Materials Literature
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We describe a simple, yet phenomenologically very different, low-temperature modification to the conventional metal–organic chemical vapor deposition. It has been applied to the epitaxy of hexagonal-phased Bi2Te3/Sb2Te3 superlattices on zinc-blende GaAs substrates. The modification enables a two-dimensional, layer-by-…
Patterned growth of freestanding carbon nanotube(s) on submicron nickel dot(s) on silicon has been achieved by plasma-enhanced-hot-filament-chemical-vapor deposition (PE-HF-CVD). A thin film nickel grid was fabricated on a silicon wafer by standard microlithographic techniques, and the PE-HF-CVD was done using acetyle…
In this article, the curing kinetics of two fast cure flip-chip epoxy encapsulants under both isothermal and nonisothermal conditions are investigated by differential scanning calorimetry. The method allows determination of the most suitable kinetic model and corresponding parameters. The kinetic analysis suggests tha…
Ring-opening polymerization of ε-caprolactone (CL) has been initiated with rare earth phenyl compounds in both bulk and solution. These rare earth phenyl initiators can give polycaprolactone (PCL) with high yield and high molecular weight. The polymerization mechanism is through a coordination-deprotonation-insertion…
Vein grafts are subject to increased tensile stress due to exposure to arterial blood pressure, which has been hypothesized to induce endothelial cell (EC) and smooth muscle cell (SMC) injury. This study was designed to verify this hypothesis and to develop a tissue engineering approach that can be used to prevent the…
We study thin, symmetric AB-copolymer films between neutral walls using the bond fluctuation model. Near the surface, the monomer distribution with respect to the chains’ center of mass is nonisotropic: The chains flatten on the surface. The resulting A- and B-lamellae have interfaces practically perpendicular to the…
Stability against deprotonation of polyaniline–polyamide 6 blends processed from formic acid can be significantly improved by the addition of a supporting protonating agent to the processing solution such as phenylphosphonic acid, camphorsulfonic acid, 2-acrylamide-2-methyl-1-propane sulfonic acid, or dibutyl phosphat…
Novel surface modifying macromolecules (SMMs) were developed for incorporation into polyethersulfone (PES) membranes, intended for pervaporation applications. These materials were synthesized with a diisocyanate, polypropylene oxide (PPO), and a fluoro-alcohol, and characterized for elemental analysis, molecular weigh…
The phase diagram of adsorbate-induced row-type-alignments, such as missing-row reconstructions induced by adsorbate-atoms on the FCC(110) surface, is calculated by the Blume-Emmery-Griffiths (BEG) model. In the model, we introduce adatom-adatom and dipole-dipole interactions between nearest-neighbor (NN) and next-nea…
Lithiophorite with a sandwich layered structure, which consists of stacked MnO 6 octahedral sheets and LiAl 2 (OH) 6 octahedral sheets, was prepared from a birnessite-type sodium manganese oxide with a layered structure, by using a hydrothermal soft chemical process. In the first step, lithium−aluminum hydroxide compl…
Whether interfacial tension between two molten polymers can be reduced significantly by the formation of copolymer at the interface by chemical reaction of functionalized chains is the question addressed by this paper. To answer it, model experiments are carried out by grafting of benzylamine end-functionalized deuter…
The interconnection between photostimulated formation and destruction of defect centers (F- and V-type color centers) and surface photochemical reactions taking place on the surface has been examined for a series of 21 wide band gap metal-oxide specimens, which comprise insulators and semiconductors whose band-gap ene…
Layer-by-layer polyelectrolyte adsorption at colloid particle surfaces as well as the removal of the core latex to obtain multilayer microcapsules is conducted by means of membrane filtration. As target particles for adsorption we use nonsoluble polystyrene sulfate latex, soluble melamine formaldehyde resin latex, and…
Although the minimum energy conformation of the mesogenic molecule 4-n-pentyl-4′-cyano-biphenyl (5CB) is known to have an inter-ring torsional angle of 37.0° and an alkyl tail which lies perpendicular to the adjoining phenyl ring, less is known about the conformational properties of the alkyl tail. This paper investig…
Molten inorganic salt hydrates can be used to dissolve cellulose. According to the salt concentration molten salt hydrates are arranged between concentrated salt solutions and anhydrous melts. As new cellulose solvents molten LiClO 4 *3H 2 O and LiI*2H 2 O were found. Mixtures of LiClO 4 *3H 2 O with e. g. Mg(ClO 4 )…
The phenomenon of nanosized particle structuring and structural transitions due to confinement in thin liquid films is of considerable interest in both science and technology. Our recent experimental observations on thinning of single liquid films containing monodispersed nanosized colloidal particles with diameters v…
Perylenetetracarboxydiimide (PEDI) shows a unique fluorescence property. The dye is highly fluorescent in 3,3‘4,4‘-biphenyltetracarboxylic dianhydride (BPDA)-derived polyimide (PI) matrices but turns nonfluorescent in PIs from pyromellitic dianhydride (PMDA). The results can be explained in terms of a fluorescence que…
Room temperature green and red light emission under ultra violet radiation have been observed from CdS nanocrystals. The chemical route used suggested a size distribution of nanocrystallites and was confirmed by atomic force microscopy analysis. The red band photoluminescence is ascribed to the presence of CdO phase a…
The design and analysis of a dielectric guided-mode resonance filter (GMRF) utilizing a nonlinear material for the waveguide is presented. Small changes to the parameters of a GMRF have a large impact on its resonance. A nonlinear material can provide a small change in the refractive index of the waveguide, altering t…
The dynamic wetting of a commercial alkyl ketene dimer (AKD) wax was measured on model cellulosic surfaces. The variables investigated were temperature and the surface composition. The model surfaces consisted of cellulose and cellulose acetate films as well as glass. These surfaces are smooth by industrial standards…