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Flexible and fire-retardant silica/cellulose aerogel using bacterial cellulose nanofibrils as template material
Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.ORCID iD: 0000-0002-7674-0262
Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.ORCID iD: 0000-0002-2073-7005
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2024 (English)In: Materials Advances, E-ISSN 2633-5409Article in journal (Refereed) Epub ahead of print
Abstract [en]

This study explores the possibility of using various silsesquioxane precursors such as (3-aminopropyl) triethoxysilane (APTES), methyltrimethoxysilane (MTMS), and tetraethyl orthosilicate (TEOS) to produce silsesquioxane-bacterial cellulose nanofibre (bCNF) aerogels. Each precursor allowed to customize the aerogel properties, leading to unique properties suitable for various applications requiring lightweight insulative materials. When utilizing APTES as the silsesquioxane precursor, an aerogel capable of over 90% recovery after compression was formed, making them suitable for flexible applications. When MTMS was used as the precursor, the aerogel retained some compression recovery (80%) but had the added property of superhydrophobicity with a contact angle over 160° due to the presence of CH3 functional groups, enabling water-repellence. Finally, TEOS allowed for excellent thermal insulative properties with a low Peak Heat Release Rate (PHRR), making it a promising candidate for fire-resistant applications. The customization of these aerogel materials was attributed to a combination of the chemical composition of the silsesquioxane precursors and the morphology of the coated bacterial cellulose nanofibres (bCNF), such as CH3 groups found in MTMS enabled for superhydrophobicity. Differences in morphology, such as uniform and smooth silsesquioxane coatings when using APTES or a “pearl-necklace” morphology using TEOS, enabled either compression recovery and flexibility or low thermal conduction. This investigation of silsesquioxane-bCNF provides a good understanding of the importance of the choice of precursor effect on insulating aerogel properties.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2024.
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Materials Chemistry
Research subject
Structural Engineering
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URN: urn:nbn:se:ltu:diva-104509DOI: 10.1039/d3ma01090bScopus ID: 2-s2.0-85185472680OAI: oai:DiVA.org:ltu-104509DiVA, id: diva2:1843035
Note

Funder: Swedish Research Council (VR 2019-05650);

Full text license: CC BY

Available from: 2024-03-07 Created: 2024-03-07 Last updated: 2024-03-07

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Das, OisikMensah, Rhoda Afriyie

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