Materials Literature
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The magnetic field dependence of the dielectric permittivity of Terfenol-D/PbZrxTi1-xO3 magnetoelectric composites in the temperature range from 200 K to 340 K was investigated systematically. It was found that there is a large magnetodielectric effect up to 15% around the electromechanical resonance frequency in a ma…
We report the development of new nanophosphor structures based on the Mn-doped ZnSeS material system to enhance the color properties, luminosity and efficiency of white LEDs. These structures have been demonstrated for phosphor-based white LED applications utilizing both blue and UV LED systems. Bandgap tuning for nea…
An investigation of the magnetocaloric effect for Ni-Mn-Ga films with a composition chosen to yield the highly advantageous magnetostructural phase transition between the paramagnetic austenitic and the ferromagnetic martensitic phases is presented. The observed effect is particularly strong at low magnetic fields, yi…
Contact line dynamics on rough or chemically heterogeneous surfaces has been a subject of great interest. Most previous work focused on the issue of contact angle hysteresis in the static limit. This paper is devoted to the study of contact line dynamics on a chemically patterned surface over a wide range of contact l…
The thermotropic and optical characterisations of a novel polymer dispersed liquid crystal (PDLC) system based on polysulfone UDEL P-1700 as polymer matrix and a low molecular weight liquid crystal compound containing a mesogenic azomethine core and a cyano-substituent were investigated. The PDLC samples were prepared…
Hybrid structures of colloidal quantum dots (QDs) with Ru-dyes have been studied as candidates for panchromatic sensitizers for TiO2-based solar cells. Steady-state and time resolved photoluminescence spectroscopy and photocurrent measurements have been employed to identify the prevailing transfer mechanisms for photo…
Since ceramics in the PbZrO 3 – PbTiO 3 binary system display excellent piezoelectric properties and those in BiFeO 3 – PbTiO 3 exhibit high Curie temperatures, morphotropic phase boundary ( MPB ) compositions in the BiFeO 3 – PbZrO 3 – PbTiO 3 ternary solid solution system are investigated for the development of piez…
2.7 μm emission properties and energy transfer mechanism of Nd3+/Er3+ co-doped sodium tellurite glasses are investigated in present paper. Absorption and emission spectra were tested to characterize the 2.7 μm emission properties of Nd3+/Er3+ co-doped sodium tellurite glasses and a reasonable energy transfer mechanism…
The simple synthesis of one-dimensional (1D) semiconducting nanostructures with high charge-carrier transport is an important aim for the fabrication of organic electronic devices. Here, we report an initiator-assisted chemical processing technique that creates 1D nanocomposites consisting of a nanofibrillar polyanili…
Abstract Conducting polymers (CPs) provide a class of processible, film forming semiconductors and metals. Electrical and optical properties of CPs, similar to those of metals and semiconductors, and the attractive properties associated with conventional polymers such as ease of synthesis and processing, has given the…
Hydrogenated diamondlike carbon (H-DLC) coatings provide excellent wear resistance and low friction for bearing applications. However, the use of such coatings with aqueous lubricants could pose some difficulties due to the hydrophobic nature of the surface. A thrust bearing tribometer was used to compare performance…
Electrical detection of specific proteins was demonstrated using aptamer-modified graphene field-effect transistors (G-FETs). Immunoglobulin E (IgE) aptamers were immobilized onto the graphene surface with 1-pyrenebutanoic acid succinimidyl ester as a linker. From an atomic-force microscopy image, the height of the gr…
The synthesis and properties of Mg((x))Zn((1 - x))Fe(2)O(4) spinel ferrites as a low-toxicity alternative to the technologically significant Ni((x))Zn((1 - x))Fe(2)O(4) ferrites are reported. Ferrite nanoparticles have been formed through both the polyol and aqueous co-precipitation methods that can be readily adapted…
In the hope of developing metal nanoparticles that are expected to possess simultaneously higher surface-enhanced Raman scattering (SERS) activity and also catalytic activity, we have prepared Ag/Pd alloy nanoparticles by coreduction of Ag and Pd ions using citrate and then examined their characteristics in terms of t…
Standard approximations to the density functional theory exchange-correlation functional have been extraordinary successful, but calculating formation enthalpies of reactions involving compounds with both localized and delocalized electronic states remains challenging. In this work we examine the shortcomings of the g…
A key consideration for all radioactive waste vitrification technologies is the physical and chemical integrity of the melting vessel. Most melting vessels require refractory liners that can safely withstand the high-temperature, highly corrosive environment, contain molten waste mixtures during melting and provide ro…
Linear free energy relationships (LFER) combined with molecular dynamics (MD) simulations were used to investigate the sorptive characteristics of organic compounds (OCs) on cetyltrimethylammonium (CTMA) intercalated montmorillonite (CTMA-Mont). The LFER for OCs sorption on CTMA-Mont, log K(oc) = (1.45 ± 0.20)E - (0.3…
In recent years, the electrospinning system has been attracting great attention due to various potential applications in many areas of science and technology as a cost-effective and highly versatile technique used to produce continuous nanofibers. However, solution electrospinning of polyolefins, including polyethylen…
Many entities currently use permeability specifications in portland cement concrete (PCC) pavements and structures. This project investigated the use of a surface resistivity device as an indication of concrete’s ability to resist chloride ion penetration for use in quality assurance (QA) and acceptance of concrete. A…
The characteristics of the excitonic absorption and emission around the fundamental bandgap of wurtzite MgxZn1−xO grown on c-plane sapphire substrates by plasma assisted molecular beam epitaxy with Mg contents between x = 0 and x = 0.23 are studied using spectroscopic ellipsometry and photoluminescence (PL) measuremen…