Acoustic control of microstructures during direct ink writing of two-phase materials
| Autor: | Tyler R. Ray, Matthew R. Begley, Rachel R. Collino, Leanne Friedrich |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Microfluidics 3D printing Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Rheology Electrical and Electronic Engineering Composite material Instrumentation Fumed silica Inkwell business.industry Metals and Alloys Acoustic wave Epoxy 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials visual_art visual_art.visual_art_medium Particle 0210 nano-technology business |
| Zdroj: | Sensors and Actuators A: Physical. 268:213-221 |
| ISSN: | 0924-4247 |
| Popis: | New methods to 3D print multiphase materials with tailored microstructures could expand additive manufacturing capabilities to include structures with unprecedented complexity. One promising technique to control microstructure is acoustic focusing, a method by which particles in a fluid are manipulated by acoustic waves. By combining acoustic focusing with direct ink writing (where fluid inks are solidified after extrusion), the distribution of particles in fluid matrices can be modified throughout print lines. Here, we describe the design space for acoustic focusing with direct ink writing and explore the associated trade-offs, for inks composed of epoxy resin, silica, acetone, and glass microspheres. Increasing silica content increases the viscosity, widening the spatial distribution of particles, but it improves the preservation of printed shapes. Increasing the amplitude of the acoustic wave and decreasing the printing speed allow for narrower distributions of particles in printed lines but increase the time and energy needed for the print. To quantify these trade-offs, we conducted a combinatorial study of four factors: fumed silica and acetone loadings in epoxy-based matrices (which control ink rheology), print speed, and acoustic wave amplitude. We show that after deposition, particle distributions within focused lines are preserved; particle-poor regions on the edges of focused lines spread out farther than the particle-rich regions in the middle. The present study relating device operating parameters, ink properties and printed microstructures structure provide key insights to future designs of actuated print nozzles, which target new microstructures enabled by field-assisted control. |
| Databáze: | OpenAIRE |
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