Versatile Assembly of Metal–Phenolic Network Foams Enabled by Tannin–Cellulose Nanofibers

Bruno D. Mattos*, Ya Zhu, Blaise L. Tardy, Marco Beaumont, Ana Carolina R. Ribeiro, André L. Missio, Caio G. Otoni, Orlando J. Rojas

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

12 Sitaatiot (Scopus)
127 Lataukset (Pure)

Abstrakti

Metal–phenolic network (MPN) foams are prepared using colloidal suspensions of tannin-containing cellulose nanofibers (CNFs) that are ice-templated and thawed in ethanolic media in the presence of metal nitrates. The MPN facilitates the formation of solid foams by air drying, given the strength and self-supporting nature of the obtained tannin–cellulose nanohybrid structures. The porous characteristics and (dry and wet) compression strength of the foams are rationalized by the development of secondary, cohesive metal-phenolic layers combined with a hydrogen bonding network involving the CNF. The shrinkage of the MPN foams is as low as 6% for samples prepared with 2.5–10% tannic acid (or condensed tannin at 2.5%) with respect to CNF content. The strength of the MPN foams reaches a maximum at 10% tannic acid (using Fe(III) ions), equivalent to a compressive strength 70% higher than that produced with tannin-free CNF foams. Overall, a straightforward framework is introduced to synthesize MPN foams whose physical and mechanical properties are tailored by the presence of tannins as well as the metal ion species that enable the metal–phenolic networking. Depending on the metal ion, the foams are amenable to modification according to the desired application.

AlkuperäiskieliEnglanti
Artikkeli2209685
Sivumäärä10
JulkaisuAdvanced Materials
Vuosikerta35
Numero12
Varhainen verkossa julkaisun päivämäärä12 helmik. 2023
DOI - pysyväislinkit
TilaJulkaistu - 23 maalisk. 2023
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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