PNNL

Sef Christ is a mechanical engineer who has been working at Pacific Northwest National Laboratory (PNNL) since 2010, when he was hired as a high school intern. Christ's primary interests involve pursuing additive manufacturing related research. He is currently the lead mechanical engineer for the Additive Center for Materials Engineering, located at 2400 Stevens within the Advanced Engineered Systems group. He also has a long history of providing mechanical support for many groups throughout PNNL.

• Additive manufacturing research
• CAD/CAM software
• Mechatronic system design
• Materials development for additive manufacturing application

• MS in Mechanical Engineering, Washington State University
• BS in Mechanical Engineering ,Washington State University

• “Of The Year” Award for Scientific Impact, PNNL
• Outstanding Performance Award for DVI Simulant Testing and  Reporting, Energy and Environment Directorate, PNNL
• Outstanding Performance Award for 3D Printing of Electrical Sensors, National Security Directorate, PNNL
• Federal Laboratory Consortium Excellence in Technology  Transfer Awardee for Cellphone Microscope
• Eisenhower HSI Transportation Fellowship for Graduate Studies
• Outstanding Performance Award for  Realvision Eye Display Project, National Security Directorate, PNNL

• Zachary C. Kennedy, Josef F. Christ, Michelle D. Fenn, Lirong Zhong, Wilaiwan Chouyyok, Anne M. Arnold, Adam C. Denny, Alan M. Albrecht, Joshua A. Silverstein, Rebecca L. Erikson, Jaehun Chun, Mica filled polyetherketoneketones for material extrusion 3D printing, Additive Manufacturing, Volume 49, 2022, 102492, ISSN 2214-8604, https://doi.org/10.1016/j.addma.2021.102492.
• Francesco Luzi, Michelle Fenn, Josef Christ, Zachary Kennedy, Tamas Varga, Michael S. Hughesa), and Carlos Ortiz-Marrero, Application of entropy and signal energy for ultrasound-based classification of three-dimensional printed polyetherketoneketone components, The Journal of the Acoustical Society of America 148, 292 (2020); https://doi.org/10.1121/10.0001581
• Zachary C. Kennedy, Josef F. Christ, Printing Polymer Blends Through in situ Active Mixing During Fused Filament  Fabrication, Additive Manufacturing, 2020, 101233, ISSN 2214-8604, https://doi.org/10.1016/j.addma.2020.101233.
• Z. C. Kennedy, D. E. Stephenson, J. F. Christ, T. R. Pope, B. W. Arey, C. A. Barrett, and M. G. Warner, “Enhanced anti counterfeiting measures for additive manufacturing: coupling lanthanide nanomaterial chemical signatures with blockchain  technology”, J. Mater. Chem. C, 2017, 5, 9570, DOI: 10.1039/c7tc03348f
• Evans, Kent A; Kennedy, Zachary C; Arey, Bruce W; Christ, Josef F; Schaef, Herbert T; Nune, Satish K; Erikson, Rebecca,  “Chemically Active, Porous 3D-Printed Thermoplastic Composites” LISSN: 1944-8244 , 1944-8252; DOI:  10.1021/acsami.7b17565, ACS applied materials & interfaces. , 2018, Vol.10(17), p.15112-15121
• J.F. Christ, N. Aliheidari, A. Ameli, et al. “3D printed highly elastic strain sensors of multiwalled carbon  nanotube/thermoplastic polyurethane nanocomposites” [J] Materials and Design, 13 (2017), pp. 394-401
• Cameron Hohimer, Josef Christ, Nahal Aliheidari, Changki Mo, Amir Ameli, "3D printed thermoplastic polyurethane with  isotropic material properties," Proc. SPIE 10165, Behavior and Mechanics of Multifunctional Materials and Composites  2017, 1016511 (11 April 2017); https://doi.org/10.1117/12.2259810
• Josef F. Christ, Cameron J. Hohimer, Nahal Aliheidari, Amir Ameli, Changki Mo, Petra Pötschke, "3D printing of highly  elastic strain sensors using polyurethane/multiwall carbon nanotube composites," Proc. SPIE 10168, Sensors and Smart  Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017, 101680E (12 April 2017); https://doi.org/10.1117/12.2259820
• Nahal Aliheidari, Rajasekhar Tripuraneni, Cameron Hohimer, Josef Christ, Amir Ameli, Siva Nadimpalli, "The impact of  nozzle and bed temperatures on the fracture resistance of FDM printed materials," Proc. SPIE 10165, Behavior and  Mechanics of Multifunctional Materials and Composites 2017, 1016512 (11 April 2017); https://doi.org/10.1117/12.2260105
• Christ, Josef F.; Aliheidari, Nahal; Pötschke, Petra; Ameli, Amir. 2019. "Bidirectional and Stretchable Piezoresistive Sensors  Enabled by Multimaterial 3D Printing of Carbon Nanotube/Thermoplastic Polyurethane Nanocomposites." Polymers 11, no.  1: 11.
• N. Aliheidari, J. Christ, R. Tripuraneni, S. Nadimpalli, A. Ameli, “Interlayer adhesion and fracture resistance of polymers  printed through melt extrusion additive manufacturing process”, Mater. Des. (2018), 10.1016/j.matdes.2018.07.001
• J. D. Suter, C. J. Hohimer, J. M. Fricke, J. Christ, H. Kim and A. T. Evans, "Principles of Meniscus-Based MEMS Gas or Liquid  Pressure Sensors," in Journal of Microelectromechanical Systems, vol. 22, no. 3, pp. 670-677, June 2013, doi:  10.1109/JMEMS.2013.2239258. 
• METHOD AND SYSTEM FOR THREE-DIMENSIONAL PRINTING OF CONDUCTIVE MATERIALS, USPO App# 14/949,494