Fluorescence of Eu2+‐Activated Binary Alkaline Earth Silicate
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1H NMR Studies on the Reorientational Motions of Cations in Four Solid Phases of Methylammonium Iodide and the Self-Diffusion of Ions in Its Highest-Temperature Solid Phase
Abstract Four solid phases of CH3NH3I named as α′, β′, δ, and ε were studied by the temperature dependence of 1H spin-lattice relaxation time T1 and 1H spin–spin relaxation time T2 (for ε) at several NMR frequencies, and of 1H NMR second moment. Phase transitions were studied by means of differential thermal analysis…
Effects of doping pairs on the preparation and dielectricity of PLZT ceramics
By doping Li2CO3, Na2CO3, B2O3 and Bi2O3 into PLZT 8/65/35, the diffuse phase transition is enhanced and the sintering temperature is lowered. In order to balance out the charge fluctuations caused by doping, a R-a-R3+b pair doping is adopted. Low temperature coefficient of capacitance (TCC) of the doped PLZT 8/65/35…
Kinetics and reaction pathways of methanol oxidation on platinum
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and reaction pathways of methanol oxidation on platinumR. W. McCabe and D. F. McCreadyCite this: J. Phys. Chem. 1986, 90, 7, 1428–1435Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.o…
Light scattering and dielectric studies of molecular association in mesogenic solutions
Results are reported of light scattering and dielectric measurements on solutions of 4-n-pentyl-4′-cyanobiphenyl (5CB) and 4-n-pentyl-4′-cyanobicyclo-hexane (5CCH). Correlation factors g 1 and g 2 are deduced from the measurements, and are discussed in terms of a model for molecular association. It is concluded that a…
Hydrophilic-hydrophobic interpenetrating polymer networks (IPN's) synthesized under high pressure. 1. Morphology, dynamic mechanical properties, and swelling behavior of polyurethane-polystyrene IPN's
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophilic-hydrophobic interpenetrating polymer networks (IPN's) synthesized under high pressure. 1. Morphology, dynamic mechanical properties, and swelling behavior of polyurethane-polystyrene IPN'sJae Heung Lee and Sung Chul KimCite this: Macromolecules 1986, 19, 3, 644–6…
Two R Curves for Partially Stabilized Zirconia
The enhanced fracture toughness due to stress‐induced transformation can be explained from two viewpoints: (1) the increase can be attributed to the need to supply a work of transformation, or (2) the transformation can be considered to result in internal stresses which oppose crack opening. Experimental results for m…
Factors affecting bicarbonate chemistry and iron chlorosis in soils
The bicarbonate ion has been implicated as a causative agent in iron chlorosis induced by high moisture in calcareous soils. Our studies have demonstrated a correlation between soil solution bicarbonate and chlorosis in soybeans in fields in western Minnesota and under growth chamber conditions. In the growth chamber…
Long‐term Effects of Mesquite Removal on Soil Characteristics: II. Nutrient Availability
Abstract Previously we reported differences in nutrient availability of desert grassland soils under mesquite [ Prosopis juliflora (Schwartz) DC] trees and adjacent open areas. In a related study conducted at that same time (1967), several mesquite trees were removed to measure shading effects. Since then about half o…
Crystallization of MgO‐Al 2 O 3 ‐SiO 2 ‐ZrO 2 Glasses
The crystallization of MgO‐Al 2 O 3 ‐SiO 2 ‐ZrO 2 glasses at 1000°C was studied. Isothermal heat treatments of a cordierite‐based glass (2MgO.2Al 2 O 3 .5SiO 2 = Mg 2 Al 4 Si 5 O 18 ) with 7 wt% ZrO 2 produced surface crystallization of α‐cordierite and tetragonal ZrO 2 ( t ‐ZrO 2 ). These phases advanced into the gla…
Chain conformation and solubility of associating polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain conformation and solubility of associating polymersM. E. Cates and T. A. WittenCite this: Macromolecules 1986, 19, 3, 732–739Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.org/doi/10.10…
Mechanical properties of crosslinked polyethylene
Abstract The mechanical properties of crosslinked polyethylene were studied in an extended range of test conditions in order to determine the recommended service conditions for articles made of crosslinked polyethylene. On the other hand, this study can clarify the advantages of crosslinked polyethylene against the un…
Measurements of tilt angle and heat capacity in the vicinity of one smectic-A–chiral–smectic-Ctransition
Both high-resolution heat-capacity and tilt-angle measurements have been carried out near the smectic-A--chiral--smectic-C transition of p-(n-decyloxy)benzylidene-p-amino-(2-methlbutyl)cinnamate (DOBAMBC). The extended mean-field theory, suggested by Huang and Viner, for the smectic-A--smectic-C (or chiral--smectic-C)…
The effects of grain size on the core loss and permeability of motor lamination steel
The effect of grain size on core loss and permeability was studied in three heats of silicon-free motor lamination steel. Grain sizes in the final test specimens ranged from 7 to 1360 µm. The core loss and permeability were measured at 10 and 15 kG ac, and 15 kG dc. Regression equations were constructed which took acc…
Catalytic reactions of metalloporphyrins. 1. Catalytic modification of borane reduction of ketone with rhodium(III) porphyrin as catalyst
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic reactions of metalloporphyrins. 1. Catalytic modification of borane reduction of ketone with rhodium(III) porphyrin as catalystYasuhiro. Aoyama, Takamichi. Fujisawa, Hiroo. Toi, and Hisanobu. OgoshiCite this: J. Am. Chem. Soc. 1986, 108, 5, 943–947Publication Date…
Crystallography of Stress‐Induced Martensitic Transformations in Partially Stabilized Zirconia
The phenomenological theory of martensite crystallography was applied to the tetragonal‐monoclinic transformation in zirconia. Operation of variants of the lattice deformation can lead to a near‐twin orientation relation between different regions of a transformed particle, and if these regions are in the form of plate…
Self-diffusion in branched polymer melts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion in branched polymer meltsCraig R. Bartels, Buckley Crist Jr., Lewis J. Fetters, and William W. GraessleyCite this: Macromolecules 1986, 19, 3, 785–793Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March…
Palladium(II) and Platinum(II) Complexes of 1,4,7,10,13,16‐Hexathiacyclooctadecane
A new form of coordination of the versatile ligand hexathia[18]crown-6 is found in the title compounds: Pd or Pt is coordinated to four S atoms in a square planar fashion; only long range weak axial interactions are observed with the two remaining S atoms of the macrocycle. That is, the macrocycle does not behave like…
Structural and chemical properties of 1,3-cyclodisiloxanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and chemical properties of 1,3-cyclodisiloxanesMichael J. Michalczyk, Mark J. Fink, Kenneth J. Haller, Robert West, and Josef MichlCite this: Organometallics 1986, 5, 3, 531–538Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Pub…
Light and scanning electron microscopic studies on wrinkles in aged persons' skin
Wrinkles in six aged persons (67-82 years of age) have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). There are two types of wrinkles. One is a deep wrinkle which develops on the sun-exposed skin and does not disappear on stretching (permanent wrinkle). The LM and SEM showed less el…