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3D Printing Hierarchical Porous Materials http://bit.ly/2RR1W1E Hierarchical porous materials are commonly found in nature and have numerous applications as well, such as catalytic supports, biological scaffolds and lightweight structures. 3D printing has allowed for the fabrication of porous materials in the forms of lattices, cellular structures and foams across multiple length scales. However, according to a group of researchers in a paper entitled “3D printing of sacrificial templates into hierarchical porous materials,” current approaches “do not allow for the fast manufacturing of bulk porous materials featuring pore sizes that span broadly from macroscopic dimensions down to the nanoscale.” In the research paper, the authors describe how they developed ink formulations to enable 3D printing of hierarchical materials displaying porosity at the nano-, micro- and macro-scales.
The researchers formed stable nanodroplets through a two-step emulsification process. These nanodroplets are stable enough to be concentrated by ultracentrifugation and form a dense jammed template that can be directly converted into a nanoporous structure upon drying or sintering depending on the oil volatility.
Since the nano- and micro-porosity are generated from the self-assembly of templating droplets and particles within the ink, as opposed to the slow sequential depositing of material, the 3D printing process is simple and fast. Because they are susceptible to coalescence during ink preparation, the templating droplets need to be stabilized by particles that will later form the walls of the pores created upon drying and consolidation.
Authors of the paper include Lauriane Alison, Stefano Menasce, Florian Bouville, Elena Tervoort, Iacopo Mattich, Allesandro Ofner and André R. Studart. Discuss this and other 3D printing topics at 3DPrintBoard.com or share your thoughts below.
Printing via 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing https://3dprint.com January 28, 2019 at 12:33AM
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