| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Sintering and Related Powder Processing Science and Technologies
|
| Presentation Title |
On the Bending of High-aspect Ratio Freestanding Aerosol Jet Printed Micropillar Arrays during Thermal Sintering |
| Author(s) |
Sandra Ritchie, Sasa Kovacevic, Prithviraj Deshmukh, Mohammad Sadeq Saleh, Sinisa Mesarovic, Rahul Panat |
| On-Site Speaker (Planned) |
Sandra Ritchie |
| Abstract Scope |
High-aspect ratio free-standing micropillars have several technologically important applications such as neural probes, biosensors, and microelectronics. Freestanding micropillars with aspect ratios of 20:1 have been previously fabricated by our group. Increasing pillar length and aspect ratios to 60:1 has thus far been limited by the warping, which occurs during the post-printing thermal sintering of the nanoparticles. As such, it has become necessary to increase our understanding of the fundamental mechanisms of nanoparticle sintering and to develop effective control parameters to prevent or minimize warping. The use of optical and thermal in-situ imaging has allowed for the discovery and study of coordinated motion found in arrays of pillars. This motion results from temperature gradients present during sintering, which can cause differential sintering rates, hence the distortion. Based on these findings, successful engineering solutions have been developed which allows repeatable fabrication of long, straight pillars with aspect ratios as high as 60:1. |