Flame retardants for polymer systems
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Anchoring strength for twist deformation at a nematic liquid crystal-wall interface
We measured the twist rotation at the wall-nematic liquid crystal interface in MBBA and ZLI 1738 samples placed in a magnetic field giving a pure twist deformation. Homogeneous boundary conditions were obtained by rubbing two silane coated glasses softly with teflon. In the samples examined, a rotation angle of the or…
Effects of polyethylene glycol on the size of agglomerated crystals of phenytoin prepared by the spherical crystallization technique.
The effects of polyethylene glycol (PEG) 4000 dissolved in the crystallization solvent on the size of agglomerated crystals of phenytoin prepared by the spherical crystallization technique with a bridging liquid (i.e. isopropyl acetate) were investigated. The average diameter of agglomerated crystals at equilibrium, w…
Physicochemical characterization of oxyphenbutazone and solid-state stability of its amorphous form under various temperature and humidity conditions.
Four modifications (monohydrate, hemihydrate, anhydrate, and amorphous form) of oxyphenbutazone were prepared and characterized by the use of X-ray powder diffractometry, thermal analysis, infrared spectrophotometry, and elemental analysis. The physicochemical stability of the amorphous form was quantitatively investi…
Diffusion of Dopant in Crystalline Silicon: An Asymptotic Analysis
An existing model of the diffusion of dopant in crystalline silicon is presented. The model is used in predicting semiconductor device properties. For small concentrations of dopant, the diffusion is linear. However, at large concentrations, enhanced diffusion occurs. This may be modelled by a concentration-dependent…
Analytical Investigation on Cyclic Deformation and Fatigue Behavior of Polycrystalline Cu–Al–Ni Shape Memory Alloys above M<SUB>s</SUB>
Cyclic deformation and fatigue behavior of polycrystalline Cu–Al–Ni shape memory alloys above Ms point have been studied in a preceding paper (Trans. JIM, 27 (1986), 592), and the experimental results have been analyzed in the present paper. Almost all the experimental results, that is, extrapolation of the transforma…
Instrumented Impact Testing of Ceramics
Many researches on ceramics have been reported, but brittleness is a key problem to be overcome. However, no generalized method on impact test of ceramics has been reported.The total absorbed energy evaluated from the Charpy impact test for brittle materials includes largely the energy absorbed by the machine and the…
A partially bilayered smectic B (Bd) phase of a thermochromic mesogen
N-hexadecyl-p-cyanopyridinium iodide was studied using X-ray scattering, differential scanning calorimetry and polarized light microscopy. Preliminary results reveal that the material is thermochromic, turning from yellow to red upon entering a liquid crystal phase at 104°C. The mesophase is of the smectic B type, whe…
Mechanism of Improvement on Corrosion Resistance by Copper Addition to Ferritic Stainless Steels
The mechanism of improvement on corrosion resistance by copper addition to ferritic stainless steels was studied electrochemically. Cathodic reaction of copper added ferritic stainless steels is accelerated with progress of corrosion, presuming as the effect of fine metallic copper precipitated on surface. Anodic reac…
High pressure compressibilities of pyrite and cattierite.
Compressibilities of pyrite and cattierite have been examined by the single-crystal X-ray diffraction method up to 42 kbar and 36 kbar, respectively. Both S–S and M–S (M: Fe, Co) bonds in both of the minerals are contracted linearly with pressure within the experimental pressure ranges. However, contraction of the S–S…
A BSE scintillation detector in the (S)TEM
Abstract A single crystal YAG: Ce 3+ annular scintillator axially placed in a movable light guide forms the essential part of a new BSE detector. Comparison of properties of this detector with those of a semiconductor detector is made. The bandwidth, signal‐to‐noise ratio, capacitance effects, and relative efficiency…
Magnetic and spectroscopic study of some binuclear and trinuclear cobalt(II) carboxylate complexes
Binuclear [Co2(RCO2)4L2] and trinuclear [Co3(RCO2)6L2] cobalt(II) carboxylate complexes have been prepared (R = unsaturated alkyl, L = sterically hindered amine). The roles of electronic and steric effects on the formation of oligonuclear cobalt(II) carboxylates are discussed. The temperature dependence of their antif…
Thermal Shock Resistance of Ceramic Cutting Tools
Most ceramic materials are unsuited to conditions involving non-uniform temperature distributions because of their inherent brittleness. Ceramic cutting tools operate in conditions of rapid temperature variation and consequently thermal cracking is frequently observed. Under certain cutting conditions, these cracks ar…
Effects of Relative Humidity on Atmospheric Stress Corrosion Cracking of Stainless Steels
In order to evaluate the effect of environmental parameters on atmospheric stress corrosion cracking (SCC) of SUS 304 and 316L stainless steels, SCC tests were carried out in laboratory air controlled temperature and relative humidity (RH) environment by using U-bend specimens with the deposition of 0.5N chloride solu…
Structure of the iodine columns in iodinated nylon‐6
Abstract A study of iodine‐complexed nylon 6 films by polarized resonance Raman spectra shows the presence of both I 3 − and I 5 − species, the latter most likely in the form of an I 2 / I 3 − complex. Polarization characteristics of the Raman spectra show that the I 2 / I 3 units are orinted along the polymer chain a…
Two-phase titration of some imidazole derivatives in pharmaceutical preparations
The two-phase titration of miconazole, econazole and clotrimazole in vaginal tablets and suppositories, creams and lotions using indophenol blue as a hydrophobic indicator and sodium dodecyl sulphate as a titrant is proposed. The accuracy and precision of the method are good. The non-interfering substances that are pr…
Silicon-29 NMR structural characterization of two novel germanosilicate cages in a tetramethylammonium germanosilicate solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 NMR structural characterization of two novel germanosilicate cages in a tetramethylammonium germanosilicate solutionC. T. G. Knight, R. James. Kirkpatrick, and Eric. OldfieldCite this: J. Am. Chem. Soc. 1986, 108, 1, 30–33Publication Date (Print):January 1, 1986Pu…
Regeneration of pentasil zeolite catalysts using ozone and oxygen
A novel procedure for the removal of carbonaceous deposits from zeolites using ozone-enriched oxygen is described. Pentasil zeolites (SiO2/Al2O3 mole ratios 35, 70) were studied and deactivated using methanol conversion to hydrocarbons and o-xylene isomerisation. Low temperature ozone reactivation was found to restore…
Novel quinone-type acceptors fused with sulphur heterocycles and their highly conductive complexes with electron donors
p-Benzoquinone derivatives fused with sulphur-containing heterocycles are strong electron acceptors and some of their charge transfer complexes with electron donors show high electrical conductivities.
Thermotropic compounds having two terminal mesogenic units and central spacers. Part 7. Homologous α,ω-bis-[p-(4-alkoxyphenoxycarbonyl)phenoxy]alkanes
A homologous series of α,ω-bis-[p-(4-alkoxyphenoxycarbony)Phenoxy] alkanes was prepared; their thermal and liquid crystalline properties were studied by differential scanning calorimetry and on the hotstage of a polarizing microscope. The nature of the liquid crystalline phase of the compounds depended greatly on the…