Materials Literature
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In the presented work an optical levitation technique performed by means of a focused laser beam, Mie and Raman spectroscopy have been utilized for measuring hygroscopic growth curves and composition of laboratory generated single ammonium sulfate (AS) and internally mixed ammonium sulfate-glutaric acid (GA) droplets…
Simultaneous structuro-kinetic information obtained via time resolved stopped-flow/UV-Vis spectroscopy/dispersive EXAFS (EDE) experiments elucidated a two-step process for the addition of iodobenzene to [(Ph3P)2Pd(dba)].
A theoretically, predicted bandgap corresponding to the zero volume-averaged refractive index is verified experimentally by measuring the scattering parameters of a one-dimensional layered stack composed of left-handed and right-handed materials. The unique property of the zero-n gap, also denoted zero order bandgap,…
We investigated the effect of hydrogen on the tensile properties of a quench-tempered low-alloy steel, SCM435, with the tensile strength of 930 MPa used for hydrogen storage cylinders. Tensile specimens were machined from a cylinder with the inside and outside diameters of 245 and 315 mm. The specimens were immersed i…
The present study has demonstrated the influence of the fluorine/carbon (F∕C) ratio on superhydrophobicity of carbon nanofibers (CNFs) prepared by a template-assisted synthesis. An approach to coat fluorocarbon on the surface of nanofibers is introduced via a thermal chemical vapor method, using perfluorohexane as the…
A special precipitation process developed at Ovonic Battery Company has been utilized to produce spherical, high-density nickel-hydroxide powders with different chemical compositions. These powders were tested in sealed, cylindrical C-cell size nickel metal hydride batteries to study the effect of chemical composition…
We reported a type-I difference-frequency generator (DFG), based on erbium doped GaSe (Er:GaSe) crystals as a coherent infrared source tunable from 2.4 mum to 28 mum. The two mixing beams used for the DFG are a tunable near infrared output (1.1-1.8 mum) from an optical parametric amplifier (OPA) and the fundamental be…
As the -doped phosphors were synthesized by solid-state method, their characterization and luminescent properties were also investigated. The extraordinary excitation spectra showed only intense transition of ions around near-UV region, while the transition could be neglected. Under excitation, the as-obtained powders…
The reinforcing effect of chopped rice husk (CRH) into polypropylene has been studied. Composites containing different amounts of CRH with 0 to 40 parts per hundred part of polymer (php) were prepared using a co-rotating twin screw extruder and characterized by mechanical properties and also water absorption. In order…
Polymer therapeutics are being designed for lysosomotropic, endosomotropic and transcellular drug delivery. Their appropriate intracellular routing is thus crucial for successful use. For example, polymer-anticancer drug conjugates susceptible to lysosomal enzyme degradation will never deliver their drug payload unles…
A supercritical fluid method has been developed to prepare hydrothermally stable, high quality mesoporous MCM-48 materials. Pure silica MCM-48 materials were post-treated by supercritical carbon dioxide containing a small amount of aluminum tri-sec-butoxide (sc-CO2/Al). The hydrothermal stability of these treated MCM-…
Planar metamaterials with spiral elements are suggested in this paper to support multiple left-handed (LH) modes. Compared with previously proposed split-loop metamaterial, spiral arrays are found to support hybrid TE and TM LH modes. Dispersion diagrams and field distributions are carried out to demonstrate the exist…
Purpose This paper aims to provide a rapid and accurate method to predict the amount of sewing thread required to make up a garment. Design/methodology/approach Three modeling methodologies are analyzed in this paper: theoretical model, linear regression model and artificial neural network model. The predictive power…
Two new series of bent-core mesogenic dimers with structurally different types of carbosilane units show broad regions of polar smectic phases with a transition from antiferroelectric to surface-stabilized ferroelectric switching with increasing length of the spacer units. A non-classical organization of the molecules…
The crystal structure of a spin-transition compound, namely the thiosemicarbazone ferric complex Li[Fe(5BrThsa)2]·H2O, was solved from powder X-ray diffraction data at temperatures where the high-spin (373 K) and low-spin (150 K) phases prevail. The methodology is based on traditional approaches (direct methods) combi…
This paper deals with a new application of polyaniline synthesized chemically, coated on sawdust via cast method in the form of emeraldine base (EB) from formic acid as solvent, and used as an effective adsorbent for removal of mercuric ion or other heavy metals from aqueous solution. Among the different parameters in…
Broadband planar and non-planar negative refractive index (NRI) metamaterial (MTM) designs consisting of a periodically arranged split ring resonator and wire structures are developed in the terahertz (THz) frequency regime using the Finite-Difference Time-Domain (FDTD) method.The novel MTM designs generate a broad ne…
The effects of nanoroughness and chemical composition on the contact and sliding angles on hydrophobic surfaces were studied theoretically and experimentally. A theoretical model based on forces developed at the contact area between a liquid drop and hydrophobic smooth or nanoroughened surface was developed and compar…
The guided modes in a left-handed material (LHM) asymmetric slab waveguide are studied in this paper.Dispersion properties of electromagnetic guided waves are discussed by introducing three normalized parameters.The guidance conditions of guided modes in waveguide are determined by using a graphical method.Then we put…
Self-assembly of functionalized tetraarylporphyrins into 2-D and 3-D supramolecular arrays may exhibit structural isomerism when carried out in different experimental conditions. This study shows that the open 2-D hydrogen bonding quadrangular grid networks of free-base tetra(4-carboxyphenyl)porphyrin (TCPP) form an i…