Tannert, René and Schwan, Marina and Rege, Ameya and Eggeler, Mario and da Silva, Julio Cesar and Bartsch, Marion and Milow, Barbara and Itskov, Mikhail and Ratke, Lorenz (2017) The three-dimensional structure of flexible resorcinol-formaldehyde aerogels investigated by means of holotomography. Journal of Sol-Gel Science and Technology, 84 (3), pp. 391-399. Springer. doi: 10.1007/s10971-017-4363-6. ISSN 0928-0707.
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Official URL: http://dx.doi.org/10.1007/s10971-017-4363-6
Abstract
Organic aerogels based on resorcinol-formaldehyde gels display remarkable properties due to their pronounced nanoporosity. Therefore, studies towards the understanding of their structure-property-relationship are of high value for the design of improved materials. X-ray tomography is a technique that has been used for the structural elucidation of porous materials, but so far no highly resolved three-dimensional structures of resorcinol-formaldehyde gels have been obtained under the classical absorption-based experimental X-ray setup. This paper reports on the successful analysis of a superflexible resorcinol-formaldehyde aerogel using zoom holotomography that yielded images with an unprecedented resolution in the sub-micrometer range. The preparation of suitable powder from monolithic superflexible resorcinol-formaldehyde, the experimental conditions for tomography, and data-processing to obtain a 3D-image of the dried gel sample are described. Macropores above ca. 75 nm could be identified and visualized. They were shown to adopt almost spherical shape and to display a low connectivity. A quantitative analysis of the pore space revealed that most of the identified pores are small macropores (diameter < 0.5 µm), yet most pore volume is located in larger macropores of 1–4 µm diameter.
Item URL in elib: | https://elib.dlr.de/111914/ | ||||||||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||||||||
Title: | The three-dimensional structure of flexible resorcinol-formaldehyde aerogels investigated by means of holotomography | ||||||||||||||||||||||||||||||
Authors: |
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Date: | 27 March 2017 | ||||||||||||||||||||||||||||||
Journal or Publication Title: | Journal of Sol-Gel Science and Technology | ||||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||||||||
Volume: | 84 | ||||||||||||||||||||||||||||||
DOI: | 10.1007/s10971-017-4363-6 | ||||||||||||||||||||||||||||||
Page Range: | pp. 391-399 | ||||||||||||||||||||||||||||||
Editors: |
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Publisher: | Springer | ||||||||||||||||||||||||||||||
ISSN: | 0928-0707 | ||||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||||
Keywords: | Aerogels 3D-structure Holotomography Pore-size distribution | ||||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||||||||
HGF - Program: | Transport | ||||||||||||||||||||||||||||||
HGF - Program Themes: | Terrestrial Vehicles (old) | ||||||||||||||||||||||||||||||
DLR - Research area: | Transport | ||||||||||||||||||||||||||||||
DLR - Program: | V BF - Bodengebundene Fahrzeuge | ||||||||||||||||||||||||||||||
DLR - Research theme (Project): | V - NGC Fahrzeugstruktur (old) | ||||||||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Research > Aerogele Institute of Materials Research > Experimental and Numerical Methods | ||||||||||||||||||||||||||||||
Deposited By: | Tannert, Dr. René | ||||||||||||||||||||||||||||||
Deposited On: | 01 Jun 2017 07:41 | ||||||||||||||||||||||||||||||
Last Modified: | 06 Sep 2019 15:15 |
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