizes but of equal silica concentration. Particle morphology and gel structure were studied using high-resolution transmission electron microscopy and image analysis to estimate the pore size distribution and intrinsic surface area of each gel. The mass transport was studied using a flow measurement setup and nuclear magnetic resonance diffusometry. The average pore size ranged from approximately 500. nm down to approximately 40. nm. An acknowledged limit for convective flow to occur is in the pore size range between 100 and 200. nm. The results verified the existence of a non-linear relationship between pore size and liquid flow at length scales below 500. nm, experimentally. A factor of 4.3 in flow speed separated the coarser gel from the other two, which presented almost identical flow speed data despite a factor 3 in pore size difference. In the setup, the mass transport in the gel with the largest pores was flow dominated, while the mass transport in the finer gels was diffusion dominated. Besides providing new insights into mass transport as a function of pore sizes, we conclude that three-dimensional analysis of the structures is needed for a comprehensive understanding of the correlation between structure and mass transport properties.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Liquid permeability
- Mass transport
- Model material
- Nanoporous
- Silica gel
- Model material
Publication and Content Type
- ref (subject category)
- art (subject category)
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Hamngren Blomqvi ...
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Abrahamsson, Chr ...
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Gebäck, Tobias, ...
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Altskär, Annika
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Hermansson, Anne ...
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Nydén, Magnus, 1 ...
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Gustafsson, Stef ...
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Lorén, Niklas, 1 ...
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Olsson, Eva, 196 ...
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- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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and Other Materials ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Colloids and Sur ...
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University of Gothenburg
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Chalmers University of Technology
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RISE