Materials Literature
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Abstract Crystal growth experiments were carried out by the Travelling Heater Method using tapered growth ampoules with and without the application of a rotating magnetic field. The objective was to enhance its commercial potential by reducing the size of required seed crystals and increasing the growth rate. To this…
A concave diffraction grating with a tunable radius of curvature R is fabricated by embedding a nitinol wire within an elastomeric grating replica. Curvature of the grating is controlled via the shape memory effect, where strain in the wire is recovered due to martensite-austenite phase transformations induced by resi…
The kinetics of isothermal adsorption of nicotine from an aqueous solution onto hydrophobic zeolite type USY was investigated. The adsorption isotherms of nicotine on zeolite type USY were measured in the temperature range from 298 to 322 K. Specific shape parameters of the adsorption degree curves were determined. Th…
Abstract Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (R p ) of the graphite‐filled e…
We study the mitigation of Si nanocrystal (Si-nc) free carrier absorption (FCA) loss at telecom wavelengths in a concentric microdisk design. The concentric microdisk design relies on using the Si-nc emission as an optical pump for the surrounding Er-based lasing media without subjecting the lasing mode to the FCA los…
The electronic structures of a series of high-spin Ni(II)-thiolate complexes of the form [PhTt(tBu)]Ni(SR) (R = CPh(3), 2; C(6)F(5), 3; C(6)H(5), 4; PhTt(tBu) = phenyltris((tert-butylthio)methyl)borate) have been characterized using a combined spectroscopic and computational approach. Resonance Raman (rR) spectroscopi…
Abstract The effects of stress and temperature on the nonlinear creep behavior of linear low‐density polyethylene (LLDPE) nanocomposites reinforced with montmorillonite‐layered silicate (MLS) nanoclay and compatibilized with an amorphous maleated ethylene copolymer (amEP) is investigated. To study the effect of stress…
Silver-tetracyanoquinodimethane(Ag-TCNQ) nanostructured arrays with different morphologies were grown by an organic vapor-transport reaction under different conditions. The field emission properties of nanostructured arrays were studied systematically. Their morphology and crystal structure were characterized by SEM a…
Systems with aligned anisotropic interactions between particles exhibit numerous phase transitions. A remarkable example of the fluid phase transition occurring in such systems is the formation of particle strings--the so-called "string" or "chain" fluids. We employ an approach based on the Ornstein-Zernike (OZ) equat…
A high-quality as-grown PbSe film with a record low threading dislocation density of 9×105 cm−2 on patterned Si(111) substrate has been obtained using molecular beam epitaxy. The mechanisms leading to the remarkable reduction in threading dislocation density are analyzed. Based on the analysis, further reduction in di…
A quantitative assessment of fluorescence signal generation and persistence in blood cells, measured at multiple points over a time course, is presented. Quantum dots (QDs) are inorganic fluorophores that are photostable and nonmetabolized and so can provide quantitative measures of cell biology over multiple cell gen…
Edible films based on wheat gluten, gelatin and brea gum were prepared with incorporation of ca. 500 UA cm−2 of enterocin with anti-Listeria monocytogenes action, synthesised by Enterococcus faecium CRL1385. The analyses of the different edible films revealed that they did not show any significant changes in their fun…
Vertically aligned multiwalled carbon nanotubes (CNTs) were grown on a tungsten (W) tip by thermal chemical vapour deposition, applying a negative biasing voltage to the W tip in a pin–plate electrode configuration. The CNT electrodes, due to their nano-sized tip radii, create very high electric fields, and reduce the…
Effects of chemical treatment on the potential for recycling of bagasse pulp were evaluated. The pulps were recycled three times with water (without treatment), sodium hydroxide, and ethylamine separately. Changes in crystalline structure of the pulp during recycling were investigated by x-ray diffractometry. Water re…
The characterization of the organization of matter at different length scales is one of the main features in the field of mesostructured materials. Here, SAXS, solid-state multinuclear ( 29 Si, 1 H) MAS NMR spectra and one-dimensional 1 H spin diffusion MAS NMR experiments have been used to characterize the structure…
Both FePt/PbZr0.4Ti0.6O3(PZT)/Pt and Pt/PZT/Pt ferroelectric capacitors have been fabricated on Si substrates. It is found that up to 109 switching cycles, the FePt/PZT/Pt capacitor, measured at 50 kHz, with polarization decreased by 57%, is superior to the Pt/PZT/Pt capacitor by 82%, indicating that an intermetallic…
Poly(amidoamine) dendrimers were synthesized on cross-linked aminomethyl polystyrene. Palladium complexes of supported dendrimers prepared by ligand exchange method were reduced to dendrimer-nanoparticle conjugates supported on polystyrene resin. The supported nanoparticles were used as heterogeneous catalysts for the…
Resolution of mandelic acid (MA), a racemic compound, is presented in this article using direct crystallization from enantiomeric enriched water solutions. Final crystals with enantiomeric excess ( ee ) of ( R )-MA higher than 96.4% were obtained. Because of the presence of the opposite enantiomer (( S )-MA), it was r…
400-nm-thick Ba0.3Sr0.7TiO3 thin films are deposited on high resistivity silicon by in situ radio frequency magnetron sputtering. Coplanar waveguides with 1 μm slot width are designed, with accurate knowledge frequency losses behavior, to determine ferroelectric thin-films properties up to 60 GHz. Permittivity, loss t…
Using the lattice model for strained nanoscale ferroelectric films and quantum tunneling theory, we present a theoretical investigation of tunneling electroresistance (TER) in the ferroelectric tunnel junction (FTJ) with a SrTiO3/BaTiO3 composite barrier. The exact profile of local polarizations within the composite b…