| Title: | Freeze-casting of highly porous cellulose-nanofiber-reinforced γ-Al2O3 monoliths |
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| Authors: | ID Hudelja, Hermina (Author)
ID Konegger, Thomas (Author)
ID Wicklein, Bernd (Author)
ID Čretnik, Janko (Author)
ID Akhtar, Farid (Author)
ID Kocjan, Andraž (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S2666539521000158?via%3Dihub
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | Freeze-casting is a powerful consolidation technique for the fabrication of highly porous and layered-hybrid materials, including ceramic-metal composites, and porous scaffolds for catalysis, bone substitutes and high- performance membranes. The aqueous suspensions to be freeze-casted usually contain dense particles facilitating macroporous, layered ceramics with dense (nonporous) struts. In the present study, hierarchical macro-mesoporous alumina (HMMA) monoliths were successfully prepared by freeze-casting of aqueous suspensions containing hierarchically-assembled, mesoporous γ‒Al2O3 (MA) powder and cellulose nanofibers (CNF). As- prepared monoliths were ultra-porous (93.1–99.2%), had low densities (0.01–0.25 g/cm3), and displayed relatively high surface areas (91–134 m2/g), but were still remarkably rigid with high compressive strengths (up to 52 kPa). Owing to the columnar porosity and mesoporous nature of the struts the freeze-casted HMMA monoliths exhibited high permeability and high thermal insulation, the latter ranging from 0.039 W/m∙K to 0.071 W/m∙K, depending on pore orientation. |
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| Keywords: | cellulose nanofiber, freeze-casting, gamma alumina, hierarchical porosity, insulative materials |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 11.02.2021 |
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| Publisher: | Elsevier Ltd |
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| Year of publishing: | 2021 |
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| Number of pages: | str. 1-10 |
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| Numbering: | Vol. 5 |
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| PID: | 20.500.12556/DiRROS-15855  |
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| UDC: | 620.3 |
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| ISSN on article: | 2666-5395 |
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| DOI: | 10.1016/j.oceram.2021.100069 |
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| COBISS.SI-ID: | 51386371 |
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| Copyright: | © 2021 The Author(s). Published by Elsevier Ltd on behalf of European Ceramic Society. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 12. 2. 2021;
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| Publication date in DiRROS: | 09.05.2023 |
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| Views: | 641 |
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| Downloads: | 508 |
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