Materials Literature
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Abstract The adaptation of the Iosipescu test as a method for determination of the stress and strain to failure and the shear modulus of adhesives under uniform shear conditions is described. The design and performance of a number of special purpose instruments and jigs to facilitate sample preparation, bond line thic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet oxygen formation in a solid organic polymer upon irradiation of the oxygen-polymer charge-transfer bandPeter R. Ogilby, Marianne Kristiansen, and Roger L. CloughCite this: Macromolecules 1990, 23, 10, 2698–2704Publication Date (Print):May 1, 1990Publication History P…
Chemisorption of polar organic compounds on iron in containing SH − was discussed on the basis of the hard and soft acids and bases principle (HSAB principle). According to the Frumkin isotherm, surface coverages of the compounds and SH − were determined from the double layer capacitances obtained by impedance measure…
Reduction of [OsVI(P)(O)2] (P = porphyrin dianion) with PPh3, ascorbic acid, or N2H4·H2O in the presence of ROH and RSH yielded [OsIV(P)(OR)2] and [OsIV(P)(SR)2], respectively. [OsIV(OEP)Br2] (H2OEP = octaethylporphyrin) was prepared from [OsVI(OEP)(O)2] and Br2. The dialkoxyosmium(IV) and dibromoosmium(IV) porphyrin…
The coercivity Hci of melt-spun Sm-Fe-Ti alloys can be increased to above 4.0 kA/cm by the addition of Zr and Co. Co-substitutions also enhance the remanence Jr and suppress the formation of α-Fe, both of which result in a high-energy product, (BH)max, of up to 56 kJ/m3, the highest value reported so far for 1:12-type…
Amorphous Sm(Fe11Ti) ribbons were prepared by melt spinning. After heat treatment, very fine grains (≊50 nm) of the ThMn12-structure phase were obtained with no signs of a separate intergranular phase. Each grain appears to be a single domain. The maximum room-temperature coercivity is 0.56 T, rising to 1.20 T at 11 K…
Nd15.4Fe77.8B6.8 magnets of various degrees of crystal alignment have been prepared by the conventional powder metallurgy technique. The alignment of these magnets have been determined by x-ray diffraction and fitting the standard deviation of a Gaussian distribution for the relative intensity versus the angle between…
The magnetic behavior of Mn(SCN${)}_{2}$(${\mathrm{CH}}_{3}$OH${)}_{2}$ in single-crystal form has been studied, and the crystal structure has also been determined. The system is monoclinic, C2/c, Z=4 with a=14.467(5) \AA{}, b=5.927(2) \AA{}, c=10.979(3) \AA{}, and \ensuremath{\beta}=93.19(3)\ifmmode^\circ\else\textde…
Abstract For three series of bimodal networks, the stress-relaxation rates and the tearing energies were shown to exhibit maxima at about the same concentrations of short chains as those at which the tensile strengths, reported earlier, also exhibit maxima. These findings clearly show that the reinforcement produced b…
The influence of heat treatments on the intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) resistance of Inconel(1) 690 (UNS(2) N06690) were studied. The chromium profiles adjacent to the grain boundary were predicted by thermodynamic and kinetic modeling and benchmarked with experimental r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers of carbonic acid. 3. Thermotropic polycarbonates derived from 4,4'-dihydroxybiphenyl and various diphenolsHans R. Kricheldorf and Dirk LuebbersCite this: Macromolecules 1990, 23, 10, 2656–2662Publication Date (Print):May 1, 1990Publication History Published online1…
Terfenol (Tb0.3Dy0.7Fe1.9) and related materials have proven useful as electromechanical transducers. As with other transducers, these materials exhibit hysteresis, which must be included in any model of the transducer. Preisach theory is one of the available models that includes the effects of hysteresis. The theory…
Magnetic properties of melt-spun Co80Zr20−xBx microcrystalline alloys (0≤x≤8) depend crucially on the quench rate.The optimized values of Hc =2.68 kOe and (BH)max =2.10 MG Oe were obtained for Co80Zr16B4 melt-spun with the substrate surface velocity of 48 m/s. A new crystalline phase of Co5Zr was observed.
Rylene sind anellierte Arene , die formal durch Verknüpfung aller peri ‐Positionen von Naphthalin entstehen. Als Modelle für „Polyrylen”︁ 1 , R = H, wurden mehrere lösliche Oligorylene synthetisiert. Bei ihrer Charakterisierung fallen vor allem die geringe HOMO/LUMO‐Energiedifferenz des Quaterrylens 2 , R = t Bu, n =…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and geometric structures of several states of diatomic scandium nitrideKathryn L. Kunze and James F. HarrisonCite this: J. Am. Chem. Soc. 1990, 112, 10, 3812–3825Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1…
The 2:17 magnet alloys form a complex metallurgical system with a large number of interactive compositional and heat-treating variables. A model for the metallurgical behavior of these alloys was proposed by the author in 1983. Subsequent experiments designed to test that model have verified some aspects, significantl…
A number of photochromic spiropyrans and spirooxazines containing mesogenic groups were synthesized. Only one of them, spiro-indoline-naphthoxazine with mesogenic substituent, 4-(4-heptylbenzoyloxy)benzoyloxy in 5-position, revealed mesomorphic properties. Its phase behaviour, photochromism and alignment in the electr…
The release of cisplatin (CDDP) encapsulated in temperature-sensitive unilamellar liposomes to murine SCC VII carcinoma by localized hyperthermia and the effects of the treatment on tumor growth were studied. A transition temperature of the temperature-sensitive liposomes containing cisplatin (LIP-CDDP) was 41 degrees…
The encapsulation of liquid crystals in a polymer matrix produces a material with interesting and potentially useful optical properties. The earliest efforts generated a dispersed phase whose dimensions were comparable to optical wavelengths and therefore afforded materials which were highly scattering. These material…
An investigation of the metallurgy of a pseudobinary section of the ternary-phase diagram has been performed by means of differential thermal analysis, x-ray diffraction, and metallography. Microstructural observations and lattice parameter variations have been interpreted in terms of the existence of a solid solubili…