Materials Literature
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Cumene hydroperoxide (CHP) is normally produced by the cumene oxidation process. Severe fire and explosion incidents have occurred in oxidation and concentration processes due to the thermal instability of CHP. In this study, we used DSC and ARC thermal analysis techniques to measure the runaway thermokinetic data. Da…
Abstract— This paper analyses the validity of the fracture mechanics approach to hydrogen assisted cracking in metals on the basis of K ‐dominance over both the stress‐strain state and the accumulation of hydrogen in the fracture process zone. Stress‐strain assisted diffusion of hydrogen is considered as the rate cont…
One-dimensionally oriented thin crystals of a phenylene oligomer, p -sexiphenylene (6P), are grown on the poly( p -phenylene) (PPP) film prepared by the friction-transfer method. The 6P molecules tend to grow epitaxially on the (001) planes of alkali halides and the molecular axis is parallel to the <110> direct…
The effects of grain size on the tribological behavior of alumina were investigated. Alumina specimens with three different grain sizes, namely 4, 8, and 14 m, were used as pins and disks in a flat‐pin wear test in which the apparent contact area was maintained constant during the test. In contradiction with previousl…
The macroscopic magnetic properties of magnets strongly depend on the microscopic magnetisation processes and the microstructure of the magnets. Whereas ideally homogeneous magnetic materials exhibit a relatively simple and well understood magnetisation behaviour, more complex materials such as two phase composites or…
Using (110) ${\mathrm{NdGaO}}_{3}$ wafers as the lattice matched substrates, ${\mathrm{PbTiO}}_{3}$ thin films have been epitaxially grown by metal-organic chemical vapor deposition under reduced pressure. Highly resolved Raman spectra of the thin films have been recorded by a grazing-angle scattering technique. The E…
A new application of the atmospheric cold plasma torch has been investigated. Namely, the surface treatment of an air-exposed vulcanized rubber compound. The effect of plasma treatment was evaluated by the bondability of the treated rubber compound with another rubber compound using a polyurethane adhesive. The adhesi…
The optimized structure and spin-state energetics of the iron(ferric)−hexaaquo complex, [Fe(H 2 O) 6 ] 3+, in high ( S = 5/2), intermediate ( S = 3/2), and low ( S = 1/2) spin states were determined from a common starting structure using unrestricted Hartree−Fock (UHF), Møller−Plesset (MP2), and nonlocal density funct…
We have studied the dependence of the electro-optical properties of polymer dispersed liquid crystals (PDLC) on the ultraviolet (UV) cure of the solution of monomer and liquid crystal. The kinetics of UV polymerization and its effect on the morphology of the phase separated droplets of liquid crystal determine the swi…
Multicomponent Ga2O3–In2O3 films have been prepared by dc magnetron sputtering using targets with a Ga content [Ga/(In+Ga) atomic ratio] of 0–60 at. %. Transparent conducting thin films prepared with Ga contents up to about 40 at. % were identified as Ga-doped In2O3 (In2O3:Ga). A minimum resistivity of 5.8×10−4 Ω cm a…
A simple equation suitable for predicting the growth rate of a vapor bubble in uniformlysuperheated pure liquids and in binary solutions with a non-volatile solute was developed. The equation also improves on the popular pure-liquid bubble growth expression of Mikić et al. (International Journal of Heat and Mass Trans…
The readily available permanganate, KMnO 4, was successfully utilized in the synthesis of manganese oxide octahedral molecular sieve (OMS-1) with the todorokite type structure. The magnesium concentration in the starting materials was systematically varied to study the synthetic chemistry of Mg−OMS-1. The techniques s…
The analytic Polymer Reference Interaction Site Model (PRISM) theory of structurally and interaction symmetric Gaussian diblock copolymer fluids is reformulated, extended, and applied to make predictions for experimentally observable equilibrium properties of the disordered state. These include the temperature, degree…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Remarkable Catalytic Activity of Alkali-Metal Alkoxide Clusters in the Ester Interchange ReactionMatthew G. Stanton and Michel R. GagnéView Author Information Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 Ci…
The structures of fast ion conducting glasses in the system (AgI${)}_{\mathrm{x}}$-(${\mathrm{Ag}}_{2}$O-${2\mathrm{B}}_{2}$${\mathrm{O}}_{3}$${)}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ have been investigated using x-ray- and neutron-diffraction techniques. The contrasting scattering cross sections of the two technique…
Some new results on thermodynamic interactions in blends of model polyolefins are reported, including more examples of the anomalous attraction found earlier for polyisobutylene (PIB) blends. Small-angle neutron scattering (SANS) data demonstrate a significant suppression of concentration fluctuations in two polypropy…
Abstract Living cationic ring‐opening polymerization of ϵ‐caprolactone (CL), δ‐valerolactone (VL) and 1,3‐dioxepane‐2‐one ( 6 ) was achieved at room temperature by using zirconocene borate complex catalysts. Respective block copolymerization of CL with VL or with cyclic carbonate 6 was also successfully performed. The…
Abstract An analytical solution for the distribution of molecular weight, long chain branching and chemical composition of polyolefins produced under steady‐state conditions with the mechanism of terminal branching is derived. The model predictions agree well with Monte‐Carlo simulation results. This detailed descript…
Abstract Na2W4O13 with a layered structure possessed an energy gap between those of bulky WO3 and polyacid [Si(W3O10)4]4− photocatalysts and was active for photocatalytic hydrogen and oxygen evolution reactions in the presence of sacrificial reagents.
Abstract By using geometry optimizations with local density functional theory and double‐π plus polarization basis sets, an extensive study has been carried out on the molecular structures and stabilities of free‐base and metal‐complexed corrole isomers. The optimized structures of normal metallocorroles have been fou…