Research Profiles

JP

"Q" Theme - 3 Result(s)

Q
View Details

 Q

Quantitative analysis of microstructure in nuclear materials by week-beam scanning transmission electron microscopy

 
 
 
NEXT
PREV
概要

We have developed a technique for quantitative analysis of microstructures (e.g., dislocations and irradiation defect aggregates) of activated and nuclear-burned specimens in the context of the Week Beam Scanning Transmission Electron Microscope (WB-STEM) method, which boasts extremely high measurement accuracy as a quantitative analysis method for lattice defects.
In combination with a dedicated heated sample holder with fully automated temperature measurement and current control in a cartridge-type heating furnace, changes in dislocation microstructure can be dynamically measured in-situ along with a highly reliable temperature history.

従来技術との比較

Conventional TEM methods require expertise in reciprocal space and dislocation theory, but our WB-STEM method is equipped with automatic analysis software for film thickness measurement and dislocation loop feature extraction, making it possible to analyze irradiation defects easily and precisely.

特徴・独自性
  • Since its design, the WB-STEM method has been developed for implementation and on-site repair in radiation controlled areas where nuclear materials are handled, with special aperture and diffraction disc selection equipment, control and analysis software.
  • WB-STEM accepts irradiation defect analysis of activated specimens from all over the world, including RPV monitoring specimens from European reactors and neutron-irradiated materials from US research reactors.
  • It is also used to analyze the properties of iron-containing nuclear fuel simulated debris in decommissioning projects.
実用化イメージ

We support research organizations that currently use transmission electron microscopy to observe microstructures to introduce the WB-STEM method by special modification. We will instruct researchers who have no experience using transmission electron microscopy in the procedure for dislocation analysis.

Researchers

Institute for Materials Research

Kenta Yoshida

Quantum and Molecular Dynamic Simulations of Transport Phenomena in Fuel Cell

 
 
 
NEXT
PREV
特徴・独自性
  • It is necessary to grasp nanoscale transport phenomena of materials in polymer electrolyte fuel cell to improve its performance. In our laboratory, nanoscale transport phenomena are analyzed by large scale molecular dynamics simulations using a supercomputer system. As the present theme, the dependence of the materials or structures of polymer electrolyte membrane on the ability of proton transfer(Fig. 1), the ability of proton transfer or oxygen permeability of ionomer in catalyst layer(Fig. 2), and the mechanism of transport phenomena of a water droplet in a nano pore in gas diffusion layer or micro porous layer(Fig. 3), are analyzed in detail.
実用化イメージ

These research can be applied to the analysis of flow field in devices which have nanoscale structure, for instance, fabrication process of semiconductor, friction phenomena of such nanoscale devices or next generation batteries, as well as the field of fuel cell.

Researchers

Institute of Fluid Science

Takashi Tokumasu

Quantum devices utilizing nanostructures

特徴・独自性
  • 1) We investigate quantum effects in nanostructures and develop quantum devices like quantum bits and sensors utilizing solid-state nanostructures.
  • 2) We have techniques and skills on electric measurement and control of quantum states and data informatics. We are open to new collaborations.
実用化イメージ

Researchers

Advanced Institute for Materials Research

Tomohiro Otsuka

Research Profiles

Fields

ENGLISH
Close