Materials Literature
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In tensile strength experiments of highly drawn crystalline polymers by using electron spin resonance the appearance of radicals is observed all over the strained sample long before its fracture. It is generally considered that the radical formation is the consequence of rupture of the most strained tie molecules. The…
The relative potentials of tin, steel, and tin-iron alloy play an important role in controlling the corrosion of tinplate containers used for foods. Stannous ion, pH, and adsorbedfilms influence these potentials. Stannous ion concentration is determined by the complexing strength of certain anions common to foods. The…
The following results were obtained from investigation of DSC thermograms of silk fibroin.1. The decomposition temperature of the crystalline region of silk fibroin is estimated to be about 348°C from the DSC thermograms of the hydrolysis residue.2. Silk fibroin is changed thermally into unoriented β-type by the treat…
Phonon scattering by dislocations was studied by measuring the thermal conductivity of deformed LiF crystals from 1.5 to 300 K. The conductivity is not proportional to T 2 , as observed by Sproull et al. , but is approximately proportional to T 3.5 or to T 3 depending on the deformation mode. After annealing at 300°C…
Abstract A study has been made on the tensile properties of mats of fibrillar polyethylene crystals grown at various temperatures from stirred xylene solutions in a Couette‐type instrument. The stress‐strain behavior of fibrillar crystals precipitated above 100°C was found to be essentially Hookean, and the maximum va…
The experimental observations of temperature oscillations in liquids and gases undergoing free convection are reviewed. The theoretical methods used to study problems of this type are indicated, and the extent to which current theory can account for the observations is discussed. Evidence for the occurrence of convect…
Abstract A procedure is described for the analysis by computer of the output from a differential scanning calorimeter. Enthalpy calibration with a variety of materials confirms that alumina is excellent for this purpose. Both the crystallinity, x T , and the heat of fusion of polyethylene, ΔH T , vary with temperature…
Corrosion inhibitors find application in a great variety of industrial processes, such as pickling operations, petroleum processing, the chemical industry in general and many more. One prominent class of inhibitors is organic amines, predominantly used in acid environments. Their action has been exhaustively investiga…
The relationship between conductivity and sodium content has been investigated for sintered beta‐alumina containing MgO . Conductivities of 3.5 × 10 − 3 , 8.0 × 10 − 3 , and 4.4 × 10 − 3 ohm − 1 ‐ cm − 1 were found for material containing 1, 2, and 4% MgO , respectively, with optimum sodium content. Experimental condu…
Factors which affect the texture and microstructure of Zr-2.5 wt % Nb extruded tubes have been investigated. The major factor that determines th~ texture is the way the metal flows, which is controlled by the die shape, the extrusion ratio and the lubricant. The microstructure is controlled by the temperature during e…
Abstract Aerial oxidation of titanous solutions has been carried out at temperatures between 60° and 95°C. A desired one of titanic oxides of anatase, brookite and rutile types, can be obtained from strongly acidic solutions by selection of the kind and concentration of anions present and temperature.
By a rotating disk method which had quantitatively been treated in fluid motion, silicon epitaxial deposition using the SiCl 4 ‐ H 2 system was effected at various susceptor rotation speeds and various pressures. Calculation of the growth rate was initially made with a one‐dimensional model of an infinite diameter dis…
Abstract Some physical properties of linear polydimethylsiloxanes have been studied. The states and transitions in polydimethylsiloxanes have been investigated by using the method of dynamic heat capacity and a thermomechanic method in the temperature range from −150 to +200°C. The temperature dependence of primary an…
A study was made of the effect of surface preparation and pretreatment on the oxidation of zone‐refined nickel from 500° to 700°C. “Clean,” hydrogen‐reduced surfaces, maintained essentially free of impurities such as S, Si, Fe, and C, oxidized at a faster rate than air‐exposed electropolished or etched annealed nickel…
The total conductivities of a series of ThO 2 ‐ base electrolytes have been determined over a wide range of oxygen activity in atmospheres of H 2 / H 2 O / Ar mixtures. At 1200° and 1400°C and low oxygen activities, a significant conductivity contribution corresponding to hydrogen ion (proton) conduction was found for…
Abstract Vorliegende Arbeit gibt einen zusammenfassenden Bericht zur Kinetik der Keimbildung, wobei besonders der nichtstationäre Verlauf dieses Prozesses untersucht wird. Auf Grund einer eingehenden Diskussion des Keimbildungsmechanismus wird. der Einfluß aktiver Unterlagen, wie auch die Art der Ausgangs‐ und der sic…
The n‐type conductivity in commercially available stabilized zirconia electrolyte tubes was studied from 600° to 1400°C using three independent techniques: emf measurements on H 2 ‐ H 2 O mixtures, coulometric titration of oxygen out of liquid silver or copper, and electrolyte breakdown in gas mixtures with low oxygen…
Abstract Recent experience with a variety of materials in biomedical applications has demonstrated the importance of material form and shape in determining tissue response to implants. An investigation was made of the effect of pore size on the response of loose connective tissue to porous methacrylate implants. With…
Abstract Die Struktur der Verbindung (Ba 2 )( 12 ) (Ni II Te VI )( 6 )O 6 wurde mit Hilfe von Einkristall‐Röntgen‐Beugungsdaten ermittelt und bis zu einem R‐Wert von 2,9% verfeinert. Ba 2 NiTeO 6 kristallisiert rhomboedrisch (Raumgruppe R 3 m) mit a = 5,797 und c = 28,595 Å für die trigonal aufgestellte Elementarzelle…
Low-temperature hydrothermal reactions of metakaolinite have been investigated, with and without additions of silica, by use of the bases LiOH, NaOH, RbOH, and CsOH and also the mixtures NaOH + LiOH, NaOH + KOH, KOH + LiOH, and NaOH + Me4NOH. Over certain temperature and composition ranges reproducible crystallisation…