Materials Literature
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The hydrothermal synthesis of barium titanate particles by reaction of titanate layered nanotubes and barium hydroxide in aqueous solution at 90, 110, and 200 °C from 1 to 24 h has been studied. Anisotropic growth of barium titanate particles was observed when the synthesis temperature was 90 °C resulting in the forma…
The role of surfactant and solvent in the size and morphology of nickel oxalate particles synthesized from reverse micelles was investigated. Nanorods of nickel oxalate with aspect ratios of 5:1 and 6:1 were formed from n -hexane and cyclohexane, respectively. Our studies show that the bulkiness of the solvent molecul…
Abstract Inorganic nano fillers have demonstrated great potential to enhance the properties of natural rubber (NR). The present article reports the successful development of a NR nanocomposite reinforced with nano silica (SiO 2 ). Its dynamic mechanical properties, thermal aging resistance, and morphology are investig…
The electronic properties of two spin-crossover compounds, namely, $\text{Fe}{(\text{phen})}_{2}{(\text{NCS})}_{2}$ and $\text{Fe}{(\text{btr})}_{2}{(\text{NCS})}_{2}{\text{H}}_{2}\text{O}$, are studied with the $\text{GGA}+\text{U}$ method taking explicitly into account the periodicity of the crystal. The magnetic st…
The effect of A‐site substitution on the piezoelectric coefficient, high‐temperature dc resistivity, and thermal depoling behavior of Aurivillius phase CaBi 2 Nb 2 O 9 ferroelectric ceramics was investigated. Ceramics with the general formula of Ca 1− x M x Bi 2 Nb 2 O 9 , where M=Na, (Na,Ce), (Na,La), and La, were pr…
The densification behavior and grain growth of single‐phase ZrB 2 ceramics by a spark plasma sintering (SPS) process were systematically investigated. The sintering was conducted at temperatures ranging from 1800° and 1950°C in vacuum under a pressure of 50 MPa. The heating rate and the soaking time varied from 50° to…
It is demonstrated that the ultimate physical limit of resolution of novel imaging devices based on arrays of metallic rods is determined by the skin depth of the metal. Our theoretical and numerical results show that wire medium lenses may provide a unique solution for subwavelength imaging at frequencies up to the t…
Measurements of microwave attenuation at room temperature and 4.2 K have been performed on some conductors commonly used in receiver input circuits. The reduction in loss on cooling is substantial, particularly for copper and plated gold, both of which showed a factor of 3 loss reduction. Copper passivated with benzot…
Blazing saddles: A supramolecular conglomerate is formed by intermolecular hydrogen bonding between two saddle-distorted ZnII–phthalocyanine complexes coordinated by 4-pyridinecarboxylate and one doubly protonated saddle-distorted porphyrin dication. The assembly undergoes photoinduced intrasupramolecular electron tra…
This work describes the synthesis of compounds [Pt(C=N)(NCMe) 2]ClO 4 (C=N = 7,8-benzoquinolinato (bzq), 2-phenylpyridinato (ppy)) and their use as precursors for the preparation of the cyanido complexes [Pt(C=N)(CN) 2] (-), which were isolated as the potassium, [K(H 2O)][Pt(C=N)(CN) 2] [C=N = bzq ( 3a), ppy ( 4a)], a…
Abstract This article concerns the utilization of maleated thermoplastic starch (MTPS) in the reactive extrusion melt‐blending with poly(butylene adipate‐ co ‐terephthalate) (PBAT) in blown film applications. First, MTPS was prepared from cornstarch with glycerol (plasticizer) and maleic anhydride (MA; esterification…
The secondary electron (SE) yield, delta, was measured from 24 different elements at low primary beam energy (250-5,000 eV). Surface contamination affects the intensity of delta but not its variation with primary electron energy. The experiments suggest that the mean free path of SEs varies across the d bands of trans…
First-principles density-functional theory has been used to investigate equilibrium geometries, total energies, and diffusion barriers for H as an interstitial impurity absorbed in $\ensuremath{\alpha}\text{-Fe}$. Internal strains/stresses upon hydrogen absorption are a crucial factor to understand preferred absorptio…
Ex-situ Powder-In-Tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H*, the upper critical field Hc2 and the critical current density Jc(H) together with the suppression of the anisotropy of all of these quantities. Jc reached 104 A/cm2 at 4.2 K and 10…
The process of nucleation of vapor bubbles from a superheated liquid and of liquid droplets from a supersaturated vapor is investigated using the Modified-Core van der Waals model Density Functional Theory (Lutsko, JCP 128, 184711 (2008)). A novel approach is developed whereby nucleation is viewed as a transition from…
We report on the observation of self-organized stripe-like structures on the as-grown surface and in the bulk of (Nd,Eu,Gd)Ba$_2$Cu$_3$O$_y$ single crystals. The periodicity of the stripes on the surface lies between 500 and 800 nm. These are possibly the growth steps of the crystal. Transmission electron microscopy i…
Abstract The possibility of using a corona treatment (electrical discharge at atmospheric pressure) for fiber surface activation, which can facilitate the loading of silver nanoparticles (NPs) from colloids onto the polyester (PES) and polyamide (PA) fabrics and thus improve their antibacterial properties, was studied…
A synthesis strategy to obtain monodisperse hexanethiolate-protected Au38 clusters based on their resistance to etching upon exposure to a hyperexcess of thiol is reported. The reduction time in the standard Brust-Schiffrin two-phase synthesis was optimized such that Au38 were the only clusters that were fully passiva…
Gold nanoparticles are very interesting because of their potential applications in microelectronics, optical devices, analytical detection schemes, and biomedicine. Though shape control has been achieved in several polar solvents, the capability to prepare organosols containing elongated gold nanoparticles has been ve…
Predicting magnetism originating from 2$p$ orbitals is a delicate problem, which depends on the subtle interplay between covalency and Hund's coupling. Calculations based on density functional theory and the local spin density approximation fail in two remarkably different ways. On the one hand the excessive delocaliz…