Are you interested in giving a talk about a recent paper or an exciting result? or would you like to propose a speaker for a topic that you feel is relevant and interesting? Then submit your proposal via the registration form and we will take care of arrenging all the logistics and announcing the seminar within our community.
Date |
Speaker |
Title |
|---|---|---|
March, 15 16:00 |
Guido Stam (Leiden University, The Netherlands) |
Growing visible-light photocathodes with pulsed laser deposition characterized by Low Energy Electron Microscopy |
March, 15 16:30 |
Ingeborg Schreur (Eindhoven University of Technology, The Netherlands) |
Diving inside the world around SEM |
April, 19 16:00 |
M. A. van (Marijn) Huis (Utrecht University) |
Advances in Liquid Phase Electron Microscopy: Imaging Strategies for Soft Materials and Controlled Motion of Nanoparticles |
May, 17 16:00 |
tba |
tba |
Jun, 21 16:00 |
tba |
tba |
The beautiful Si<111> surface is the starting point of many researchers' career. In this presentation I will show the start of our plan to grow a visible light photocathode K2CsSb. The starting point is characterizing the growth of antimony on silicon(111). I will show the different reconstructions of antimony on the Si 7x7 reconstructed surface characterized with the low energy electron microscope in real space (LEEM) and in diffraction (LEED).
In this presentation from the Center for Multiscale Electron Microscopy in Eindhoven I will give a short overview of techniques we use in combination with a conventional scanning electron microscope. I will present some of the results we obtained with the Focused Ion Beam: cross section and 3D imaging. I will also show some videos how we performed mechanical measurements inside the SEM chamber using micromanipulators and a nano-indentation sensor.
In-situ cells developed for the transmission electron microscope (TEM) allow performing experiments on nanoscale materials in liquids and gases, even while heating or under application of electric fields, while imaging them at near-atomic resolution. Of these two, in particular liquid cell TEM (LC-TEM) imaging is particularly sensitive to e-beam effects. In this seminar I will discuss recent progress made at Utrecht University in the imaging of induced transitions. The first model system is p-NIPAM, a thermoresponsive biocompatible polymer that reversibly compresses when heated from room temperature to a temperature of 40 °C and vice versa. When immersed in water and thus swollen, the density of p-NIPAM is almost the same as that of water, while it is extremely sensitive to e-beam irradiation. Eventually a suitable approach was found and the thermoresponsive response was successfully imaged. The second model system is a ‘rattle particle’ consisting of a mobile core particle inside a larger silica shell where the porous shells are filled with liquid. Depending on the salt concentration in the liquid, the potentials between the core and shell could be adapted to confine the core particle at the center of the shell, or be adapted in such a way that the core particle could explore nearly the entire volume of the spherical cavity. Finally, preliminary results on the application of an AC electric field on the rattles show that the direction of the motion of the cores, either parallel or orthogonal to the field, could be controlled depending on the frequency of the applied field.