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Microstructural and mechanical properties of cellulose aerogels

Aney, Shivangi and Schestakow, Maria and Milow, Barbara and Rege, Ameya Govind (2022) Microstructural and mechanical properties of cellulose aerogels. 6th International Seminar on Aerogels, 28.-30. Sep. 2022, Hamburg, Deutschland.

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Abstract

The nanostructure of cellulose aerogels consists of nanofibrils that are interconnected in a three-dimensional (3-d) space. The properties of cellulose aerogels are influenced by their nanofibrillar network which necessitates the analysis of their porous nanostructure using computational reconstruction methods. These mechanically strong aerogels are synthesized from aqueous salt hydrate melts [1] and tensile and compressive tests are conducted to investigate their mechanical properties. Furthermore, the structural properties such as the bulk and skeletal densities and the pore-size distributions are described. These pore-size distributions are used to generate a 3-d random close packing of polydisperse spheres [2] where the volume distribution of the spheres adheres to the pore-size distribution of aerogels. Then, Laguerre Voronoi tessellations [3] are generated on these spheres to obtain an open-porous fibrillar network while retaining the initial pore-volume distribution and thus corresponding to the 3-d nanostructure of aerogels. To investigate the macroscopic mechanical properties of these aerogels based on the modelled nanostructure, the open-porous networks are imported into a finite-element program as representative volume elements (RVE). The elastic as well as the inelastic features are described and validated with corresponding experimental data. [1] Rege A., Schestakow M., Karadagli I., Ratke L., & Itskov M., Soft Matter, 12, 7079-7088, 2016 [2] Lubachevsky B. Z. & Stillinger F. H., Journal of Statistical Physics, 60(5), 561-583, 1990 [3] Imai H., Iri M., & Murota K., SIAM Journal on Computing, 14(1), 93105, 1985

Item URL in elib:https://elib.dlr.de/188757/
Document Type:Conference or Workshop Item (Poster)
Title:Microstructural and mechanical properties of cellulose aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Aney, ShivangiShivangi.Aney (at) dlr.deUNSPECIFIED
Schestakow, MariaMaria.Schestakow (at) dlr.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Rege, Ameya GovindAmeya.Rege (at) dlr.dehttps://orcid.org/0000-0001-9564-5482
Date:28 September 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:cellulose, aerogel, mechanical properties, modeling
Event Title:6th International Seminar on Aerogels
Event Location:Hamburg, Deutschland
Event Type:international Conference
Event Dates:28.-30. Sep. 2022
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 - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rege, Dr. Ameya Govind
Deposited On:27 Oct 2022 08:58
Last Modified:27 Oct 2022 08:58

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