Journal
ACS BIOMATERIALS SCIENCE & ENGINEERING
Volume 2, Issue 10, Pages 1796-1799Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.6b00184
Keywords
3D printing; microgel; yield stress material; liquid-like solid; high-speed; Reynold's number
Categories
Funding
- National Science Foundation [DMR-1352043]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1352043] Funding Source: National Science Foundation
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Fluid instabilities limit the ability of features to hold their shape in many types of 3D printing as liquid inks solidify into written structures. By 3D printing directly into a continuum of jammed granular microgels, these instabilities are circumvented by eliminating surface tension and body forces. However, this type of 3D printing process is potentially limited by inertial instabilities if performed at high speeds where turbulence may destroy features as they are written. Here, we design and test a high-speed 3D printing experimental system to identify the instabilities that arise when an injection nozzle translates at 1 m/s. We find that the viscosity of the injected material can control the Reynold's instability, and we discover an additional, unanticipated instability near the top surface of the granular microgel medium.
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