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Analysis of the fractal properties of silica aerogels using diffusion-limited aggregation

Abdusalamov, Rasul and Itskov, Mikhail and Milow, Barbara and Rege, Ameya Govind (2021) Analysis of the fractal properties of silica aerogels using diffusion-limited aggregation. Proceedings in Applied Mathematics and Mechanics, 20 (1), e202000099. Wiley. doi: 10.1002/pamm.202000099. ISSN 1617-7061.

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Official URL: https://onlinelibrary.wiley.com/doi/10.1002/pamm.202000099

Abstract

Silica aerogels are highly porous solids with very low densities and thermal conductivities. Their high porosity results in a fractal morphology which has a strong influence on mechanical properties. In this work, the diffusion-limited cluster aggregation (DLCA) method is implemented to model silica aerogel aggregates. A preliminary model based on this approach demonstrates good agreement with experimental data [1]. The influence on the fractal properties of different input parameters as for example the particle size is investigated. Moreover, the resulting geometries are compared to fractal features of silica aerogels determined by experimental data from small angle X-ray scattering (SAXS). The mechanical response of these aggregation models is analyzed by a finite element analysis (FEA) for the generated representative volume elements (RVE). The effect of varying densities on the mechanical properties, for e.g., Young's modulus, is further elucidated.

Item URL in elib:https://elib.dlr.de/140637/
Document Type:Article
Title:Analysis of the fractal properties of silica aerogels using diffusion-limited aggregation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Abdusalamov, RasulRWTH Aachen UniversityUNSPECIFIED
Itskov, MikhailRWTH Aachen UniversityUNSPECIFIED
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:2021
Journal or Publication Title:Proceedings in Applied Mathematics and Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:20
DOI :10.1002/pamm.202000099
Page Range:e202000099
Publisher:Wiley
ISSN:1617-7061
Status:Published
Keywords:silica aerogel, DLCA, fractal, mechanical
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rege, Dr. Ameya Govind
Deposited On:01 Feb 2021 12:48
Last Modified:01 Feb 2021 12:48

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