DOI: https://doi.org/10.29363/nanoge.incnc.2021.020
Publication date: 8th June 2021
Colloidal synthesis routes allow precise control over material parameters at the nanometer scale with moderate capital or operating costs and with high-throughput production and material yields. Stimulated by its simplicity and huge potential, countless groups all around the world have developed an extensive library of synthetic strategies and routes to produce nanocrystals with almost any composition, size and shape. However, for such control over material parameters at the nanoscale to truly impact real applications, colloidal nanocrystals need to be arranged into functional patterns, thin films, porous nanomaterials or highly dense nanocomposites, depending on the application. Additive manufacturing technologies based on layer-by-layer deposition of material ejected from a nozzle in the form of ink are well-suited to produce macroscopic structures from colloids, but are limited in terms of printing speed and resolution. Electrohydrodynamic (EHD) jetting uniquely allows generating submicrometer jets that can reach speeds above 1 m s-1, but such jets cannot be precisely collected by too slow mechanical stages. In this talk, I will present our progress in the control of the jet trajectory in EHD jetting technologies through a voltage applied to electrodes located around the jet. This method allows to continuously adjust the jet trajectory with lateral accelerations up to 106 m s-2. Through electrostatically deflecting the jet, 3D objects with submicrometer features can be printed by stacking material layers on top of each other at layer-by-layer frequencies as high as 2000 Hz. The fast jet speed and large layer-by-layer frequencies achieved translate into printing speeds up to 0.5 m s-1 in-plane and 0.4 mm s-1 in the vertical direction, three to four orders of magnitude faster than techniques providing equivalent feature sizes.
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