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Your search keyword '"Konstantin Kriechbaum"' showing total 4 results
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4 results on '"Konstantin Kriechbaum"'

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

Author

Tamara L. Church, Konstantin Kriechbaum, Carina Schiele, Varvara Apostolopoulou-Kalkavoura, Seyed Ehsan Hadi, and Lennart Bergström

Subjects
Biomaterials, Aerosols, Mesembryanthemum, Polymers and Plastics, Ice, Materials Chemistry, Water, Bioengineering, Methylcellulose, Cellulose
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

Published
2022

4. Nanodancing with Moisture: Humidity‐Sensitive Bilayer Actuator Derived from Cellulose Nanofibrils and Reduced Graphene Oxide.

Author

Héraly, Frédéric, Zhang, Miao, Åhl, Agnes, Cao, Wei, Bergström, Lennart, and Yuan, Jiayin

Subjects
MOISTURE, HUMIDITY, GRAPHENE oxide, ACTUATORS, SMART materials
Abstract

Bilayer actuators, traditionally consisting of two laminated materials, are the most common types of soft or hybrid actuators. Herein, a nanomaterial‐based organic–inorganic humidity‐sensitive bilayer actuator composed of TEMPO‐oxidized cellulose nanofibrils (TCNF‐Na+) and reduced graphene oxide (rGO) sheets is presented. The hybrid actuator displays a large humidity‐driven locomotion with an atypical fast unbending. Cationic exchange of the anionically charged TCNF‐Na+ and control of the layer thickness is used to tune and dictate the locomotion and actuator's response to humidity variations. Assembly of a self‐oscillating electrical circuit, that includes a conductive rGO layer, displays autonomous on‐and‐off lighting in response to actuation‐driven alternating electrical heating. [ABSTRACT FROM AUTHOR]

Published
2022
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