Argonne National Laboratory

Science Highlights

Date Postedsort ascending
Schematic of nanoreactor together with atomic model of Ag-AgCl interface
Visualizing Redox Dynamics of a Single Ag/AgCl Heterogeneous Nanocatalyst at Atomic Resolution

Argonne scientists have used in situ TEM experiments to image the reduction and oxidation of Ag/AgCl nanocatalyst particles in real time and use these experiments, combined with theory, to understand the details of the processes at the atomic scale.

July 14, 2016
Magnetic induction map of nanoscale skyrmion lattice in Ni2MnGa
Imaging Nanoscale Skyrmions in a Non-chiral Multiferroic Material

Argonne researchers have carried out real-space observations of chiral spin structures (skyrmions) in a ferromagnetic and ferroelastic material at room temperature. The skyrmions exist in the absence of chiral interactions and of an external magnetic field.

July 13, 2016
Schematic of the mechanical annealing process of P(VDF-TrFE) thin film by a nanoscale tip.
Piezoelectrically enhanced ferroelectric polymers via nanoscale mechanical annealing

Argonne researchers have developed a nanoscale mechanical annealing process of polymer ferroelectric thin films to control its properties and molecular orientation.

May 13, 2015
Fluorescence maps and ptychographic image of a frozen-hydrated chlamydomonas reinhardtii algea obtained from raster scan data. (Left) Elemental dis- tributions of P, S, K, and Ca within the cell. (Right) Phase image reconstructed via ptychography.
Simultaneous cryo x-ray ptychographic and fluorescence microscopy of green algae

Argonne researchers demonstrate for the first time the combination of fluorescence and ptychography for imaging frozen-hydrated specimens at cryogenic temperatures, with excellent structural and chemical preservation.

May 4, 2015
Overlaid elemental maps of manganese, iron, and zinc of arabidopsis thaliana seed.
Hyperspectral image reconstruction for X-ray fluorescence tomography

A penalized maximum-likelihood estimation is proposed to perform hyperspectral (spatio-spectral) image reconstruction for X-ray fluorescence tomography. The resulting element distribution estimates with the proposed approach show significantly better reconstruction quality than the conventional analytical inversion approaches, and allows for a high data compression factor which can reduce data acquisition times remarkably.

April 15, 2015
3D vector field plots comparing the reconstructed magnetization in the nanowire for different reconstruction methods.
Iterative reconstruction of magnetic induction using Lorentz transmission electron tomography

Argonne researchers presented a formalism to represent electron-optical magnetic phase shift as a Radon transform of the 3D magnetic induction of the nano-object, and improved tomographic reconstruction methods for vectorial data reconstruction.

March 11, 2015
High-speed Visualization of Polarization Charges using a Nanoscale Probe

A new scanning probe microscopy technique, charge gradient microscopy, is being used to study the complex dynamics of polar domain nucleation and growth.

February 4, 2015
Imaging exotic properties of nanoscale magnetic lattices

Real space observation of magnetic monopole defects and Dirac string defects in nanoscale magnetic lattices.

December 18, 2014
Magnetic Structure of 3D Sculpted Cobalt Nanoparticles

Argonne researchers have gained a fundamental understanding of interactions between nanoscale building blocks that control the properties of the mesoscopic system.

December 18, 2014
Seeing Gold Nanoparticles Self-Assemble with in situ Liquid Transmission Electron Microscopy

The self-assembly of gold nanoparticles coated with specific organic ions in water was observed in situ for the first time by transmission electron microscopy (TEM) using a liquid cell, as it occurs in real time. The gold nanoparticles formed one-dimensional chains within a few minutes.

December 15, 2014