Materials Literature
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Highly porous poly(L-lactic acid)/apatite composites were prepared through in situ formation of carbonated apatite onto poly(L-lactic acid) foams in a simulated body fluid.The highly porous polymer foams (up to 95% porosity) were prepared from polymer solution by solidliquid phase separation and subsequent sublimation…
Large–strain plastic deformation at low homologous temperature implies, among other things, severe work hardening, strong crystallographic texturing, microstructural refining, and some degree of macroscopic redundant strain. In most cases, the development of texture does not seem to particularly increase grain interac…
The occurrence of a molecular complex between poly(ethylene oxide) (PEO) and p-dihydroxybenzene (hydroquinone) has been determined using different experimental techniques such as differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and Fourier transform infrared spectroscopy (FTIR). From DSC i…
This research discussed the effect of the addition of antimony catalyst on diethylene glycol (DEG) formation in poly(ethylene terephthalate) (PET) synthesis. It was found that antimony catalyst increased DEG formation in the preparation of PET, in particular, during the esterification stage and also during the prepoly…
We have investigated the magnetic correlations and low-energy magnetic excitations in a layered manganite La 1.2 Sr 1.8 Mn 2 O 7 which shows colossal magnetoresistance (CMR) behaviour. Our results confirm the coexistence of both ferromagnetic and antiferromagnetic correlations above T C ≈ 126 K. In addition we have di…
An anomalously large dielectric constant and a long relaxation time along the chain axis were first observed in the paraelectric phase of a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene. Dielectric, X-ray scattering and shear sound velocity studies consistently show that the anomalous phenomena…
We present state-of-the-art band-structure calculations for the $1T$ phase of ${\mathrm{TiS}}_{2}.$ We have used the full-potential linear augmented-plane-wave method as embodied in the WIEN97 code. Our calculations show that $1T\ensuremath{-}{\mathrm{TiS}}_{2}$ is semimetallic at ambient pressure in agreement with th…
N-Methylaniline-, diphenylamine-, and N-phenylnaphthylamine-blocked toluene diisocyanates (TDI) were prepared and characterized by IR, NMR spectroscopy, and nitrogen content analyses. The structure–property relationship of these adducts was established by reacting with hydroxyl-terminated polybutadiene (HTPB). The cur…
The electrical properties of surface conductive layers of the undoped diamond films via various subsequent treatments and of the as-grown N-doped diamond films have been investigated in the present study. Hall effect measurements reveal that the sheet carrier density of the surface conductive layers almost remains con…
We present an ab initio study of alkali metal adsorption on metal oxide surfaces. We have investigated the changes that occur to the structure and electronic properties of the rutile ${\mathrm{TiO}}_{2}$ (100) surface when a $\frac{1}{2}$ monolayer of potassium atoms is adsorbed. The K atoms are reduced to ${\mathrm{K…
Optical reflectivity spectra of La(1-x)Sr(x)MnO(3) (0<=x<=0.30) were measured on cleavage surfaces of single crystals. The optical conductivity $\sigma(w) of ferromagnetic-metal La(0.70)Sr(0.30)MnO(3) is characterized by a Drude-like - but not simple Drude - component with large spectral weight below 1.6 eV, which yie…
A spectroscopic study of epitaxial phosphorus-doped n-type diamond films, prepared by the chemical vapor deposition (CVD) technique, was carried out using the constant photocurrent method (CPM). Liquid nitrogen temperature CPM data show two new optically active defects in the gap of the P-doped CVD diamond film. A the…
Optical-absorption spectra of PbSe and PbS spherical quantum dots have been studied both theoretically and experimentally. Exact theoretical analysis of the energy spectra and optical transitions has been carried out in the framework of four-band $\mathbf{k}\ensuremath{\cdot}\mathbf{p}$-method with full account of the…
The influence of magnetoelastic effects on the anisotropy in NdFeB permanent magnets has been investigated. A relation between the magnetostriction coefficients and the magnetoelastic anisotropy is derived for crystals with tetragonal symmetry. Transmission electron microscopy experiments show that stress and strain a…
Polar, nonferroelectric (BaxSr2−x)TiSi2O8 glass ceramics with highly oriented crystallites were prepared by a gradient temperature heat treatment technique. The crystallization mechanism and microstructures of (BaxSr2−x)TiSi2O8 glass ceramics were investigated by means of differential thermal analysis, x-ray diffracti…
Tracer diffusion of Zr95 and Nb95 has been measured in a set of β-Zr-Nb alloys (Zr-5.5 at. % Nb, Zr-16.3 at. % Nb, and Zr-28.1 at. % Nb) in a wide temperature range from 1035 to 1871 K. All experimental concentration profiles revealed a Gaussian-like behavior over two to three decades in logarithm of concentrations. E…
Two new cardenolides, 3beta-hydroxy-5alpha-carda-14(15), 20(22)-dienolide (beta-anhydroepidigitoxigenin) (1) and 3beta-O-(D-digitalosyl)-21-hydroxy-5beta-carda-8,14,16 , 20(22)-tetraenolide (neriumogenin-A-3beta-D-digitaloside) (2), and two known compounds, proceragenin and neridienone A (3), have been isolated from t…
The low-temperature oxidation during deposition by evaporation of molybdenum thin films has been investigated. Analysis by x-ray photoelectron spectroscopy and x-ray diffraction reveals that small differences in the substrate temperature during deposition may give rise to important changes in the final composition and…
The Isothermal Transient Ionic Current (ITIC) technique was applied to β-Ta2O5 samples made by chemical vapor deposition. The mobility, conductivity, and number of protons in the material could be extracted from the measurements. Li ions were intercalated electrochemically into the β-Ta2O5 and it was found that the IT…
A series of novel poly(arylene ether ketone)s were synthesized from the reaction of hydroquinone and 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one with 4,4′-difluorobenzophenone in N-cyclohexylpyrrolidinone containing anhydrous potassium carbonate. The polymers exhibited high glass transition temperatures together with exc…