Materials Literature
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SummaryExperiments investigating a novel method of preparing composite coatings are described. In this method, the dispersed phase, which may be fibrous or granular, is incorporated into a metallic matrix by suspending the fibres or particles in a plating bath suitable for electroplating the matrix material. Provided…
P. W. M. Jacobs and A. R. T. Kureishy, J. Chem. Soc., 1964, 4718 DOI: 10.1039/JR9640004718
The present investigation describes the successful modification of the surface properties of polymeric solids by the adsorption of appropriate partially fluorinated compounds at polymer-air interfaces during the formation of the polymer surfaces. The extent of additive adsorption was found to be dependent upon the mol…
(1964). Chemical Studies on the Constitution of Some Pollen and Spore Membranes. Grana Palynologica: Vol. 5, No. 2, pp. 247-252.
According to a theory developed by Landau and Khalatnikov, the approach of long-range order to equilibrium can be characterized by a relaxation time with a temperature dependence of the form: τ=β/(Tc − T), where β is constant and Tc is a second-order phase transition temperature. The ferroelectric material, triglycine…
When spider webs were left intact in the aluminum-glass boxes in the laboratory, most animals ate old webs daily and built new ones. The new webs were built with a larger amount of thread protein, increasing steadily in weight with increasing length of the non-elimination period, to more than 3 times in 8 days. The in…
The principles of plain-weave geometry established by Peirce1 and Kemp2 are extended to weaves other than plain to give a system of fabric geometry applicable to all types of woven cloths. A particular application of the system to the measurement and specification of fabric tightness is also described.
Tantalum substitutions up to 5 atomic per cent (a/o) of the cations have been made in the three Group VIB dichalcogenides, , , and . Tantalum‐substituted p‐type had the best thermoelectric properties with a figure of merit about . Substitution of a number of other elements was attempted in the compounds and , but only…
Abstract The spectral distribution of photoconductivity in Ag 2 O was measured on samples prepared in three different ways. The photoresponse was found to depend on the mode of preparation of samples and on previous light exposure. Samples prepared by pressing Ag 2 O powder against a cellulose backing showed a photoco…
R. J. H. Clark, J. Chem. Soc., 1964, 417 DOI: 10.1039/JR9640000417
The oxidation at 300° K of high purity iron surfaces prepared under ultra-high-vacuum conditions was studied using ellipsometry to measure film thickness. By working at low oxygen pressures (between 10–7 and 10–4 torr) it was found that the early stages of the oxidation process followed a linear growth law with rate b…
Longitudinal ultrasonic absorption and velocity measurements were made in molten zinc chloride in the frequency range 5–95 Mc/sec. Shear relaxation measurements were obtained in the frequency range 43–118 Mc/sec. A single relaxation time was observed for the absorption of longitudinal waves at each temperature investi…
A study of rare earth oxide phosphors activated by rare earths revealed that fluorescence occurs only in those matrices where the cation possesses no unpaired electrons. The fluorescent intensities of the rare earth activators were divided into three categories, strong, medium, and weak, each having a characteristic e…
Measurements of Young's modulus as a function of pressure up to 10 000 bars at 20°C show that the glass-transition temperature in natural and synthetic rubbers is raised by pressure. For natural gum rubber, the transition occurs at 5100 bars at 20°C and Young's modulus increases 1000-fold on passing through the transi…
Abstract The preparations of the 3:1 hydroxide halides Me 2 (OH) 3 Cl, ‐Br and ‐I of Mg, Ni, Cu, Co, Fe and Mn are described, and the corresponding X‐ray data registered. The following structures were found: Layer structures : (a) C6 type [α‐Mg 2 (OH) 3 Cl, α‐ Ni 2 (OH) 3 CI, α‐Co 2 (OH) 3 Cl, α‐Fe 2 (OH) 3 CI, α‐Mn 2…
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Les composés monocliniques pseudo-hexagonaux (groupe I/2m) Cr3X4 = □ Cr2+I (Cr3+II)2 X24- (X = S, Se, Te) dérivent du type NiAs. Les lacunes □ ordonnées du réseau des cations se trouvent dans des plans (101). Dans l'hypothèse d'interactions isotropes, on déduit théoriquement les configurations magnétiques possibles. L…
Grain boundaries in crystalline solids exert a pronounced influence on almost all the properties of polycrystalline bodies, as well as affecting the kinetics of most solid-state processes that occur therein. They have therefore been the subject of numerous theoretical and experimental researches in both metallic and n…
L. M. Brown and A. R. Thölén, Discuss. Faraday Soc., 1964, 38, 35 DOI: 10.1039/DF9643800035
_allows a possible interpretation of the mechanism of the. reactions and prediction or the experimental rate constants of similar reactions. The decompositions involving Mgco 3 and Caco 3 a:re m.ost suitable for detailed analysis on the basis of the availabill ty of dependable rate data. and infrared crya tal spectra…