Christopher Dirubio Email & Phone Number

Perrysburg, Ohio

Perrysburg, Ohio

- Process Integration Engineer responsible for developing novel solar module designs and manufacturing processes

Webster, Ny

• Responsible for materials and process integration for printing systems, and for supply chain modeling and analysis.

Webster, Ny

• Led 13 successful technology development teams containing 2 to 15 scientists, engineers, and technicians. Mentored junior scientists and engineers.• Optimized and demonstrated key enabling technologies for the DC8000 family of color printers that generated ~ $8 billion in revenue for Xerox.• Invented and demonstrated a very low cost closed-loop control system that reduced run cost by $2.50/1000 prints, representing a potential savings of over $25 million/year.• Developed printing technologies that, reduced image non-uniformities by a factor of 2x, reduced cross-process color non-uniformities by 5x, eliminated image deletions completely, increased color gamut, and enabled new printing applications to increase market share.• Determined the design rules, critical parameters, and system performance of key materials that increased ink jet image durability by 42x, broadened media/paper latitude, reduced volatile organic compound (VOCs) emissions by a factor of 80, and reduced toner adhesion to surfaces thereby reducing toner losses and waste by a factor of 5x.• Invented, developed, and optimized complex electromechanical systems and processes for both xerographic printing and phase-change inkjet printing technologies.• Created and/or developed dozens of new experimental techniques, devices, and fixtures to evaluate and optimize: critical materials properties, the design of key components, subsystem performance, and system-level performance.• Developed dozens of mathematical models and simulations of complex physical processes that reduced the time to develop and optimize subsystem and system-level technologies, and developed a fundamental understanding of the physical processes underlying several key failure modes observed in printing systems. • Created several novel sensing techniques and closed-loop control strategies to enable more predictable printing performance.

• Conducted experiments on the nano-scale mechanical and morphological properties of natural biocomposite materials such as normal and laser ablated human tooth enamel, mineralized and unmineralized turkey leg tendon, and collagen using both an Interfacial Force Microscope (IFM) and an Atomic Force Microscope (AFM). • Conducted surface roughness measurements with an AFM to establish optimal conditions for H2 plasma etching of GaAs. • Co-designed and built low noise closed-loop force feedback electronics for the IFM. Converted a commercially available AFM into a fully operational IFM as part of a highly successful Cooperative Research and Development Agreement (CRADA) with Digital Instruments. • Developed techniques for calibrating the self-balancing differential capacitance force sensor in the IFM.

• Conducted thesis research on energy transfer, charge transfer, and trapping in hyperthermal energy collisions of alkali ions with clean metal surfaces. • Experimentally demonstrated limitations in the trajectory approximation widely used to model ion scattering from surfaces, and published the results in a Physical Review Letter.• Used a combination of experiment and simulation to, for the first time, demonstrate trajectory dependent charge transfer in ion scattering from surfaces, and published the results in a Physical Review Letter.• Used a combination of experiment and simulation to demonstrate anomalous surface trapping due to image force interactions and corrugations in the surface scattering potential in ion scattering from surfaces, and published the results in a Physical Review Letter.• Designed, machined, and constructed a sputter ion gun for sample cleaning, including design & construction of the ion optics, mounting hardware, and control electronics.• Designed a vacuum pumping system for an Ultra-High Vacuum (UHV) chamber; and designed and constructed a vibration isolated mechanical pump foreline for connection to a scanning tunneling microscopy apparatus. • Used Auger Electron Spectroscopy, Low Energy Electron Diffraction, Residual Gas Analysis (Mass Spectroscopy), Low Energy Ion Scattering (LEIS), and other techniques in the course of conducting UHV experiments. • Wrote and implemented computer programs for data analysis, and ran computer simulations to model ion scattering. • Refined existing techniques and developed new laser-based techniques for the alignment of the sample, ion beam line, and ion detector in the low energy ion scattering apparatus.

Ph.D., Physics

Ba, Physics

Activities and Societies: Phi Beta Kappa