Presentation Information
[P04-488]Bioinspired Architected Cellulosic Nano-Composites via Direct Ink Write Printing
○Emi Taguchi1, Adrian Francisco Ornelas1, Atsushi Arakaki2, David Kisailus1 (1. Department of Materials Science and Engineering, University of California Irvine (USA), 2. Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology (Japan))
Keywords:
Hydrogel,Direct Ink Write Printing,Beetle,Bio-inspired materials,Cellulose,Structure,Structure-Function,Mechanical testing,Additive manufacturing
[Purpose]
The Diabolical Ironclad Beetle (Phloeodes diabolicus) exhibits exceptional impact and crush resistance despite being composed primarily of organic materials. This is due, in part, to biologically controlled fiber alignment that yields a helicoidal architecture displayed in its cuticles, which provides significant toughness. Inspired by this biologically controlled architecture, extrusion-induced alignment of cellulosic fiber reinforced alginate hydrogels via Direct Ink Write (DIW) printing are utilized to fabricate structures with tunable mechanical properties. The ultimate goal is to establish a printing platform capable of translating biological designs with controlled fiber orientation within hydrogel structures that demonstrate regulated deformation behavior.
[Method]
Hydrogel inks composed of sodium alginate and cellulose nanofibers were prepared as a printable composite system. During DIW printing extrusion, shear forces within the nozzle induce preferential alignment of cellulose nanofibers along the printing direction, producing anisotropic reinforcement within deposited filaments. After printing, structures were ionically crosslinked using calcium chloride to form stable hydrogel networks through coordination with guluronic acid blocks in alginate chains. Printing parameters including extrusion pressure, translation velocity, nozzle height, and dwell timing were varied to control filament morphology and extent of fiber alignment. Planar geometries with controlled layer orientations were fabricated and characterized using optical, confocal, and scanning electron microscopy to evaluate dimensional fidelity and deformation behavior during mechanical testing.
[Results]
Preliminary results indicate that extrusion-aligned cellulose nanofibers produce orientation-dependent swelling in printed architectures. Optimization of extrusion pressure and nozzle height improves filament uniformity and reduces material accumulation at print inflections, enabling more consistent anisotropic responses across printed features. Ongoing experiments aim to quantify the relationship between fiber alignment, layer orientation, and extent of curvature.
[Consideration]
These findings indicate that extrusion-induced alignment provides an accessible strategy for reproducing biologically inspired anisotropic behavior in soft composite materials. By translating structural designs observed in the Diabolical Ironclad Beetle into a DIW printing-compatible hydrogel platform, this work establishes a pathway toward multifunctional material innovation using programmable shape-morphing architectures with sustainable material systems. Future efforts will focus on implementing helicoidal fiber orientations using biologically derived materials from the Diabolical Ironclad Beetle system to further emulate layered reinforcement mechanisms responsible for the beetle’s exceptional toughness.
[Conclusion]
Extrusion-aligned cellulose nanofibers produced orientation-dependent deformation in printed hydrogel structures, demonstrating the feasibility of programming anisotropic responses through DIW printing. This work establishes a pathway for integrating biologically inspired fiber architectures into additively manufactured soft composites and supports future implementation of helicoidal reinforcement strategies for adaptive material systems.
The Diabolical Ironclad Beetle (Phloeodes diabolicus) exhibits exceptional impact and crush resistance despite being composed primarily of organic materials. This is due, in part, to biologically controlled fiber alignment that yields a helicoidal architecture displayed in its cuticles, which provides significant toughness. Inspired by this biologically controlled architecture, extrusion-induced alignment of cellulosic fiber reinforced alginate hydrogels via Direct Ink Write (DIW) printing are utilized to fabricate structures with tunable mechanical properties. The ultimate goal is to establish a printing platform capable of translating biological designs with controlled fiber orientation within hydrogel structures that demonstrate regulated deformation behavior.
[Method]
Hydrogel inks composed of sodium alginate and cellulose nanofibers were prepared as a printable composite system. During DIW printing extrusion, shear forces within the nozzle induce preferential alignment of cellulose nanofibers along the printing direction, producing anisotropic reinforcement within deposited filaments. After printing, structures were ionically crosslinked using calcium chloride to form stable hydrogel networks through coordination with guluronic acid blocks in alginate chains. Printing parameters including extrusion pressure, translation velocity, nozzle height, and dwell timing were varied to control filament morphology and extent of fiber alignment. Planar geometries with controlled layer orientations were fabricated and characterized using optical, confocal, and scanning electron microscopy to evaluate dimensional fidelity and deformation behavior during mechanical testing.
[Results]
Preliminary results indicate that extrusion-aligned cellulose nanofibers produce orientation-dependent swelling in printed architectures. Optimization of extrusion pressure and nozzle height improves filament uniformity and reduces material accumulation at print inflections, enabling more consistent anisotropic responses across printed features. Ongoing experiments aim to quantify the relationship between fiber alignment, layer orientation, and extent of curvature.
[Consideration]
These findings indicate that extrusion-induced alignment provides an accessible strategy for reproducing biologically inspired anisotropic behavior in soft composite materials. By translating structural designs observed in the Diabolical Ironclad Beetle into a DIW printing-compatible hydrogel platform, this work establishes a pathway toward multifunctional material innovation using programmable shape-morphing architectures with sustainable material systems. Future efforts will focus on implementing helicoidal fiber orientations using biologically derived materials from the Diabolical Ironclad Beetle system to further emulate layered reinforcement mechanisms responsible for the beetle’s exceptional toughness.
[Conclusion]
Extrusion-aligned cellulose nanofibers produced orientation-dependent deformation in printed hydrogel structures, demonstrating the feasibility of programming anisotropic responses through DIW printing. This work establishes a pathway for integrating biologically inspired fiber architectures into additively manufactured soft composites and supports future implementation of helicoidal reinforcement strategies for adaptive material systems.
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