Materials Literature
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Abstract During our investigations of the synthesis of ferroelectric liquid crystal compounds containing a fluorenone nucleus, the formation of a novel compound having a –C(O)–S-O– linkage was discovered as a by-product when a derivative of fluorenone carboxylic acid was treated with thionyl chloride and a phenol. Thi…
The spectrum of cadmium was photographed in the 300 Å-500 Å region using a sliding spark and a triggered spark as light sources. Seventeen levels of the 19 of the 4 d 7 configuration and 106 out of the 180 levels of the 4 d 6 5 p configuration of Cd VI have been established. 350 lines have been classified in the 4 d 7…
Abstract The crystal structure of (CH 3 ) 4 NTlCl 4 and (C 2 H 5 ) 4 NTlCl 4 was determined at room temperature by single crystal technique. (CH 3 ) 4 NTlCl 4 : D 2h 17 -Cmmm; Z = 2; a = 913.2pm, b = 894.6 pm, c = 752.5 pm; (C 2 H 5 ) 4 NTlCl 4 : C 6v 4 -P6 3 mc; Z = 2; a = 827.9 pm, c = 1329.8 pm. (C 2 H 5 ) 4 NTlCl…
The Fe 3+ reduction reaction was studied at Pt and polyaniline rotating disk electrodes by steady‐state and impedance methods with the aim of testing the possibility of achieving the charge transfer resistance ( R ts ) of a redox reaction mediated by a conducting polymer film by ac impedance. R ts was obtained as a fu…
Abstract The Raman spectrum of [MgCl(THF) 5 ] [FeCl 4 ] · THF includes all four Raman‐activ vibrations of the [FeCl 4 ] − anion, thus supporting the results obtained by x‐ray analysis. On the other hand, no vibration which could be assigned to the MgCl bond has been observed, which may indicate that this bond is more…
A scanning electron microscope (SEM) with an immersion-type objective lens has been developed. The objective lens generates a strong axial magnetic field of about 0.17 T at a wafer surface and has a very short focal length of about 2.5 mm. The SEM realizes an image resolution of 30 Å at 0.7 kV accelerating voltage. Th…
Polyester multifilament yams with different frictional characteristics have been air textured under both dry and wet texturing conditions. Wet textured yams are more stable and have higher bulk, and the surface structure of these yarns shows higher loop frequency, lower loop height, and a higher percentage of protrude…
Characteristics of Mg2SiO4(Tb) thermoluminescent dosimeters (TLD) were ascertained preparatory to measuring doses from diagnostic x-ray examinations received by Adult Health Study participants. These detectors are small, relatively sensitive to low-dose x-rays, and are appropriate for precise dosimetry. Extensive cali…
Abstract The crystal structure of monoclinic CuF 2 has been refined by the Rietveld method from X-ray powder diffraction data. The structure is monoclinic, space group P2 1 /n, a = 3.2973(2), b = 4.5624(3), c = 4.6157(3) Å, β = 83.293(3)°, V = 68.96(2) Å 3 , with Cu +2 at (0,0,0) and F −1 at (−0.04176(68), 0.29410(35)…
The four component condensation (4 CC, Ugi reaction) of aqueous alginic acid with formaldehyde, difunctional amine and isocyanide components produces a gel. Enzymes, e.g. “acidic phosphatase” (AP) and L-(+)-lactate dehydrogenase (LDH), can be immobilized by inclusion in the above crosslinked alginic acid. The enzymes…
Intermetallic Sm(Fe1−xCox)2 compounds having the cubic MgCu2-type structure absorb a small quantity of hydrogen from the atmosphere under normal conditions. A magnetic annealing of such samples leads to the induction of a gigantic magnetic uniaxial anisotropy, which is linked to the ordered distribution of hydrogen in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimines from terephthalaldehyde and aliphatic diamines. 1. Synthesis, CP-MAS carbon-13 NMR spectra, and thermal analysisAlmeria Natansohn, Haixin Yang, and Carolyn ClarkCite this: Macromolecules 1991, 24, 20, 5489–5496Publication Date (Print):September 1, 1991Publication…
Rodlike polymers with repeat units composed of groups with high π-electron density directly on the backbone, such as linearly conjugated double bonds and aromatic heterocyclic rings, exhibit high isotropic refractive indexes and high birefringence values when oriented. Typical polyamide birefringence values for orient…
Due to its excellent electrical conductivity and high electromigration resistance, copper is widely predicted to be the interconnect metal of the future for electronic microdevices. This presentation focusses upon the synthesis of a new series of volatile liquid Cu+l complexes which are shown to be suitable for the de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR study of the mechanism of the chlorine and bromine atom initiated oxidation of acetyleneG. Yarwood, N. Peng, and H. NikiCite this: J. Phys. Chem. 1991, 95, 19, 7330–7337Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published ini…
Abstract Theoretical and experimental investigations are made of magnetooptical activity (MOA) of (parity) forbidden intraconfigurational 4f–4f transitions in Er(PO 3 ) 3 rare‐earth paramagnetic phosphate glasses. The interpretation of magnetooptical spectra in frames of a theoretical scheme similar to Judd‐Offelt's t…
Simple expressions for the shear modulus G and the bulk modulus B for an amorphous metal are derived. The derivation was accomplished by using a Gaussian distribution for the nearest-neighbour distance and a two-particle interatomic potential. It is shown that the difference between G or B and their crystalline counte…
The 35 Cl NQR frequencies of A 2 PdCl 6 were studied. For A = (CH 3 ) 4 N + a clathrate [(CH 3 ) 4 N] 2 PdCl 6 · Cl 2 was found and its crystal structure was determined (Fd3 c, Z = 32, a = 2554.5 pm, R = 0.062). The clathrate [(CH 3 ) 4 N] 2 SnCl 6 · Cl 2 was prepared, too. It is isomorphous with the corresponding pal…
The crystallographic nature of a quasicrystal structure is expressed in terms of the possibility of labeling `translationally' equivalent atomic positions by a set of n integers. The corresponding position vectors are integral linear combinations of n basic ones generating a vector module M of rank n and dimension m.…
The smectic layer structure within texture lines is investigated with a (sub)micrometer optical measuring spot. The property that the SmC-cone is perpendicular to the smectic layer is used to measure the in-plane rotation angle of the local smectic layers. From the measurements and observations it is concluded that te…