Flexible Conductive Composites with Programmed Electrical Anisotropy Using Acoustophoresis
| Autor: | Daniel Gianola, Leanne Friedrich, Matthew R. Begley, Drew S. Melchert, Tyler R. Ray, Rachel R. Collino, Neil D. Dolinski |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Composite number FOS: Physical sciences 3D printing Applied Physics (physics.app-ph) 02 engineering and technology Bending Conductivity 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering Brittleness Electrical resistivity and conductivity General Materials Science Composite material Anisotropy Electrical conductor Condensed Matter - Materials Science business.industry Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics 021001 nanoscience & nanotechnology 0104 chemical sciences Mechanics of Materials 0210 nano-technology business |
| Zdroj: | Advanced Materials Technologies. 4:1900586 |
| ISSN: | 2365-709X |
| Popis: | 3D printing mechanically flexible composite materials with high electrical conductivity is currently hindered by the need to use high loading of conductive filler, which severely limits flexibility. Here, microstructural patterning of composite materials via acoustophoresis imparts these materials with high conductivity and flexibility simultaneously, filling a technology gap in the field. Acoustophoresis patterns filler particles into highly efficient percolated networks which utilize up to 97\% of the particles in the composite, whereas the inefficient stochastic networks of conventional dispersed-fiber composites utilize $$500 bending cycles without losses in conductivity and changing conductivity only $5$\% within cycles on average (for 2.6v\% composites). In contrast, conventional unpatterned composites with the same conductivity require such high loading that they're prohibitively brittle. Finally, modulating the shape of the applied acoustic fields allows control over the anisotropy of the conductive networks and produces materials which are either 2-D conductive, 1-D conductive, or insulating, all using the same nozzle and ink. 10 pages; 5 figures |
| Databáze: | OpenAIRE |
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