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The effect of zinc oxide (ZnO) addition on the physical and morphological properties of cellulose aerogel beads

Kamal Mohamed, Seeni Meera and Ganesan, Kathirvel and Milow, Barbara and Ratke, Lorenz (2015) The effect of zinc oxide (ZnO) addition on the physical and morphological properties of cellulose aerogel beads. RSC Advances, 5 (109), pp. 90193-90201. Royal Society of Chemistry. DOI: 10.1039/C5RA17366C ISSN 2046-2069

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Official URL: http://dx.doi.org/10.1039/C5RA17366C

Abstract

Microsized open porous beads of cellulose were made using the dissolution medium containing mixtures of 7 wt% NaOH and 12 wt% urea and additionally various concentrations of ZnO to study its effect on physical and morphological properties of the cellulose beads formed. It has been observed that such cellulose aerogel beads prepared with lower concentrations of ZnO show shrinkage while drying whereas beads prepared with higher concentrations of ZnO do not exhibit much shrinkage. The dried cellulose aerogel beads were spherical with diameters between 2-2.5 mm. The skeletal density of all dried cellulose beads was measured as 1.5 g/cm3. FT-IR spectra reveal that the structure of cellulose I transformed to cellulose II during dissolution and regeneration in a coagulation medium, which also confirmed from XRD measurements. The beads prepared with NaOH/urea/ZnO aqueous solution exhibit better thermal stability. We found that the addition of 0.5 wt% ZnO to NaOH/urea mixture greatly increased the specific surface area of cellulose beads up to 407 m2/g compared to control cellulose beads (341 m2/g). SEM images indicate that a dense nano-fibrillar network structure was formed in the interior of the cellulose aerogel beads prepared with 0.5 wt% ZnO.

Item URL in elib:https://elib.dlr.de/99264/
Document Type:Article
Title:The effect of zinc oxide (ZnO) addition on the physical and morphological properties of cellulose aerogel beads
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kamal Mohamed, Seeni Meerakamalmohamed.seenimeera (at) dlr.deUNSPECIFIED
Ganesan, KathirvelK.Ganesan (at) dlr.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.deUNSPECIFIED
Ratke, LorenzLorenz.Ratke (at) dlr.deUNSPECIFIED
Date:15 October 2015
Journal or Publication Title:RSC Advances
Refereed publication:No
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:5
DOI :10.1039/C5RA17366C
Page Range:pp. 90193-90201
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Status:Published
Keywords:Cellulose; Microbeads; NaOH/urea;, ZnO; Specific surface area
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Air Transport Concepts and Operation (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogele
Deposited By: Kamal Mohamed, Dr. Seeni Meera
Deposited On:09 Nov 2015 14:53
Last Modified:10 Jan 2019 15:54

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