The goal of this project is to develop 2D and 3D structural and elemental characterization methods for studying nanoscale features in organic and biological matrices in various environmental conditions. We combine existing microscopy and spectroscopy methods with computational approaches to improve spatial resolution and detection sensitivities. Projects include 3D characterization of nanomaterials in biological matrices, fate of nanomaterial in biological systems, nanocomposite characterization, analysis of nanoparticles in photographic printing, and compressive sensing approach for low-signal x-ray analysis.
Displayed figure shows two cross-sectional images of a Caenorhabditis elegans from a recent study. A portion of the nematode that was previously exposed to Au nanoparticles was imaged at nanoscale using focused ion beam serial sectioning. The goal of this work was to detect and identify Au nanoparticles that were trapped inside the nematode. This work was part of a larger study for developing an ICP-MS based quantification methods for nanoparticles in organisms.
Full 3D image stack of the worm can be found here.
University of Maryland
National Gallery of Art