Physical Science Speakers

Sophie Cazoette 


Sub-surface microstructural evolution during Rolling Contact Fatigue of bearing steels 


The presentation will focus on the contribution of electron microscopy to the understanding of deformation and subsurface cracking mechanisms in martensitic bearing rings. Multi scale characterization were made using SEM, TEM, FIB imaging, and lead to new understanding on the crack initiation and propagation process. 

Kerstin Volz


Quantification of Potential Drops Across Semiconductor Heterointerfaces Using 4D-STEM: prospects and pitfalls 


Spatially resolved, nano-to-micrometer-scale characterization of electric fields at materials interfaces is necessary for most electronic devices. We use the center-of-mass shift of the diffraction in a 4D STEM approach to quantify these fields in various semiconductor heterojunctions. The presentation will detail the optimization of the procedure and point out pitfalls and prospects of the technique.

Ruth Knibbe


Understanding and developing electrochemical energy systems


Uncover insights into sodium-based batteries, revealing metal formation and epitaxial deposition of Na on Zn substrates.

Marc Willinger 


Nanoparticles and Catalysts


The function of catalysts operating under non-equilibrium conditions cannot be studied ex-situ. Reaction induced structural and chemical dynamics are linked to catalytic function and involve processes at different time- and length-scale. Multi-scale operando electron microscopy provides insights into coupled oscillatory behavior, phase cooperation and the role of active interfaces. 

 Joe Patterson 


Probing the structure and dynamics of active molecular materials with cryo and liquid EM


Active molecular materials are in a constant state of disequilibrium,
but what are the structure and dynamics of these materials? Here, we show liquid and cryo EM data from chemically and electrochemically active materials under dissipative self-assembly conditions. 

David McNamara


Geological Materials and Bio-mineral systems


Diverse geological solutions, from geothermal to CO2 storage, are pivotal for achieving Net Zero. Understanding mineral nucleation and growth processes in these systems is crucial for their long-term success. Advanced microanalytical techniques can reveal insights into these processes, helping to plan improved sustainable use Net Zero geological systems.

Maria Varela De


In-situ investigation of point defects in materials for spintronics using advanced electron probes. 



Rik Brydson


Studying the crystallization of inorganic materials using correlated transmission electron microscopy by Brydson et al


A cautionary tale: the inorganic crystallization pathway observed using transmission electron microscopy
depends very sensitively on the sample preparation technique and/or in-situ method employed.

Sophie Meuret 


Exploring the dynamics of semiconductors with an ultrafast transmission electron


The development of time-resolved Cathodoluminescence (TR-CL) in a scanning electron microscope has enabled the measurement of the lifetime of excited states in semiconductors with a sub-wavelength spatial resolution [1]–[3]. While TRCL is usually done in a scanning electron microscope, the improvement of the spatial resolution and the combination with other electron-based spectroscopies offered by transmission electron microscopes has been a step forward for TR-CL [4], [5]. Our TRCL experiment are performed in a unique electron microscope, based on a cold-FEG electron gun [6]. This technology allows among other things to reach a spatial resolution of a few nanometers, essential for the study of III-V heterostructures.
In this presentation, for example, we will discuss the advantage and inconvenient of TRCL in a UTEM and present our results on the study of charge carrier dynamics in a 4 nm In0.3Ga0.7N/GaN quantum well. We studied the QW emission dynamic both along and across the quantum well and correlate the results with strain map and high resolution HADF images.



Pushing the limits of Coupled Extreme Environments during In-situ TEM


What is the physical limits for coupled in-situ experiments within a transmission electron microscope? The Tennessee Ion Beam Materials Laboratory is creating a new facility to test some of these limits by coupling ion irradiation, ion beam implantation, laser heating, gas injection, and other extreme environmental conditions.