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A Stiff, Tough, and Thermally Insulating Air- and Ice-Templated Plant-Based Foam.

ABSTRACT: By forming and directionally freezing an aqueous foam containing cellulose nanofibrils, methylcellulose, and tannic acid, we produced a stiff and tough anisotropic solid foam with low radial thermal conductivity. Along the ice-templating direction, the foam was as stiff as nanocellulose-clay composites, despite being primarily methylcellulose by mass. The foam was also stiff perpendicular to the direction of ice growth, while maintaining λ_r < 25 mW m^-1 K^-1 for a relative humidity (RH) up to 65% and <30 mW m^-1 K^-1 at 80% RH. This work introduces the tandem use of two practical techniques, foam formation and directional freezing, to generate a low-density anisotropic material, and this strategy could be applied to other aqueous systems where foam formation is possible.

SUBMITTER: Church TL

PROVIDER: S-EPMC9198970 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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A Stiff, Tough, and Thermally Insulating Air- and Ice-Templated Plant-Based Foam.

Church Tamara L TL Kriechbaum Konstantin K Schiele Carina C Apostolopoulou-Kalkavoura Varvara V Hadi Seyed Ehsan SE Bergström Lennart L

Biomacromolecules 20220527 6

By forming and directionally freezing an aqueous foam containing cellulose nanofibrils, methylcellulose, and tannic acid, we produced a stiff and tough anisotropic solid foam with low radial thermal conductivity. Along the ice-templating direction, the foam was as stiff as nanocellulose-clay composites, despite being primarily methylcellulose by mass. The foam was also stiff perpendicular to the direction of ice growth, while maintaining λr < 25 mW m-1 K-1 for a ...[more]

PMID: 35621041

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