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The three-dimensional structure of flexible resorcinol-formaldehyde aerogels investigated by means of holotomography

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/
Document Type:Article
Title:The three-dimensional structure of flexible resorcinol-formaldehyde aerogels investigated by means of holotomography
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tannert, Renérene.tannert (at) dlr.dehttps://orcid.org/0000-0001-9484-8886
Schwan, Marinamarina.schwan (at) dlr.deUNSPECIFIED
Rege, Ameyarwth aachenhttps://orcid.org/0000-0001-9564-5482
Eggeler, Mariomario.eggeler (at) dlr.deUNSPECIFIED
da Silva, Julio Cesarjdasilva (at) esrf.frhttps://orcid.org/0000-0001-8035-0550
Bartsch, Marionmarion.bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928
Milow, Barbarabarbara.milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Itskov, Mikhailitskov (at) km.rwth-aachen.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.dehttps://orcid.org/0000-0003-2487-4717
Date:27 March 2017
Journal or Publication Title:Journal of Sol-Gel Science and Technology
Refereed publication:Yes
Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:84
DOI :10.1007/s10971-017-4363-6
Page Range:pp. 391-399
Editors:
EditorsEmail
Smirnova, IrinaTU Hamburg-Harburg
Rigacci, ArnaudMines ParisTech
Budtova, TatianaMines ParisTech
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:31 Jul 2019 20:09

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