Investigation of time dependent water droplet dynamics on porous fuel cell material via synchrotron based X-ray imaging technique

2018 ◽  
Vol 97 ◽  
pp. 237-245 ◽  
Author(s):  
Paria Rahimian ◽  
Logan Battrell ◽  
Ryan Anderson ◽  
Ning Zhu ◽  
Erick Johnson ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Water Droplet ◽  
Imaging Technique ◽  
Time Dependent ◽  
Droplet Dynamics ◽  
X Ray ◽  
Cell Material ◽  
X Ray Imaging

Investigation of Water Distribution in a Polymer Electrolyte Fuel Cell Using X-Ray Imaging Technique

2009 ◽  
Author(s):  
Seung-Gon Kim ◽  
Sang-Joon Lee
Keyword(s):  
Water Management ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Water Distribution ◽  
Imaging Technique ◽  
Gas Diffusion ◽  
Polymer Electrolyte Fuel Cell ◽  
Gray Level ◽  
X Ray ◽  
X Ray Imaging

Water management in a polymer electrolyte fuel cell (PEFC) was experimentally investigated using an X-ray microscopy technique. Recently, fuel cell has been receiving large attention as an important renewable energy due to its efficiency, clearness and sustainability. Among various types of fuel cells, PEFC can be used as a power source of transport vehicles and home applications. In recent commercial development of PEFC, water management is one of the major problems to be solved. In fact, proper water management is vital to enhance performance and durability of PEFC. In this study, transport of water inside MEA (membrane electrode assembly) and GDL (gas diffusion layer) layers of an operating (in situ) fuel cell was observed using the synchrotron X-ray micro-imaging technique. As the synchrotron X-ray imaging technique has very high spatial and temporal resolutions, it is suitable for observing the dynamic movement and behavior of liquid layer and water distribution inside the PEFC. For this X-ray micro-imaging experiment, a single cell test kit of PEFC was specially designed for convenient capturing of X-ray images. Temporal variation of gray level in the PEFC components, such as MEA, GDL and endplate, was investigated with varying loading condition. As a result, X-ray images of the PEFC components were clearly distinguished by image pattern and gray level difference. The gray level shows roughly symmetric distribution with respect to MEA layer. The gray level at GDL decreases with lapse of time, indicating the increase of H2O concentration with time.

Defects of Platelet Function Recognized by X-Ray Imaging and Scanning Electron Microscopy

1985 ◽  
Vol 43 ◽  
pp. 610-613
Author(s):  
M.G. Baldini ◽  
S. Morinaga ◽  
D. Minasian ◽  
R. Feder ◽  
D. Sayre ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Biology ◽  
Imaging Technique ◽  
Human Platelets ◽  
X Rays ◽  
X Ray ◽  
X Ray Imaging ◽  
Complex Phenomena ◽  
Scanning Electron

Contact X-ray imaging is presently developing as an important imaging technique in cell biology. Our recent studies on human platelets have demonstrated that the cytoskeleton of these cells contains photondense structures which can preferentially be imaged by soft X-ray imaging. Our present research has dealt with platelet activation, i.e., the complex phenomena which precede platelet appregation and are associated with profound changes in platelet cytoskeleton. Human platelets suspended in plasma were used. Whole cell mounts were fixed and dehydrated, then exposed to a stationary source of soft X-rays as previously described. Developed replicas and respective grids were studied by scanning electron microscopy (SEM).

X-ray imaging with ultra-small-angle X-ray scattering as a contrast mechanism

2004 ◽  
Vol 37 (5) ◽  
pp. 757-765 ◽  
Author(s):  
L. E. Levine ◽  
G. G. Long
Keyword(s):  
Small Angle ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Sample Volume ◽  
Contrast Imaging ◽  
X Ray ◽  
X Ray Scattering ◽  
X Ray Imaging ◽  
Contrast Mechanism ◽  
Ray Scattering

A new transmission X-ray imaging technique using ultra-small-angle X-ray scattering (USAXS) as a contrast mechanism is described. USAXS imaging can sometimes provide contrast in cases where radiography and phase-contrast imaging are unsuccessful. Images produced at different scattering vectors highlight different microstructural features within the same sample volume. When used in conjunction with USAXS scans, USAXS imaging provides substantial quantitative and qualitative three-dimensional information on the sizes, shapes and spatial arrangements of the scattering objects. The imaging technique is demonstrated on metal and biological samples.

Application of Synchrotron Radiation X-ray to Research of Fuel Cell Material

2011 ◽  
Vol 48 (6) ◽  
pp. 403-411 ◽  
Author(s):  
Tohru Yamamoto ◽  
Yoshihisa Tochihara ◽  
Naoki Noda ◽  
Hiroyuki Akiho
Keyword(s):  
Fuel Cell ◽  
Synchrotron Radiation ◽  
X Ray ◽  
Cell Material

Direct Visualization of the Behavior and Shapes of the Nanoscale Menisci of an Evaporating Water Droplet on a Hydrophilic Nanotextured Surface via High-Resolution Synchrotron X-ray Imaging

Langmuir ◽  
2019 ◽  
Vol 35 (19) ◽  
pp. 6460-6467
Author(s):  
Dong In Yu ◽  
Seungwoo Doh ◽  
Ho Jae Kwak ◽  
Jiwoo Hong ◽  
Narayan Pandurang Sapkal ◽  
...  
Keyword(s):  
High Resolution ◽  
Water Droplet ◽  
Direct Visualization ◽  
X Ray ◽  
X Ray Imaging
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