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Facile preparation of monolithic k-carrageenan aerogels

Ganesan, Kathirvel und Ratke, Lorenz (2014) Facile preparation of monolithic k-carrageenan aerogels. Soft Matter, 10, Seiten 3218-3224. DOI: 10.1039/c3sm52862f. ISSN 1744-683X.

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Kurzfassung

To the best of our knowledge, it is the first study reporting the synthesis of monolithic k-carrageenan aerogels with meso- and macroporous structures, being unique in physical and chemical properties. We demonstrate a novel method to synthesize k-carrageenan aerogels in which potassium thiocyanate was used as the source of specific ions. Aerogels were characterized by envelope density analysis, scanning electron microscopy, nitrogen adsorption–desorption analysis, X-ray powder diffractometry and IR spectroscopy. By varying the concentration of k-carrageenan between 0.5 and 3 wt%, the envelope density can be linearly increased from 40 to 160 kg m�3. The sulphate functional groups in the wet gel and the specific ions are the key factors controlling the volume shrinkage of aerogels which average about 66%. The aerogels exhibit a fibrillar structure similar to cellulose aerogels. The fibril thickness was observed to be 10–15 nm and the specific surface area was about 230 m2 g�1. The existing meso- and macroporous structures were confirmed by nitrogen adsorption–desorption isotherm analysis and scanning electron microscopy. The aerogels were completely pure, free of specific ions and confirmed to be amorphous by powder X-ray diffraction. Hence, these porous materials can provide a matrix with a chelating function which can be used as a host in many applications.

Dokumentart:Zeitschriftenbeitrag
Titel:Facile preparation of monolithic k-carrageenan aerogels
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ganesan, KathirvelK.Ganesan@dlr.de
Ratke, Lorenzlorenz.ratke@dlr.de
Datum:2014
Erschienen in:Soft Matter
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:10
DOI :10.1039/c3sm52862f
Seitenbereich:Seiten 3218-3224
ISSN:1744-683X
Status:veröffentlicht
Stichwörter:Aerogel, carrageenan, surface area
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Integrative Studien
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele
Hinterlegt von: Barbara Milow
Hinterlegt am:10 Jul 2014 14:52
Letzte Änderung:28 Sep 2015 10:05

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