Materials Literature
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Multiphase borosilicate glass‐ceramics represent one candidate to contain radioactive nuclear waste separated from used nuclear fuel. In this work, the thermophysical properties from room temperature to 1273 K were investigated for four different borosilicate glass‐ceramic compositions containing waste loadings from 4…
En este trabajo reportamos la sintesis, la caracterizacion estructural, el comportamiento ferroelectrico y las propiedades electronicas de la perovskita compleja Ba2ZrTiO6. Las muestras fueron sintetizadas mediante el metodo estandar de reaccion de estado solido. La estructura cristalina se estudio a traves de experim…
We present here an x-ray absorption study of the $R$Fe${}_{2}$O${}_{4}$ series (LuFe${}_{2}$O${}_{4}$, YFe${}_{2}$O${}_{4}$, YbFe${}_{2}$O${}_{4}$, and LuCoFeO${}_{4}$) at the Fe $K$-edge. Extended x-ray absorption fine structure (EXAFS) and x-ray absorption near-edge structure (XANES) spectra were measured at tempera…
The influence of ammonia on the optical absorption of polyaniline films obtained by the electrochemical method is studied. In the presence of ammonia, the optical spectra of a polymer are found to change due to the appearance of a new absorption band with a maximum at 2.07 eV and a simultaneous decrease in the intensi…
The melting of fluorographene is very unusual and depends strongly on the degree of fluorination. For temperatures below 1000 K, fully fluorinated graphene (FFG) is thermomechanically more stable than graphene but at T m ≈ 2800 K FFG transits to random coils which is almost 2 times lower than the melting temperature o…
Elastin-like polypeptides (ELPs) are large, nonpolar polypeptides under investigation as components of a novel drug delivery system. ELPs are soluble at low temperatures, but they desolvate and aggregate above a transition temperature (TT). This aggregation is being utilized for targeting systemically delivered ELP-dr…
Stratified optical filters with distinct spectral features and layered surface chemistry were prepared on silicon substrates with stepwise anodic porosification and thermal carbonization. The use of differing parameters for successive carbonization treatments enabled the production of hydrolytically stable porous sili…
The role of a thin layer of conductive poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate (PEDOT : PSS), inserted between the gate dielectric and the active layer in poly(3-hexylthiophene)-based transistors was investigated. The devices were fabricated in the bottom-gate top-contact geometry by using cr…
We have investigated the electromechanical response of potassium sodium niobate ( K 0.5 Na 0.5 NbO 3 or KNN ) thick films. The high‐field strain hysteresis loops and weak‐field converse piezoelectric d 33 coefficient of the films were measured and compared with those of KNN bulk ceramics under the same electric field…
GeSi nanostructured films were obtained by cosputtering from two Ge and Si targets and subsequent annealing in furnace in N2 for 5 h at 700, 800 and 900 °C, with the aim to show the correlation between electrical properties and crystalline structure of the films. The as-deposited films are amorphous, have a Ge:Si comp…
Mg‐Al‐Fe ternary layered double hydroxides (LDH) were synthesized based on red mud (RM) by calcination‐rehydration method, and characterized using X‐ray diffraction (XRD). And, the LDH coated with ZnSn(OH) 6 (ZHS) was studied by XRD, scanning electron microscopy (SEM), transmission electron microscopy, and energy disp…
Herein we report the preparation and characterization of dendronized supramolecular polymers composed of a carboxy-terminated azodendron, dAZO, and two different vinylpyridine-containing polymers: poly(4-vinylpyridine) (P4VP) and polystyrene - b - poly(4-vinylpyridine) (PS - b - P4VP) block copolymer. P4VP can selecti…
Fischer–Tropsch (F–T) synthesis has attracted much research attention nowadays because of the severe oil crisis and the tight fuel specifications [ 1 , 2 ]. One of the goals of modern F–T synthesis research is to design a catalyst capable of highest selectivity to the desired product without sacrificing activity and l…
Head-to-tail regioregular poly(4-alkylthiazoles) ( C 9 -pTz, C 13 -pTz, alkyl = n -C 9 H 19, n -C 13 H 27 ) have been synthesized and spectroscopically and electrochemically characterized. The PTz s were obtained by transmetalation of 2-chloro-5-bromo-4-alkylthiazoles with i PrMgCl, followed by Kumada-coupling polycon…
O tracer experiments. The investigations were performed on the same thin film samples and at the same temperature (400 °C) in order to get complementary information by the two methods. Electrochemical impedance spectroscopy can reveal resistive and capacitive contributions of such systems, but an exact interpretation…
We report on the design, characteristics, and measurements of a terahertz (THz) metamaterial absorber (MA) based on fractal Sierpinski curves. By applying the fractal structure as the top resonators array, a more compact unit cell with a size reduction of 42% and dual-frequency operation has been achieved as an advant…
We show how all-angle negative refraction can occur in a uniaxial antiferromagnet close to the magnon resonance frequency. This behavior is based on the fact that, in such cases, the antiferromagnet acts as an indefinite permeability medium, i.e., not all its permeability tensor components are of the same sign. If an…
We develop the many-pole dielectric theory of UV plasmon interactions and electron energy losses, and couple our advances with recent developments of Kohn-Sham density functional theory to address observed discrepancies between high-precision measurements and tabulated data for electron inelastic mean free paths (IMFP…
Ag/PMMA nanocomposites were successfully synthesized by in-situ technique. Transmission electron microscopy (TEM) images show that the particles are spherical in shape and their sizes are dependent on temperature. The smallest particle achieved high stability as indicated from Zeta sizer analysis. The red shift of sur…
Stimuli-responsive photonic gels are made from the lamellar block copolymer (BCP) poly(styrene- b -2-vinylpyridine) (PS–P2VP), where the photonic responses are triggered by swelling/deswelling of the P2VP block with a selective solvent. When compared to isotropic swelling in chemically cross-linked homopolymer gels, t…