Materials Literature
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A high fidelity interferometric transducer is designed based on platinum-coated nanoporous alumina films. The ultrathin metal coating significantly improves fidelity of the interferometric fringe patterns in aqueous solution and increases the signal-to-noise ratio. The performance of this transducer is tested with res…
Calcium carbonate (vaterite) nanoparticles of 20-60 nm size were obtained without stabilizing tensides by heating a dispersion of calcium bicarbonate (CaHCO(3)) in ethylene glycol for 30 minutes at 40 to 100 °C.
The phase behavior of rod-coil diblock copolymers is investigated in a two-dimensional positional space by using self-consistent field theory (SCFT) based on wormlike chain model. The segment orientation is defined on a unit spherical surface in three-dimensional space with an icosahedron triangular mesh and a finite…
We investigate the self-assembly (crystallisation) of particles with hard cores and isotropic, square-well interactions, using a Monte Carlo scheme to simulate overdamped Langevin dynamics. We measure correlation and response functions during the early stages of assembly, and we analyse the results using fluctuation-d…
We report a novel thin film polarizer fabricated from a photocurable lyotropic chromonic liquid crystal (LCLC) solution. An organic-based photocurable solution having a lyotropic liquid crystalline phase was prepared by dissolving 25–35 wt% of basic chromonic dye in an acidic monomer (acrylic acid) solution. The shear…
The influence of the pyramidal heteroanion, TeO(3)(2-) in the self-assembly of mixed metal (Mo/V) systems, is demonstrated by the isolation of three novel mixed-metal, mixed-valence architectures, {Mo(12)V(12)Te(3)} (1), {Mo(12)V(12)Te(2)} (2) and {Mo(17)V(8)Te} (3) with the tellurium centres exhibiting the novel μ(8)…
An attempt has been made to synthesize sulfur free Eu3+-activated M1−xMoO4:Eux3+ (M = Zn, Mg, Ca, Ni and Co; x = 0.2) phosphors by an oxalate sol–gel process. The process involves gel formation from solutions of metal nitrates in ethanol, ammonium heptamolybdate tetrahydrate in de-ionized water and oxalic acid in etha…
Here we report an example of a mixed thiol monolayer on the surface of Ag nanoparticles which promotes adsorption and quantitative SERS detection of 3,4-methylenedioxymethamphetamine (MDMA, "Ecstasy"); the thiols in the mixed monolayers act synergistically since MDMA does not adsorb onto colloids modified with either…
We have investigated the synthesis conditions and the magnetic properties of X-type hexagonal ferrites. It is found that Ba2Cu2Fe28O46 (Cu2X), Ba2Co2Fe28O46 (Co2X), and Ba2Ni2Fe28O46 (Ni2X) ferrites can be synthesized at a sintering temperature of 1250 °C. The x-ray diffraction patterns for Cu2X, Co2X, and Ni2X sample…
We report a large decrease in tetragonal to cubic phase transformation temperature when grain size of bulk CuFe2O4 is reduced by mechanical ball milling. The change in phase transformation temperature was inferred from in situ high temperature conductivity and x-ray diffraction measurements. The decrease in conductivi…
Nanoparticle antioxidants constitute a new wave of antioxidant therapies for disease prevention and treatment in the field of oxidative stress. These ‘artificial’ antioxidants have demonstrated free radical scavenging activity, reducing the concentration of reactive oxygen and nitrogen species, thus acting as antioxid…
Single-pot biosynthesis of silver and gold quasi-spherical nanoparticles (SNPs and GNPs) in the size range of 10-30 nm was attempted using Chenopodium album (an obnoxious weed). This method is rapid, facile, convenient and environmentally safe. Average crystal size was approximately 12 nm and 10 nm for silver and gold…
Reliable and eco-friendly process for synthesis of metallic nanoparticles is an important step in the field of the nanotechnology. One of the options to achieve this objective is to use biological systems. Here we report the ethanolic extract of B. monniera to produce silver nanoparticles by reduction of AgNO3. It was…
Carbon steel corrosion rates were measured in carbonated solution mixtures of monoethanolamine (MEA) and 1-Butyl-3-methylimidazolium dicyandiamide ([bmim] [DCA]) and MEA without [bmim] [DCA], using polarization curve and electrochemical impedance spectroscopy (EIS). Corrosion tests were carried out for 4.0 M carbonate…
In this study, polyacrylonitrile (PAN)/lignin nanofiber mats were fabricated from PAN and lignin using an electrospinning method. The nanofiber mats were irradiated with an electron beam to induce structural crosslinking. Subsequently, the crosslinked PAN/lignin nanofiber mats were carbonized to produce the carbon nan…
The magnetic properties of the metamaterial composed of both periodic and aperiodic closed rings are studied.Experimental results validate that metamaterials with 0 < µ < 1 can be nondispersive in a wide frequency range.The magnetic properties are insensitive to disorders of the closed rings, e.g., the position disord…
The effect of extract of Musa paradisiaca on corrosion inhibition of mild steel in aqueous 0.5 M sulphuric acid was investigated by weight loss method, potentiodynamics polarisation technique and electrochemical impedance spectroscopy (EIS). The inhibition efficiency is found to increase with increase in concentration…
Using results from the dielectric theory of polar solids and liquids, we calculate the mesoscopic, spatially-varying dielectric constant at points in and around a protein by combining a generalization Kirkwood-Fröhlich theory along with short all-atom molecular dynamics simulations of equilibrium protein fluctuations.…
Bench-top X-ray tomography has been successfully applied to determine the detailed internal structure of wet and dry aqueous foams. We find extensive fcc crystallisation at surfaces and random (Bernal) packing in the interior of large samples.
Abstract—In this work, a millimeter wave microstrip frequency-mixer design based on graphene is presented. The desired frequency mixing behavior is obtained using a nonlinear component consisting in a microstrip line gap covered by a graphene layer. The circuit includes microstrip filters that have been designed to ob…