Zhaslan Baraissov

TL;DR: Liquid TEM is used to follow the entire galvanic replacement of Ag nanocubes, finding experimental evidence that the Kirkendall effect is a key intermediate stage during hollowing, and providing insights into the structural transformations as a function of Au ion concentration, oxidation state of Au, and temperature.

TL;DR: In situ growth monitoring with atomic resolution and at the technological-relavant growth rates is shown to be a powerful tool for the fine-tuning of material properties at the nanoscale.

TL;DR: In this paper, the authors tracked gold nanoparticles moving in water at the liquid-solid interface with in situ TEM at rates of 100 frames per second, and the recorded motion exhibited three key features: (1) sustained sequences of sticky motion where NPs only moved a few nanometers each time; (2) sporadic long "flights" where the NPs traveled tens to hundreds of nanometers between frames; and (3) “flights” are accompanied by intermittent, fast pivoted rotations.

TL;DR: In situ transmission electron microscopy is used to provide new insights into the Kirkendall effect and void motion in core-shell nanoparticles of Au and Pd and illustrate how void behavior in bimetallic NPs can differ from an idealized picture based on atomic fluxes and have important implications for the design of these materials for high-temperature applications.