Materials Literature
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The selective reflectance of S-cholesteryl 14-phenyltetradecanethioate was determined as a function of the wavelength and temperature at several constant values of temperature and wavelength respectively. The dependence of wavelength λp measured at maximum selective reflectance on temperature T could be curve fitted w…
A number of the Te-containing perovskites compounds have been studied. It has been established that some of them are either ferro-, ferri or antiferroelectrics. The influence of the different factors on the Curie temperatures is analysed. A tentative conclusion about the principal role of the Te6+-sublattice vis-a-via…
By the use of a quasi-static method the complex piezoelectric constant d22 of AgNa(NO2)2 has been measured over a temperature range -100°C ∼ 38°C and a frequency range 10 Hz ∼ 20 kHz. It was found that d22 shows a dispersion of Debye type, d22 =d∞ + (do - d∞)/(1 + iwr), where the relaxation time τ coincides with that…
I.r. and visible spectra identify the blue species in solutions of alkali polysulphides in dimethylformamide (DMF) as S3–. Elemental sulphur (S8) is reduced to S3– by secondary amines in hexamethylphosphoramide (HMPA). The reaction of piperidyl-lithium with S8 in HMPA has been investigated to determine the stoicheiome…
Abstract The structure and self‐assembly of collagen and procollagen molecules are reviewed. The registration peptides of procollagen have specific recognition properties which assure (1) selection of component polypeptide chains and (2) registration of their N‐termini, facilitating orderly folding into a collagen hel…
Article Equiatomic Ternary Phases in the Alloys of the Rare Earths with Indium and Nickel or Palladium was published on January 1, 1974 in the journal International Journal of Materials Research (volume 65, issue 1).
Flexural strengths, elastic moduli, and fracture energies of 3BaO·5SiO 2 glass‐ceramics with a variety of microstructures were determined. Flexural strength depends on the size of spherulites in the microstructure and on the amount of glassy phase remaining in the material. Higher strengths were achieved in glass‐cera…
セルロース繊維を濃厚AcOK水溶液で処理し,付着AcOKを洗浄除去後80℃で乾燥するとセルロースの(010)に相当する位置に新しい子午線干渉。が出現する。乾燥温度を高くするにしたがいIoは9.5Aの面間隔をもつ一次層線干渉Iiへ次第に変わっていく。これらの干渉は完全なセルロースの干渉のほかに付加的に出現するもので,処理によってセルロースの結晶化度はまったく変わっていない。したがって新干渉は非晶領域に生じたセルロースAcOK付加物によるものと考えられる。カリウムセルPtを酢酸で洗浄することにより,より完全なセルロース-AcOK付加物のX線図を得た。これから付加物の単位胞を求め,11は(110)に指数付けされた。非晶域に生成した付加物…
Since Coster-Kronig transitions for isolated atoms are often characterized by higher transition rates than other types of Auger emission, it is important to consider the quantitative effect of these transitions on the Auger electron spectroscopy of solid surfaces. We find that cross sections for the electron impact io…
A solid-state electrochemical cell with pellets of Ag 4 KI 5 as the electrolyte, silver foil as the anode and a mixture of I 2 and graphite as the cathode is described. This cell, Ag|Ag 4 KI 5 | I 2 +C, has an open circuit voltage OCV of 680 mV. Cell characteristics under different load conditions are reported. Polari…
It is shown that the presence of distinct SbIII and SbV atoms in the mixed-valency compound Cs2SbCl6 can be directly demonstrated by X-ray photoelectron spectroscopy. The surface purity of the material can be checked by supplementary studies using argon ion bombardment.
The coarsening of lamellar eutectic alloys is controlled by faults in the as-grown structure. A model, based on the use of In cosh cylinder co-ordinates, is proposed to calculate the rate of shrinkage of lamellar terminations. It is found that for high volume fractions and diffusion through the continuous phase around…
Specimens of an enameling steel were exposed at 57 sites of the National Air Sampling Network (NASN). Weight losses for one and two years of exposure at each site were determined. Available climatic data were collected and average relative humidities and average temperatures were calculated. Average levels of pollutan…
Previous work in this Laboratory showed that many inhibitors of the acid corrosion of steel cause large changes in the anodic Tafel slope, ba, particularly in 0·5 M H2SO4. It was found that cationic inhibitors, such as long-chain n-alkylquaternary ammonium compounds, mostly reduced ba whereas non-ionic compounds, such…
It is shown that the best fit of experimental data to the correlation equation as used by Fowkes1 cannot be considered as a criterion of correctness with which the mathematical formula expresses the way of polar interaction at interfaces. Examples of other evidence are given that the polar part of work of adhesion may…
The kinetics of oxidation of arsenic(III) by chromium(VI) has been studied in the temperature range 30–45 °C. The energy and entropy of activation, where a high concentration of arsenic(III) reacts with a low concentration of chromium(VI) to give a 1 : 1 complex, have been evaluated to be 9·1 ± 0·6 kcal mol–1 and –43·…
The molar conductivity of doped MBBA is given by Onsager's equation for electrolytic conduction. The anisotropy of the conductivity is determined largely by the anisotropy of the viscosity of the host material. Experimental values for A° and α are presented.
The overall partition of iodine between air and aqueous solution containing sodium hydroxide is very complicated due to the complex reactions of iodine dissolved in the aqueous phase. The equilibrium constants of the several elementary reactions which influence the overall partition were measured for the range of 10°…
Plasma-sprayed composites, which have good oxidation-resistance and self-lubricating characteristics to 900 C, were developed. The composites are a nichrome matrix containing dispersed glass for oxidation protection and calcium fluoride for lubrication; they are applied to bearing surfaces by plasma spraying layers ab…
Abstract The biomaterials engineer of today has an extremely limited choice of approved metallic implant alloys with which to conduct his studies. There is essentially no incentive for larger companies to initiate basic research in the biomaterials field. New alloys which would have the best chance of developing as bi…