Center for Functional Nanomaterials Seminar

In four-dimensional (4D) electron microscopy, timed-pulse electron imaging and selected area diffraction are used to study structural dynamics with space- and time-resolutions that allow direct observation of transformations affecting the fundamental properties of materials. Only recently have 4D electron microscopy studies begun to reveal a variety of dynamic responses of nanoscale specimens to material excitation, on ultrafast time scales and up to microseconds. In this talk, I will highlight the development of 4D electron microscopy and the applications to various materials (e.g., gold, graphite, silicon, iron, nitinol, nickel), by using imaging and diffraction techniques. A range of phenomena (including atomic motions, morphology changes, acoustic resonances, phase transformations, mechanical motions, and magnetic domain dynamics) will be discussed. 4D electron microscopy has the potential for exploration in areas of materials science, physics, and chemistry.