![]() The proposed team has the skills necessary to design, fabricate, test, and use the TEM MEMS-based testing stage, for the study of materials response under mechanical load, and of fracture and fatigue of nanostructures having zero to a few atomic-scale defects. We propose (i) to develop and fabricate this new instrumentation (ii) to develop robust methods for configuring nanowires and nanotubes onto testing platforms (iii) to perform preliminary experimental measurements of the mechanics of nanostructures to verify system performance, and (iv) to interact with experts in multiscale theory and modeling that combines electronic structure, molecular mechanics and continuum mechanics calculations, who have an intense interest in the proposed instrument and the measurements it can perform. This instrument will allow study of material systems that are of fundamental interest due to their novel structure, and of practical importance due to their electrical, thermal, and mechanical properties. The hardware of the proposed instrument consists of five components: a compliant transmission mechanism, a motion actuator, a MEMS specimen holder (coupon), a TEM holder, and a position control system. A novel TEM MEMS-based mechanical loading stage with sub-Angstrom-level resolution is proposed. However, mechanical failure in nanostructures is qualitatively and quantitatively distinct from the failure behavior of bulk materials, thus providing a tremendous opportunity to connect the 'real' to the 'ideal' Recent developments in the synthesis, characterization, and modeling of nanostructures warrant the development of an instrument that will operate in conjunction with high-resolution transmission electron microscopy, and will enable a comprehensive study of fracture in, e.g., semiconductor and insulator nanowires, and single walled carbon nanotubes. The ultimate cohesive strength of an ideal, defect-free crystalline solid has long been an interesting theoretical abstraction: 'real' materials never exhibit their ideal strengths due to ever-present defects. OFFICE OF MULTIDISCIPLINARY AC, MPS DMR INSTRUMENTATION Primary Place of Performance Congressional District: Rodney Ruoff (Principal Investigator) Sponsored Research Office:. ![]() Bouldin DMR Division Of Materials Research MPS Direct For Mathematical & Physical Scien IMR: Development of a TEM Testing Stage with Atomic Position Resolution for Student Training, Education, and Research NSF Org:Ĭharles E.
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