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Cellulose nanofibril core-shell silica coatings and their conversion into thermally stable nanotube aerogels
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0003-2201-2806
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0002-7674-0262
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0002-0236-5420
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.
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2015 (Engelska)Ingår i: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, nr 30, s. 15745-15754Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A facile water-based one-pot reaction protocol for obtaining 20 nm thick uniform silica coatings on cellulose nanofibrils (CNFs) is herein presented for the first time. The fully covering silica shells result in the thermal stability of the CNFs improved by ca. 70 degrees C and 50 degrees C under nitrogen and oxygen atmospheres, respectively. Heating of the core-shell hybrid fibres to 400 degrees C results in complete degradation/removal of the CNF cores, and demonstrates an inexpensive route to large-scale preparation of silica nanotubes with the CNFs used as templates. The key to a uniform condensation of silica (from tetraethyl orthosilicate) to cellulose is a reaction medium that permits in situ nucleation and growth of the silica phase on the fibrils, while simultaneously matching the quantity of the condensed silica with the specific surface area of the CNFs. Most coatings were applied to bundles of 2-3 associated CNFs, which could be discerned from their negative imprint that remained inside the silica nanotubes. Finally, it is demonstrated that the coated nanofibrils can be freeze-dried into highly porous silica/cellulose aerogels with a density of 0.005 g cm(-3) and how these hybrid aerogels preserve their shape when extensively exposed to 400 degrees C in air (>6 h). The resulting material is the first reported silica nanotube aerogel obtained by using cellulose nanofibrils as templates.

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Royal Society of Chemistry, 2015. Vol. 3, nr 30, s. 15745-15754
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Kemi Energiteknik
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URN: urn:nbn:se:kth:diva-172186DOI: 10.1039/c5ta03646aISI: 000358211700048Scopus ID: 2-s2.0-84937468455OAI: oai:DiVA.org:kth-172186DiVA, id: diva2:846551
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QC 20150817

Tillgänglig från: 2015-08-17 Skapad: 2015-08-14 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Andersson, Richard L.

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Liu, DongmingWu, QiongAndersson, Richard L.Hedenqvist, Mikael S.Olsson, Richard T.
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Fiber- och polymerteknologiWallenberg Wood Science Center
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Journal of Materials Chemistry A
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