期刊
POLYMERS
卷 13, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/polym13213750
关键词
stereolithography additive manufacturing; monolithic polymeric microfluidics; high aspect ratio microchannels
资金
- Ministry of Science and Technology [MOST 110-2628-E-011-006]
- Mechanical Engineering Department of the National Taiwan University of Science and Technology (NTUST)
Stereolithographic printing is used for creating microfluidic devices, but challenges exist in forming microchannels smaller than 500 μm with good inner surface quality. Through experiments, it was found that a three-step printing process can improve dimensional accuracy and inner microchannel surface quality, allowing the successful manufacture of high-aspect-ratio microchannels in a short time.
Stereolithographic printing (SL) is widely used to create mini/microfluidic devices; however, the formation of microchannels smaller than 500 mu m with good inner surface quality is still challenging due to the printing resolution of current commercial printers and the z-overcure error and scalloping phenomena. In the current study, we used SL printing to create microchannels with the aim of achieving a high degree of dimensional precision and a high-quality microchannel inner surface. Extensive experiments were performed and our results revealed the following: (1) the SL printing of microchannels can be implemented in three steps including channel layer printing, an oxygen inhibition process, and roof layer printing; (2) printing thickness should be reduced to minimize the scalloping phenomenon, which significantly improves dimensional accuracy and the quality of inner microchannel surfaces; (3) the inclusion of an oxygen inhibition step is a critical and efficient approach to suppressing the z-overcure error in order to eliminate the formation of in-channel obstructions; (4) microchannels with an extremely high aspect ratio of 40:1 (4000 mu m in height and 100 mu m in width) can be successfully manufactured within one hour by following the three-step printing process.
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