Materials Literature
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We present the selected results of theoretical and experimental investigations of high-performance ultra-thin metamaterial-inspired absorbers designed for narrow-band operation at subterahertz frequencies and intended for integration with spectrally-selective bolometric devices. The attainability of values up to 182 f…
Abstract In this work, agave fibers were blended with polystyrene to produce foamed and unfoamed composites. The effect of fiber size and density reduction on the morphological, thermal, mechanical, and rheological properties, as well as crystallinity and water absorption kinetics of the composites was assessed. The r…
The genus Mycobacterium comprises major human pathogens such as the causative agent of tuberculosis, Mycobacterium tuberculosis (Mtb), and many environmental species. Tuberculosis claims ~1.5 million lives every year, and drug resistant strains of Mtb are rapidly emerging. To aid the development of new tuberculosis dr…
O₂ adsorption is a key process for further understanding the mechanism of selective CO oxidation (SCO) on gold catalysts. Rate constants related to the elementary steps of O₂ adsorption, desorption and surface bonding, as well as the respective activation energies, over a nanosized Au/γ-Al₂O₃ catalyst, were determined…
Aluminum coatings are widely used as oxygen and water barrier layers on food packaging materials to protect the product from contamination and to extend its shelf life. Thin layers of aluminum, of the order of a few tens of nanometers, are thermally evaporated onto polymeric web in high speed roll-to-roll vacuum metal…
Abstract The main objective of this investigation was to study and compare the thermal rigidity, thermal stability, and processability of poly(vinyl chloride) (PVC) composites filled with single fillers of talc and uncoated ground CaCO 3 (SM 90) or a hybrid filler consisting of talc/SM 90. To produce the composites, t…
Abstract The main objective of the present work was the study of the effect of organoclay on planar shrinkage anisotropy of polymeric injection‐molded products by means of a rheological technique, in conjunction with birefringence measurements, performed on polycarbonate/organoclay samples. Polarized optical microscop…
A series of vanadium substituted potassium hexagonal tungsten bronzes KxVyW1-yO3 (K-HTB) were prepared by conventional solid state method at 800 °C with compositions of x = 0.30 and 0.00 ? y ? 0.15. A mixture of K-HTB and non bronze phases with y ? 0.20 was observed. The proportion of this non bronze phase increases w…
We investigate the energy levels and optical properties of a circular graphene quantum dot in the presence of an external magnetic field perpendicular to the dot. Based on the Dirac–Weyl equation and assuming zero outward current at the edge of the dot we present the results for two different types of boundary conditi…
Biogenic polyamines are essential for cell growth and differentiation, while polyamine analogues exert antitumor activity in multiple experimental model systems, including breast and lung cancer. Dendrimers are widely used for drug delivery in vitro and in vivo. We report the bindings of biogenic polyamines, spermine…
The structure of Eu${}^{2+}$ monomer centers in CsBr single crystals is investigated using electron paramagnetic resonance (EPR) spectroscopy. These centers are produced by heating the melt-grown crystals above 600 K in vacuum followed by a rapid quench to room temperature (RT) or 77 K. The angular dependence of their…
A unique approach was used to synthesize nanographene directly on insulating substrates with precise positioning control. The process is comprised of two steps: (i) deposition of carbon using focused ion beam induced deposition and (ii) annealing in vacuum at mid-high temperatures using metal foil as the catalyst mate…
Abstract Natural fibers are widely used as reinforcement in composites. Pine needles are one of the major biowaste generated by Pinus roxburgii plant. This species is found abundantly in the forests of Himachal Pradesh. In this work, composites of urea–resorcinol–formaldehyde resin‐reinforced with Pine needles fibers…
Ein sphärischer Pd12L24-Komplex dient als Templat bei der Synthese von hohlen Siliciumdioxidnanopartikeln, die Metallcluster mit definierter Atomzahl n in ihrem Inneren enthalten. Der eingeschlossene Pd12L24-Komplex wird in der schützenden Siliciumdioxidhülle zunächst in einen (PdO)n-Oxidcluster umgewandelt und anschl…
A relatively thin structural film with low strain gradient is developed for micro-relay technology. Relays fabricated using this film as the structural material operate with relatively low pull-in voltage and hysteresis, which is desirable for achieving low-power and high-endurance relay integrated circuits. With the…
Abstract The blends of polystyrene (PS) and styrene‐butadiene rubber (SBR) are melt‐blended at different ratios to form physical thermoplastic elastomers. This polymeric blend is expected to behave more or less similar to chemically synthesized block copolymers such as styrene‐butadiene block copolymers (SBS). In this…
The potential solid oxide fuel cell cathode material Bi1-xSrxFeO3-δ exhibits low electrical conductivities (1-12 S cm-1 at 750°C) and is therefore especially susceptible for significant sheet resistance effects when investigated in thin film form. Impedance spectra of circular thin film microelectrodes of Bi1-xSrxFeO3…
Optical properties of IR-emitting centres in Pb-doped silica fibres, Zlenko, Alexander S, Firstov, Sergei V, Ryumkin, K E, Khopin, V F, Iskhakova, L D, Semenov, S L, Bufetov, Igor' A, Dianov, Evgenii M
Nb-doped SrTiO3 anodes, infiltrated with CGO/Ni, were investigated by electrochemical impedance spectroscopy (EIS) and high resolution microscopy techniques, upon varying production and testing parameters. The electrochemical analysis involved a combination of distribution of relaxation times (DRT) and complex non-lin…
We report on the preparation and characterization of high surface area, supported nanoporous tungsten oxide films prepared under different conditions on polished polycrystalline Ta and Pt(111) substrates via direct sublimation of monodispersed gas phase clusters of cyclic (WO 3 ) 3 . Scanning electron microscopy and t…