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The effect of pulverization methods on the microstructure of carbon aerogels

Schwan, Marina and Schettler, Jessica and Milow, Barbara and Smarsly, Bernd and Badaczewski, Felix (2020) The effect of pulverization methods on the microstructure of carbon aerogels. Carbon Materials and Nanotechnology Summit, 29.09.2020, Online (Singapur).

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Carbon aerogels are suitable for many fields of application. In many cases powders are required and pulverization is necessary. But how can we take care on material quality as various changes in the microstructure of carbon aerogels are induced by pulverization?. The extent of changes depends not only on the dominant forces of used technique, but also on the mechanical and structural properties of initial monolithic samples. Various methods are available to produce carbon aerogels in a powdered form. the first of all monolithic samples of carbon aerogels can easily be grinded manually using sand paper. The accruing powder is collected from the surface and can be used for any application. During the grinding process, only low forces are applied to the sample which makes the method applicable for fragile or soft materials. Among many milling techniques, shaker milling is based on frequent percussions of a steel or ceramic bar or balls inside of the milling container. Depending on frequency, the steel bar will oscillate in the container and through the powerful impacts, crush the sample. Shaker mills are often used under cryo temperatures, whereby the container is arranged in liquid nitrogen. On the other hand milling in a planetary ball mill is the most frequently used method to get carbon aerogel powder, where the monolithic aerogel is placed in a container with balls. In the present work, we discuss the influence of grinding, milling in shaker cryo mill and planetary ball mill on stiff, ductile and flexible carbon aerogels. Results show that stiff carbon aerogels do not undergo noticeable changes. In contrast, ductile carbon aerogels are very sensitive to friction forces. Soft and flexible carbon aerogels undergo drastic changes in the microstructure.

Item URL in elib:https://elib.dlr.de/136346/
Document Type:Conference or Workshop Item (Speech)
Title:The effect of pulverization methods on the microstructure of carbon aerogels
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schwan, MarinaUNSPECIFIEDhttps://orcid.org/0000-0001-6329-8164
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728
Date:September 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:carbon aerogels, milling, grinding, surface area
Event Title:Carbon Materials and Nanotechnology Summit
Event Location:Online (Singapur)
Event Type:international Conference
Event Dates:29.09.2020
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Methods and Concepts for Materials Development
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Energy Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Schwan, Marina
Deposited On:19 Oct 2020 10:11
Last Modified:14 Jan 2021 07:33

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