Materials Literature
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The growth of Pseudomonas oleovorans on n-octane was characterized by the formation of intracellular structures. These inclusions were isolated and characterized. Morphologically, they resembled the poly-beta-hydroxybutyrate granules found in Bacillus cereus, as shown by freeze-fracture electron microscopy. The elemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of barium sulfate-vanadium pentoxide-silica glass mixtures for preparation of sulfur dioxide in sulfur isotope ratio measurementsFumitake. Yanagisawa and Hitoshi. SakaiCite this: Anal. Chem. 1983, 55, 6, 985–987Publication Date (Print):May 1, 1983Public…
The enhancements of normal Raman scattering, resonance Raman scattering, and fluorescence from molecules adsorbed on identical, well-characterized, silver-island films are reported. The enhancement arises from the electromagnetic interaction between the molecules and the electronic plasma resonance of the silver islan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and properties of segmented polyether polyurethaneureasCarl B. Wang and S. L. CooperCite this: Macromolecules 1983, 16, 5, 775–786Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 May 1983https://pubs.acs.org/doi…
The contemporary state of the structural chemistry of the hydrides of intermetallic compounds is discussed. X-ray and neutron diffraction data on hydride phases are surveyed and critically analysed. Tetrahedral and octahedral coordination are shown to be most typical for hydrogen atoms in the structures of multi-compo…
Experiments involving competitive and cooperative adsorption of pyridine, ${\mathrm{Cl}}^{\ensuremath{-}}$, SC${\mathrm{N}}^{\ensuremath{-}}$, and Tl, and voltage induced resonance shifting show that the largest surface-enhanced Raman scattering intensity comes from complexes of these species adsorbed on defects which…
A simple empirical relation connects the critical temperature of the order-disorder transition ${T}_{c}$ to the dipolar reorientation rate ${\ensuremath{\tau}}^{\ensuremath{-}1}(T)$ of C${\mathrm{N}}^{\ensuremath{-}}$ molecules by the concept of a critical reorientation rate ${{\ensuremath{\tau}}_{c}}^{\ensuremath{-}1…
A new, semiempirical model of metals and impurities (embedded atom method) makes possible a static treatment of the brittle fracture of a transition metal in the presence of hydrogen. Results indicate that hydrogen can reduce the fracture stress in nickel.
Recent advances in the intercalation of metal complex cations in smectite clay minerals are leading to the development of new classes of selective heterogeneous catalysts. The selectivity of both metal-catalyzed and proton-catalyzed chemical conversions in clay intercalates can often be regulated by controlling surfac…
X-ray diffraction measurements have been made of the wavevector and intensity of satellite diffraction spots as a function of temperature in two examples of crystal B phases. In N-(5-n butyloxybenzylidene)-4-n-heptylaniline (5O.7) a simple sinusoidal layer modulation of fixed wavelength grows in amplitude with decreas…
For pt.II see ibid., vol.15, p.3445 (1982). The authors consider diffusion from a surface y=0 into a solid containing a regular array of d dislocations per unit area, all normal to the surface and each represented as a pipe of radius a within which the diffusion coefficient D' is very much greater than that, D, for di…
Calculations of the electronic structure of WO 3 suggest that the detailed crystallographic arrangement determines rather sensitively the size of the semiconducting energy gap. This increases from 1.6 eV in the perovskite-like cubic approximation to the structure, as used in the only previous study, to 2.4 eV in the f…
The luminescence decay time of the 1.945 eV centre has been determined as 13+or-0.5 ns for natural type Ib diamonds. For synthetic diamonds the value is slightly lower, probably because of competitive non-radiative recombination in these relatively impure crystals. The similarity of the decay time to that for the H3 c…
A review of the polymerization of cycloorganosiloxanes is provided. Cycloorganosiloxanes such as octamethyl cyclotetrasiloxane are the principal intermediate for the formation of high molecular weight polyorganosiloxane polymers. The ring opening reaction can be initiated through the use of suitable basic or acidic ca…
Heat capacity of As4S3 is measured in the range 100 to 500 K. The structural phase transition (β to α) and the crystalline-to-plastic phase transition (α to γ) are investigated and these phase transition temperatures are determined to be (422 ± 0.5) and (432 ± 0.5) K, respectively. The results are compared with those…
The ternary compounds PtMnGe, PtMnAl, FeNiIn, FeMnIn, FeNiGe, FeCoGe, FeMnGe, CoNiSn, FeNiSn, FeCoSn, and MnCoSn are found to crystallize in the hexagonal Ni2In structure. The lattice constants of these compounds are determined and their magnetic properties studied in the range 4.2 to 300 K. It is found that most of t…
Electrical conductivity of bull amorphous V2O5 obtained by splat cooling is measured in the temperature range 360 to 150 K. A continuous decrease of the activation energy W deduced from a plot of In (σT) vs. T−1 is observed in the whole range. Such a behaviour is typical of small polaron hopping in amorphous transitio…
The electrical conductivity and the thermoelectric power of some finely-divided cobalt and zinz ferrites near stoichiometry are studied as a function of firing temperature and atmosphere. It is determined that iron-excess ferrites obtained at low preparation temperature or firing in vacuum above 600 °C are of n-type a…
Recently, Alig, Bloom, and Struck have reported a simple model of ionization scattering in semiconductors and insulators. Their model is based upon the random-$k$ approximation to the transition rate for impact ionization, and upon a generic band structure with only two free parameters to describe all materials. The p…
We present a systematic study of thermal diffusivity in the nematic liquid crystalline phase of 4-4′-di-(n-alkoxy) azoxy benzenes and several other materials. The data allow to separate the respective contributions of the rigid central core and of the flexible aliphatic chains. For the component of the diffusivity ten…