Materials Literature
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A new method, for solid‐state bonding between ceramics and metals was developed. An interlayer, which is a composite of the materials to be bonded, is used. The technique can be applied to materials which cannot be bonded by conventional diffusion‐bonding methods because of thermal‐expansion mismatches. It is ex pecke…
In this paper, the current state of the art of molecular theories of nematic mesophases is reviewed. For this purpose, the many theories of nematogens which have been proposed are grouped into two classes: (1) the Maier-Saupe theory and its extensions and variants, which assume that nematic long-range order is primari…
The chromatin structure in solution has been studied by the flow linear dichroism method (LD) in a wide range of ionic strengths. It is found that increasing the ionic strength from 0.25 mM Na2EDTA, pH 7.0 to 100 mM NaCl leads to a strong reduction of the LD amplitude of chromatin and inversion of the LD sign from neg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor electrodes. 50. Effect of mode of illumination and doping on photochemical behavior of phthalocyanine filmsPatrick Leempoel, Fu Ren F. Fan, and Allen J. BardCite this: J. Phys. Chem. 1983, 87, 15, 2948–2955Publication Date (Print):July 1, 1983Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 line shape study of two-site exchange in solid dimethyl sulfoneMark S. Solum, Kurt W. Zilm, J. Michl, and David M. GrantCite this: J. Phys. Chem. 1983, 87, 15, 2940–2944Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published ini…
The synthesis and some important properties of the l-(trans-4′-n-alkylcyclohexyl)-2-(4”-cyanophenyl)ethanes—where n-alkyl = C 1 to C 7—are described. These stable low melting materials have excellent properties comparable in many ways with those of the PCH materials wherein the cyclohexyl and phenyl rings are directly…
Abstract Permeability and time‐lag measurements for H 2 and CO in poly(vinyl chloride) (PVC) plasticized with tricresyl phosphate show that the apparent diffusion coefficients at first decrease as the plas‐ticizer concentration is increased. The diffusion coefficients then increase as the additive concentration is rai…
Silicon nitride, Si 3 N 4 , used as a passivating layer in microelectronics, exists in the crystalline forms α ‐ Si 3 N 4 and β ‐ Si 3 N 4 and as amorphous material. Although the two crystalline modifications differ only slightly in their structure, it has been found that each modification can be distinguished by infr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclic polysiloxanes from the hydrolysis of dichlorosilaneDietmar Seyferth, Christian Prud'homme, and Gary H. WisemanCite this: Inorg. Chem. 1983, 22, 15, 2163–2167Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 198…
Sinterable β‐Sic powders were synthesized by carbothermic reduction of silica with carbon in a high‐temperature rotary furnace. The powders were character ized as to sinterability, surface area, particle size, and morphology .
SUMMARY Nanoplankton can be readily attached to polylysine‐coated substrates for examination by transmission and scanning electron microscopy. This simple technique gives high yields of organisms which are consistently better preserved and less obscured by detritus than samples dried directly on to substrates.
Significant increases in the critical fracture toughness (K IC ) over that of alumina are obtained by the stress‐induced phase transformation in partially stabilized ZrO 2 particles which are dispersed in alumina. More importantly, improved slow crack growth resistance is observed in the alumina ceramics containing pa…
Dopamine was transformed into a redox chemical system for delivery to the brain. The lipoidal form allowed penetration of the blood-brain barrier. Oxidative and hydrolytic processes then transformed the delivery form into a quaternary ammonium precursor of dopamine. The quaternary ammonium precursor was rapidly elimin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh pressure NMR kinetics. 19. Variable pressure and temperature nuclear magnetic resonance and visible spectrophotometric studies of lanthanide ions in dimethylformamide: solvation and solvent exchange dynamicsDino L. Pisaniello, Lothar Helm, Pierre Meier, and Andre E. Mer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and excited triplet-state electron paramagnetic resonance of the .SIGMA.-bonded TCNQ dimer in bis(2,9-dimethyl-1,10-phenanthroline)copper(I) tetracyanoquinodimethane dimer [Cu(DMP)2]2[TCNQ]2Stanislaw K. Hoffmann, Peter J. Corvan, Phirtu Singh, C. N. Sethule…
Data on amino acid composition were collected in order to classify proteins into groups. The composition of a protein is expressed as a point in an orthogonal coordinate system, taking fractions of amino acids along 18 axes, which represent 18 amino acids (we use Asx and Glx for the sum of Asp and Asn and that of Glu…
An adiabatic scanning calorimeter has been used in a calorimetric investigation of alkyl-cyanobiphenyl (nCB) liquid crystals. Measurements near solid to smectic (KA), smectic A to nematic (AN) and nematic to isotropic (NI) or smectic A to isotropic (AI) phase transitions have been carried out for scanning rates as low…
An organic polymer Kapton H film was irradiated with high-energy (∼MeV) N+2 ions. The specific resistivity of the film irradiated to a dose ∼1017 N/cm2 was estimated to be ∼10−2 Ω cm, which is about 20 orders of magnitude smaller than that of the unirradiated film. With increase of dose, the irradiated region of the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase structure of solvent-cast diblock copolymers and copolymer-homopolymer blends containing spherical microdomainsFrank S. Bates, C. V. Berney, and R. E. CohenCite this: Macromolecules 1983, 16, 7, 1101–1108Publication Date (Print):July 1, 1983Publication History Pub…
Birefringence in three orthogonal directions was determined at normal incidence by the compensator method on thin sections of cellophane sheets, before and after subjecting them to swelling and stretching treatments. Considerable increase in crys tallinity and longitudinal orientation of molecular chain axes was achie…