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Electrocoiling-guided printing of multiscale architectures at single-wavelength resolution

Abstract

The rope coiling observed in liquid ink with high viscosity has been exploited in additive printing to fabricate architectures with periodically curled structures and tune their mechanical properties. However, the control over the coiling path relying on mechanical motion restricts spatiotemporal resolution. We develop an electrically assisted high-resolution technique to manipulate coiling paths of viscous ink and structures of the deposited filament. By spatially programming the voltage applied onto the viscous ink, we show that the switching between different filament structures can be accomplished at single wavelength resolution, facilitating the rapid and accurate construction of sophisticated patterns. Furthermore, translational guiding of the electrocoiling enables rapid printing of filament with complex structures at a line speed of 102 mm/s. With simplified trajectory of the printing head, large-area and multiscale patterns can be printed at an unprecedented speed; for instance, centimeter-sized architectures constructed by nanofiber with micron-sized curled structures can be completed in a few minutes. By enabling the printing of complex fiber networks with tunable shape and density, our work provides a route towards custom-design of fiber architecture with unique features such as spatially varying mechanical properties.

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Publication details

The article was accepted on 12 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9LC00145J
Citation: Lab Chip, 2019, Accepted Manuscript

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    Electrocoiling-guided printing of multiscale architectures at single-wavelength resolution

    J. Li, T. Kong, J. Yu, K. H. LEE, Y. H. Tang, K. W. kwok, J. T. KIM and H. C. Shum, Lab Chip, 2019, Accepted Manuscript , DOI: 10.1039/C9LC00145J

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