Materials Literature
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The metathesis reaction of propene under photoirradiation was performed over two types of mesoporous silica materials, FSM-16 and MCM-41, and amorphous silica evacuated at high temperature. The activity increased with increasing evacuation temperature, and moreover, prehydration treatment before evacuation influenced…
Recently, Alves et al. have suggested a new orthorhombic lattice system as a possible form for the graphitic C3N4 model structure. For this new phase, some modifications in the electronic properties are expected with respect to the hexagonal variety previously proposed by Teter and Hemley. A theoretical investigation…
Many textile properties have traditionally been assessed using subjective methods dependent upon one or more of the human senses. It is generally accepted that these methods can be unreliable, and the development of more reliable and consistent objective measurement systems is a key objective for textile scientists. I…
Scaling of gold, bronze, and stainless steel was investigated in synthetic fresh and seawater. It is shown that the calcium carbonate precipitation rate increased from stainless steel, to bronze and then to gold whatever the composition of the scaling water. The morphology of the deposited scale depended on the substr…
MoO3/TiO2 catalysts prepared by impregnation of anatase with ammonium heptamolybdate have been investigated with the aim of understanding their redox chemistry and the coordination state of surface active species. Adsorption of ammonia has been followed by FTIR and by EPR on thermally treated, partially reduced sample…
The kinetics of thermal degradation of polyurethanes (PUR) has been studied by means of high-resolution and constant heating rate thermogravimetry (TG), under nitrogen and synthetic air atmospheres. The high-resolution TG provided a way to increase resolution with decreasing the time of data acquisition. In this mode,…
An electron‐transfer reaction takes place in the ground state between phthalocyanines (as electron‐donors) and pyrylium cations (as electron‐acceptors) in polar solvents, reaction which leads to the phthalocyanine radical‐cations as evidenced by its absorption spectra identical to the one of the species formed by elec…
Glucuronamide-based bolaamphiphiles are found to form a reversible, linear polymolecular array, via a boronate ester linkage attached to the 1,2-positions of the pyranose or furanose ring, upon complexation with an aromatic boronic acid-based homologue in aqueous solutions.
Recent years have seen a considerable development in the availability of single-crystal diffraction facilities with synchrotron radiation for use in non-biological crystallography, with access to several suitable beam-lines around the world. These can markedly extend the range of materials for which a full crystal str…
We have previously demonstrated that liposome encapsulation of doxorubicin (DOX) can alleviate adverse interactions with non-encapsulated DOX and the cyclosporine multidrug-resistant (MDR) modulator Valspodar. We have now investigated the behavior of different liposomal DOX formulations in MDA435LCC6/MDR-1 human breas…
The adsorption of ethylbenzene and styrene on well ordered epitaxial iron oxide model catalyst films with different stoichiometries was investigated using near-edge X-ray absorption fine structure spectroscopy (NEXAFS). On the iron-terminated Fe3O4(111) and α-Fe2O3(0001) surfaces chemisorption of ethylbenzene and styr…
Carboxylated nitrile rubber (XNBR) neutralized by metal oxide forms an ionic elastomer (ionomer) due to formation of ionic clusters by the metal carboxylated salt. Cluster formation in carboxylated nitrile rubber by metal oxide, mainly zinc oxide (ZnO), has been studied by infrared analyses. Two modes of plasticizatio…
The goal of this study was to improve our understanding of diamond growth reactors. Direct relationships were set up between key parameters at a microscale level and diamond film characteristics. The coupled action of plasma variables, such as microwave power density, substrate temperature, and percentage of methane,…
Characterization of Eu‐Doped Y 2 O 3 Nanoparticles Prepared in Nonionic Reverse Microemulsions in Relation to Their Application for Field Emission Display, Lee, Myung Han, Oh, Seong Geun, Yi, Sung Chul, Seo, Do Seok, Hong, Jin Pyo, Kim, Chae Ok, Yoo, Young Kil, Yoo, Jae Soo
The blocked isocyanate group (BHI) was synthesized to improve the storage stability of HI (2-hydroxyethyl methacrylate combined with isophorone diisocyanate) and characterized by Fourier transform infrared spectroscopy (FTIR). High-density polyethylene grafted with the blocked isocyanate group (HDPE-g-BHI) was used as…
Y2O3 ∶ Eu3+ phosphor particles were obtained by calcination of composite Y–Eu oxalate particles prepared in emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) systems. In the ELM systems, composite Y–Eu particles could be prepared by transporting either Y3+ and Eu3+ ions or oxalate ions from the ex…
We have carried out ab initio molecular orbital calculations on four isomers of ${\mathrm{Si}}_{9}{\mathrm{O}}_{25}{\mathrm{H}}_{14}$ modeling the local structure of ${\mathrm{SiO}}_{2}$ glass at the Hartree-Fock level. These clusters consist of two-, three-, four-, five-, and/or six-membered silica rings. The strain…
The mechanism of the acoustoplastic effect is discussed which arises when an oscillatory stress of an acoustic frequency is superimposed during quasi-static deformation of a crystal. The kinetics of the acoustoplastic effect and its dependence on the amount of plastic deformation, amplitude of acoustic-frequency stres…
We present results in the final part of a three-part study employing standard test data (STD) to estimate errors in peak parameters derived from data analysis procedures used in x-ray photoelectron spectroscopy (XPS). The XPS-STD are simulated doublet and singlet XPS spectra based on spline polynomial models of measur…
Vinylbenzyl chloride (VBC) has been used as a coupling agent in Convergent Living Anionic Polymerization to produce polymers with dendritic branching. The slow addition of a stoichiometric amount of VBC to living polystyrene chains allows the coupling to proceed through macromonomer formation followed by vinyl additio…