Materials Literature
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In the local deformation of the c-domain BaTiO3 crystal an “internal” 90° domain is formed in its bulk which does not reach any of the crystal surfaces. Conditions for its formation, its geometry and growth dynamics have been investigated. The effects of the monodomainization, “ageing” after “molding” by an electric f…
Abstract— A mathematical model of crack propagation due to the formation of a fractal cluster of voids and microcracks is presented. The initiation of a microcrack from a pile‐up of dislocations in the vicinity of a crack tip is modelled. A method to determine the fractal dimension of a crack, based on the crack growt…
Based on a microbalance, we have constructed a low-field Faraday magnetometer, which does not suffer from instability even with strongly ferromagnetic samples. The intrinsic value of this technique is that simultaneous gravimetric determination of the interstitial content (for example H, N or C) is possible. The desig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Crosslinking of Polyacrylamide with Cr(III). Analysis of Possible MechanismsThore M. Klaveness and Peter RuoffCite this: J. Phys. Chem. 1994, 98, 40, 10119–10123Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published in…
The purpose of this work is to increase the understanding of carding system dynamics based on mathematical tools that will ultimately lead to the development of on-line real-time controllers for carding. The work comprises both modeling the process and comparing simulated results with experimental data. A mathematical…
Abstract The interplay of overpressure and diagenesis is an important factor in developing reservoir quality and controlling the movement of pore-fluids and hydrocarbons within sedimentary basins. The first part of this introduction deals with petrographic features by which certain highly overpressured reservoirs can…
The relationship between the plane-wave Born approximation (PWBA) and the impulse approximation (IA) for the antiscreening contribution to electron loss is studied. It is shown that the IA can be obtained from the PWBA in the case of fast, asymmetric collisions. In this collision regime, it is shown that the broadenin…
A ``many-letter'' sequence model of random heteropolymers is introduced and studied. We examine the case where there is a tendency for phase separation with respect to certain types of interaction as in the case of hydrophobic and hydrophyllic interactions in proteins. It is shown that a freezing transition to a state…
The magnetic behavior of Co-Mn and Ni-Mn alloys is typical of competing interaction systems with regions of ferromagnetism and antiferromagnetism enclosing an intermediate concentration region in which only magnetic short-range order (MSRO) occurs. Neutron diffuse scattering measurements were made on alloys from this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacile Quantitative Analysis of Hydroxyl End Groups of Poly(2,6-dimethyl-1,4-phenylene oxide)s by 31P NMR SpectroscopyK. P. Chan, D. S. Argyropoulos, D. M. White, G. W. Yeager, and A. S. HayCite this: Macromolecules 1994, 27, 22, 6371–6375Publication Date (Print):October 1,…
Polycrystalline material obtained from the ground single crystal of BiFeO3 reported as not having the superstructure, shows the superstructure reflections in neutron diffraction pattern. Tle determined magnetic moment of antiferromagnetically ordered Fe 3+ ions is Fe = (3.700.03)B at 293 K.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, Structures, and Thermal Properties of Heterometallic Copper(II)-Alkaline-Earth Metal Complexes with 1,3-Bis(dimethylamino)-2-propanolato (bdmap) and Trifluoroacetato as Ligands: CaCu(bdmap)2(O2CCF3)2(H2O), Sr2Cu2(bdmap)4(O2CCF3)4, and Sr2Cu4(bdmap)6(O2CCF3)4(.mu.3…
Abstract The dynamic rheological properties of poly(etherimide)/poly(etheretherketone)/liquid crystalline polymer (LCP) ternary blends were measured in order to correlate these properties with the morphology obtained after extrusion. The viscosity radio, η d /η m , where η d = disperse phase viscosity and η m = matrix…
The existence of a regime of constant-loss (independent of frequency) behavior was reported earlier, based on ac conductivity measurements at low temperatures and/or high frequencies, for a wide range of ionically conducting crystalline materials and glasses. Here new results in support of this concept are presented.…
We have successfully grown epitaxial GaSe films on GaAs(111), (001) and (112) by molecular beam epitaxy. On the GaAs(111) substrate, the c -axis of the GaSe layer was perpendicular to the substrate surface, while each unit layer of GaSe was inclined on GaAs(001) and (112) substrates when the growth temperatures were h…
Abstract A conductometric glucose sensor was fabricated by coating a twin-microband electrode with a bilayer of a membrane composed of polyaniline and glucose oxidase/gluconolactonase films. The enzyme-catalyzed hydrolysis of glucose induces a change in the conductivity of the pH-sensitive polyaniline film. The conduc…
The elevated‐temperature mechanical behavior of two low‐density fibrous ceramic thermal insulators is discussed. Fracture toughness and R ‐curve behavior are obtained from chevron notched bend bar and short double cantilever beam specimens, respectively. The fracture behavior is related to the bulk microstructures, th…
Abstract The Raman spectra of solutions of poly( N ‐vinyl‐2‐pyrrolidone) (PVP; M̄ w = 1 000, 10 000, 40 000 and 360 000) in D 2 O and dimethyl sulfoxide (DMSO) were measured at various concentrations. PVP is hydrated by D 2 O in a manner different from N ‐ethyl‐2‐pyrrolidone (NEP) and N ‐methyl‐2‐pyrrolidone (NMP), mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate Constant and Activation Energy Measurement for the Reaction of Atomic Hydrogen with Methanol, Iodomethane, Iodoethane, and 1-Iodopropane in Aqueous SolutionStephen P. Mezyk and David M. BartelsCite this: J. Phys. Chem. 1994, 98, 41, 10578–10583Publication Date (Print):O…
Synthetic single-crystals of zircon [(100) growth surfaces] were implanted at 77K with 540 keV Pb ions with fluences of 3.3 × 1011 to 5 × 1015 ions/cm2 —a dose range that completely spans the crystalline-to-amorphous transition as determined by Rutherford backscattering/ion-channeling measurements. A chemically unzone…