Materials Literature
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A new type of information on the distribution of electron density in crystals of biological macromolecules is proposed. This is a quasihistogram of the image of the function of electron density distribution at a finite resolution. It is shown how this information should be used to restore the values of low-angle struc…
Abstract Blends of 50/50 natural rubber (NR) and styrene‐butadiene rubber (SBR) are vulcanized using several conventional and semi‐EV systems. The cure characteristics and vulcanizate properties are compared. The quantity and quality of crosslinks in each case are deciphered by chemical probes to correlated them with…
The dc electrical conductivity of MgO‐doped Cr 2 O 3 and the defect models with the defect structure of a sesquioxide were investigated as a function of oxygen partial pressure, temperature, and dopant content. The electrical conductivity of MgO‐doped Cr 2 O 3 is increased with oxygen partial pressure and temperature.…
This article demonstrates the stable levitation of single small gas bubbles in water in a downward directed visible laser beam. The natural upward buoyancy of the bubbles was counteracted by the optical radiation pressure of the light beam, whose optical power ranged from 1–3.5 W. The sizes of the levitated bubbles ra…
The dependence of the saturation polarization, the Curie temperature, the anisotropy field strength, and the intrinsic coercivity of sintered Nd-Fe-TM-B magnets on the concentration of metals, such as Al, Cr, Mn and Cu, was examined. The relation of the intrinsic coercivity to the anisotropy field strength and localiz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome intrinsic kinetic equations and deactivation mechanisms leading to deactivation curves with a residual activityJose Corella, Juan Adanez, and Antonio MonzonCite this: Ind. Eng. Chem. Res. 1988, 27, 3, 375–381Publication Date (Print):March 1, 1988Publication History Publ…
Abstract Esters of ω‐alkenoic acids have been homopolymerized with transition metal initiating systems. The key to the successful polymerization was the complexation of the monomer prior to its addition to the initiating system. Titanium trichloride, aluminum activated, was found to be best as the transition metal par…
Abstract Racemic and enantiomerically enriched poly(propylene oxide)s were prepared using α, β, γ, δ‐tetraphenylporphyrin/AlEt 2 Cl as initiator system. Triad tacticity of the polymers was analyzed by 13 C NMR spectroscopy (62,89 MHz). A predominance of isotactic triads was observed in the case of the racemic polymer,…
The effect of pressure on the rate of Al/Si disorder in microcline has been determined at temperatures from 750°C to 900°C and at pressures up to 28 kbar using samples dried at 850°C in Pt capsules prior to sealing. The presence of any water would induce melting, and none was observed. The effect of pressure in the pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of electric and magnetic fields on orientational disorder in liquid crystalsDavid A. Dunmur and Peter Palffy-MuhorayCite this: J. Phys. Chem. 1988, 92, 6, 1406–1419Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1…
We present a set of observations of large-angle grain-boundary structures in zinc, obtained by transmission electron microscopy. The necessary formalisms for relating experimental observations to theoretical predictions of the boundary structures are given. Dislocation structures are observed in several boundaries, in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrthometalation of m-bis(dimethylaminomethyl)benzene: crystal structure and chemistry of trans-Rh(III)Cl2[C6H3(CH2NMe2)2-o,o'](H2O)Adolphus A. H. Van der Zeijden, Gerard Van Koten, Ronald Luijk, Kees Vrieze, Cees Slob, Hendrik Krabbendam, and Anthony L. SpekCite this: Inorg.…
Abstract Blends of nylon‐6 and EPDM rubber were prepared by reaction blending to study the influence of rubber concentration, rubber particle size and interfacial adhesion on the impact strength. Rubber particles induce a sharp brittle‐tough transition which is independent of the glass transition of the nylon matrix.…
Keywords: clays ; critical state ; overconsolidation ; state boundary surface ; symmetry ; yield envelopes ; yielding ... Show All
Abstract Binary interaction parameters, X ij have been determined for the monomer pairs, styrene‐acrylonitrile and methyl methacrylate‐acrylonitrile from phase separation measurements in homopolymer‐copolymer blends. These have been used to predict regions of miscibility in different blends of statistical copolymers w…
Abstract not Available.
Zinc- and aluminum-substituted cobalt-ferrite thin films were prepared on fused quartz substrates using vacuum evaporation followed by heat treatment. Magnetic measurements and X-ray diffraction analyses of the films showed that zinc and aluminum were successfully substituted in the spinel lattice and that the Curie t…
The well known, extremely reactive [18]annulene 1 and the hypothetical isomer 2 should be capable of being stabilized by CH2- and CHCH-groups as internal and external bridges, respectively. The corresponding hydrocarbons, 3 and 4, are still unknown, although they are of great interest as links between the non-natural…
The doping and undoping characteristics of alkali‐metal doped polyacetylene are investigated using cyclic voltammetry and complex impedance measurement techniques. Reversibility, charge transfer resistance , double layer capacitance , and general impedance behavior are discussed.
Ceramic powders containing dispersed inert particulates often exhibit dramatically lower densification rates than the pure powder. This decrease results from the shrinkage incompatibilities of the matrix and the inclusion during densification. The analyses of this phenomenon all predict that the shrinkage rate is only…