Digital Light Processing in a Hybrid Atomic Force Microscope: In situ, Nanoscale Characterization of the Printing Process
| Autor: | Jason P. Killgore, Tobin E. Brown, Callie I. Higgins |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Biomedical Engineering 3D printing FOS: Physical sciences Nanotechnology 02 engineering and technology computer.software_genre Industrial and Manufacturing Engineering law.invention 020901 industrial engineering & automation law Voxel General Materials Science Process optimization Engineering (miscellaneous) Nanoscopic scale Stereolithography Condensed Matter - Materials Science Modality (human–computer interaction) business.industry Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Characterization (materials science) Digital Light Processing 0210 nano-technology business computer |
| Popis: | Stereolithography (SLA) and digital light processing (DLP) are powerful additive manufacturing techniques that address a wide range of applications including regenerative medicine, prototyping, and manufacturing. Unfortunately, these printing processes introduce micrometer-scale anisotropic inhomogeneities due to the resin absorptivity, diffusivity, reaction kinetics, and swelling during the requisite photoexposure. Previously, it has not been possible to characterize high-resolution mechanical heterogeneity as it develops during the printing process. By combining DLP 3D printing with atomic force microscopy in a hybrid instrument, heterogeneity of a single, in situ printed voxel is characterized. Here, we describe the instrument and demonstrate three modalities for characterizing voxels during and after printing. Sensing Modality I maps the mechanical properties of just-printed, resin-immersed voxels, providing the framework to study the relationships between voxel sizes, print exposure parameters, and voxel-voxel interactions. Modality II captures the nanometric, in situ working curve and is the first demonstration of in situ cure depth measurement. Modality III dynamically senses local rheological changes in the resin by monitoring the viscoelastic damping coefficient of the resin during patterning. Overall, this instrument equips researchers with a tool to develop rich insight into resin development, process optimization, and fundamental printing limits. 17 pages, 4 figures, 1 table |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|