Acquisition of Instrumentation for the High Resolution Study of Polymer Interfaces
Final rept. 8 Mar 1999-30 Sep 2000
STEVENS INST OF TECH HOBOKEN NJ
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This grant provided funding to making a number of instrumentation upgrades to a 200 keV field-emission Scanning Transmission Electron Microscope STEMTEM at Stevens. This microscope is the centerpiece tool in an ongoing effort supported principally by the Army Research Office to develop and apply novel methods for studying nano and mesoscale structure in both synthetic and natural polymer-based materials using methods of electron energy-loss spectroscopy EELS. These DURIP-funded enhancements include 1 a new ccd-based EELS detector Stevens has the second of these worldwide 2 enhanced beam scanning coils 3 an upgraded microscope control and data acquisition system 4 a light-element X-ray detector and 5 a picoammeter Together with funds for cryogenic TEM specimen preparation and manipulation, these enhancements have enabled the Stevens group to assume a world leadership position in the study of beam-sensitive materials structure at sub-20 nm spatial resolution in both dry and frozen-hydrated materials. Among its achievements, the modified tool has been able to map nanoscale water pockets in amphilic polymers at 15 nm resolution. Work is ongoing to study a range of weakly-scattering polymer-based systems using spatially-resolved energy-loss spectroscopy.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy