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On the origin of power-scaling exponents in silica aerogels

Aney, Shivangi and Pandit, Prakul and Ratke, Lorenz and Milow, Barbara and Rege, Ameya Govind (2023) On the origin of power-scaling exponents in silica aerogels. Journal of Sol-Gel Science and Technology. Springer. doi: 10.1007/s10971-023-06156-0. ISSN 0928-0707.

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The macroscopic properties of open-porous cellular materials hinge upon the microscopic skeletal architecture and features of the material. Typically, bulk material properties, viz. the elastic modulus, strength of the material, thermal conductivity, and acoustic velocity, of such porous materials are expressed in terms of power-scaling laws against their density. In particular, the relation between the elastic modulus and the density has been intensively investigated. While the Gibson and Ashby model predicts an exponent of 2 for ideally connected foam-like open-cellular solids, the exponent is found to lie between 3 and 4 for silica aerogels. In this paper, we investigate the origins of this scaling exponent. Particularly, the effect of the pearl-necklace-like skeletal features of the pore walls and that of the random spatial arrangement is extensively computationally studied. It is shown that the latter is the driving factor in dictating the scaling exponent and the rest of the features play a negligible or no role in quantifying the scaling exponent.

Item URL in elib:https://elib.dlr.de/196751/
Document Type:Article
Title:On the origin of power-scaling exponents in silica aerogels
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Pandit, PrakulUNSPECIFIEDhttps://orcid.org/0000-0002-1343-3046146019678
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Rege, Ameya GovindUNSPECIFIEDhttps://orcid.org/0000-0001-9564-5482UNSPECIFIED
Date:26 June 2023
Journal or Publication Title:Journal of Sol-Gel Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Series Name:2023, JSST 30th Anniversary
Keywords:aerogels, scaling exponents, microstructure modelling, silica aerogels, DLCA
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: Pandit, Prakul
Deposited On:06 Nov 2023 09:13
Last Modified:30 Jan 2024 10:39

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