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Title: Investigation of Polyimide Films for NIF Target and Diagnostic Applications Final Report CRADA No. TSB-1160-95

Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States
46-Materials Science; 64-Plasma Physics and Thermonuclear Processes

Citation Formats

Powell, F, and Stone, G. Investigation of Polyimide Films for NIF Target and Diagnostic Applications Final Report CRADA No. TSB-1160-95. United States: N. p., 2018. Web. doi:10.2172/1424624.
Powell, F, & Stone, G. Investigation of Polyimide Films for NIF Target and Diagnostic Applications Final Report CRADA No. TSB-1160-95. United States. doi:10.2172/1424624.
Powell, F, and Stone, G. 2018. "Investigation of Polyimide Films for NIF Target and Diagnostic Applications Final Report CRADA No. TSB-1160-95". United States. doi:10.2172/1424624.
title = {Investigation of Polyimide Films for NIF Target and Diagnostic Applications Final Report CRADA No. TSB-1160-95},
author = {Powell, F and Stone, G},
abstractNote = {},
doi = {10.2172/1424624},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2018,
month = 1

Technical Report:

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  • The initial work on microwave annealing of dense silicon nitride showed enhanced grain growth and improved creep resistance for materials annealed at temperatures of 1,200--1500 C. In those tests, the anneal times were on the order of 10--20 h to achieve the observed changes. To further study the effectiveness of microwave annealing, a Cooperative Research and Development Agreement (CRADA) was started in the area of microwave processing of silicon nitride with Garrett Ceramic Components/Allied-Signal (GCC/AS). The original plan was for ORNL to microwave anneal specimens of dense silicon nitride with high additive contents (> 5%) provided by GCC/AS at variousmore » times and temperatures. There were to be three sample types and 3--4 annealing conditions for a total of 9--12 annealing runs. The materials would then be characterized by both ORNL and GCC/AS to determine any changes in the properties. The objectives were: (1) to determine the effects of microwave crystallization on mechanical properties, and (2) to compare the effectiveness of microwave versus conventional heating. The mechanical properties examined that were fracture toughness, flexural strength and high temperature stress rupture. Delays, organizational changes, and other commercialization priorities resulted in a termination of this CRADA. This report contains a summary of results from one silicon nitride composition.« less
  • Limiting factor to computer chip speed and size is the dielectric constant of the interlayer insulating materials, which has been reduced going from inorganic to organic type materials. A further reduction, together with better mechanical properties, is still needed. We have developed a spincoating method in conjunction with a thermodynamic process (Non-solvent Induced Phase Separation) to create microporous polyimide films with both lower dielectric constant and better stress reduction properties compared to solid films. In this method, we spincoat a soluble polyimide solution in 1, 3-dimethoxybenzene solvent onto a Si wafer, and then immediately submerse the wet polymer film intomore » a non-solvent bath, typically toluene. Phase separation of the polymer occurs on a micron size scale and the resulting microporous structure becomes locked in by the high glass transition temperature of the polyimide. Factors affecting film morphology, thickness, pore size, and % porosity include polymer concentration, spin speed, and non-solvent type. Morphology is explained in terms of thermodynamics and kinetics of phase separation and diffusion, using an idealized ternary phase diagram. One particular film having 68% porosity, 22 microns thickness, and 1.4 micron pore size had a dielectric constant of 1.88 and loss of 0.002. Stress measurements indicated that the microporous film reduced surface stress on the wafer by more than a factor of 10 compared to analogous solid polyimide film.« less
  • This was a collaborative effort between Lawrence Livermore National Security, LLC (formerly The Regents of the University of California)/Lawrence Liver more National Laboratory (LLNL) and BioTelligent, Inc. together with a Russian Institution (BioFil, Ltd.), to develop a new system ( diagnostic device, operating procedures, algorithms and software) to accurately distinguish between benign and malignant breast tissue (Breast Cancer Diagnostic System, BCDS).
  • BioLuminate, Inc. planned to develop, produce and market a revolutionary diagnostic device for early breast cancer diagnosis. The device was originally invented by NASA; and exclusively licensed to BioLuminate for commercialization. At the time of the CRADA, eighty-five percent (85%) of all biopsies in the United States were found negative each year. The number of biopsies cost the health care system $23 billio n annually. A multi-sensor probe would allow surgeons to improve breast cancer scre ening and significantly reduce the number of biopsies. BioLuminate was developing an in-vivo system for the detection of cancer using a multi-sensor needle/probe. Themore » first system would be developed for the detection of breast cancer. LLNL, in collaboration with BioLuminate worked toward a detailed concept specification for the prototype multi-sensor needle/probe suitable for breast cancer analysis. BioLuminate in collaboration with LLNL, worked to develop a new version of the needle probe that would be the same size as needles commonly used to draw blood.« less
  • The purpose of this project was to develop optical probes that would identify tissue conditions and tissue type while the tissue was being subjected to therapeutic energy delivery systems (EDSs). These systems included electrosurgical, optical and thermal sources. Feedback from the probe would be given directly to the EDS leading to "smart" instruments which would automatically adjust energy delivery parameters to obtain optimal tissue welding, coagulation, and cutting. The project was scheduled to be a three-year effort. The initial three-year project was extended another two years with a first amendment of the work statement (Appendix A of the CRADA). Amore » second and then third amendment extended the work statement two additional years.« less