Materials Literature
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Abstract The ability of selected phosphorus‐containing compounds and nitrogen‐containing compounds to act as flame retardants for cotton cellulose was investigated using flame tests, thermal gravimetric analysis (TGA), and differential thermal analysis (DTA). The effectiveness of the organophosphorus compounds was fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRuthenium complex having both linear and bent nitrosyl groupsCortlandt G. Pierpont, Donald G. Van Derveer, William Durland, and Richard EisenbergCite this: J. Am. Chem. Soc. 1970, 92, 15, 4760–4762Publication Date (Print):July 1, 1970Publication History Published online1 May 200…
Abstract The weathering of biotite in a sedentary soil profile developed on biotitehornblende- rock near Rehiran, Inverness-shire has been investigated by optical, X-ray, chemical, infrared and differential thermal methods. In the C horizon a direct transformation to hydrobiotite was observed. This involves oxidation…
Measurements of the solubility of calf-skin tropocollagen in neutral phosphate buffers in the temperature range 20-37 degrees C show that native collagen fibril formation is an endothermic process made thermodynamically favourable by a large positive entropy of precipitation associated with structural changes in the s…
Measurements have been made of magnetization curves obtained by applying stresses to various polycrystalline magnetic materials in the presence of a small, constant, magnetic field. The materials examined were nickel, mild steel, and both isotropic and cube textured silicon iron. Residual stray fields were carefully c…
Abstract Recently developed techniques permit the estimation of the surface free energy of polymers and the separation of this free energy into dispersion and hydrogen‐bonding components. These techniques have been used to calculate the thermodynamic reversible work of adhesion of a vinylidene chloride copolymer coati…
In x-ray photoe lectro n spectrosco py (XPS), a sample is exposed to low energy x rays (a pp rox im ately keY), and th e res ultant photoelectrons a re analyzed with hi gh precis ion for kin eti c energy. Aft er co rrection for in e las ti c scatt erin g, th e measured ph otoe lectron spectrum s hould refl ect th e va…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTANNUAL REVIEW Solids MixingL. T. Fan, S. J. Chen, and C. A. WatsonCite this: Ind. Eng. Chem. 1970, 62, 7, 53–69Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Published inissue 1 July 1970https://pubs.acs.org/doi/10.1021/ie50727a009https://…
Compression-annealed pyrolytic graphite and single-crystal graphite specimens were irradiated with neutrons for total exposures of 3 to 71×1017 neutrons/cm2 (nvt) at 50°C, 3 to 8×1019 nvt at 650°C and 1.2×1020 nvt at 1000°C. The elastic constants of the materials were determined before and after irradiation by ultraso…
Abstract Poly(ethylene glycols) of molecular weights 200 to 20000 were strongly adsorbed on montmorillonite from aqueous solution. Free energies of adsorption calculated from the adsorption isotherms became more negative with increase in molecular weight and the entropy change became increasingly positive, probably du…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-base equilibriums, kinetics of copper ion incorporation, and acid-catalyzed zinc ion displacement from the water-soluble porphyrin .alpha.,.beta.,.gamma.,.delta.-tetrakis(1-methyl-4-pyridinio)porphine tetraiodidePeter Hambright and Everly B. FleisherCite this: Inorg. Ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance study of coordination to the fifth and sixth positions of .alpha.,.beta.,.gamma.,.delta.-tetra(p-methoxyphenyl)porphinatocobalt(II)Frances Ann WalkerCite this: J. Am. Chem. Soc. 1970, 92, 14, 4235–4244Publication Date (Print):July 1, 1970Publication H…
From a study of silane coupling agents in reinforced plastics, a general mechanism of adhesion to hydrophilic mineral surfaces has been devised. According to this theory, adhesion of polymers to dissimilar surfaces is described as a dynamic equilibrium of making and breaking of adhesion bonds between polymer segments…
Surface seawater is generally supersaturated with CaCO 3 ; but carbonate will not precipitate from natural seawater in convenient experimental times. If the supersaturation is increased by the addition of Ca 2+ or CO 3 2− ions, precipitation can occur in minutes or hours. Seawater, with 0.1 m Na 2 CO 3 solution added…
The wettability of AlN, TiB 2 , TiN, and TiC by liquid aluminum was investigated by the sessile drop technique at 2×10 ‐7 torr or less. The contact angle decreased linearly with increasing temperature in all cases. Variation of the contact angle with temperature is correlated with the surface tension of the drop, and…
The ferroelectric phase transition in PbTi${\mathrm{O}}_{3}$ has been investigated by the neutron inelastic scattering technique. As is the case with BaTi${\mathrm{O}}_{3}$, the soft optic mode at the zone center condenses when the temperature is lowered to the Curie point at 490\ifmmode^\circ\else\textdegree\fi{}C. I…
The electronic and ir spectra of rare earth perovskites of the general formula LnZO 3 , where Ln is the rare earth ion or yttrium and Z is Cr, Mn, or Fe, have been studied in detail. The results have been discussed in terms of crystallography, magnetic properties, covalency of Ln—O and Z—O bonds, and Goodenough's one…
It is shown by an analysis similar to that for the spinodal decomposition of a supersaturated solution that an array of dislocations, modelled by parallel screw dislocations, of uniform density, is unstable; the dislocations move to form a structure having a modulated dislocation density. It is suggested that the inst…
Abstract The fluorescence yield of europium chelates in several solutions varies, through its maximum value, with the increase in the energy difference between the triplet state of a ligand and the emitting level of an europium ion. The time-resolved spectroscopic measurements show that the excitation energy is transf…
The nature of the chemical bond in crystals is discussed. The general theories of L. Pauling based on thermochemical data and of C. A. Coulson based on valence bond concepts are compared with a recent spectroscopic theory. Particular emphasis is placed on binary crystals of formula ${\mathrm{A}}^{N}{\mathrm{B}}^{8\ens…