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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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In addition to its annual lectures, ChBE hosts a weekly seminar throughout the year with invited lecturers who are prominent in their fields. Unless otherwise noted, all seminars are held on Wednesdays in the Molecular Science and Engineering Building ("M" Building) in G011 (Cherry Logan Emerson Lecture Theater) at 4:00 p.m. Refreshments are served at 3:30 p.m. in the Emerson-Lewis Reception Salon.
Please visit http://chbe.gatech.edu/seminars to view seminar abstract.
January 11
Dr. Frances M. Ross
Manager, Nanoscale Materials Analysis Department
IBM's Watson Research Center
Vapour and Liquid Phase Crystal Growth In Situ in the Transmission Electron Microscope
Abstract
In situ transmission electron microscopy is a unique tool for visualizing and quantifying
crystal growth. Processes such as physical vapour deposition, chemical vapour
deposition and electrochemical growth can be carried out within the microscope,
recording movies while growth takes place. From such movies we can measure kinetics,
identify transient structures, and determine mechanisms. Here we will describe growth
in two materials systems that illustrate the opportunities and challenges of the
technique. In the vapour phase, we relate self-assembly of semiconductor
nanostructures such as quantum dots and nanowires to strain, defect formation and
step flow. In the liquid phase we describe electrochemical deposition of copper or zinc
to form nuclei, thin films or dendrites, showing how the growth of individual structures
as a function of electrochemical parameters allows diffusion processes to be
characterized. The variety of materials and processes that can be examined suggest that
in situ transmission electron microscopy of crystal growth can play a key role in
developing future nanomaterials for areas as diverse as energy storage, microelectronics
and photovoltaics.
