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Some comments on the effect of skeletal features on the properties of aerogels

Rege, Ameya Govind and Ratke, Lorenz and Aney, Shivangi and Milow, Barbara (2022) Some comments on the effect of skeletal features on the properties of aerogels. 6th International Seminar on Aerogels, 28.-30. Sep. 2022, Hamburg, Deutschland.

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Abstract

Generally, for porous materials like aerogels, the density is considered to be the responsible factor dictating their mechanical properties. In this contribution, we will systematically analyse three parameters, viz., the density, the pore-size distribution, and the pore-wall thickness, for their effect on the bulk mechanical properties. It will be demonstrated that although density remains an important parameter governing the mechanical stiffness, the other two parameters do not have a negligible effect. Furthermore, most aerogels do not show a constant cross-section for their pore walls due to the pearl-necklace-like morphology. In the second part, the effect of this pearl-necklace-like morphology on the pore sizes and the mechanical properties will be elucidated. First, mathematical models for their pore-sizes will be described. Three scenarios will be discussed, where the pore sizes are calculated for cells in two dimensions, three dimensions (3-d) and in 3-d with overlapping particles representing necks. The dependency of the skeletal features on the resulting pore size will be shown. The model for pore walls with 3-d overlapping spheres will be subjected to axial stretching, bending and buckling. The effect of the particle sizes and the amount of overlap between the particles on the corresponding mechanical features will be illustrated. The results will also be compared with models that assume constant cross-section of pore-walls. It will be demonstrated that neglecting the corrugations arising from the pearl-necklace-like morphology in aerogel-like materials can result in serious misinterpretations of their mechanical properties.

Item URL in elib:https://elib.dlr.de/188741/
Document Type:Conference or Workshop Item (Speech)
Title:Some comments on the effect of skeletal features on the properties of aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rege, Ameya GovindAmeya.Rege (at) dlr.dehttps://orcid.org/0000-0001-9564-5482
Ratke, LorenzLorenz.Ratke (at) dlr.deUNSPECIFIED
Aney, ShivangiShivangi.Aney (at) dlr.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:30 September 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aerogel, skeletal, pore wall, pore size, mechanical properties
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 08:56
Last Modified:27 Oct 2022 08:56

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