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  • Nonmetallic Materials  (2)
  • Dynamics, dynamical systems, lattice effects  (1)
  • 1
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    Transverse acoustic phonon anomalies at intermediate wave vectors in ${\mathrm{MgV}}_{2}{\mathrm{O}}_{4}$ (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-11-08
    Description: Author(s): T. Weber, B. Roessli, C. Stock, T. Keller, K. Schmalzl, F. Bourdarot, R. Georgii, R. A. Ewings, R. S. Perry, and P. Böni Magnetic spinels (with chemical formula A X 2 O 4 , with X a 3 d transition metal ion) that also have an orbital degeneracy are Jahn-Teller active and hence possess a coupling between spin and lattice degrees of freedom. At high temperatures, MgV 2 O 4 is a cubic spinel based on V 3 + ions with a spin S = 1 and ... [Phys. Rev. B 96, 184301] Published Tue Nov 07, 2017
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
    facet.materialart.
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    Aging Effects of Environmentally-Friendly Cleaners on Adhesive Bond Integrity (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Because of the 1990 Clean Air Act Amendment many chlorinated solvents are being phased out of use in manufacturing industries. Replacement of the ODC (ozone- depleting chemicals) with less volatile, non-ozone depleting cleaners has been extensively studied over the past nine years at Thiokol Propulsion, Cordant Technologies. Many of the non-ODC cleaners contain compounds that can potentially degrade over time under conditions of high temperature, humidity and exposure to light. The chemical composition of environmentally conditioned cleaners and the subsequent effect on aluminum/amine-cured epoxy bond integrity as measured by Tapered Double Cantilever Beam were evaluated. From this study it is observed that moisture content increases for those cleaners containing polar compounds. Non-volatile residue content increases as stabilizers are depleted and the chemical compound limonene is oxidized. A change in aluminum/ amine-cured epoxy bond fracture toughness is observed as some of these cleaners age with increases in moisture and NVR content.
    Keywords: Nonmetallic Materials
    Type: MST Conference; May 22, 2000 - May 24, 2000
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Chemical Aging of Environmentally Friendly Cleaners (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: Use of cleaners in the manufacturing area demands bottles that will hold a sufficient amount of material and allow for easy and controlled dispensing by the operator without contamination or material leaching from the bottle. The manufacturing storage conditions are also a factor that may affect cleaner chemical integrity and its potential to leave a residue on the part. A variety of squeeze bottles stored in mild (72 F, 10% R.H., dark) and harsh (105 F, 50% R.H., fluorescent lighting) conditions were evaluated to determine the effect of environment and bottle exposure on ozone depleting chemicals (ODC) cleaners chemical composition. Low Density Polyethylene (LDPE) bottles were found to be quite permeable to all the cleaners evaluated in this study indicating this bottle type should not be used in the manufacturing area. Fluorinated Polyethylene (FLPE) bottles showed little cleaner loss and change in cleaner chemical composition over time suggesting these bottles would be acceptable for use. Chemical analysis indicates limonene containing cleaners show increased non-volatile residue (NVR) content with storage under harsh conditions. Some cleaners use BHT (butylated hydroxytoluene) as stabilizer and to protect against limonene oxidation. Under harsh conditions, BHT was quickly depleted resulting in higher NVR levels.
    Keywords: Nonmetallic Materials
    Type: Proceedings of The 4th Conference on Aerospace Materials, Processes, and Environmental Technology; NASA/CP-2001-210427
    Format: text
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    NASA TECHNICAL REPORTS
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