Materials Literature
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Abstract— The spectral characteristics of the emission observed from tropolone, α‐methoxy‐tropone and colchicine in EPA at 77 K are reported. Luminescence polarization, lifetime, quantum yield and energy transfer experiments provide evidence that the luminescence observed is S 1 → S 0 fluorescence and that the lowest…
Electrochemical techniques have been applied to the study of the effect of corrosion on the wear patterns in a 10 cm diameter pilot plant slurry pipeline carrying a freely settling Newtonion slurry of 20 Vol% 30 to 50 mesh silica sand in water. Comparison of specimens with and without cathodic protection made after pe…
The leaching kinetics of lead glasses (25 to 35 mol% PbO‐75 to 65 mol% SiO 2 ; some with K 2 O and A1 2 O 3 , additions) were determined in 10% acetic acid. Except for a ternary glass (SiO 2 ‐PbO‐K 2 O) which had a linear dependence on time, all compositions exhibited a linear dependence on the square root of time for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of Poly(1-phenylbutadiene) Prepared by Anionic InitiatorsToshimitsu Suzuki, Yasushi Tsuji, and Yoshinobu TakegamiCite this: Macromolecules 1978, 11, 4, 639–644Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue…
Abstract The new compounds CaMn 2 As 2 , SrMn 2 As 2 and BaMn 2 As 2 have been prepared and their structures determined. The crystallographic data are (pm): CaMn 2 As 2 : P3̄m 1, a = 423 ± 1, c = 703 ± 1, c/a = 1.66 SrMri2As2: P3̄m 1, a = 429±1, c = 732 ± 1, c/a = 1.70 BaMn 2 As 2 : I4/mmm, a = 415 ± 2, c = 1347 ± 2,…
The magnetic susceptibility ($\ensuremath{\chi}$), electrical resistivity ($\ensuremath{\rho}$), and thermoelectric power ($S$) of bis(tetrathiotetracene)-triiodide were measured for $9<T<300$ K. Bis(tetrathiotetracene)-triiodide crystals were synthesized by vapor-phase cosublimation. X-ray crystal-structure det…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-aminoporphyrins. Preparation and metal complexes. Structure of N-tosylamino-5,10,15,20-tetraphenylporphinatonickel(II)H. J. Callot, B. Chevrier, and R. WeissCite this: J. Am. Chem. Soc. 1978, 100, 15, 4733–4741Publication Date (Print):July 1, 1978Publication History Publis…
Abstract The Eckart frame is a frame of orthonormal vectors e i , i = 1, 2, 3, which follow a vibrating molecule while it rotates. The frame is orientated by the so‐called Eckart condition, which Eckart found by requiring the Coriolis interaction to be minimal. In the present paper we shall see that Eckart's frame als…
The temperature dependences of the saturation magnetization of amorphous ferrimagnetic Co-Gd-Mo-Ar thin films have been analyzed in terms of the mean-field theory. This analysis yields the spin values of Co and the effective exchange interaction energies between Co-Co and Co-Gd atom pairs, which are then correlated wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of water absorbed in collagenC. A. J. Hoeve and A. S. TataCite this: J. Phys. Chem. 1978, 82, 14, 1660–1663Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pubs.acs.org/doi/10.1021/j100503a0…
Abstract The kinetics of craze growth from sharp cracks in polystyrene (PS) and poly(methyl methacrylate) (PMMA) in contact with liquid methanol were measured with time‐lapse photography as a function of the stress intensity factor K I . At high K I the craze length in both systems increases as √ t if the sides of the…
Homogeneous pseudobinary compound series of high magnetic anisotropy exhibit giant intrinsic magnetic hardness at cryogenic temperatures. This work presents data on the temperature and composition dependence of coercive force (${\mathrm{H}}_{c}$) in $\mathrm{Sm}{\mathrm{Co}}_{5\ensuremath{-}x}{\mathrm{Ni}}_{x}$ and $\…
Ternary diffusion theory is used to establish a criterion for the onset of an internal oxidation zone beneath the external scale when oxidizing conditions favor formation of the oxide of the less noble metal in a binary alloy. The problem is posed in terms of ternary solution thermodynamics and diffusion and is correl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerism and charge distribution in mixed-metal polyoxoanion clusters: oxygen-17 nuclear magnetic resonance structure determinations of cis-V2W4O194- and cis-HV2W4O193-W. G. Klemperer and Wilfred ShumCite this: J. Am. Chem. Soc. 1978, 100, 15, 4891–4893Publication Date (Pri…
Accurate X-ray structure factors of CaO, SrO and BaO were measured at 293 K from single crystals and analysed together with the data of Sanger [Acta Cryst. (1969), A25, 694-702] on MgO. The oxygen ion is seen to suffer an average compression and a fourth-order cubic harmonic type deformation, as compared to the atomic…
The crystal structures of the isomorphous complexes K3 [M(oxalate)3],3H2O, M = CrIII and AlIII, have been determined from three- dimensional diffractometer intensity data by conventional Patterson and difference Fourier techniques. The crystals are monoclinic; M = Cr, a 7.714(1), b 19.687(4), c 10.361(2) ?, ß 108.06(3…
The present oxidation study covers the 780°–1150°C temperature range using 0.001 Ω‐cm Si which is heavily B‐ and P‐doped Si in dry . Emphasis is on the lower temperatures thereby extending the scope of already published studies. For 0.001 Ω‐cm Si at temperatures greater than 1000°C, the over‐all oxidation rates were f…
Abstract The structure–property relationships of polyurethane elastomer derived from liquid hydroxylterminated polybutadiene/low molecular weight aliphatic diol/diisocyanate system were studied. The effects of the amount of low molecular weight diol on the mechanical properties of elastomer were discussed on the basis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-soluble lanthanide porphyrins: shift reagents for aqueous solutionWilliam DeW. Horrocks Jr. and Emmanuel G. HoveCite this: J. Am. Chem. Soc. 1978, 100, 14, 4386–4392Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and solid state studies of phthalocyanine thin film electrodesHiroyasu Tachikawa and Larry R. FaulknerCite this: J. Am. Chem. Soc. 1978, 100, 14, 4379–4385Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 J…