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Hierarchical porous structures and properties of cellulose aerogels

Ganesan, Kathirvel und Ratke, Lorenz und Barowski, Adam (2016) Hierarchical porous structures and properties of cellulose aerogels. CellMat 2016, 2016-12-07 - 2016-12-09, Dresden, Deutschland.

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Kurzfassung

Cellulose-based biocomposites from nature exhibit remarkable mechanical properties which inspire to prepare synthetic biocomposites. The detailed studies of the porous cellulose materials having hierarchical structures are essential to understand how the cellulose nanofiber network and interconnected macro- and mesoporous structures exclusively influence the mechanical properties. We designed the hierarchical open porous structures of cellulose aerogels by a novel method in which an intricate trap of oil droplets in the cellulose-dissolved molten salt hydrate acts as a structural template assisting the formation of interconnected macroporous structures. After washing, the wet alcogels of cellulose were employed in super critical drying technique to prepare aerogels. We have employed the surfactants with different hydrophilic-lipophilic balance (HLB) values in order to vary the hierarchical structures. The diversity in physical properties of the cellulose aerogels were characterized by X-ray μ-computed tomography, density analyzer, scanning electron microscopy, nitrogen adsorption–desorption analysis, X-ray powder diffraction, FTIR spectroscopy, mechanical testing and gas permeability. In the resulting products, the variations in physical properties were the size of the macropores produced by the emulsion template, the change in surface features of the cell walls and the presence of nanopores in the cell walls. The mechanical properties of hierarchically porous cellulose materials were diverged from lightweight soft materials to hard, stiff and dense material if the drying technique was changed to freeze drying or ambient drying. This new method opens design routes for cellulose-based materials suitable for applications in new type of filters, since the emulsion template method allows tailoring the gas permeability and the nanopores of the cell walls act as absorbers.

elib-URL des Eintrags:https://elib.dlr.de/109610/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Hierarchical porous structures and properties of cellulose aerogels
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Ganesan, Kathirvelk.ganesan (at) dlr.dehttps://orcid.org/0000-0002-4876-5366NICHT SPEZIFIZIERT
Ratke, Lorenzlorenz.ratke (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Barowski, Adamadam.barowski (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Dezember 2016
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Cellulose; Aerogel; Macroporous; Mesoporous; Scaffold; Supercritical drying.
Veranstaltungstitel:CellMat 2016
Veranstaltungsort:Dresden, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:7 Dezember 2016
Veranstaltungsende:9 Dezember 2016
Veranstalter :DGM
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC Fahrzeugstruktur (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele
Hinterlegt von: Ganesan, Dr. Kathirvel
Hinterlegt am:16 Feb 2017 07:04
Letzte Änderung:24 Apr 2024 20:14

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