Materials Literature
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The observed degeneracy of mutually exclusive infrared- and Raman-active modes in MoS2 is traced by means of group theory to the weak van der Waals interaction between layers.Received 29 June 1970DOI:https://doi.org/10.1103/PhysRevLett.25.362©1970 American Physical Society
Measurements of the lifetime for positron annihilation in metals show a temperature dependence which has been ascribed to the trapping of positrons at vacancies. An explanation of this trapping process is presented in terms of an effective potential well, whose depth is the difference between the bottom of the positro…
Abstract The solubility behaviour of CuI was studied in KI‐acetone media in the concentration range of approximately 0.05 to 0.2 M. Within this range of iodide concentration, Cul 2 − was the only complex species found to occur in the liquid as well as in the solid phase. Conductometric studies also indicated the exist…
Potonie emend., is distally baculate and proximally smooth. Matonisporites Couper emened., has thicker corners, membraneous Y-rays and smooth exine. Callispora Dev emend., is characterized by having incipiently thickened angles and punctate exine. Boseisporites Dev emend., possesses two-layered exine, the outer layer…
The fatigue crack propagation behavior of Zircaloy-2 subjected to various environmental conditions was examined within the framework of linear elastic fracture mechanics. It was found that the fatigue crack growth rate increased with increasing levels of cold work, increasing temperature, and exposure to a water envir…
Abstract Release of potassium by extraction with solutions containing sodium tetraphenyl boron or by leaching with 0·1 N barium chloride seemed to be related to the nature of the mica layers in the interstratified minerals studied. The rate of potassium release was lower when the calculated Si/Al IV ratio of the mica…
Abstract Polyoxymethylene was successfully grafted with styrene, butadiene, and acrylonitrile by the mutual irradiation method in the monomer containing 18% of dimethyl formamide. The CO 2 and water vapor permeabilities and diffusivities were determined in the case of the butadiene‐ and acrylonitrile‐grafted products.…
The chemical and physical properties of cotton fabrics treated with formaldehyde in the presence of an acid catalyst (HCl) under aqueous (Form W) and essentially nonaqueous (Form D) conditions were investigated. Physical properties (tear strength, breaking strength, and crease recovery), functional group content (acid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the titanocene-promoted fixation-reduction of molecular nitrogenEugene E. Van Tamelen, Douglas A. Seeley, Stewart W. Schneller, H. Rudler, and W. CretneyCite this: J. Am. Chem. Soc. 1970, 92, 17, 5251–5253Publication Date (Print):August 1, 1970Publication Hi…
Abstract Synthesis of the first totally organic spiro polymer was accomplished by the reaction of 1,4‐cyclohexanedione and pentaerythritol in benzene plus a trace of p ‐toluenesulfonic acid to produce the polyspiroketal. The polymer did not melt, but began to decompose at 350°C. Although it was insoluble in most commo…
An investigation has been conducted to explore the possibility of using solid state Al2O3 in thermoluminescent dosimetry. The dosimeters were exposed to radiation energies ranging from 100 keV to 35 MeV. They displayed a constant response from 500 keV to 35 MeV comparable to LiF, and permitted accurate readings from 1…
Vanadium dioxide undergoes a crystallographic phase transformation at 68°C which is accompanied by a large and abrupt change in resistivity. Two devices, a two-terminal threshold switch and a four-terminal thermal relay, based on this effect are investigated theoretically and experimentally with regard to switching ap…
Abstract Poly(ethylene adipate), poly(ethylene suberate), and poly(ethylene sebacate) were synthesized by a modified ester interchange procedure. Polydispersity was reduced and low molecular weight material removed by fractional crystallization. Samples of 50–60% crystallinity were prepared by bulk crystallization and…
Tomoharu Ama, Jinsai Hidaka, Yoichi Shimura; Optical Resolution of a Heteropolymolybdate Anion, Bulletin of the Chemical Society of Japan, Volume 43, Issue
Abstract Rates of crystallization of copolyamides of nylons 66 and 6 have been measured by a photometric technique using a hot‐stage microscope. The copolymers all show some crystallinity, but the temperatures of crystallization are reduced as more comonomer is introduced. A close correlation between melting and cryst…
Permanent setting of wool fabrics can be achieved by setting in steam autoclaves at temperatures above 100°C. An account is given in this paper of experiments performed on a laboratory scale and on full-scale equipment in which fabrics were set in rolls. One of the main problems in this kind of process is to ensure an…
A combination of reflectivity, adhesion and resistance measurements has been used to measure the rates of phase boundary movement in thin-film couples during the interdiffusion of gold and aluminium. The various measurements have been compared and correlated to show that diffusion occurs in two distinct stages. The fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatechol complexes with siliconDennis W. BarnumCite this: Inorg. Chem. 1970, 9, 8, 1942–1943Publication Date (Print):August 1, 1970Publication History Published online1 May 2002Published inissue 1 August 1970https://pubs.acs.org/doi/10.1021/ic50090a038https://doi.org/10.1021…
Abstract A new fused aromatic heterocyclic tetraamine 2,3,11,12‐tetraaminodiquinoxal [2,3‐e,2′,3′‐1] pyrene has been prepared and polymerized with 1,4,5,8‐naphthalenetetracarboxylic acid and pyromellitic dianhydride. The resulting ladder polymers with inherent viscosities ranging from 0.5 to 1.0 dl/g in methanesulfoni…
Abstract Mössbauer spectra were measured for a series of the central iron in Fe(II)- and Fe(III) complexes of tetraphenylporphin. The electronic structure of the central iron in the complex was modified by the axial ligand field. The Mössbauer spectra assigned the most probable electronic configurations to various iro…