Materials Literature
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Novel organoarsenic polymers, poly(vinylene-arsine)s, were synthesized by a free-radical alternating copolymerization of phenylacetylene with cyclooligoarsines as an atomic biradical equivalent. The polymerization between pentamethylpentacycloarsine (1a) or hexaphenylhexacycloarsine (1b) with phenylacetylene (2) in th…
Depth, number, and shape of the basins of the potential energy landscape are the key ingredients of the inherent structure thermodynamic formalism introduced by Stillinger and Weber [F. H. Stillinger and T. A. Weber, Phys. Rev. A 25, 978 (1982)]. Within this formalism, an equation of state based only on the volume dep…
Abstract A novel process for synthesizing nylon‐6 and poly(ϵ‐caprolactone) by microwave irradiation of the respective monomers, ϵ‐caprolactam and ϵ‐caprolactone, is described. The ring opening of ϵ‐caprolactam to produce nylon‐6 was performed in a microwave oven by the forward power being controlled to about 90–135 W…
Large-pore mesoporous materials were synthesized by incorporating alkanes as swelling agents during micellar solution preparation. The effect of the number of carbon atoms of the alkane on the properties of the final products has been investigated. The optimal swelling effect is obtained with decane, and the largest p…
The crystallization of calcium oxalate in aqueous solutions of a double-hydrophilic block copolymer poly(ethyleneglycol)- block -poly(methacrylic acid) (PEG- b -PMAA) has been investigated, focusing on morphological control of the calcium oxalate dihydrate (COD) crystals. It has been shown that with increasing polymer…
In an attempt to determine the electron configuration of (anion)iron corrolates, i.e., whether they are S = 1 Fe(IV)-corrolate(3-) or S = 3/2 Fe(III)-corrolate(2-*), with antiferromagnetic coupling between the iron and macrocycle electrons to yield overall S = 1, two axial ligand complexes of an iron octaalkylcorrolat…
The size-broadened profile given by the lognormal and gamma size distributions of spherical crystallites is considered. An analytical approximation for the size-broadened profile is derived that can be analytically convolved with the strain-broadened and instrumental-broadened profiles. The method is tested on two CeO…
The new anhydrous borate Na2Co2B12O21 has been synthesized by flux methods and studied by single-crystal X-ray diffraction (space group I2/a with a = 17.1447(15) A, b = 4.5530(5) A, c = 19.4408(15) A, beta = 103.212(5) degrees , V = 1477.4(2) A3, Z = 4). Refinement of its structure reveals it is the first metaborate e…
We report the calculation of paraconductivity in carbon nanotubes above the superconducting transition temperature. The complex behavior of paraconductivity depending upon the tube radius, temperature and magnetic field strength is analyzed. The results are qualitatively compared with recent experimental observations…
The maximum pressure a two-dimensional surfactant monolayer is able to withstand is limited by the collapse instability towards formation of three-dimensional material. We propose a new description for reversible collapse based on a mathematical analogy between the formation of folds in surfactant monolayers and the f…
First-order field-induced spin reorientation transitions in multisublattice intermetallic compounds are considered within an anisotropic Heisenberg model. Unlike previous works, only leading-order anisotropy constants of the sublattices are included. The exchange interactions both between the rare-earth (RE) and trans…
The computer program WinXPRO enables the calculation of crystal and molecular properties using the multipole parameters of the electron density. The list of properties includes the electron density and its topological and electric field characteristics, the local kinetic and potential energies, the electron localizati…
To address the need for bioactive materials toward clinical applications in wound healing and tissue regeneration, an artificial protein was created by recombinant DNA methods and modified by grafting of poly(ethylene glycol) diacrylate. Subsequent photopolymerization of the acrylate-containing precursors yielded prot…
The temperature dependence of magnetic anisotropy was investigated for c-plane-oriented MnSb sputtered films. The main results were as follows: (1) A MnSb phase with low Mn contents between 50.1 at. % and 50.8 at. % was formed in c-plane-oriented MnSb films. (2) It was clarified that the perpendicular magnetic anisotr…
Abstract The thermal decomposition of poly[diethyl 2‐(methacryloyloxy)ethyl phosphate] (PDMP) by free‐radical polymerization was studied by the combination of pyrolysis‐gas chromatography/mass spectrometry (Py‐GC/MS) with thermogravimetric analysis/mass spectrometry (TG/MS), in which the former identified directly the…
The dielectric relaxation of thick (∼50 μm) films of WO3 was investigated from 10 Hz to 1.8 GHz at a temperature of 200 °C. Three separate measurement techniques were employed: time-domain discharge voltage measurement, frequency-domain impedance measurement, and frequency-domain reflection coefficient measurement, wi…
Studies of photoinduced magnetization and photoinduced absorption in molecule-based magnet Mn(TCNE)x⋅y(CH2Cl2) (x≈2, y∼0.8, TCNE=tetracyanoethylene) are reported. Optical excitation in the blue region of spectrum leads to increased magnetization, accompanied by changes in the electronic spectrum. These effects are pre…
To further elucidate the nature of the valence state of V ions in vanadate glasses, magnetic susceptibility measurements in the temperature range of 5 to 300 K have been performed on a series of vanadium–strontium–borate (V2O5+SrO+B2O3) oxide glasses with V2O5 concentrations greater than 50 mol %. The magnetic suscept…
Ultrafine CoFe1.9RE0.1O4 (RE=Gd, Nd) powders have been fabricated by a sol-gel method. Magnetic and structural properties of the powders were investigated by x-ray diffractometer, Mössbauer spectroscopy, and vibrating sample magnetometer. The CoFe1.9Gd0.1O4 powders that were fired at and above 923 K contained only a s…
In RCu2 compounds (R=rare earth) magnetostriction results from two different sources, the single ion crystal field contribution and the two ion exchange interaction. The crystal field contribution can also be observed above the magnetic ordering temperature and leads to giant magnetostriction in high magnetic fields a…