Materials Literature
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Model catalyst systems have been prepared by growth of small metal aggregates on thin well ordered oxide films of alumina and silica. These systems lend themselves to structural and morphological characterization via scanning probe microscopies and transmission electron microscopy and bridge to a certain extent the ma…
The highest nonlinear optical bulk efficiency for a 2-(4-nitrophenyl)ethenylferrocene (140 times that of urea) has been achieved for E-4 owing to a favourable noncentrosymmetrical packing in which all molecules are perfectly aligned (P1 space group).
A study of the magnetization of the antiferromagnetic magnetoelectric crystal LiCoPO4 as a function of temperature and the strength of a magnetic field oriented along the antiferromagnetic vector reveals features due to the presence of a weak ferromagnetic moment. The value of the magnetic moment along the b axis at 1…
We fabricated new polymer-stabilized ferroelectric liquid crystal displays (PS-FLCDs) by UV photocure of doped monoacrylates with a mesogenic side chain at a temperature where the LC medium is in the SmC * phase under the application of a bipolar square-pulsed AC electric field. Then, we investgated the effect of poly…
The extrusion foaming process involves several critical steps, in which the physical foaming agent plays a significant role: plasticization, solubility, nucleation and bubble growth. Although these aspects can be studied by different techniques, a novel method based on ultrasonic sensors has proven to provide valuable…
The relation of PVA/SF blending ratio and freezing temperature with the morphology, fine structure and properties of porous PVA/SF blend membranes prepared by means of freeze drying was investigated. It was indicated that the pore diameter of the blend membranes remarkably decreased and the pore density obviously incr…
Highly stable silicas characterized by narrow pore size distribution in the macroscale range have been synthesized using a novel and simple route based on sedimentation–aggregation of monodisperse polystyrene (PS) beads. The network of macropores and macrowindows is preserved upon calcination up to 900 °C. The Figure…
The mobilities of grain boundaries is a key factor in determining the evolution of polycrystalline microstructures. In most cases, the intrinsic boundary mobility is strongly affected by the presence of impurities. We present a series of simulations of grain-boundary migration in systems without impurities, with stati…
Abstract Herein we report chemical and electrochemical formation of poly(3‐methoxyethoxythiophene) and its copolymers with aniline, thiophene and pyrrole which give highly conducting polymeric materials. These are soluble in common organic solvents in the conducting state. The response mechanism of these compounds, to…
Poly(propyleneimine) dendrimers with stearyl end groups are investigated as inverse micelles in toluene. While the initial dendrimers have a spherical structure with a collapsed core, solubilization of metal salt hydrate leads to the formation of cylindrical multidendrimer structures with swollen, metal-salt-filled de…
A model description for the evaporation kinetics from glass melts in direct contact with static atmospheres or flowing gas phases is presented. The derived models and equations are based on the solution of the second Ficks’ diffusion law and quasi‐steady‐state mass transfer relations, taking into account changing melt…
What is happening when a soap bubble floats on the air? How do bubbles coalesce to form beautiful three-dimensional clusters? The physical-based model and animation described herein provide the answers. This paper deals with a complete computer simulation of soap bubbles from a dynamic perspective, which should prove…
Phase separation in a sol–gel process of SiO 2 –ZrO 2 in the presence of polyethylene oxide is investigated. An amorphous gel with interconnected macroporous morphology is obtained when phase separation and sol–gel transition concur to fix a transitional structure of spinodal decomposition. Macropore size, together wi…
We report the preparation and characterization of viologen-functionalized generation 2, 4, and 6 poly(amidoamine) (PAMAM) dendrimers. An amidation reaction between the succinimide ester of 1-ethyl-1‘-(3-propionic acid)-4,4‘-bipyridylium dibromide and the dendrimer primary amines resulted in 13−34% end group functional…
Adhesion behavior of chemical vapor deposited (CVD) copper (Cu) films on various barrier substrates was studied using a pull-off test. The mean adhesion strength of Cu films on air-exposed physical vapor deposition (PVD) Ta, air-exposed CVD TiN, in situ PVD TiN, and in situ CVD TiN were determined to be 3.42, 4.74, 4.…
Organic frameworks have tempting properties for nanostructured heterogenous catalysts with active sites that are size- and pH-tunable, yet working examples are sparse. The authors present a promising structure type, i.e., cross-linked assemblies of lyotropic liquid crystals (LLCs), whose polar termini form ordered cha…
A homogeneous stress field imposed on a polycrystalline sample containing elastically anisotropic crystallites produces an inhomogeneous strain field. The average strain causes a shift of the diffraction-line position, and the variance of the strain is a measure of line broadening. Though the shift of the line is comm…
The new charge-transfer salt β‘ ‘-(BEDT-TTF)4[(H3O)Cr(C2O4)3]S, where BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene and S = CH2Cl2, has a broad metal−insulator transition at approximately 150 K. This differs from similar salts in the BEDT-TTF tris(oxalato) metalate series, notably the superconducting materials with…
Transparent inorganic oxide coatings on polymers are playing an increasingly important role in pharmaceutical, food, and beverage packaging, and more recently in encapsulation of organic, light-emitting display devices. Such coatings are being prepared by physical or by chemical vacuum-deposition methods. They possess…
Local tumor therapy using focused ultrasonic waves may become an important treatment option. This technique exploits the ability of mechanical waves to induce thermal and nonthermal effects noninvasively. The cytotoxicity to cultured cells and biological tissues in vivo that results from exposure to ultrasonic shock w…