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Gas Permeability of Cellulose Aerogels with a Designed Dual Pore Space System

Ganesan, Kathirvel and Barowski, Adam and Ratke, Lorenz (2019) Gas Permeability of Cellulose Aerogels with a Designed Dual Pore Space System. Molecules, 24 (15), p. 2688. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/molecules24152688 ISSN 1420-3049

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Official URL: https://www.mdpi.com/1420-3049/24/15/2688

Abstract

The gas permeability of a porous material is a key property determining the impact of the material in an application such as filter/separation techniques. In the present study, aerogels of cellulose scaffolds were designed with a dual pore space system consisting of macropores with cell walls composing of mesopores and a nanofibrillar network. The gas permeability properties of these dual porous materials were compared with classical cellulose aerogels. Emulsifying the oil droplets in the hot salt–hydrate melt with a fixed amount of cellulose was performed in the presence of surfactants. The surfactants varied in physical, chemical and structural properties and a range of hydrophilic–lipophilic balance (HLB) values, 13.5 to 18. A wide range of hierarchical dual pore space systems were produced and analysed using nitrogen adsorption–desorption analysis and scanning electron microscopy. The microstructures of the dual pore system of aerogels were quantitatively characterized using image analysis methods. The gas permeability was measured and discussed with respect to the well-known model of Carman–Kozeny for open porous materials. The gas permeability values implied that the kind of the macropore channel’s size, shape, their connectivity through the neck parts and the mesoporous structures on the cell walls are significantly controlling the flow resistance of air. Adaption of this new design route for cellulose-based aerogels can be suitable for advanced filters/membranes production and also biological or catalytic supporting materials since the emulsion template method allows the tailoring of the gas permeability while the nanopores of the cell walls can act simultaneously as absorbers.

Item URL in elib:https://elib.dlr.de/128760/
Document Type:Article
Title:Gas Permeability of Cellulose Aerogels with a Designed Dual Pore Space System
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ganesan, Kathirvelk.ganesan (at) dlr.dehttps://orcid.org/0000-0002-4876-5366
Barowski, Adamadam.barowski (at) dlr.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.dehttps://orcid.org/0000-0003-2487-4717
Date:24 July 2019
Journal or Publication Title:Molecules
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:24
DOI :10.3390/molecules24152688
Page Range:p. 2688
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1420-3049
Status:Published
Keywords:cellulose aerogel; dual pore system; gas permeability; surfactant; macropore; mesopore
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Fahrzeugstruktur II
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Ganesan, Dr. Kathirvel
Deposited On:06 Nov 2019 15:47
Last Modified:14 Dec 2019 04:25

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