Materials Literature
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Bis(iminophosphoranyl)methanide ({CH(PPh 2 NR)} −, R = i Pr or Ph) neodymium(III) complexes were prepared from NdI 3 (THF) 3.5 . The steric bulk of the ligand controlled the stoichiometry of the resulting complexes. Thus, three new complexes, bearing one or two ancillary ligands, were prepared and characterized using…
Ageneral methodology towards stable high-performance photocontrollable organic thin-film transistors (OTFTs) by using photochromic spiropyrans (SP) combined with polymethyl methacrylate (PMMA) as a photoactive gate dielectric is reported. Capacitance and mobility transitions are demonstrated theoretically and experime…
Hot electronic dynamics in lead sulfide nanocrystals is interrogated by degenerate pump-probe spectroscopy with 20-25 fs pulses over a broad frequency range around three times the nanocrystal band gap. For each nanocrystal diameter, an initial reduction in absorption is seen only at the peak of the quantum confined E1…
We combined the Maxwell-Garnett effective medium theory with the Kramers-Kr\"onig relations to obtain the complex dielectric function $ϵ$ of colloidal PbS, PbSe, and PbTe quantum dots (Qdots). The method allows extracting both real $({ϵ}_{R})$ and imaginary $({ϵ}_{I})$ parts of the dielectric function from the experim…
In the present communication a study on the preparation and characterizations of Pine Needles (PN) reinforced polymers using Phenol-Formaldehyde (PF) as a novel polymer matrix has been reported. Pine Needles (PN) of different dimensions were used to prepare biocomposites. The influence of different fiber dimension on…
A novel fluorescent nanoparticle was prepared via a simple self-assembly technique based on water-soluble conjugated polymers (CPs) and Ag@SiO(2) core-shell nanoparticles. Core-shell nanoparticles with silver NPs core show a unique property referred to as metal-enhanced fluorescence (MEF). In the present work, the cat…
Bi 1 − x La x Fe 1 − y Co y O 3 (x=0, 0.1; y=0, 0.05, 0.1) polycrystalline thin films were fabricated on Pt/Ti/SiO2/Si(111) substrates via chemical solution deposition method. X-ray diffraction analysis revealed a phase transition in La–Co codoped BiFeO3 (BFO) thin films. Saturated ferroelectric hysteresis characteris…
Direct measurements of the diffusion length of excitons in air-suspended single-walled carbon nanotubes are reported. Photoluminescence microscopy is used to identify individual nanotubes and to determine their lengths and chiral indices. Exciton diffusion length is obtained by comparing the dependence of photolumines…
New experimental results show that either gain or loss of close packing can be observed as a discrete step in protein folding or unfolding reactions. This finding poses a significant challenge to the conventional two-state model of protein folding. Results of interest involve dry molten globule (DMG) intermediates, an…
The tunnel photocurrent between a gold surface and a free-standing semiconducting thin film excited from the rear by above bandgap light has been measured as a function of applied bias, tunnel distance and excitation light power. The results are compared with the predictions of a model which includes the bias dependen…
We have used an electro-optic technique to measure the position-dependent infrared absorption of holes injected into a thin crystal of the organic semiconductor, 6,13-bis(triisopropylsilylethynyl)-pentacene incorporated in a field-effect transistor. By applying square-wave voltages of variable frequency to the gate or…
A mixture of bi(acetylacetonato) zinc(II)hydrate and tri(dimethylglyoximato)gadolinium(III) complexes was used to synthesize Gd-doped ZnO powder. The synthesis was a result of the complexes’ thermal codecomposition. Magnetic characterizations have shown that the sample with the atomic ratio 3.5% Gd exhibited a clear f…
Transparent conducting polycrystalline Ga-doped ZnO (GZO) films with different thicknesses were deposited on glass substrates at a substrate temperature of 200 °C by ion-plating deposition with direct current arc-discharge. The dependences of crystal structure, electrical, and optical properties of the GZO films on th…
The layered ternary $sp$ conductor NaAlSi, possessing the iron-pnictide ``111'' crystal structure, superconducts at 7 K. Using density-functional methods, we show that this compound is an intrinsic (self-doped) low-carrier-density semimetal with a number of unusual features. Covalent Al-Si valence bands provide the ho…
BACKGROUND: The rapid growth of the nanotechnology industry and the wide application of various nanomaterials have raised concerns over their impact on the environment and human health. Yet little is known about the mechanism of cellular uptake and cytotoxicity of nanoparticles. An array of nanomaterials has recently…
Abstract To produce an epoxy resin with high intrinsic self‐healing efficiency, furfurylglycidyl ether (FGE) was synthesized following a two‐step route. It carried one furan and one epoxide on each of its molecules. Having been cured using N , N ′‐(4,4′‐diphenylmethane)bismaleimide and methylhexahydrophthalic anhydrid…
Polycrystalline samples of ${\text{Sr}}_{2}{\text{Mn}}_{2}{\text{CuAs}}_{2}{\text{O}}_{2}$, ${\text{Sr}}_{2}{\text{Mn}}_{3}{\text{As}}_{2}{\text{O}}_{2}$, and ${\text{Sr}}_{2}{\text{Zn}}_{2}{\text{MnAs}}_{2}{\text{O}}_{2}$ were synthesized. Their temperature- and applied magnetic field-dependent structural, transport,…
Cake filtration is a widely used solid-liquid separation process. However, the high flow resistance of the nanoporous filter cake lowers the efficiency of the process significantly. The structure and thus the permeability of the filter cakes depend on the compressive load acting on the particles, the particles size, a…
We report magnetoresistance measurements over an extensive temperature range (0.1 K $\leq T \leq$ 100 K) in a disordered ferromagnetic semiconductor (\gma). The study focuses on a series of metallic \gma~ epilayers that lie in the vicinity of the metal-insulator transition ($k_F l_e\sim 1$). At low temperatures ($T <…
Tailoring the phase stability and magnetic structure by combining the antiferromagnetic MnNiGe martensite with ferromagnetic MnFeGe austenite, a magnetic-field-induced martensitic transformation has been achieved in MnNi1-xFexGe system. The doped Fe enables the isolated structural and magnetic transitions of MnNiGe to…