Materials Literature
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We have developed a novel thermal conductivity measurement technique that is applicable to micro- and nanoscale structures. The methodology integrates a device consisting of two identical microheaters with thin-filmed platinum heating elements and integrated resistance temperature devices (RTDs) on trenched, thermally…
This article presents the research results concerning the possibilities of natural zeolite-ferrierite application for the reduction of nitrogen oxide. H-FER forms were modified by Cu +2 , Co +2 , Mn +2 , Ni +2 using an ion exchange procedure. The effect of metal contents was shown for the ferrierite matrices and relat…
Herz aus Gold (oder Silber): Der verzerrt-kubische MPd14-Kern von [(μ14-M)Pd22(CO)20(PEt3)8]+ [M=Au (1), Ag (2)] enthält ein verkapseltes M-Atom (siehe Bild; gelb), das durch acht Pd-Atome (schwarz) koordiniert ist, die die Ecken des Kubus bilden, sowie durch sechs (grau), die die Flächen überdachen. 1 und 2 wurden du…
This study concentrates on the potential application of conjugated polyelectrolytes (CPEs) to cell imaging and DNA delivery. Four different types of polyfluorene copolymers, namely, PAHFP-Br, PAEFP-Br, PAHFbT-Br, and PSBFP-Na, which have the same π-conjugated backbone but different side chains, were synthesized. For c…
We report the results of a high-resolution powder neutron-diffraction study of multiferroic BiFe${}_{0.7}$Mn${}_{0.3}$O${}_{3}$. We have confirmed the previous assignment of the $\ensuremath{\alpha}$ phase and $\ensuremath{\beta}$ phase as having $R3c$ and $Pbnm$ symmetry, respectively. The $\ensuremath{\gamma}$ phase…
Excitons of tetrapod-shaped nanocrystals made of CdTe, CdS, CdSe, ZnTe, and ZnSe were investigated systematically by numerical diagonalization of configuration interaction Hamiltonian based on single-particle states obtained by finite-element method. Both one-particle and exciton wave functions have high spatial symme…
Pyroelectric response mechanism of Ba0.70Sr0.30TiO3 ceramics under dielectric bolometer (DB) mode was investigated by dielectric and pyroelectric properties measurement. The variations of total, intrinsic, and induced pyroelectric coefficients (ptot, pint, pind) with temperatures and bias fields were analyzed. pint pl…
Previously electric-field-induced transitions from helical to planar structures in bulk liquid crystals were considered to take place with unwinding of helix. We show that the transition to the planar structure in polar smectic with frustrating interlayer interaction can occur without unwinding but through the formati…
During the past two years, we have underlined the great potential of p-type oxychalcogenides, with parent compound BiCuSeO , for thermoelectric applications in the medium temperature range (400–650°C). These materials, which do not contain lead and are less expensive than Te containing materials, exhibit large thermoe…
We propose optical imaging technique that relies on diffractive rather than refractive elements. Our approach takes advantage of metagratings, structures with engineered diffraction properties, and natural materials with sufficiently high refractive indices to achieve significant reduction in pixel size. In contrast t…
Abstract We have studied the effect of silicon nanocrystals (SiNCs) as a third component on performance of organic bulk heterojunction solar cells composed of poly[2‐methoxy,5‐(2′‐ethylhexyloxy)‐1,4‐phenylene vinylene] (MEH‐PPV):[6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) blend film. By adding suitable amounts o…
Heart of gold (or silver): The pseudo-D2d distorted MPd14 cubic kernel of [(μ14-M)Pd22(CO)20(PEt3)8](+) cations, with M = Au (1), Ag (2), has an encapsulated M atom (see picture; yellow) coordinated to eight cubic corner (black) and six face-capping Pd atoms (gray). Compounds 1 and 2 were obtained (28-60 % yields) fro…
(NH4)3PMo12O40 and (NH4) x X y PMo12O40 mixed salts (X: Sn, Sb and Bi) were prepared at pH 4 and characterised by IR, Raman and UV–Vis spectroscopies, 31P NMR, XRD, BET and thermal analysis (TG and DTA). The different salts were tested in propan-2-ol decomposition at 100 °C, after pretreatment in situ under nitrogen s…
The time continuity, spatial continuity, and segregation are investigated in the directional solidified columnar dendrite with pulling velocity 40 μm/s and quenching solidified columnar dendrite of 20SiMn and 20SiMnMo steel. The results show that the growth of columnar dendrite is a dynamic discrete process with inter…
This paper investigate the performance of lightweight oil palm shells (OPS) concrete with varied bamboo reinforcement content for the concrete slab of 300mm x 300mm size reinforced with different thickness subjected to low impact projectile test. A self-fabricated drop-weight impact test rig with a steel ball weight o…
This work focuses on the combination of the complementary physical properties of multiwalled carbon nanotubes (MWCNTs) and poly(3-octylthiophene) (P3OT)/polystyrene (PS) polymer blend. The characterization of MWCNTs/P3OT/PS hybrid system performed by Fourier transform infrared spectroscopy, ultraviolet (UV)–visible ab…
ABSTRACT A novel, efficient, and easily synthesizable catalyst, an emeraldine form of polyaniline (PANI)−1‐hydroxyethane 1,1‐diphosphonic acid salt (HEDP), was successfully synthesized and demonstrated as a reusable polymer‐based solid acid catalyst in the synthesis of N ‐benzylidine‐2‐phenyl imidazo[1,2‐a]pyridines w…
We propose a specific procedure to compute the inductance of a toroidal ferrite core as a function of the excitation current. The study includes the linear, intermediate and saturation regions. The procedure combines the use of Finite Element Analysis in 2D and experimental measurements. Through the two dimensional (2…
This article summarizes the recent advancements made in the area of materials and components for low temperature solid oxide fuel cells (LT-SOFCs). LT-SOFC is a new trend in SOFC technology since high temperature SOFC puts very high demands on the materials and too expensive to match marketability. The current status…
Although it is widely recognized that doping sensitizers in the shell can improve significantly the luminescence of lanthanides doped nanocrystals, lack of an unambiguous picture of relevant luminescence enhancement mechanism seriously hinders the optimization of this approach. In this work, the complete processes of…