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Journal of Sol-Gel Science and Technology
Erschienen in: Journal of Sol-Gel Science and Technology 3/2017

27.03.2017 | Invited Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

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

verfasst von: René Tannert, Marina Schwan, Ameya Rege, Mario Eggeler, Julio Cesar da Silva, Marion Bartsch, Barbara Milow, Mikhail Itskov, Lorenz Ratke

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2017

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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.

Graphical Abstract

https://static-content.springer.com/image/art%3A10.1007%2Fs10971-017-4363-6/MediaObjects/10971_2017_4363_Figa_HTML.gif
Vorheriger Artikel Synthesis and characterization of composite materials “aerogel-MWCNT”
Nächster Artikel Functionalized silica xerogels for adsorption of heavy metals from groundwater and soils

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Metadaten
Titel
The three-dimensional structure of flexible resorcinol-formaldehyde aerogels investigated by means of holotomography
verfasst von
René Tannert
Marina Schwan
Ameya Rege
Mario Eggeler
Julio Cesar da Silva
Marion Bartsch
Barbara Milow
Mikhail Itskov
Lorenz Ratke
Publikationsdatum
27.03.2017
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 3/2017
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-017-4363-6

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