Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Sonolysis is one of the techniques to destroy various organic contaminants in dilute aqueous solutions. The purpose of this study was to examine the effect of alumina particles on the enhancement of sonolysis. Chlorobenzene was chosen as the model organic compound and batch experiments were carried out with 20 kHz ult…
A suite of zwitterionic pyridylidene-based merocyanines that contain no interconnecting π-bridge between the donor and acceptor rings has been synthesised and their second-order NLO properties evaluated largely by semi-empirical computational methods (MOPAC 97/AM1). Contrary to expectation, increasing the degree of in…
The synthesis of the first alkynyl core-modified porphyrin building block, 5,10,15,20-tetrakis(4-ethynylphenyl)-21,23-dithiaporphyrin (N2S2 core), is reported. The building block was used to construct donor-appended dithiaporphyrin systems under mild palladium-coupling conditions. The porphyrin building block appended…
Multilevel diffractive optical elements are necessary for achieving high-efficiency performance. Here the diffraction efficiency of a multilevel phase-only diffractive lens is analyzed. Approximate, as well as more accurate, approaches are presented. Both plane-wave and Gaussian illumination are discussed. It is shown…
Abstract Hybrid density functional theory (DFT) and post‐Hartree–Fock methods are compared by depicting potential energy curves of the O–O dissociation of hydroperoxide and the M–O dissociation of transition‐metal oxides. The former approach includes BLYP, B2LYP, B3LYP, and more general hybrid DFT methods, while the u…
A FTIR spectroscopy study on the surface reactivity of calcined layered double hydroxides (LDH), with different cations in the interlayer space (namely, carbonate, nitrate, silicate, and borate), for isopropanol oxidation is reported. The LDHs were previously calcined at 600°C and then their surface acidity was quanti…
Comparative solid state structural studies of three lanthanide macrocyclic complexes derived from 1,4,7,10-tetraazacyclododecane with pendant arms bearing amide co-ordinating groups have been performed in order to evaluate the parameters influencing the co-ordination polyhedron and to assess the importance of the geom…
The fine fractions (<2 µm) of four bentonites, in which the dominant minerals were Al-rich montmorillonites of various chemical compositions, have been Li-saturated. The admixtures identified in the fine fractions include pyrophyllite in Otay (USA), amorphous SiO2 in Ivančice (Czech Republic) and opal CT in Sarigus (A…
A superlattice of silver nanoclusters was prepared using sequential self-assembly of 1,5-pentanedithiol on an Au(111) substrate. The formation of highly ordered silver nanocluster arrays was confirmed using AFM and also by the longitudinal periodicity observed in the low angle X-ray diffraction pattern. In contrast to…
Abstract A classical interaction model for the calculation of molecular polarizabilities has been investigated. The model is described by atomic capacitancies, polarizabilities, and a parameter related to the size of the atom, where one set of parameters has been employed for each element. The model has been parameter…
A perfluorinated derivative of phthalocyanine was synthesized as the free base, hexadeca-(2,2,2-trifluoroethoxy) phthalocyanine (H2F48Pc), and as a zinc complex, hexadeca-(2,2,2-trifluoroethoxy)-phthalocyaninatozinc (ZnF48Pc), and their spectroscopic and photochemical properties were studied. The absorption bands are…
The corrosion behaviors of a commercial Ni-Ti alloy orthodontic wire and a polished plate with same composition in 0.9% NaCl and 1% lactic acid solutions were examined using an electrochemical technique, an analysis of released ions, and a surface analysis by X-ray photoelectron spectroscopy (XPS). The effect of polis…
A simple and efficient method has been employed to prepare a Mg-rich Mg–Ni–Nd alloy which exhibits a substantially large hydrogen storage capacity with excellent absorption/desorption kinetics at moderate temperatures. This method consists of fully melting raw materials in a sealed steel crucible filled with Ar and su…
The emission spectra of were analyzed by Gaussian peak fitting. The emission mainly can be attributed to the transitions of 5d to and of ions. A weak peak at ∼460 nm arises from an independent luminescent center. Both the luminescent intensity and the peak height ratio are affected by content. For choosing an optimize…
The influence of molecular structure on the rheology and processability of blow-molding grade high-density polyethylene (HDPE) resins is studied using capillary and extensional rheometers, a melt indexer, and a blow-molder unit. Twenty-four commercial HDPE resins were analyzed in terms of their shear and extensional f…
In the recycling of the permanent Nd–Fe–B magnet, the carbon such as free carbon and carbides at the grain boundary segregation in the magnet scrap are elements that are harmful and which obstruct the magnet performance. The removal of the carbon is currently a major problem. Remelting of scraps should, therefore, be…
The structural integrity of the oxysulfide material, before and after charge-discharge cycling at high temperature was studied by X-ray diffraction and high-resolution transmission electron microscopy. The rock salt phase which is associated with capacity loss has been detected at the surface of the oxysulfide particl…
Structured polymer fibers with diameters down to tens of nanometers are of interest for applications in filters, in composite reinforcement, or as templates for the preparation of functional nanotubes. The Figure shows fibers of poly-L-lactide produced by electrospinning from a dichloromethane solution exhibiting regu…
The instabilities of Si3N4 and Si3N4 ceramics during sintering were reviewed. As a result of the instabilities, Si3N4 and Si3N4 ceramics lose their masses or decompose. The major mass loss reaction of Si3N4 ceramics is as follows.Si3N4(s)+3SiO2(l)=6SiO(g)+2N2(g)Regarding mass loss, decreasing the sintering temperature…
An array of iron nanowires within polyaniline nanotubules was obtained using a two-step template synthesis. First, an array of polyaniline nanotubules was synthesized in an alumina template, and then it was used as a “second-order template” for electrodeposition of iron within the polyaniline nanotubules. The polyanil…