Dissertation/Thesis Abstract

Nanoscale imaging and analysis of fully hydrated materials
by Jungjohann, Katherine Leigh, Ph.D., University of California, Davis, 2012, 185; 3511989
Abstract (Summary)

The study of nanomaterials in a liquid environment can provide insight to processes and dynamics with applications to energy storage materials, catalysis, nanomaterial growth and biological structures. For these applications we have developed techniques for the use of a dedicated in situ fluid holder in combination with aberration corrected scanning transmission electron microscopy (STEM) and dynamic transmission electron microscopy for imaging nanomaterials at atomic-scale resolution within a fluid layer. The abilities of the in situ fluid holder for STEM have been tested by comparing the SiN window thicknesses to optimize imaging conditions and the use electron energy loss spectroscopy to accurately measure the fluid path length within the cell and provide chemical analysis. The imaging artifacts caused by the high energy scanning electron beam have been investigated to determine the causes of bubbling, contamination and charging within the fluid cell for strategies to mitigate these effects. The use of the DTEM has demonstrated the growth of lead sulfide nanoparticles from a precursor solution by the sample drive laser separate from the imaging electrons. These techniques present the ideal platform for future studies of biological structures and dynamics at physiological conditions under low dose imaging with high temporal and spatial resolution.

Indexing (document details)
Advisor: Browning, Nigel D.
Commitee: Arslan, Ilke, Browning, Nigel D., Takamura, Yayoi
School: University of California, Davis
Department: Materials Science and Engineering
School Location: United States -- California
Source: DAI-B 73/10(E), Dissertation Abstracts International
Subjects: Materials science
Keywords: Eels, Fluid cells, Hydrated materials, Liquid cells, Nanomaterials, Stem, Tem
Publication Number: 3511989
ISBN: 978-1-267-40257-8
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