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Facile preparation of monolithic k-carrageenan aerogels

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

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Abstract

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.

Document Type:Article
Title:Facile preparation of monolithic k-carrageenan aerogels
Authors:
AuthorsInstitution or Email of Authors
Ganesan, KathirvelK.Ganesan@dlr.de
Ratke, Lorenzlorenz.ratke@dlr.de
Date:2014
Journal or Publication Title:Soft Matter
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI:10.1039/c3sm52862f
Page Range:pp. 3218-3224
ISSN:1744-683X
Status:Published
Keywords:Aerogel, carrageenan, surface area
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Integrative Studien
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Barbara Milow
Deposited On:10 Jul 2014 14:52
Last Modified:10 Jul 2014 14:52

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