Materials Literature
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Graphite is composed of a series of stacked parallel graphene layers bonded by weak van der Waals forces. Although the weak interactions that hold the graphene sheets together allow them to slide readily over each other, the numerous weak bonds make it difficult to separate the sheets. A graphene sheet is a two-dimens…
We designed and fabricated a dielectric metamaterial consisting of one set of high permittivity resonators. We experimentally showed that this metamaterial exhibits resonant effective permittivity, issued from the second mode of Mie resonances of these resonators. Therefore, metamaterials consisting of high permittivi…
We report the effect of impurity doping at the Mn-site on magnetization and magnetic entropy change (ΔSm) in Pr0.6Ca0.4Mn0.96B0.04O3 with B cations having different electronic and spin states [B=Al3+(d0), Cr3+(d3), Fe3+(d5), Co2+(d7), Ni2+(d8), and Ru4+/5+(d4/3)]. The charge ordered antiferromagnetic insulator Pr0.6Ca…
In studies of weak magnetism in diluted magnetic semiconductor thin films, there is often a significant difficulty in subtracting the background signal arising from the substrate. In the present work, an improved magnetic correction method is proposed. For Al doped ZnO and Fe doped TiO2 films, the magnetic moment and…
A thin dielectric resonator consisting of a dielectric substrate and the thin film deposited upon it is shown to suffice for microwave characterization and dielectric parameter measurement of high-permittivity thin films without electrodes. The TE01δ resonance mode was excited and measured in thin (down to 0.1 mm) rec…
We report our recent findings from the study of the field emission, electrical transport, and their correlation of individual single CuO nanowires grown by thermal oxidation. Typical Fowler–Nordheim (FN) plot of a single CuO nanowire exhibits an upward bending behavior with increasing applied electric field: a rare ph…
The citrate reduction method of synthesis of gold nanoparticles (AuNPs) as introduced by Frens has been standardized to enable one to prepare AuNPs of desired dimension by controlling the composition of the reactants. The standardization has been made through characterization of the nanoparticles by UV-vis spectroscop…
We report the first observation of ultraviolet superfluorescence (SF) from oxygen vacancies in WO3−x nanowires at room temperature, and of picosecond-scale energy transfer between emission centers (oxygen vacancies) in a plane. A theoretical development from Dicke’s model leads to general formulation for a two-dimensi…
Bacteria regulate the frequency and timing of DNA replication initiation by controlling the activity of the replication initiator protein DnaA. SirA is a recently discovered regulator of DnaA in Bacillus subtilis whose synthesis is turned on at the start of sporulation. Here, we demonstrate that SirA contacts DnaA at…
Anionic nanoclays, so-called layered double hydroxide (LDH) nanoparticles, have been extensively applied as drug delivery systems, since they efficiently enter cells via endocytosis pathway and possess controlled release property. However, the stability of LDHs varies, depending on the type of interlayer anions, which…
A hybrid composite material, consisting of BaTiO3 and multi-walled carbon nanotubes, was synthesized by an efficient solvent-thermal route. Transmission electron microscopy images clearly indicate that the surfaces of the multi-walled carbon nanotubes were uniformly decorated by well-crystallized BaTiO3 particles, wit…
A stress-biased magnetoelectric sensor with a built-in permanent magnet has been fabricated using piezoelectric lead magnesium niobate-lead titanate single crystal and magnetostrictive Terfenol-D alloy. The resonance characteristics and magnetoelectric performance of the sensor have been evaluated under different stre…
The Stokes shift detected in PbS nanocrystals is analyzed by optical absorption (OA), photoluminescence (PL) and atomic force microscopy (AFM). The samples were synthesized by fusion method over two different glass substrates, and identical size PbS dot structures with radius 4.1 nm grown showed PL and OA peaks separa…
The stability of the remnant polarization in the ferroelectric barrier layer is a prerequisite to applications involving ferroelectric tunnel junctions (FTJs) or capacitors. One of the most important issues in the pursuit of further developments in this area is to overcome the limitations due to the critical thickness…
Abstract Dehydrocoupling reactions of amine–borane adducts catalyzed by half-sandwich carbonyl complexes are described. Secondary amine–borane adducts released H2 with catalytic action of [CpMn(CO)3] (Cp: η5-C5H5), [(η6-C6H6)Cr(CO)3], and [CpV(CO)4] under photoirradiation to produce dimeric or monomeric aminoboranes.…
Abstract Two kinds of diarylperfluorocyclopentenes having 5-phenyl-2-propyl-3-thienyl and 2-isobutyl-5-phenyl-3-thienyl group as the aryl groups were newly synthesized, and the thermal stability of their closed-ring isomers was investigated. The bulkiness of the substituent (R) at the reacting positions in photochromi…
With Fe compensation, the heavy rare earth element Gd-filled GdyFexCo4−xSb12 (x<2) skutterudites have been successfully synthesized by melting-annealing approach. Fe substitution on the Co site brings two contrary effects on Gd filling: charge compensation which enhances the filling fraction of Gd, and Lattice…
The titanium dioxide (TiO2) films prepared by sol-gel processing were used to fabricate metal-semiconductor-metal ultraviolet photodetectors. A very low dark current of 5.38 pA (current density of 3.84 nA/cm2) at 5 V bias is obtained, which is ascribed to the high effective Schottky barrier between Au and TiO2 films.…
Intracellular drug delivery of layered double hydroxide (LDH) nanocarriers have been examined in human osteosarcoma Saos-2 cell culture line by both electron and confocal microscopies. For transmission electron microsopic (TEM) study, LDHs and anticancer drug, methotrexate (MTX) loaded LDHs were synthesized and the pa…
In order to identify and compare the effects of different concentrations of coatings (Carboxy Methyl Cellulose, CaCl2, Bee wax) and packaging (polyethylene sheet), on improving the keeping quality of mangoes its storage performance was evaluated. Mangoes after harvesting were given hot water treatment at 50±2oC for th…