Materials Literature
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Enzyme-solubilized collagen was cast into films with different fibrillar structures and cross-linked with glutaraldehyde. Cross-linked films had decreased swelling ratios, decreased degree of hydrolysis, increased resistance to bacterial collagenase, and increased shrinkage temperatures. Subcutaneous implantation in r…
Single crystals of with dislocation and inclusion levels below 5/cm 2 were grown in a nitrogen atmosphere with an infrared television system of computer controlled Czochralski crystal growth. Coring was prevented by a high crystal rotation rate and a slow pull rate during growth, although striations occurred in the cr…
Using room temperature diffractometer intensity data the structure of Rb2TeCl6 has been determined by single crystal X-ray diffraction and refined to a final R of 0·050. The structure consists of regular octahedral [TeCl6]2–[Te–Cl = 2·541 Å(corrected)]. Lattice energy calculations on the resulting structure (for vario…
Ultraviolet high sensitivity reflection spectra of the copper electrode surface have been measured in situ under the potentiostatic polarization in 3% NaCl aqueous solution. In the deaerated nearly neutral 3% NaCl solution containing 0.0002 M BTA (benzotriazole), BTA-Cu (I) (benzotriazole-cuprous salt) film was formed…
Compressive surface stresses were formed in hot‐pressed Al 2 O 3 by quenching. Flexural strength was improved substantially, up to a maximum of 223,000 psi. The variation of strength with grain size of the quenched bodies was similar to that of the unquenched material, but the strengths were shifted to higher values.…
The influence of dislocation behaviour on void formation and growth has been studied in the High Voltage Electron Microscope (HVEM). Variation of the interstitial loop density has been used to control the concentration of biased linear sinks available for point defects, and thereby the vacancy excess required for void…
Abstract The kinetics for dehydrochlorination and benzene formation has been studied during the degradation of two samples of poly(vinyl chloride) (PVC) at 180–200°C under vacuum with and without the removal of hydrogen chloride. The effects of various additives, such as organic phosphites, mercury, silver, gold, and…
The transition temperature and the heat of transition between the hydrate and the anhdrous forms of phenobarbital were determined to be 36.4° and 1.87kcal/mole, respectively by the initial dissolution rate measurements. These values were in good agreement with values obtained by the conventional solubility equilibrium…
Because of the continued escalation of interest in liquid crystals and in their applications in display devices, the efforts of organic chemists have recently been concentrated on the synthesis of better mesogens for technological exploitation. Therefore, although the stability of available liquid crystal materials, t…
The natural analogue of gehlenite hydrate synthesized by Carlson (1964) was found as an alteration product of gehlenite from Fuka, Okayama Prefecture, Japan, and as a crust on wollastonite from Carneal, Northern Ireland. The chemical analyses of the impure Fuka material substantiate the validity of Carlson's formula 2…
The title compound has been shown by X-ray single-crystal study to be isostructural with α-realgar, As4S4. Least-squares refinement of the structure gave R 0·11 for 1008 observed photographic reflections. The far-i.r. spectrum consists of As–Se stretching (205–253) and bending bands (93–135 cm–1). Mean distances: As–A…
Saturation magnetization values and uniaxial anisotropy constants at 20°C, also Curie points and other magnetic transition temperatures are reported for the alloys Sm2(Co1−xFex)17 as a function of x. For x = 0.3–0.7, the 2:17 phase is probably metastable at room temperature. Saturation has a peak of ∼16300 G at x = 0.…
Annealed Zircaloy-2 was exposed to fast neutron fluences in the range 0.46 to 6.71 × 1019 nvt, E > 1 MeV, at temperatures of up to 450°C. The level of radiation hardening, as measured by the change in yield stress after irradiation, increased with irradiation temperature at least up to 380°C. Post-irradiation annealin…
Abstract The kinetics of deacetylation and benzene formation, and the polymer crosslinking and absorption spectra of PVAc during thermal degradation (in vacuo at 200–280°C with or without removal of volatile products) were studied. The effects of the molecular weight of PVAc samples and the addition of various substan…
Preparative electrolyses of triethylammonium heptanoate using different types of carbon as the anode material are reported. In protic solvents dodecane, the Kolbe dimer, is the major product at vitreous or baked carbon anodes, but the major products at a graphite anode are the three hexyl heptanoates. Large difference…
Phases and compositions obtained from the molten systems CsPbCl3–CsPbBr3 and CsPbClnBr3–n-CsSnClnBr3–n have been identified and compared with those from the CsSnCl3–CsSnBr3 system. X-Ray powder data are consistent with all of the products being single-phase solid solutions based on the perovskite lattice and in which…
The equilibrium phase diagram of the lithium‐tellurium phase system has been investigated. Eutectic points occur at 179.9°C and greater than 99.0 atomic per cent (a/o) lithium, 448.5°C and 35.7 a/o lithium, and 423.1°C and 10.5 a/o lithium. Two intermediate phases, and , are present having melting points of 1204.5° an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of fusion and heat capacities of lithium chloride-potassium chloride eutectic and potassium nitrateRobert P. ClarkCite this: J. Chem. Eng. Data 1973, 18, 1, 67–70Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 J…
Abstract The kinetics of polymerization of various isocyanides by nickel(II) compounds has been studied. The data suggest that reaction occurs by means of successive isocyanide insertions at a positive nickel centre.
Magnetic circular dichroism (m.c.d.) and absorption spectra of the hexacyanoferrate (III) ion have been measured in two host lattices at room and liquid-helium temperatures. Previous interprepations of the charge-transfer(c.t)bands have been confirmed and new assignments of the d-d transitions have been made. With the…