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Scaling the Elastic Properties of Silica Aerogels: A Modelling Insight

Pandit, Prakul and Aney, Shivangi and Rege, Ameya Govind (2023) Scaling the Elastic Properties of Silica Aerogels: A Modelling Insight. Workshop on Aerogels Characterization and Modelling, 2023-03-29 - 2023-03-31, Debrecen, Ungarn.

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The computational modelling of silica aerogels has the potential to investigate mesoporous phenomena that are difficult to accurately probe from experimental investigations. One such phenomena, the scaling behavior of the elastic modulus to density (E∝ ρ^α) in silica aerogels has been a keen research topic. Conventional open-porous materials like foams typically exhibit exponent α=2, however, for silica aerogels the value of the exponent α is typically observed to be between 3-4 [1]. While there have been several insights and discussions into the possible explanation behind this observed extraordinarily large exponent; the effect of spatial arrangement of the particles and the pearl-like necklace morphology of the pore wall remain unexplored. This influence can be effectively modelled with computational modelling of the silica aerogel microstructure and then performing finite element calculation for their mechanical properties. As such, while some research has focused on application of Brownian motion-based diffusion limited cluster-cluster aggregation (DLCA) algorithm to model the silica aerogel morphology [2], other works have looked into the application of ballistic cluster-cluster aggregation (BLCA) algorithms [3] for the same. In this contribution, a hybrid cluster-cluster aggregation (HCA) model is presented to model the silica aerogel microstructure, which provides a directionality bias factor, thus a partial ballistic nature along with the pure Brownian motion. This is critical to understand the influence of ballistic motion on the morphology of the silica aerogel microstructure and its mechanical properties. With regard to the high scaling exponent observed, to understand the effect of the pore-wall structure and the random network connectivity on the scaling mechanical properties, the phenomena are investigated individually simulating compression, once by unit structure with corrugated pore walls (having different particle neck sizes) and the other by a micro structure modeled with HCA model. REFERENCES [1] A. Emmerling, J. Fricke, Journal of Sol-Gel Science and Technology, 8, 781-788, 1997. [2] R. Abdusalamov, C. Scherdel, M. Itskov, B. Milow, G. Reichenauer, Ameya Rege, The Journal of Physical Chemistry B, 125, 1944-1950, 2021. [3] M. Grzegorczyk, M. Rybaczuk, K.Maruszewski, Chaos, Solitons & Fractals, 9(4), 1003-1011, 2004

Item URL in elib:https://elib.dlr.de/194796/
Document Type:Conference or Workshop Item (Speech)
Title:Scaling the Elastic Properties of Silica Aerogels: A Modelling Insight
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Pandit, PrakulUNSPECIFIEDhttps://orcid.org/0000-0002-1343-3046144709389
Rege, Ameya GovindUNSPECIFIEDhttps://orcid.org/0000-0001-9564-5482UNSPECIFIED
Date:1 February 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:silica aerogels, dlca, aerogels, scaling exponents
Event Title:Workshop on Aerogels Characterization and Modelling
Event Location:Debrecen, Ungarn
Event Type:Workshop
Event Start Date:29 March 2023
Event End Date:31 March 2023
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:18 Oct 2023 11:19
Last Modified:24 Apr 2024 20:55

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