Defect formation in Graphene
To understand the defect formation and evolution of graphene at elevated temperatures, the researchers at Oxford University recorded this atomic resolution movie at 700 °C. This required extreme stability for visualizing the evolution of point defects and the vacancy defect can be seen growing from the tip of the adatom cluster, which re-configures into the characteristic zigzag line defect structure. As graphene is a single layer of carbon atoms, any amorphous contamination on top of graphene will decrease the contrast for imaging individual carbon atoms, therefore, heating is needed to remove contamination.
- Wildfire S3 on a JEOL ARM
- Atomic resolution at elevated temperature
- Extreme specimen stability
Alex W. Robertson, et. al.
University of Oxford, United Kingdom
Thermal processing of Metal Alloys
To assist industry in identifying how the annealing process controls the structure of Al alloy, the researchers at Hunan University investigated the precipitation of Al alloy seen in this 8 hour video at 200 °C. The precipitates become visible after 1 hour indicating nucleation is complete and further growth of the precipitates interact with the dislocations. This interaction resulted in the improvement and hardness of the material, highlighting the value of in situ heating TEM enabling researchers to investigate and understand the process-structure-property relationship in one go!
- Wildfire D6 on a FEI Titan
- Industry annealing profile
- No thermal drift / no human interference
Prof. Dr. Jianghua Chen & Chunhui Liu
College of Materials Science & Engineering
Hunan University, China
Replacing the copper grid sample carriers!
Our range of Nano-Chips (MEMS devices) are functional sample carriers that replace traditional Cu grids. Based on Micro-Electro-Mechanical Systems (MEMS), they offer the unique ability to expand your application space and experiments by controlling the environment locally on the Nano-Chip. Each Nano-Chip creates a micro-scale laboratory environment within your TEM, and due to its very low mass and minimal power consumption are extremely reliable and responsive.
Best Paper Award at M&M2016
Dr. Li He and Prof. Paul Voyles | University of Wisconsin-Madison
Congratulations to Dr. Li He and Prof. Paul Voyles from the University of Wisconsin-Madison for winning the Best Paper Award at this years M&M Conference in Columbus, Ohio.
As a user of our Wildfire Heating System, we thank them for the inclusion in their paper. “… we used a MEMS “micro-hotplate” single-tilt heating holder from DENSsolutions. The manufacturer’s quoted temperature accuracy is better than 5%, and the internal consistency of our results suggest that it is much better. Temperature stability was better than 0.03°C, measured by the integrated Pt resistance temperature sensor on the heating chip. Sample drift was ~0.2 nm/min at 350°C … “
Electron Correlation Microscopy: A New Technique for Studying Local Atom Dynamics Applied to a Supercooled Liquid
Li He1, Pei Zhang1, Matthew F. Besser2, Matthew Joseph Kramer2 & Paul M. Voyles1
1 Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, USA
2 Ames Laboratory, Department of Materials Science and Engineering, Iowa State University, Ames, USA