Materials Literature
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A new mixed-valence ferrite, YBaFe 4 O 7, has been synthesized. Its unique cubic structure, with a = 8.9595(2) Å, is closely related to that of the hexagonal “114” oxides YBaCo 4 O 7 and CaBaFe 4 O 7 . It consists of corner-sharing FeO 4 tetrahedra, forming triangular and kagome layers parallel to (111) C . In fact, t…
We present ab initio density functional studies of the stability and the formation of oxygen vacancies on three low-index surfaces of ${\text{V}}_{2}{\text{O}}_{5}$. In agreement with the experimental results on the morphology of ${\text{V}}_{2}{\text{O}}_{5}$ crystallites we find that the surface energies of the (100…
In this study, we have investigated a quasi-two-dimensional organic conductor, λ-BETS 2 FeCl 4 , that exhibits a phase transition from a paramagnetic metal to an antiferromagnetic (AF) insulator at a critical temperature ( T MI ∼8.3 K). To investigate the mechanism of a notable phase transition, we studied the thermal…
Polypropylene (PP) is one of the five kinds of universal polymers that have greatly improved our life qualities. While a pestilent limitation of PP is its flammability. Usually, halogen-containing flame retardants (FRs) are used to improve its flame retard ability. However, the halogen-containing FRs are limited more…
Abstract How do living organisms attain the complicated shapes of grown bio‐composites? This question is answered when studying the mechanics of the nacre layer in the bivalve mollusk shells. In this study, the internal strains/stresses across the shell thickness are profiled as a function of depth by strain gauge mea…
Abstract A method for incorporating barium titanate (BT) nanoparticles into polymethylmethacrylate (PMMA) is proposed to prepare composite films with a high dielectric constant and high transparency. BT particles with particle sizes of 7.8–24.0 nm and crystal sizes of 8.60–17.7 nm were synthesized with a complex alkox…
Abstract Nanocomposites were prepared with different grades of nitrile–butadiene rubber (NBR) [with nitrile (CN) contents of 26, 35, and 42%] with organoclay (OC) by a melt‐compounding process. The rubber/clay nanocomposites were examined by transmission electron microscopy (TEM) and X‐ray diffraction (XRD). An increa…
Abstract Biodegradable polyurethane (PU) elastomers with potential for biomedical and industrial applications were synthesized by the reaction of poly(ε‐caprolactone) (PCL) and isophorone diisocyanate (IPDI), extended with different mass ratio of chitosan and 1,4‐butane diol (BDO). Their chemical structures were chara…
In their effort to measure yarn hairiness at high speed, the commercially available yarn hairiness testers resort to indirect techniques. Measurement of true length of all hairs can only be done by observing the yarn under a microscope and obtaining a trace of hairs. An attempt was made in this work to automate this t…
In order to control the preparation of strontium titanate with a well‐defined Sr/Ti stoichiometry produced by the mixed oxide route, dilatometric experiments have been conducted for compositions with Sr/Ti ratios ranging from 0.996 to 1.005. A significant change in sintering behavior has been detected going from a tit…
In this study, the effects of material optimization and compounding processes on the properties of natural fiber composites were studied. The thermal stabilities of sisal fiber and jute fiber were compared by thermogravimetric analysis. The influences of fiber content, coupling agent, fiber geometry, and fiber distrib…
In order to understand the unusual magnetic phase of multiferroic hexagonal manganites, we have investigated the doping effects of hexagonal manganites ${\text{YMn}}_{0.9}{X}_{0.1}{\text{O}}_{3}$ ($X=\text{Al}$, Ru, and Zn) by using bulk measurements as well as neutron-diffraction experiments. We have also re-examined…
We describe a novel method to synthesize colloidal particles with an eccentric core−shell structure. Titania−silica core−shell particles were synthesized by silica coating of porous titania particles under Stöber (Stöber et al. J. Colloid Interface Sci. 1968, 26, 62) conditions. We can control access of silica to the…
Effects of electron–phonon interaction on the optical-phonon spectrum are studied within the lowest order perturbation in a bilayer graphene with potential difference associated with applied electric field. Due to the asymmetry of two layers, symmetric and antisymmetric modes are strongly mixed with each other and two…
N-Fluorenyl-9-methoxycarbonyl-protected amino acids are used as surfactants for carbon nanotubes and their interactions are modeled using quantum mechanical computations. These surfactants are then converted into enzymatically activated CNT surfactants that create homogeneous aqueous nanotube dispersions on-demand und…
Highly efficient green phosphors SrSi 2 O 2 N 2 : Eu 2+ , suitable for white light emitting diodes (LEDs), was synthesized by solid-state reaction and their photoluminescence properties were investigated. SrSi 2 O 2 N 2 : Eu 2+ phosphors can be effectively excited by ultraviolet (UV)–Vis light (300–460 nm) and yield g…
Abstract Nylon 11 (PA11) nanocomposites with different loadings of multi‐walled carbon nanotubes (MWNTs) were prepared by melt compounding. Scanning electron microscopy images on the fracture surfaces of the composites showed a uniform dispersion of MWNTs throughout the matrix. The presence of the MWNTs significantly…
The 3D-QSAR method comparative molecular field analysis (CoMFA) involves the estimation of atomic partial charges as part of the process of calculating molecular electrostatic fields. Using 30 data sets from the literature the effect of using different common partial charge calculation methods on the predictivity (cro…
The hybridization scheme of plasmon modes in cut-wire-based left-handed metamaterials is shown to critically depend on the coupling between paired cut wires. We show that an inverted hybridization scheme obtained with an asymmetric alignment of paired cut wires is the most appropriate to negative refraction. This is v…
The magnetoresistance (MR) behaviour and the magnetocaloric effect (MCE) of the ferromagnetic shape memory alloy of nominal composition Ni2Mn1.36Sn0.64 have been investigated. We observe giant negative MR (~ − 48% at 90 kOe) around the martensitic transition (MT) temperature. The observed MR was found to be irreversib…