Materials Literature
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Abstract The electro‐optic performance of polymer‐stabilized liquid crystals (PSLCs) depends in a complex manner on the morphology of the stabilizing polymer network, mainly through elastic interactions between the liquid crystal and the network. The morphology of the polymer in turn depends on the preparation conditi…
We study the existence, uniqueness, and continuous dependence on initial data of the solution to the Cauchy problem and steady state solutions of a nonlocal Cahn-Hilliard equation on a bounded domain.
Stainless steel (SS) mirrors were exposed in the upper port of T-10 in front of the graphite limiter during the experimental campaign. Three mirrors were located at different distances from the plasma (22 cm, 45 cm, 66 cm), and three more were placed at 22 cm from the plasma inside a box that was opened at working dis…
In this paper, we simulate and fabricate diamond schottky rectifiers. The growth rate of pure diamond single crystal epitaxial is from 0.5 up to 100μm/hr with boron doping concentration around 1 × 1014 cm -3 to 1 × 1016 cm -3. A "liftoff" technology is used to provide the wafer. Theoretical calculation indicates that…
Nano-crystalline Co3O4 and CoO powders have been prepared by a spray pyrolysis approach. The effects of the reaction temperature and initial salts on the crystallinity and phase composition have been studied. Based on the TEM and XRD results, the crystal sizes were in the range of 1-10 nm. SEM and TEM observations als…
The atomic scale structures of two nanocrystalline K−Li−Mn−O−I materials obtained through Chimie Douce route in aqueous and acetone solutions have been determined using X-ray diffraction and atomic Pair Distribution Function technique. Both samples have been found to possess a layered-type structure, where the layers…
Aluminum plate surfaces having hydrophilic and corrosion-resistant properties are often required for various mechanical parts or systems. The conventional process for treating aluminum surfaces employs a series of wet processes: grease or organic compounds removal followed by drying, chromate process followed by dryin…
Nanocomposites have been prepared from a range of hyperbranched polymers (HBPs) and montmorillonite clays (MMTs) by solution processing. With high levels of exfoliation significant changes in rheological behaviour were observed. Rheological models for conventional filled polymers led to estimates of the effective part…
Abstract Guided by in vitro immunological tests, three immunomodulating steroidal glycosides, stemucronatosides A ( 1 ), B ( 2 ), and C ( 3 ), were isolated from the roots of Stephanotis mucronata. On the basis of chemical evidence and extensive spectroscopic methods including 1D and 2D NMR, their structures were dete…
Abstract The mixing of dry starch with 40 or 99% (v/v) formic acid (FA) produces an O ‐formylation reaction which causes a combination of acid hydrolysis and starch destructuration. Moreover, this esterification reaction is highly exothermic in the presence of pure FA. When O‐ formylation is performed at temperatures…
Numerous measurements were taken during the operation of a practical melt blowing slot die. On-line measurements were taken of the mean velocity and temperature of the air jets. Also, on-line measurements of fiber vibration amplitude were done. Off-line measurements were taken to determine fiber diameter distributions…
Abstract Mineralogical and chemical variations were studied in the upper half of a 1 m thick discontinuous bentonite bed interlaminated in the Lower Cenomanian sedimentary formations of the northern Aquitaine basin (France). X-ray diffraction patterns obtained from the <2 mm fraction in the Ca and K-saturated state…
Measurement of the stationary nucleation rate as a function of supersaturation in reactive precipitation requires that nucleation and growth of the crystals to an observable size take place under well-controlled hydrodynamic conditions and at a constant supersaturation. An experimental method was chosen that is based…
Carbon nanotubes were synthesised within the pores of an alumina membrane. The membrane had 200 nm diameter pores and 60 microm thickness, and ethylene was used as carbon source. Membrane dissolution by HF results in a bundle of parallel open tubes, aligned without macroscopic defects. The external diameter of the tub…
The formation of trigonal GdFe 3 (BO 3 ) 4 crystals in the Bi 2 Mo 3 O 12 -B 2 O 3 -Li 2 MoO 4 -Gd 2 O 3 -Fe 2 O 3 system was studied. The flux compositions for which GdFe 3 (BO 3 ) 4 is the high-temperature phase with a wide range of crystallization were determined. The features of nucleation of these crystals and th…
One possible failure mechanism of products containing polyimide dielectric is deadhesion of polyimide from neighboring metallization. Deadhesion usually occurs due to the combined damage mechanisms of environmental aging and fatigue. In this paper, the rate of aging of Kapton-E polyimide is quantified as a function of…
Comparing to conventional short-pulse (&lt;30ns) excimer laser annealing, the extended pulse (374ns) can provide sufficient thermal energy and time into the Pb(Zr1−xTix)O3 (PZT) thin film to complete the crystallization, whereas the bulk of the material remains at low temperature. In this study, thermal simulation…
In this paper, using wet chemical solution deposition processes, the (100)-highly oriented LaNiO3 buffer layers were grown on both silicon and platinized silicon wafers and, sequentially, the highly (100)-oriented PbZr1−xTixO3 thin films with various compositions were obtained on them. The misfit elastic strains were…
We outline the strategy and constraints adopted for the design of medium-power lead-alloy–cooled actinide-burning reactors that strive for a lower cost than accelerator-driven systems and for robust safety. Reduced cost is pursued through the use of (1) a modular design and maximum power rating to capitalize on an eco…
The roles of point defects and defect complexes governing nonradiative processes in ZnO epilayers were studied using time-resolved photoluminescence (PL) and slow positron annihilation measurements. The density or size of Zn vacancies (VZn) decreased and the nonradiative PL lifetime (τnr) increased with higher growth…