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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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.
|Title:||Facile preparation of monolithic k-carrageenan aerogels|
|Journal or Publication Title:||Soft Matter|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 3218-3224|
|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|
|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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