Materials Literature
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We have studied a quinary Fe-based superconductor ${\text{Sr}}_{2}{\text{VFeAsO}}_{3}$ by the measurements of x-ray diffraction, x-ray absorption, M\"ossbauer spectrum, resistivity, magnetization, and specific heat. This apparently undoped oxyarsenide is shown to be self-doped via electron transfer from the ${\text{V}…
SrWO 4: x %Eu 3+,Na + ( x = 0, 0.05, 0.5, and 5) have been prepared by the solid-state reaction method. Low temperature, high resolution emission and absorption spectroscopies have been employed to probe the local site symmetry of Eu 3+ ions occupied the Sr 2+ site in SrWO 4 with a doping concentration up to 5% using…
A series of inorganic–organic complexes based on polymolybdate anions and copper–organic subunits, [Cu(H2O)(bim)2]{[Cu(Hbim)2][P2Mo5O23]}·2H2O (1), [Cu(Hbim)2]{[Cu(bim)(H2O)2]2[Cu(bim)2]2[(P2Mo5O23)2]}·20H2O (2), [Cu(phen)(H2O)][Cu(bim)2]2[P2Mo5O23]·H2O (3) and Mg[Cu(bim)(H2O)]2[P2Mo5O23]·4H2O (4) (bim = 2,2′-biimidaz…
Silica gel is a mesoporous, granular material with a high specific surface area that is widely used as a support for heterogeneous catalysts. This study explores the atomic layer deposition (ALD) of aluminum oxide (Al 2 O 3 ) in silica gel. The coated materials were analyzed using weight-gain measurements, nitrogen ad…
Single crystals of amylose V 2-propanol, i.e., amylose cocrystallized with water and 2-propanol, were prepared from synthetic linear amylose. When observed under frozen hydrated conditions, these crystals yielded base-plane electron diffraction diagrams containing more than 100 independent diffraction spots, whose int…
Abstract Poly (lactic acid) (PLA), a biodegradable aliphatic semicrystalline polyester was filled with 40 wt% spruce wood flour (WF), to produce composite materials. Hydrothermal treatment, as well as maleic anhydride, vinyltrimethoxysilane, and stearic acid surface treatments were applied. The influence of surface mo…
The use of in situ approaches to study mechanisms of experimentally demanding and complex reactions under conditions of practical relevance opens doorways to discover new or improved heterogeneous catalysts. A representative example within this category of reactions is the gas-phase oxidation of HCl to Cl 2 (Deacon pr…
Crystal structures of the heterometallic compounds CrCrFe(dpa)(4)Cl(2) (1), CrCrMn(dpa)(4)Cl(2) (2), and MoMoMn(dpa)(4)Cl(2) (3) (dpa = 2,2'-dipyridylamide) show disorder in the metal atom positions such that the linear M(A)[quadruple bond]M(A)···M(B) array for a given molecule in the crystal is oriented in one of two…
Donuts anyone? Molecules based on a meta-linked aromatic segment self-assemble into hexameric macrocycles that, in turn, stack on top of each other to from elongated tubular helical suprastructures. The formed tubules dissociate into discrete stacks of toroids in response to the addition of silver salt (see picture).
Date Palm Fiber (DPF) is one of the most available natural fibers in the Middle East, especially in Iran and the Persian Gulf region. This research provides a new insight into DPF, with consideration of morphological, chemical characteristics, and bulk density, as well as morphological and mechanical properties of DPF…
Complexes of sodium poly(4-styrenesulfonate) (NaPSS) and poly(diallyldimethylammonium chloride) (PDADMAC) were formed on mixing equimolar solutions in high salt concentration. Under ultracentrifugal fields, the complex precipitates were transformed into compact polyelectrolyte complexes (CoPECs), which showed extensiv…
Acoustic emission monitoring is often used in the diagnosis of electrical and mechanical incipient faults in high-voltage apparatus. Partial discharges are a source of failure in power transformers, and the differentiation from other sources of acoustic emissions is of the utmost importance. This paper reports the dev…
Abstract Peapodlike Ni/Ni 3 S 2 chains of about 30 nm in outer diameter, with Ni cores of 10–15 nm, can be synthesized by a sacrificial template route. The Ni 3 S 2 shell exhibits paramagnetic properties with a mass susceptibility of χ ≈ 5 × 10 −5 emu (gOe) −1 , while the ferromagnetic Ni cores show a superparamagneti…
Abstract A new technology based on the liquid support system is introduced for fabricating continuous twisted nanofibrous yarn. In this novel technique, the electrospun yarn was collected from the top of the water vortex such that it can be twisted simultaneously during yarn production. Our study demonstrated the feas…
Abstract PVA nanofibers have been successfully prepared via an electrospinning process by optimizing the electrospinning operational parameters including applied voltage, polymer concentration, feed rate, and working distance. Inexpensive NaCl and Fe(NO 3 ) 3 are found to reduce the fiber size drastically (minimum of…
We have shown theoretically that efficient multiple-exciton generation (MEG) by a single photon can be observed in small nanocrystals. Our quantum simulations that include hundreds of thousands of exciton and multiexciton states demonstrate that the complex time-dependent dynamics of these states in a closed electroni…
This paper reports a mechanically flexible, transparent thin film transistor that uses graphene as a conducting electrode and single-walled carbon nanotubes (SWNTs) as a semiconducting channel. These SWNTs and graphene films were printed on flexible plastic substrates using a printing method. The resulting devices exh…
The modeling of inrush currents that occur upon energization of a transformer is a challenge for Electromagnetic Transients Programs due to limitations in available transformer models and the ability to determine and specify initial flux. The estimation of transformer model parameters is also an issue. This paper pres…
Recent reports question the validity of pulsed fs-laser experiments for measuring the photon-to-exciton quantum yields (QYs) that result from multiple exciton generation (MEG). The repetitive nature of these experiments opens up an alternative relaxation pathway that may produce artificially high results. We present t…
Density functional theory (DFT) modeling of the physisorption of four different types of molecules (toluene, bromine dimmer, water and nitrogen dioxide) over and above graphene ripples has been performed. For all types of molecules changes of charge transfer and binding energies in respect to flat graphene is found. T…