Materials Literature
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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…
A series of copolyamides 12.y was synthesized either with y = 6, or 1,4-cyclohexanedicarboxylic acid (1,4-CHDA) residue, or a mixture of both. The influence of the synthetic route of 1,4-CHDA containing polyamides on the obtained cis–trans ratio of the incorporated 1,4-CHDA was investigated. The use of acid chlorides…
Macro-scale supramolecular fibers composed of hydrogen bonded pseudo-polymer chains of guanosine derivatives were fibricated, and physical properties of the fibers were investigated.
Propeller-shaped molecules based on a triphenylbenzene crux bearing three oligomeric phenylenevinylene branches have been designed; very large first-order hyperpolarisabilities (up to ∥β∥ = 800 10−30 esu) were obtained while maintaining wide transparency in the visible region by taking advantage and boosting of intram…
Metatungstate salts α-[R4N]5H[H2W12O40] (R = Pr or Bu) were produced by phase transfer methods. Two one-electron reduction processes (E1/2 −1100, −1590 mV versus Ag–AgCl (saturated KCl in MeCN)) are seen for [Bu4N]5H[H2W12O40] in MeCN (Bu4NClO4, 0.1 M) solution. They convert into a single two-electron process in MeCN–…
Ti-rich Ti–Ni thin films of Ti–45.2, 46.1, 47.0, 47.9, 48.5 at%Ni were prepared by sputtering. The sputter-deposited thin films were annealed at 773, 823 and 873 K for 1 h. Transmission electron microscopy revealed that Ti–45.2 at%Ni thin films contain randomly oriented Ti2Ni particles, while the other films contain T…
Photosensitive polyimides (PSPIs) are attracting much attention as an insulating materials for microelectronic applications. PSPIs can be directly patterned, simplify processing steps and do not need a photoresist to be used in the micro-lithographic stage, nor a toxic etchant. This review introduces the recent develo…