Materials Literature
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Abstract This study presents the electromagnetic wave propagation through the frequency-dispersive and lossy double-negative slab embedded between two different semi-infinite media. The double-negative slab is realized by using two models, the Lorentz and Drude medium models. The properties and the required equations…
The reaction boundary between boron nitride (BN) and nickel (Ni) metal was studied at high pressures (HP) of 4.5–6 GPa in the high temperature (HT) 1300–1900 °C region. It can be seen that Ni dissolves BN followed by the precipitation of BN crystals under HP and HT. Full conversion from hexagonal BN (hBN) to cubic BN…
Sol-gel-derived (Ba0.65,Sr0.35)TiO3 (BST) thin films were etched in CF4∕Ar and CF4∕Ar∕O2 plasmas using magnetically enhanced reactive ion etching technology. Experimental results show that adding appropriate O2 to CF4∕Ar can better the etching effects of BST films for the increase of etching rate and decrease of etche…
New types of asymmetrical photochromic diarylethene derivatives having a pyrazole unit, namely 1-[1,3,5-trimethyl-1-pyrazol-4-yl],2-[2-methyl-5-(4-methoxylphenyl)-1-thien-3-yl]perfluorocyclopentene (1a), 1-[1,3,5-trimethylpyrazol-4-yl],2-[2-methyl-5-(3-methoxylphenyl)-1-thien-3-yl] perfluorocyclopentene (2a), 1-[1,3,5…
A procedure based on infrared reflection absorption spectroscopy integrated with a quartz crystal microbalance has been developed and used for comparison of initial atmospheric corrosion of copper induced by formic, acetic, and propionic acid. The absolute mass of individual constituents of corrosion products formed,…
A facile and rapid method of covalently modifying the surface of graphite powders with aminophenyl groups is described. This chemical modification strategy allows the production of bulk (gram) quantities of amino-modified carbon powder. 4-Nitrophenyl groups are covalently attached to graphite powder via the chemical r…
Tris(N-salicylideneaniline)s comprising chiral tails in varying numbers self-organize into a room temperature helical columnar mesophase resulting from the chiral stacking of the constituent molecules differing in their rotational symmetry and ratio as evidenced by optical, chiroptical, calorimetric and X-ray studies.
The deformation microstructure and texture have been characterized by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) through the thickness of high purity (99.99% purity) aluminum sheets processed by accumulative roll-bonding (ARB) up to a total strain of 4.8. This processing route c…
Cerium-activated polyphosphates MGd(PO3)4 (M = Li, Na, K, Cs), were synthesized by a solid-state reaction technique at high temperature. The ultraviolet (UV) and vacuum ultraviolet (VUV) luminescence spectra of this series of samples were determined at room temperature (RT). On the basis of the VUV excitation spectra…
Surfactants are usually used for the preparation of emulsions; however, some have an adverse effect on the human body such as skin irritation, hemolysis, and protein denaturation, etc. In this study, we examined the preparation and formation mechanism of n-alkanol/water emulsions using alpha-cyclodextrin (alpha-CD) as…
Core-silica shell nanoparticles were prepared in a "reverse" manner by nucleation and growth of Au cores within hollow silica nanospheres.
A mathematical model for the simulation of the selective catalytic reduction of NO x by ammonia in diesel exhaust is presented. The simulation of heat and mass transfer, and flow phenomena in a monolithic catalytic converter is performed by a previously published mathematical model. The chemical phenomena are describe…
The 2-dicyanomethylidene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF) group has been identified as a particularly strong acceptor suitable for the realization of highly efficient second-order NLO chromophores. To provide guidelines for a further improvement of heterocyclic acceptors, we present Sum-Over-States (SOS)…
Single-walled carbon nanotubes (SWNTs) have had significant impact on the development of gas sensors in the last decade. However, useful applications of SWNTs are limited by the lack of manufacturable routes to device formation. This Highlight article chronicles recent progress in this area and demonstrates the great…
The new square-planar platinum-diimine-dithiolate compounds [Pt(mesBIAN)SS] have been synthesised {mesBIAN = bis(mesityl)biazanaphthenequinone; SS = 1,2-dithiooxalate (dto) , maleonitriledithiolate (mnt) , 1,2-benzenedithiolate (bdt) , 3,4-toluenedithiolate (tdt) and 1,3-dithia-2-thione-4,5-dithiolate (dmit) }, and th…
ZnO microstructures were fabricated by wet-chemical etching with aqueous solutions of HCl and and patterned resist masks prepared by electron-beam lithography. Anisotropy of the etching rate caused the formation of microstructures corresponding to the crystal habit. In fact, all the pit structures made on , , and surf…
The surfaces of medical materials are coated with polymer molecules or drugs in order to functionalize the surfaces in such ways as imparting biocompatibility. But in the case of inorganic materials there is the problem that polymers will have poor adhesiveness and be liable to peel. A coronary artery stent holds the…
Interfacial thermal resistance is an important factor that has a considerable effect on the thermal conductivity of composites, especially nanocomposites, and must therefore be considered when developing new composites for various structural and nonstructural applications. However, reported data on interfacial thermal…
Crystallization is often used in the pharmaceutical industry for purification and isolation of drugs, and also as a means of generating polymorphs or isomorphs. The aim of this study was to investigate the role of extrinsic crystallization parameters on the crystallized product, with special emphasis on improving the…
Submicron single crystals of ZnO were grown by spray pyrolysis: the mist of an aqueous solution was generated by ultrasonic agitation and then pyrolyzed on a heated glass substrate. Hexagonal platelets of ZnO 10–90 nm thick were obtained when ammonium acetate was incorporated into the precursor solution of zinc acetat…