AVS 65th International Symposium & Exhibition
    Vacuum Technology Division Monday Sessions
       Session VT-MoA

Invited Paper VT-MoA1
Gas Adsorption and Desorption Properties of 3D Printed Objects

Monday, October 22, 2018, 1:20 pm, Room 203B

Session: Pumping and Outgassing
Presenter: Matt Hartings, American University
Authors: M. Hartings, American University
J. Scherschligt, National Institute of Standards and Technology
J.A. Fedchak, National Institute of Standards and Technology
Z. Ahmed, National Institute of Standards and Technology
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Additive manufacturing processes are enabling technologies, supporting advances in a number of applications where either controlled gas uptake and release or the maintenance of a good vacuum environment are critical. In each of these scenarios, a detailed understanding of how a 3D printed object interacts with gas molecules is necessary to advancing how these objects can be used in a technical setting. I will describe two 3D printed systems and their outgassing properties. In the first system, we have compared traditionally machined vacuum chambers, made of either steal or titanium, with their 3D printed counterparts. We have evaluated hydrogen outgassing at low pressures for each of these systems and analyze how the surface micro- and nano-scale structure affects these measurements. In doing so, we assess how different printing parameters can affect outgassing of the object of interest. In the second system, we have studied the gas uptake, retention, and controlled gas adsorption of polymer composites that contain metal organic framework (MOF) particles. MOFs are a relatively new class of materials that have been implicated in a number of gas storage and delivery applications. We have 3D printed objects with our polymer-MOF composite materials and have evaluated the dynamics with which they adsorb and desorb hydrogen and nitrogen. We have found that chemical interactions between the MOF and the polymer can help to support or diminish the capacity to effectively store gas. Our work in both of these areas has shown how additive manufacturing processes can help to further technological goals while delineating the work that remains to successfully incorporate 3D printing objects into commercial devices.