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Author: david jacobson
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1. Neutron Tomography of a Fuel Cell: Statistical Learning Implementation of a Penalized Likelihood
Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Daniel S Hussey, David L Jacobson
At the NIST Neutron Imaging Facility, we collect neutron projection data for both the dry and wet
states of a Proton-Exchange-Membrane (PEM) fuel cell. Transmitted neutrons captured in a
scintillator doped with Lithium-6 produce scintillation li ...
2. Improving quantitative neutron radiography through image restoration
Daniel S Hussey, Elias M Baltic, Kevin J Coakley, David L Jacobson
This in-situ study examines the water content in polymer electrolyte fuel cells (PEFCs) using neutron radiography. Various conditions such as different polytetraflouroethylene (PTFE) loadings in the gas diffusion media including the micro-porous laye ...
3. Demonstration of Achromatic Cold-Neutron Microscope Utilizing Axisymmetric Focusing Mirrors.
Daniel S Hussey, D. Liu, M. V. Gubarev, D Ramsey, David L Jacobson, Muhammad Arif, D. E Moncton, B. Khaykovich
An achromatic cold-neutron microscope with magnification 4 is demonstrated. The image-forming optics is made of nested coaxial mirrors of full figures of revolution, so-called Wolter optics. The spatial resolution, field of view, and depth of focus a ...
4. High-resolution neutron radiography of through-plane liquid water distribution in polymer electrolyte
membrane and gas diffusion layer
Daniel S Hussey, David L Jacobson, Richard Fu, Ugur Pasaogullari, Takeshi Shiomi, Yuichiro Tabuchi
We re-investigate our previously studied water transport phenomena under nonisothermal conditions by measuring the through-plane liquid water distribution across PEFC components with the state-of-the-art high-resolution neutron radiography. A correc ...
5. Neutron Imaging of Lithium Concentration in Battery Pouch Cells
Daniel S Hussey, David L Jacobson, Jason B. Siegel, Anna G Stefanopoulou, Xinfan Lin, David Gorsich
This paper shows how neutron radiography can be used for in situ quantification of the lithium
concentration across battery electrodes, a critical physical system state. The change in lithium
concentration between the charged and discharged state ...
6. Changing Optical Axis Due To Reactor Operation
Daniel S Hussey, David L Jacobson, Elias M Baltic
During reactor operation, the neutron flux distribution is modified by the reactor control
mechanisms, in the case of the reactor at the National Institute of Standards and Technology, this
is determined by the angular position of the Cd shim arm ...
7. WATER TRANSPORT ACROSS A POLYMER ELECTROLYTE MEMBRANE UNDER THERMAL GRADIENTS
David L Jacobson, Richard Fu, Takeshi Shiomi, Ugur Pasaogullari, Joshua Preston, Shinichi Miyazaki, Yuichiro Tabuchi, Daniel S Hussey
A fundamental experimental and numerical study of the water transport across a perfluorosulfonic
acid (PFSA) membrane under a temperature gradient is presented. The water transport phenomenon was
experimentally investigated through water flux mea ...
8. Electrically‹stimulated gradients in water and counterion concentrations within electroactive polymer actuators
Jong Keun Park, Paul J. Jones, Chris Sahagun, Kirt Anthony Page, Daniel S Hussey, David L Jacobson, Sarah E Morgan, Robert B Moore
While ionic polymer metal composites (IPMCs) have been studied for more than 10 years, the specific actuation mechanism is still unclear. In this work, neutron imaging, applied potential (AP) and current sensing (CS) atomic force microscopy (AFM) me ...
9. Observations of Transient Flooding in a Proton Exchange Membrane Fuel Cell Using Time-Resolved Neutron Radiography
Michael A Hickner, Nathan P. Siegel, Ken S Chen, Daniel S Hussey, David L Jacobson
The generation and transport of water in both the liquid and gas phases during device operation is an important area of study to understand both steady-state and transient performance of proton exchange membrane fuel cells. Specifically, localized h ...
10. Use of Neutron Imaging for PEMFC Performance Analysis and Design
T Trabold, Jon P Owejan, Jeffrey J Gagliardo, David L Jacobson, Daniel S Hussey, Muhammad Arif
Efficient water management is one of the key design objectives for proton exchange membrane fuel cells (PEMFCs), due to the influence of water on material selection, hardware configuration, and stack operating conditions. Neutron imaging has proven t ...