Materials Literature
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The role of water in lipid oxidation is examined. The water activity of a system influences lipid oxidation rates. At both very high and very low water activities, lipid oxidation rates are high compared to the rate at intermediate water activities. Glass transition theory may also be used to understand lipid oxidatio…
Abstract Poly(dimethylsiloxane) elastomers that had been filled with in situ precipitated silica were studied by thermogravimetric analysis, under nitrogen and in air. Both types of measurements indicated that the filler raises the temperature of thermooxidative degradation of the polymer, possibly by inactivating the…
Abstract A procedure is described for preparing fairly uniform spheres of three different nylon polymers by phase separation. The mean diameter and polydisperse index were 5 μm and 1.056 for Griltex nylon, 5.7 μm and 1.046 for nylon 6/6, and 12.9 μm and 1.016 for nylon 6. The phase separation is done by taking a 1 wt…
Abstract Chemical structures of cellulose and chitosan dissolved in trifluoroacetic acid (TFA) and those of cellulose and chitosan films cast from their TFA solutions were studied by 13 C‐NMR and infrared (IR) spectroscopy. Cellulose is trifluoroacetylated selectively at the C6–hydroxyl groups in the TFA solution, and…
Abstract Blend membrane consisting of poly(vinyl alcohol) (PVA) and chitosan was prepared from a solvent‐casting technique and characterized for their intermolecular interactions using infrared and X‐ray diffraction methods. Cross‐linking the blend with glutaraldehyde produces a membrane with lower crystallinity and a…
<div class="htmlview paragraph">Nickel and silver-metal hydride batteries are being developed for aerospace applications by Eagle-Picher. Metal hydride batteries offer a number of advantages over other aerospace battery systems. Nickel-metal hydride batteries have twice the gravimetric energy density of nickel-c…
Using the density-functional theory, norm-conserving pseudopotentials and plane-wave expansions the authors have calculated ab initio the equation of state and the principal phonon modes in boron phosphide, including their pressure dependence and the amplitude of the eigendisplacements. Good agreement with experiment…
The concentration profiles of carboxy-terminated polystyrene chains in the melt grafted onto oxide-covered silicon substrates were measured using secondary-ion mass spectroscopy. The grafting density increased with temperature and an enthalpy of +7.4 kcal/mole was deduced for the grafting reaction, SiOH+R(COOH)\ensure…
<div class="htmlview paragraph">A long-term thermal energy storage system has been implemented at the University of Utrecht campus in the Netherlands. The project will extend co-generation operation into the summer beyond heat demand periods, resulting in increased electricity generation. The stored heat (90 °C)…
We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on the layered compound 1-T-${\mathrm{TiTe}}_{2}$, whose low-energy properties are those of a normal metal, and analyzed the experimental line shapes in terms of the Fermi-liquid self-energy. We find excellent agreement between the mea…
Magnetization measurements at ambient pressure on \ensuremath{\kappa}-(ET${)}_{2}$Cu[N(CN${)}_{2}$]Cl, an organic salt that is superconducting under pressure (${\mathit{T}}_{\mathit{c}}$=12.8 K at 0.3 kbar), reveal an antiferromagnetic transition near 45 K and, for the first time in this class of materials, a transiti…
We report on micro-Raman spectroscopy studies of porous silicon which show an amorphous silicon Raman line at 480 R cm−1 from regions that emit visible photoluminescence. A Raman line corresponding to microcrystalline silicon at 510 R cm−1 is also observed. X-ray photoelectron spectroscopy data is presented which show…
Light scattering and precision calorimetry show that the nematic ordering of octylcyanobiphenyl (8CB) filling the connected network of pores of a silica aerogel does not occur via the first-order phase transition characteristic of the bulk. Rather, ordering is continuous with an orientational correlation length never…
Moriya's expression for the ringle-bond anisotropic superexchange interaction is shown to possess an overlooked hidden symmetry, isomorphic to the symmetry of the isotropic case. For the unfrustrated case, this symmetry results in a degeneracy of the macroscopic state, implying no unique value for the Dzyaloshinsky we…
Surface segregation of In atoms during molecular beam epitaxy (MBE) and its influence on the energy levels in InGaAs/GaAs quantum wells (QWs) were systematically studied using secondary-ion mass spectroscopy (SIMS) and photoluminescence (PL). Strong dependence of In surface segregation on the growth conditions was fou…
Increased molecular weight and branching agents are used in melt spinning partially oriented nylon 66. The fiber solidifies more rapidly during spinning and has larger crystallites and increased elongation-to-break versus conventional PON, consistent with a stress-induced crystallization mechanism. When textured, the…
Lead scandium tantalate (PST) ceramic has been shown [1,2] to be a ferroelectric material with the perovskite Pb(B1B2)O3 structure, and having a first order phase transition at 25–30°C. The material has a reversible pyroelectric effect under bias, and it has been fully assessed for thermal detector applications [3]. M…
Abstract Einkristalle von Cu 6 La 4 Mo 9 O 36 wurden synthetisiert und röntgenographisch untersucht. Es kristallisiert trigonal, Raumgruppe R3c — C ; a = 20,892, c = 12,754 Å; Z = 6. Cu 6 La 4 Mo 9 O 36 repräsentiert einen neuen Strukturtyp mit isolierten MoO 4 ‐Tetraedern und dreifach überkappten trigonalen Prismen u…
The importance of D-3He reactor development in the attainment of attractive fusion energy is discussed. In addition to D-3He plasma physics and confinement issues, the use of low-activation wall materials and commercial production of 3He are vital issues for the successful achievement of a D-3He energy economy. These…
Corrosion behavior of SUS-304L SS, which is used as a typical material for reactor structures has been studied under the steam containing CsOH at temperatures of 450~750°C. The steam was supplied by heating the aqueous solution of CsOH with concentrations 0~320 mM at 110°C. The mass gain by oxygen uptake increases par…