Materials Literature
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This paper contains an important message regarding the numerical modeling of left-handed media (LHM) using the finite-difference time-domain (FDTD) method which remains at the moment one of the main techniques used in studies of these exotic materials. It is shown that conventional implementation of the dispersive FDT…
A coaxial nanocable model consisting of conductive carbon nanotube core and boron nitride nanotube sheath is proposed by ab initio calculations. The conduction electron density is mainly concentrated on the inner carbon shell at the optimal interwall distance about 0.35nm. The conductivity of the core carbon nanotube…
Nickel-zinc ferrites (Ni0.5Zn0.5Fe2O4) with extraordinary electric and dielectric properties were prepared by self-combustion technique. The resistivity of ferrite in the ferric citrate system is on the order of 1010Ωcm, which is about four orders higher than that of ferrite in the ferric nitrate system as well as tha…
The authors report on the electronic properties of individual molecules of two Mn12 derivatives chemically grafted on the functionalized Au(111) surface studied by means of ultrahigh vacuum scanning tunneling microscopy/spectroscopy at room temperature. Reproducible current-voltage curves were obtained from both Mn12…
Nonthermal plasma (NTP) desorption is used in NOx aftertreatment systems for diesel engine exhaust gas. The authors conducted desorption experiments for both NTP and thermal desorptions under similar conditions and electric power levels. The results confirm that NO, NO2, and CO2 are desorbed by the NTP at lower gas te…
We propose a smart nanoparticle, a ``regulatron,'' that exploits a cycle of dynamic plasmonic feedback to self-regulate its temperature to a fixed range. One kind of regulatron can be conceived from $\mathrm{V}{\mathrm{O}}_{2}$ and Au; the temperature of this particle when illuminated by laser irradiation of suitable…
Magnesium oxide doped with Ni has been studied in two different forms: one in which the Ni ions are incorporated into the substitutional sites and the other in which Ni is present both in substitutional sites and in the form of metallic Ni precipitates embedded in the MgO matrix. Magnetic properties of these materials…
When Fe ions in the ferrimagnetic cubic MgFe2O4 are replaced by Jahn-Teller (JT)-active Mn ions, the structure evolves with two-step processes. For example, the quenched cubic MgMn1.5Fe0.5O4 becomes tetragonal and JT distorted with slow cooling. However, with further slow cooling, the clustering tendency of JT-distort…
Little is different: The specific surface areas of individual crystal facets on anatase nanocrystals (see picture) are estimated quantitatively by the combination of transmission electron microscope measurements with a Wulff-type construction of the three-dimensional shape. The results demonstrate that the crystal fac…
We investigate nonspecific protein adsorption processes by comparing experimentally measured adsorption kinetics of beta-lactoglobulin with mathematical models. The adsorption and desorption behavior of this protein on a hydrophilic glass surface in citrate buffer (pH 3.0), monitored for a large set of different bulk…
The objective of this work is to investigate in which circumstances the scattering of electromagnetic waves by a thin metamaterial slab can be characterized using known effective parameters of the associated unbounded periodic bulk medium. It is proved that the classical approach or classical boundary conditions may b…
Abstract The RTPP/ABS (rubber toughened polypropylene/poly (acrylonitrile‐ co ‐butadiene‐ co ‐styrene) blends, both noncompatibilized and compatibilized with polypropylene‐ g ‐polystyrene, were prepared by melt mixing in a Brabender Plasti‐Corder. As the torque ratio of RTPP and ABS was about 2, phase cocontinuity in…
Exchangeable potassium (EK)determined by NH4OAc may not be a reliable indicator of the soil potassium (K+)available to crops in soils containing micaceous minerals. Potassium quantity-intensity relationships (Q/I) can be used to predict K+ availability to plants in these soils. These relationships were used to study K…
( 1 − x ) Ba Ti O 3 − x ( Na 0.5 K 0.5 ) Nb O 3 ceramics with 0.0⩽x⩽0.08 formed a homogeneous solid solution. As (Na0.5K0.5)NbO3 (NKN) was added, the Curie temperature of the BaTiO3 (BT) ceramics decreased and specimens became a relaxor as x exceeded 0.04. The grain size of the BT ceramics decreased with increasing NK…
Photoluminescence study of ZnO∕Mg0.1Zn0.9O quantum wells with graded well width (Lw) was carried out at 4.2K. The emission evolution from quantum confinement regime to quantum-confined Stark regime was observed clearly. For large Lw, the emission splits into two peaks which are attributed to the emissions of ZnO band…
The lattice and elastic instabilities of rocksalt (RS) alkali hydrides (LiH, NaH, KH, RbH, and CsH) under pressure are extensively studied to reveal the physically driven mechanism of the phase transition from RS to CsCl structure by using the pseudopotential plane-wave method within density functional theory. A unive…
Abstract The introduction of true stress strain measurements, at constant strain rate, has promoted the development of empirical or semiempirical models for large deformations in thermoplastics. One such theory, which proposes that the post yield deformation process can be represented by equations derived from the the…
Abstract The effect of different organoclays and mixing methods on the cure kinetics and properties of epoxy nanocomposites based on Epon828 and Epicure3046 was studied. The two kinds of organoclay used in this study, both based on natural montmorillonite but differing in intercalant chemistry, were I.30E (Nanomer I.3…
Abstract Polyamide 6 (PA6)/HDPE/organo‐bentonite (Oclay) and PA6/HDPE‐ grafted ‐acrylic acid (PEAA)/Oclay nanocomposites were prepared via melt compounding. The influence of Oclay on the morphology of composites was investigated. Scanning electron microscopy results revealed the size of the dispersed HDPE, and PEAA ph…
ZnSe and ZnSe∕ZnS core/shell quantum dots (QDs) of two different sizes (4.5 and 3.5nm) have been synthesized. The nonlinear absorption is measured at 1064nm using a 35ps laser with an open aperture Z-scan setup. Three-photon absorption (3PA) has been observed in ZnSe and ZnSe∕ZnS QDs. 3PA cross section is found to be…