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Zachary Kennedy1 Josef Christ1 Kent Evans1 Bruce Arey1 Timothy Pope1 Marvin Warner1 Satish Nune1 Chris Barrett1 Rebecca Erikson1

1, Pacific Northwest National Laboratory, Richland, Washington, United States

Increasing the future impacts and implementation of 3D printing technologies is expected to depend heavily on the ability to develop high-performance input materials. Typical feedstocks, such as thermoplastics, are used primarily for their mechanical and structural properties and possess little intrinsic functionality to participate in desirable chemical interactions post-printing. Here, we will discuss our efforts to produce new composites for use in standard benchtop printers aimed at expanding the utility of 3D-printed components. We will detail fluoropolymer-carbon nanotube conductive composites that may be printed into flexible, low-cost, chemiresistors. Further, we will provide approaches to uniformly introduce metal-organic framework (MOF) particles into thermoplastic objects and yield composites with potential for applied use as catalysts or in separations. These MOF-composites possess unique porous features and high-surface areas and retain their sophisticated reactivity profiles (i.e. interact with and/or accommodate small molecule and gaseous guests). The formulation strategy also mitigates the poor mechanical properties typical of a pure MOF (powder). Lastly, filaments doped with lanthanide (Ln)-based nanomaterials will be described. The robust optical signatures are retained in the printed Ln-objects and used as inputs in support of a new anti-counterfeiting protocol. Characterization of feedstocks and prints by techniques such as helium ion microscopy, fluorescence, thermal analysis, and gas adsorption will be emphasized throughout the presentation.

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