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Systematic studies of tannin–formaldehyde aerogels: preparation and properties

Gelation of tannin–formaldehyde (TF) solutions was systematically investigated by changing pH and concentration of TF resin in water. In this way we constructed the TF phase diagram, from which chemical hydrogels could be described, and also synthesized thermoreversible tannin-based hydrogels. Condi...

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Autores principales: Amaral-Labat, Gisele, Szczurek, Andrzej, Fierro, Vanessa, Pizzi, Antonio, Celzard, Alain
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5090577/
https://www.ncbi.nlm.nih.gov/pubmed/27877559
http://dx.doi.org/10.1088/1468-6996/14/1/015001
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author Amaral-Labat, Gisele
Szczurek, Andrzej
Fierro, Vanessa
Pizzi, Antonio
Celzard, Alain
author_facet Amaral-Labat, Gisele
Szczurek, Andrzej
Fierro, Vanessa
Pizzi, Antonio
Celzard, Alain
author_sort Amaral-Labat, Gisele
collection PubMed
description Gelation of tannin–formaldehyde (TF) solutions was systematically investigated by changing pH and concentration of TF resin in water. In this way we constructed the TF phase diagram, from which chemical hydrogels could be described, and also synthesized thermoreversible tannin-based hydrogels. Conditions of non-gelation were also determined. Hydrogels were dried in supercritical CO(2), leading to a broad range of TF aerogels. The latter were investigated for volume shrinkage, total porosity, micro-, meso- and macropore volumes, Brunauer–Emmett–Teller (BET) surface area, microscopic texture, mechanical and thermal properties. All these properties are discussed in relation to each other, leading to an accurate and self-consistent description of these bioresource-based highly porous materials. The conditions for obtaining the highest BET surface area or mesopore volume were determined and explained in relation to the preparation conditions. The highest BET surface area, 880 m(2) g(−1), is remarkably high for organic aerogels derived from a natural resource.
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spelling pubmed-50905772016-11-22 Systematic studies of tannin–formaldehyde aerogels: preparation and properties Amaral-Labat, Gisele Szczurek, Andrzej Fierro, Vanessa Pizzi, Antonio Celzard, Alain Sci Technol Adv Mater Papers Gelation of tannin–formaldehyde (TF) solutions was systematically investigated by changing pH and concentration of TF resin in water. In this way we constructed the TF phase diagram, from which chemical hydrogels could be described, and also synthesized thermoreversible tannin-based hydrogels. Conditions of non-gelation were also determined. Hydrogels were dried in supercritical CO(2), leading to a broad range of TF aerogels. The latter were investigated for volume shrinkage, total porosity, micro-, meso- and macropore volumes, Brunauer–Emmett–Teller (BET) surface area, microscopic texture, mechanical and thermal properties. All these properties are discussed in relation to each other, leading to an accurate and self-consistent description of these bioresource-based highly porous materials. The conditions for obtaining the highest BET surface area or mesopore volume were determined and explained in relation to the preparation conditions. The highest BET surface area, 880 m(2) g(−1), is remarkably high for organic aerogels derived from a natural resource. Taylor & Francis 2013-02-01 /pmc/articles/PMC5090577/ /pubmed/27877559 http://dx.doi.org/10.1088/1468-6996/14/1/015001 Text en © 2013 National Institute for Materials Science http://creativecommons.org/licenses/by-nc-sa/3.0/ Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 licence (http://creativecommons.org/licenses/by-nc-sa/3.0) . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
spellingShingle Papers
Amaral-Labat, Gisele
Szczurek, Andrzej
Fierro, Vanessa
Pizzi, Antonio
Celzard, Alain
Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title_full Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title_fullStr Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title_full_unstemmed Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title_short Systematic studies of tannin–formaldehyde aerogels: preparation and properties
title_sort systematic studies of tannin–formaldehyde aerogels: preparation and properties
topic Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5090577/
https://www.ncbi.nlm.nih.gov/pubmed/27877559
http://dx.doi.org/10.1088/1468-6996/14/1/015001
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