Materials Literature
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The behavior of ammonia absorption and desorption was studied for CaCl 2 −CaBr 2 halide mixtures with various molar ratios prepared via the aqueous solution method. The CaCl 2 −CaBr 2 halide mixture was revealed to form solid solutions in any molar contents. Ammonia absorption abruptly increased at some pressure, form…
A series of N-confused tetraphenylporphyrins (H(2)NCTPPs) with substituents on either the para- or the 3,5-positions of the meso phenyl rings were prepared using Lindsey conditions. Both electron-withdrawing and electron-donating groups were chosen in order to probe the effects of peripheral substitution on the proper…
The idea of combining the anisotropic behaviour of liquid crystalline materials with the properties of macromolecular systems was first suggested by Onsanger and subsequently Flory. The actual realization that such systems could exist came from studies of natural polymers such as the tobacco mosaic virus. Interest in…
Both zero-point and classical thermal effects on the chemical shift of transition metals have been calculated at appropriate levels of density functional theory for a number of complexes of titanium, vanadium, manganese and iron. The zero-point effects were computed by applying a perturbational approach, whereas class…
We propose an extension to the phenomenological thermodynamic Landau-Devonshire theory to include the contribution of inhomogeneous strains caused by lattice defects to the Gibbs free energy. The model yields correction terms for dielectric and ferroelectric quantities as a function of both elastic misfit strain and d…
Pressure-induced phase transitions in ${\mathrm{Eu}}_{2}{({\mathrm{MoO}}_{4})}_{3}$ single crystals were studied by fluorescence spectroscopy in the range of ambient pressure to $10\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The spectral range investigated was limited to the $^{5}D_{0}\ensuremath{\rightarrow}^{7}F_{J}$,…
Abstract The role of rigid particle size in the deformation and fracture behavior of filled semicrystalline polymer was investigated with systems based on polypropylene (PP) and model rigid fillers [glass beads, Al(OH) 3 ]. The regularities of the influence of particle content and size on the microdeformation mechanis…
The methods of synthesis of new oxide compounds and thin-film materials based on the use of heteroepitaxy are considered. The thermodynamic model and the theory of the epitaxial stabilisation phenomenon are outlined, the role of thermodynamic and structure-geometric factors determining the possibility of epitaxial sta…
The variation with microwave frequency and temperature of previously reported anomalous peaks in the EPR spectra of ${\mathrm{Mn}}_{12}$-acetate, under large transverse fields, reveals that the molecular easy magnetization axes are tilted with respect to the global symmetry direction. More importantly, on the basis of…
[reaction: see text] Starting from diactylene diacarboxylic acids, we have synthesized a series of photopolymerizable organogelators that possess simple amide structures, different alkylene chain lengths, and either optically active or racemic 3,7-dimethyl-1-octylamine units. The alkylene chain length of these compoun…
Abstract The in situ microfibrillar blend of poly(ethylene terephthalate) (PET)/isotactic polypropylene (iPP) was fabricated through a slit die extrusion, hot stretch, and quenching process. The morphological observation indicates that while the unstretched blend appears to be a common incompatible morphology, the hot…
Approaches to the synthesis of functional nanocomposites based on zero-, one- and two-dimensional solid-state nanoreactors formed by zeolite cages, pores of mesoporous matrices, or interlayer cavities in layered compounds are considered. It is demonstrated that the use of solid-state nanoreactors opens up extensive op…
Two series of composite micro/mesoporous materials with different contributions of micro- and mesoporosity were prepared by dealumination and recrystallization of mordenite zeolite. The materials were characterized by X-ray diffraction, infrared spectroscopy, 27 Al magic angle spinning (MAS) NMR, nitrogen adsorption–d…
In-situ polymerization of 3-phenoxybenzoic acid in the presence of various amounts (1−30 wt %) of vapor-grown carbon nanofibers (VGCNF) was carried out in poly(phosphoric acid)/phosphorus pentoxide (PPA/P 2 O 5; 1:4 w/w) medium. 3-Phenoxybenzoic acid polymerizes via Friedel−Crafts acylation in PPA to form poly(oxy-1,3…
Silver nanoparticles were synthesized by the use of a two-armed polymer with a crown ether core [poly(styrene)]-dibenzo-18-crown-6-[poly(styrene)] based on the flexibility of the polymer chains and the complex effect of crown ether with Ag(+) and Ag. The size of silver nanoparticles could be tailored by controlling th…
Abstract A series of polymer–clay nanocomposite (PCN) materials consisting of organic poly(methyl methacrylate) (PMMA) and inorganic montmorillonite (MMT) clay platelets were prepared successfully by the effective dispersion of nanolayers of the MMT clay in the PMMA framework through both in situ emulsion polymerizati…
The following paper pretends to analyze different processes in order to lightweighters gypsum as an alternative way at the cellular fillers addition, in order to establish the most suitable ones for the manufacture of plasterboard. Outstanding the process which uses foamings addition to lighten gypsum uses nowdays onl…
We report a bistable organic memory made of a single organic layer embedded between two electrodes, we compare to the organic/metal nanoparticle/organic tri-layers device [L.P. Ma, J. Liu, and Y. Yang, Appl. Phys. Lett. 80, 2997 (2002)]. We demonstrate that the two devices exhibit similar temperature-dependent behavio…
pH-Sensitive bipolar ion-permselective films of polyelectrolyte multilayers were prepared by layer-by-layer (LbL) assembly and photo-cross-linking of benzophenone-modified poly(acrylic acid) (PAA-BP) and poly(allylamine hydrochloride) (PAH-BP). The multilayer structure and ionizable group composition was finely tuned…
The review surveys different aspects of chemical studies of semiconducting clathrates belonging to a unique family of inclusion compounds. The classification, crystal and electronic structures, properties and methods for the synthesis of semiconducting clathrates are considered on the basis of analysis of recent publi…