Materials Literature
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Summary Rocket sled testing at the Holloman High Speed Test Track (HHSTT) is performed to evaluate many types of weapon systems and to provide simulated flight environments. At a fraction of the cost of flight tests, sled tests provide debugging, developmental shakedown, and performance demonstration under field condi…
Operational C-17 aircrew are tasked continually with direct delivery of critical combat equipment and supplies. The Semi-Prepared Runway Operations (SPRO) testing was a joint Air Force Flight Test Center/Army Engineering Research and Development Center effort to expand airfield performance data to include a large part…
Abstract We report the electrografting of polyacrylonitrile (PAN) films onto evaporated gold, silver, and copper substrates, and onto platinum foil. The FTIR spectra of the films are virtually identical to library spectra of PAN and show no evidence of the cyclization observed by some authors. Raman spectra of the sam…
When a binary mixture is quenched into the unstable region of the phase diagram, phase separation starts by spontaneous growth of long-wavelength concentration fluctuations ("spinodal decomposition"). In the presence of surfaces, the latter provide nontrivial boundary conditions for this growth. These boundary conditi…
Fully conjugated pyrene-anthracene-based molecular rods were synthesized by the Horner-Wadsworth-Emmons reaction utilizing potassium tert-butoxide in dry THF. The synthesized rods, which have butylene groups as solubility spacers in the main chain, exhibited good solubility in polar solvents. The solutions of the synt…
Excitonic effects are observed in the optical absorption and photoluminescence of strongly confined CdS quantum dots embedded in the polymer matrix. CdS nanoparticles of different crystallite sizes have been prepared by chemical route with polymer as a host material. The CdS nanocomposite film was made up of particle…
Abstract This work reports the synthesis and characterization of diamantane‐based polyimides obtained from 4,9‐bis[4(3,4‐dicarboxyphenoxy)phenyl]diamantane dianhydride and various aromatic diamines. Interestingly, the diamantane‐based polyimides were very stable to hydrolysis. This novel polyimide exhibits a low diele…
A simple and renewable four-band platinum electrode for in situ conductivity measurement of polymers is described. A model is developed to evaluate contact resistance between the electrode and polyaniline film and calibrate the film resistances obtained by two-probe and four-probe methods. The conductivity of the film…
Abstract BACKGROUND: Biofoam composites were prepared using short sisal fibers as reinforcement and acrylated epoxidized soybean oil as matrix, aiming at replacing traditional unsaturated polyester foams in structural applications. The compressive properties of the composites were examined as a function of fiber loadi…
The operating range of a direct fired solid oxide fuel cell gas turbine (SOFC/GT) hybrid with bypass control of cathode airflow was determined using a hardware-based simulation facility designed and built by the U.S. Department of Energy, National Energy Technology Laboratory (NETL). Three methods of cathode airflow m…
We present a rigorous derivation of a real space full-potential multiple-scattering theory (FP-MST), valid both for continuum and bound states, that is free from the drawbacks that up to now have impaired its development, in particular the need to use cell shape functions and rectangular matrices. In this connection w…
The capability of the recently observed dichroic effect in angle-resolved Auger-photoelectron coincidence spectroscopy (DEAR-APECS) to disentangle individual multiplet terms has been exploited to study the lineshape of the ${M}_{3}{M}_{45}{M}_{45}$ Auger spectrum measured in coincidence with the $3{p}_{3/2}$ photoelec…
75As-nuclear magnetic resonance (NMR) on an iron-based superconductor LaFeAsO1-xFx (x=0.14) was performed under a pressure of 3GPa. Enhancement of superconducting transition temperature Tc was confirmed from the relaxation rate 1/T1; Tc goes up to 40K by applying pressure up to 3GPa. 1/T1T, which is temperature indepe…
Abstract Poly(vinyl alcohol) (PVOH) was electrospun using different methods to charge the polymer solution. A positive high voltage relative to the collecting electrode significantly increased the fiber deposition rate. Electron microscopy showed that approximately half of the increase in fiber mass was due to thicker…
The neutral complex Zn(L*)(2) and its monocationic analogue [ZnL(L*).THF](1+) have been previously reported to contain two and one monoanionic alpha-iminopyridinate((1-)) pi radical ligands, respectively [Lu, C.C.; Bill, E.; Weyhermüller, T.; Bothe, E.; Wieghardt, K. J. Am. Chem. Soc. 2008, 130, 3181-3197] (L represen…
Sonochemical degradation of anion surfactants, such as p -octylbenzene sulfonate (LAS C 8 ), p -nonylbenzene sulfonate (LAS C 9 ), and p -dodecylbenzene sulfonate (LAS C 12 ), was performed to obtain detailed information on the interfacial region of cavitation bubbles, because LASs are decomposed mainly in this region…
Abstract A series of fluoropolymer films were synthesized by reacting several bisphenol monomers with 1,3‐bis(1,1,1,3,3,3‐hexafluoro‐2‐pentafluorophenyl methoxy‐2‐propyl)benzene via a nucleophilic aromatic substitution to form polyethers. The bisphenols used included two diphenol‐substituted spirodilactams (SDL; aliph…
Abstract A series of polyurethane‐ block ‐poly(trifluoropropylmethyl)siloxane (PUFS) elastomers were prepared via a two‐step process from toluenediisocyanate (TDI), α ω ‐bis(3‐aminopropyldiethoxylsilane) poly(trifluoropropylmethyl)siloxane (APFS), and poly(tetramethylene oxide) (PTMO). The PUFS films were formed throu…
Abstract In this paper, relationships between the scattering domain parameters (size and shape) and the light‐shielding properties of thermotropic systems with fixed domains (TSFD) are established. Specific focus is given to the effect of additive type on the formation of scattering domain size. Various functional lay…
Abstract Fulleren‐Flocken : Ein Fullerenderivat mit Diacetylen‐Funktionen ordnet sich in flockenförmigen Mikropartikeln an (siehe Bild). Sowohl die Diacetylen‐ als auch die C 60 ‐Einheiten können effektiv vernetzt werden. Dabei entstehen supramolekulare Materialien, die gegen Lösungsmittel, Hitze und mechanische Belas…