Abstract
Abstract : This grant provided funding to making a number of instrumentation upgrades to a 200 keV field-emission Scanning Transmission Electron Microscope (STEM/TEM) 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
