Materials Literature
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Abstract Studies were carried out to determine the crystalline elastic modulus E 1 along the chain axis for the α‐form of nylon‐6 [poly(ε‐caprolactam)] by X‐ray diffraction. To obtain an inherent E 1 value of this polymer the problem was solved that different orders of meridional reflections give different E 1 values.…
Solutions apparently containing Ni[C 6 F 5 ) 2 are obtained by reaction of anhydrous NiBr 2 with [C 6 - F 5 ]MgBr in THF. The addition of different ligands to these solutions gives four-coordinate nickel(II) complexes of the type (C 6 F 5 ) 2 NiL 2 [L = PEt 3 PBu 3 , PPh 3 AsPh 3 SbPh 3 , OPPh 3 OAsPh 3 , p-Dioxane].…
Sliding friction experiments were conducted with pyrolytic boron nitride in sliding contact with itself and various metals. Auger emission spectroscopy was used to monitor transfer of pyrolytic boron nitride to metals and metals to pyrolytic boron nitride. Results indicate that the friction coefficient for pyrolytic b…
Abstract Untersuchungen der Lochfraßbeständigkeit einer großen Anzahl von Zr‐Legierungen in verschiedenen Lösungen durch elektrochemische Methoden ergaben, daß durch Zusätze von Va‐ und VIa‐Metallen, vor allem aber von Ti, die Lochfraßanfälligkeit des Zr vermindert werden kann. Lokalelementbildende Metalle verschlecht…
Abstract The dielectric constant ϵ′ and the dielectric loss ϵ″ for cellulose fiber were measured over a frequency band 0.2 to 10 Mc/sec and a temperature range from −20 to 80°C. Also, the variation of the dielectric behavior with relative humidity was measured at 25°C. From these data, both the specific resistivity R…
Chemisorption of oxygen on the surface of the grains of ZnO powder layers mainly controls the photoconductivity. The adsorption of oxygen ions is regarded as a chemical reaction at the interface and involves oxygen from the gas atmosphere and electrons from the metal oxide. The changes in the conductivity of ZnO-layer…
A study has been made of the effect of hydrostatic pressure, ranging from 1 to 300 atm. (0·102 to 30·6 N.mm−2) on the corrosion of copper in sea water at pH 7·8 and at a temperature of 10°c. The experimental technique ensured that the content of dissolved oxygen in the sea water was virtually constant over the pressur…
The properties of an even homologous series of alkoxy benzoic acids have been investigated in the crystalline and mesomorphic states by means of thermal microscopy, x-ray scattering and dilatometry. Structural parameters such as inter-lamellar distance d, and the molar volume Vm were studied as a function of the numbe…
A decorated lattice gas model is described which exhibits a transition from the phase-separated to the homogeneous state as the concentration of a surfactant is changed, in agreement with observed microemulsion behaviour. The model also has ordered mesophase regions for suitable concentrations. When direct surfactant…
The equations of motion of a nearly spherical bubble immersed in an incompressible and viscous liquid are deduced using the Lagrangian procedure with a dissipation function. The results appear valid for only slightly viscous liquids.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecontamination of Alkaline Radioactive Waste by Ion ExchangeJ. R. WileyCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 1, 67–71Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1 January 1978https://pubs.acs.org/d…
AlNとAl2O3の混合粉末をホットプレスして得た27R及び21 R-pseudo-polytype及びスピネル型のoxynitrideの熱伝導率を測定し, それぞれ0.015, 0.013, 0.026cal/cm・s・K (300K) であった.アルミナを各種温度で還元・窒化した酸素含有量の異なるAlN粉末を用い, 酸素含有量並びにホットプレス条件の熱伝導性に及ぼす効果について検討した. 熱伝導性は不純物酸素量の増加によって著しく劣化するとともに, 焼結温度によっても影響される. AlN微粉末の表面は一般に非晶質の酸化物で覆われているが, 1200℃以上で非晶質層からコランダムが析出する. コランダムは1650℃以上ではAlN…
A series of extracted fractions from sophora subprostrata was screened by determining anti-ulcer effects in pylorus ligated and stressed rats. Fr. [C-2] had the most potent anti-ulcer effects of all fractions extracted. Sophoradin and sophoranone which were isolated from Fr. [C-2] were also found to have inhibitory ef…
Abstract Although ring‐opening polymerization involving ionic intermediates and Ziegler catalysts are quite extensively used in polymer chemistry, free radical ring‐opening polymerization is extremely rare. We have been able to show that unsaturated spiro ortho carbonates will undergo double ring‐opening polymerizatio…
Abstract The influence of two nucleating agents on the crystallization parameters of 6‐Polyamide was investigated by differential scanning calorimetry and some substantial differences for the crystallization rate of the examined polymers were determined. The induction times t i , the semicrystallization times t 1/2 ,…
Precipitated Mg(OH) 2 particles 0.05 to 1 μm in diam. and of various shapes were calcined in air for 1/2 h at 704°, 816°, 954°, 1093°, or 1232°C. At 704°C, BET surface areas, initially 11 to 32 m 2 /g, increased 1.4‐ to 7.6‐fold, and TEM observations showed pseudomorphs. Depending on the parent crystal size and shape,…
High-resolution 125Te and 77Se Fourier transform n.m.r. spectroscopy has been used to characterize the previously known Te64+, Te42+, Se42+, and Te2Se42+ cations for the first time and several new mixed species in the +1/2 (Te3Se2+, cis- and trans-Te2Se22+, and TeSe32+) and +1/3 (Te3Se32+) oxidation states; the 125Te–…
The formation of surface radicals by adsorption of oxygen on CaO, MgO, γ-Al2O3 and ZnO has been studied by e.s.r. spectroscopy.The oxides, after activation by heating under vacuum, were exposed to oxygen at 298 K. In these conditions (O–2)s and (O–3)s radicals, at concentrations of about 5.5 × 1015 and 1.5 × 1015 spin…
Subsolidus phase relations in the system Na 2 O‐Bi 2 O 3 ‐TiO 2 at 1000°C were investigated by solid‐state reaction techniques and X‐ray diffraction methods. Five ternary compounds were observed in the system: Na 0.5 Bi 4.5 Ti 4 O 15 ; Na 0.5 Bi 0.5 TiO 3 ; a cubic pyrochlore solid solution composed of xNa 2 O.25Bi 2…
During localized (crevice and pitting) corrosion, a local cell is established between an anode within a crevice or pit and a cathode on the surrounding passive surface. Data are presented to show that concentrated acidic chloride solutions, simulating corrosion product hydrolysis within a crevice or pit, produce poten…