Bioinspired Mechanical Gradients in Cellulose Nanofibril/Polymer Nanopapers. (8th April 2016)

• Record Type: Journal Article
• Authors: Wang, Baochun; Benitez, Alejandro J.; Lossada, Francisco; Merindol, Remi; Walther, Andreas
• Is Part Of: Angewandte Chemie. Volume 128:Number 20(2016)
• Page Start: 6070
• Page End: 6074
• Publication Date: 2016-04-08
• Subjects: 3D-Druck -- Bioinspirierte Nanokomposite -- Gradientenmaterialien -- Nanocellulose -- Selbstorganisation; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201511512
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Mechanical gradients are important as tough joints, for strain field engineering in printable electronics, for actuators, and for biological studies, yet they are difficult to prepare and quantitatively characterize. We demonstrate the additive fabrication of gradient bioinspired nanocomposites based on stiff, renewable cellulose nanofibrils that are bottom‐up toughened via a tailor‐made copolymer. Direct filament writing of different nanocomposite hydrogels in patterns, and subsequent healing of the filaments into continuous films while drying leads to a variety of linear, parabolic and striped bulk gradients. In situ digital image correlation under tensile deformation reveals important differences in the strain fields regarding asymmetry and step heights of the patterns. We envisage that merging top‐down and bottom‐up structuring of nanocellulose hybrids opens avenues for aperiodic and multiscale, bioinspired nanocomposites with optimized combinations of stiffness and toughness. Abstract : Direkter Filamentdruck von Nanokompositen aus Zellulose‐Nanofasern und Polymeren ermöglicht die gezielte Generierung mechanischer Spannungsfeldgradienten. Solche Materialien haben Anwendungspotential für robustere Materialverbindungen, für grundlegende Studien der Zell/Material‐Wechselwirkung und als Substrat zum Druck elektronischer Schaltkreise.