Optical Resolution of a Heteropolymolybdate Anion
Tomoharu Ama, Jinsai Hidaka, Yoichi Shimura; Optical Resolution of a Heteropolymolybdate Anion, Bulletin of the Chemical Society of Japan, Volume 43, Issue
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Rates of crystallization of copolyamides. II. Random copolymers of nylons 66 and 6
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…
26—THE RÔLE OF WATER IN THE SETTING OF WOOL: A STUDY OF SETTING AT TEMPERATURES ABOVE 100°C: PART I: DEGREE OF SET
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…
Diffusion in gold-aluminium
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…
Catechol complexes with silicon
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…
Ladder polymers from tetraaminodiquinoxalpyrene
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…
Mössbauer Spectra of Iron Tetraphenylporphins
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…
Effect of Dopants on the Defect Structure of Single‐Crystal Aluminum Oxide
Density and lattice parameter changes induced by dopants were studied in Czochralski rubies containing from 0.054 to 0.160 wt% Cr 2 O 3 , in Czochralski sapphires containing from 0.083 to 0.120 wt% TiO 2 , and in verneuil crystals grown from powders containing 250 to 1000 ppm Ca, Mg, Si, and V. Densities were determin…
The thermal degradation in vacuo of an amine‐cured epoxide resin
Abstract The degradation in vacuo of the cured resin from stoichiometric amounts of the diglycidyl ether of bisphenol A and p,p′ ‐diaminodiphenylmethane was studied at temperatures of 303.7 and 304.0 ± 0.2°C. The condensible products of the degradation at these temperatures were collected and the major components were…
Factors Affecting Potassium Fixation and Cation Exchange Capacities of Soil Vermiculite Clays
Abstract Soil vermiculite clays of varying tetrahedral and octahedral composition and cation exchange capacity (CEC) were examined for their ability to fix K + in both the wet and dry states. Fixation capacity, expressed as per cent of the CEC, in the wet state was fairly high for most samples but it was enhanced grea…
Bonding in dye aggregates. Energetics of the dimerization of aqueous cobalt(II)-4,4',4'',4'''-tetrasulfophthalocyanine ion
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding in dye aggregates. Energetics of the dimerization of aqueous cobalt(II)-4,4',4'',4'''-tetrasulfophthalocyanine ionZ. A. Schelly, D. J. Harward, Paul Hemmes, and Edward M. EyringCite this: J. Phys. Chem. 1970, 74, 16, 3040–3042Publication Date (Print):August 1, 1970Pu…
Dispersion of dielectric permittivity due to space-charge polarization
A method has been developed for calculating the effective complex permittivity of a solid dielectric arising from the motion of charge carriers which are blocked at the electrodes. The method makes use of computer simulation of the motion of the charge carriers and is valid for high voltages. Results are given of calc…
Polyarylsulfones, synthesis and properties,
Abstract A new class of high molecular weight polyarylsulfones is described. Polymer synthesis and structure–property relationships are discussed. The polymers are prepared by Friedel‐Crafts type polycondensation of aromatic sulfonyl chlorides with aromatic hydrocarbons. A number of Lewis acids in small quantities are…
Effective Electron-Hole Interaction in Shallow Excitons
The Green's function method developed by Mahan for excitons is extended to the case that the interaction is not instantaneous. Energy corrections to the exciton due to recoil effects, retardation effects, renormalization constants and vertex parts arising from the interactions of an electron and a hole forming an exci…
Elastic Properties of MnF2
The elastic properties of Mn${\mathrm{F}}_{2}$ have been investigated in the temperature range $4.2<T<330$ K using a cw transmission technique. The measured values at $T=300$ K of the six adiabatic elastic constants in units of ${10}^{11}$ dyn/${\mathrm{cm}}^{2}$ are ${c}_{11}=10.24$, ${c}_{33}=16.55$, ${c}_{44}…
Recombination luminescence in alkali halides
Results are presented of a study of x-ray and electron excited luminescence in all alkali halides in the temperature range 4K to 300K. Details are given of the spectral distribution and lifetimes associated with the luminescence bands at about 5K. The lifetime and peak intensities of some bands have been measured as a…
Cation Self-Diffusion and Semiconductivity in NiO
Nickel self-diffusion and semiconductivity in single-crystal NiO have been measured as functions of temperature and O2 pressure over ranges of 1182–1762°C and from one to 5 × 10−7 atm. Atmospheres of pure O2, pure CO2, O2–Ar mixtures, and CO–CO2 mixtures have been used. In pure O2 and in pure CO2 the results can be ex…
Adsorption of water and 18O exchange of surface hydroxyl groups on silica
Infrared spectroscopy has been used to show that the surface hydroxyl groups on highly dehydrated silica will exchange with 18 O-labeled water. The degree of exchange depends on the sample temperature and is a maximum at about 400 °C, where approximately 65% of the silanol groups contain 18 O. The use of the 18 O exch…
Effect of Cold Rolling on Resistance of Ni-Fe Alloys to Hydrogen Cracking
Low carbon 10-19% Ni-Fe alloys become considerably more resistant to hydrogen cracking after severe cold rolling. The observed resistance decreases with increasing carbon content. The improvement is directional, the optimum effect applying to specimens stressed parallel to the rolling direction. Other iron alloys, e.g…
Hydrocarbon ladder aromatics from a Diels‐Alder reaction
Abstract The Diels‐Alder homopolycycloaddition of 2,5‐diphenyl‐3,4‐(5,6‐acenaphthylenylene)‐cyclopentadienone (VIII) affords a low molecular weight soluble ladder polymer having reduced specific viscosities between 0.17 and 0.25 dl/g in benzene and an insoluble fraction of higher molecular weight. The ladder polymers…