Materials Literature
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The temperature dependence of the local distortions in ${\mathrm{SrTiO}}_{3}$ has been studied by EXAFS spectroscopy at the titanium K edge (4982 eV). The oxygen-ion Debye-Waller factor ${\mathrm{\ensuremath{\sigma}}}_{0}^{2}$ has been determined from 4.5 to 240 K. The antiferrodistortive transition at 105 K is eviden…
We report the 470-MHz (11.7 T) 19F solution nuclear magnetic resonance (NMR) spectra of 2-, 3-, and 4-fluorophenylalanine incorporated into the egg white lysozymes (EC 3.2.1.17) of chicken, pheasant, and duck, as well as spectra of 4-fluorotryptophan incorporated into chicken, California valley quail, and Bob White qu…
NADP(+)-isocitrate dehydrogenase (NADP(+)-IDH) from the dinitrogen-fixing filamentous cyanobacterium Anabaena sp. strain PCC 7120 was purified to homogeneity. The native enzyme is composed of two identical subunits (M(r), 57,000) and cross-reacts with antibodies obtained against the previously purified NADP(+)-IDH fro…
Weaire and Phelan's recent discovery of a clathrate structure (that of β-tungsten) as an ordered minimal froth (space-filling assembly of polyhedral bubbles) with less surface per unit volume than Kelvin's b.c.c. arrangement of truncated octahedra suggests searching among other known tetrahedrally close-packed crystal…
The dynamics of spreading of miroscopic nonvolatile polymer droplets on surfaces has been studied by the molecular-dynamics method. Simulations have been performed for mixtures of solvent and dimer, solvent and tetramer, and solvent and octamer droplets. For solvent particles and dimers, the dynamical layering is char…
Abstract A review is given on comparative investigations onto the structure of regenerated cellulose fibers of the regular viscose type (modal) and of solvent spun fibers of the lyocell type, namely the NMMO fiber spun from a solution of cellulose in N–methylmorpholine N–oxide and water. It was found that in the lyoce…
Abstract Degradation of polyvinylchloride has been reexamined in the light of its DT‐DSC‐TG analytical behavior up to a temperature of 1000°C in an inert atmosphere. Four distinct stages of degradation have been identified. The first stage is almost eventless with no change in weight for untreated PVC samples. The sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Chemical Investigations of Na3(ABO4)3.cntdot.4H2O-Type Sodalite PhasesTina M. Nenoff, William T. A. Harrison, Thurman E. Gier, Nancy L. Keder, Charlotte M. Zaremba, Vojislav I. Srdanov, Jaqueline M. Nicol, and Galen D. StuckyCite this: Inorg. Chem. 1994, 33, 1…
Abstract Fourier transform (FT) Raman spectroscopy has been proved to be an adequate technique for the study of the quantitative structural changes which take place in poly(ethylene terephthalate) on annealing. The two‐phase conformational model proposed previously in the infrared domain using photoacoustic FTIR has b…
Abstract The increasing costs of disposing of fly ash create an urgent need to find potential uses, one of which is land application to improve physical or chemical properties of soils. Because fly ash contains considerable amounts of B, which is often deficient in Southeastern soils, B release from fly ash and its up…
The hybrid Bacillus (1,3-1,4)-beta-glucanase H(A16-M), consisting of 16 N-terminal amino acids derived from the mature form of the B. amyloliquefaciens enzyme and of 198 C-proximal amino acids from the B. macerans enzyme, binds a calcium ion at a site at its molecular surface remote from the active center [T. Keitel,…
Linear polymers, such as polyethylene, are thermoplastics, which can be remolded many times and have a degree of solubility, are considered. The properties discussed include: molecular structure, molecular motion, and dielectric relaxation.>
Carbon nanotubes were prepared by dc arc-discharge evaporation of graphite rods, by varying the pressure and the kind of atmospheric gas. Nanotubes, included in the carbon deposit on the cathode, were observed by scanning electron microscopy (SEM).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegmented Polyurethane Elastomers with Liquid Crystalline Hard Segments. 1. Synthesis and Phase BehaviorWeiming Tang, Richard J. Farris, William J. MacKnight, and Claus D. EisenbachCite this: Macromolecules 1994, 27, 10, 2814–2819Publication Date (Print):May 1, 1994Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and the Smectic Mesophase of Copolymers Containing a Mesogenic (Carbazolylmethylene)aniline Group as the Electron Donor and a (4'-Nitrobenzylidene)aniline Group as the Electron AcceptorYozo Kosaka, Takashi Kato, and Toshiyuki UryuCite this: Macromolecules 1994, 27,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxovanadium(V) Alkoxide Derivatives of 1,2-Diols: Synthesis and Solid-State 51V NMR CharacterizationDebbie C. Crans, Robert A. Felty, Haojiang Chen, Hellmut Eckert, and Nandini DasCite this: Inorg. Chem. 1994, 33, 11, 2427–2438Publication Date (Print):May 1, 1994Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of Highly Textured Poly(ethylene)/Poly(ethylene-propylene) (E/EP) Semicrystalline Diblock CopolymersPeter Kofinas and Robert E. CohenCite this: Macromolecules 1994, 27, 11, 3002–3008Publication Date (Print):May 1, 1994Publication History Published online1 May 2002…
Abstract Static and dynamic light scattering measurements were performed on a glass‐forming polymer, poly(methyl‐ p ‐tolylsiloxane) (PMpTS; T g =−17°C), in a temperature range of 30°C to 120°C. It was found that long‐range density fluctuations, so‐called clusters, are observed in this polymer. They are characterized b…
As-grown homoepitaxial diamond surfaces fabricated by chemical vapor deposition are terminated by hydrogen, and are expected to have a low density of surface states. On such diamond surfaces, high-quality Schottky contacts have been obtained utilizing metals with low electronegativities, such as Al or Pb. The ideality…
Abstract Different extraction techniques were applied to the fractionation of isotactic polypropylene. In solvent gradient extraction experiments two different solvent/non‐solvent systems were studied. Investigation of the fractions obtained by GPC, DSC and FTIR indicated that the fractionation proceeded according to…