The CoWork webinar series is dedicated to the exploitation of the coherence properties of X-rays for advanced materials characterization, with a special focus on inverse microscopy techniques, such as Coherent Diffraction Imaging (CDI), Ptychography and Holography. It is an introduction to Coherent X-ray imaging methods to facilitate the access to advanced microscopy techniques to new users and it welcomes all researchers intrigued by the spectacular coherence properties of X-rays produced at modern synchrotron sources – of which MAX IV is a first example.
When: Thursday November 19, 14.00 - 15.00
Speaker: Alex Björling, Max IV Laboratory, Sweden
Title: Three-dimensional coherent Bragg imaging of rotating nanoparticles
Zoom link/registration (Register in advance for this meeting): https://lu-se.zoom.us/meeting/register/u5EpfuygpjgoHtBzMqdAX4KEJWrFG5b1LX8s
After registering, you will receive a confirmation email containing information about joining the meeting.
Bio:
Alex is one of the beamline scientists at NanoMAX, the coherent nanoprobe instrument at MAX IV. He got his PhD in biophysics from the University of Gothenburg in 2015, for work on time-resolved solution X-ray scattering and protein dynamics. He has been at MAX IV since 2016, working on the commissioning and development of the beamline, data analysis, as well as on establishing its user programme. Today his main interests are in Bragg CDI and in exploiting high coherent flux densities for understanding, among other things, surface chemistry and catalysis.
Abstract:
In recent years, Bragg CDI has been successfully applied to a number of catalytic nanoparticle-based systems, indirectly mapping out surface reactivity through adsorption-induced strain. While this development is promising for the detailed understanding of catalysts beyond simple model systems, there has been a wide gap between what is measured (hundreds of nanometers) and what is used in industrial applications (of order 10 nm). High-brilliance sources have the potential to close this gap. However, the well-known rotational sample instability problem is bound to get worse as particle sizes decrease. In a recent paper, we observed and filmed nanoparticle rotations as uncontrolled rocking curves, and learned that coherent diffraction volumes can be re-assembled from this kind of dynamic data. In this webinar, I will explain the method and discuss how it might be applied.
Webinar moderators
Members of the organising group.
Please contact either gerardina.carbone@maxiv.lu.se or asa.grunning@linxs.lu.se for any questions.