Materials Literature
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Ni3C nanoparticles of about 40 nm have been studied experimentally to exhibit weak ferromagnetic (FM), spin-glass (SG) and paramagnetic (PM) properties. The freezing temperature of the SG phase at zero applied field is determined as, TF0 ~ 11.0 K. At T > TF0, a very weak ferromagnetism has been observed over a PM back…
In this note, we show that the latest spin grating measurement of spin helix by Koralek {\em et al.} [Nature {\bf 458}, 610 (2009)] provides strong evidence of the infinite spin diffusion length of any spin polarization along the direction perpendicular to the effective magnetic field from the Dresselhaus and Rashba s…
Vertically aligned nematic (VAN) liquid crystals (LC) are interesting for many photonics applications. The performance of VAN cells depends on different factors; the boundary interactions between the LC monolayer and the alignment layer surface are the most important ones. These interactions are determined by anchorin…
Powder compaction and sintering characteristics of the PMN-PT powder prepared by the partial oxalate route have been studied. The PMN-PT powder achieved 60% of theoretical density during compaction by pressing at 100 MPa. The powder compacts were sintered to > 99% TD at 1270°C for 2 hours. Microstructure of the sinter…
Ni49Mn38Sn13 nanocrystals exhibit a sharp transition from a paramagnetic martensite MP to a strongly ferromagnetic austenite phase AF, with a well-defined peak of magnetotherm at 288.1 K (∼15 K peak-width) upon heating in a low magnetic field (a few tens of mT). The Curie point of the austenite phase, = 305 K lies wel…
We examine the differences in electro-optical behavior of weakly polymer stabilized cholesteric liquid crystals (PSCLC) when formed using either a flood lit UV lamp, a flood lit UV laser, or a holographically patterned UV laser. Both samples formed with the UV laser exhibit symmetry in their dynamic electro-optical pr…
Abstract To prepare the polystyrene (PS)‐clay nanocomposites via an in situ emulsion polymerization, a clay predispersion method, i.e. dispersing the organic clay in the emulsifier solution by the assistance of ultrasonic, was proposed in this study. The conventional method, predispersing the organic clay into the mon…
In this study, the authors propose a new bacteria detection method using a carbon nanotube (CNT) gas sensor and a microheater, which were coupled into a Bio-MEMS (microelectromechanical systems)-type device. Bacteria were heated by the microheater in air so that ammonia (NH(3)) gas can be generated by the oxidation re…
We study the dispersion relations of plasmonic bands that arise from the coupling of electric-quadrupole resonances in three-dimensional plasmonic lattices consisting of metallic nanospheres. Through analytical derivation, we show that two branches of quadrupole bands in simple-cubic lattices with a small lattice cons…
Nanometer metal oxides were highly desirable to increase the burning rate of composite solid propellant because of their high catalytic activities. However, poor dispersibility limits their wide applications. In this work, the dispersibility of CuO was enhanced significantly by attachment to the mesoporous silica SBA-…
Autologous vascular tissues with a small diameter, "biotubes," were developed in vivo using a novel concept in regenerative medicine, "in-body tissue architecture technology." The effect of pulsatile flow in vitro was investigated on the structural and functional properties of the biotubes. Silicone rods (diameter, 3.…
Nanocrystalline α-Al 2 O 3 powder with average crystallite sizes of 34−68 nm have been synthesized by three different methods, namely, solvothermal, sol−gel, and precipitation. Although the smallest crystallite size of α-Al 2 O 3 was obtained via the sol−gel synthesis, the α-Al 2 O 3 sol−gel possessed the least amount…
Laterally substituted by fluorine atoms 4-cyanophenyl 4-(4-pentylbenzoyloxy)-benzoates have been prepared and their phase transition temperatures, enthalpies and dielectric properties upon frequency were evaluated. The novel compounds exhibit a broad range of nematic mesophase, large positive dielectric anisotropy cha…
This work presents the measurement of the dielectric anisotropy of selected nematic liquid crystals in the 0.01–6 GHz range, and comparison of the measurements with the birefringence values at optical frequencies. The effect of alignment on the reproducibility of dielectric measurements was also measured. It was found…
In this study, we report on the frequency dependence of dielectric and conductivity properties of a Ba6 - 3xLa8 + 2xTi18O54 compound with x = 0.6 in a temperature range of 283–523 K. X-Ray diffraction confirmed the formation of single-phase compound in the orthorhombic system. Dielectric constant was observed to be de…
Using density functional theory, we study H 2 dissociation on Ti/Al(100) alloy surfaces, modeled by different Ti coverages varying from 1/4 to 1 monolayer. The minimum barrier height for H 2 dissociation depends on the specific Ti coverage on the Al surface. In view of experimental information on Ti in hydrogenated an…
The adhesion of human leukocytes to nanostructured surfaces with different chemical properties and the effect of protein adsorption were investigated. Self-assembled monolayers (SAMs) prepared with mixtures of methyl- and hydroxyl-terminated alkanethiols in different percentages on gold were used. The surfaces were pr…
Equal channel angular extrusion (ECAE) is a relatively novel forming process to modify microstructure via severe plastic deformation without modification of the sample cross section. In this study, an optimized design of die geometry is presented, which improves homogeneity of the plastic deformation and decreases the…
Abstract Raman spectroscopy has been used to study the rare‐earth mineral churchite‐(Y) of formula (Y,REE)(PO 4 ) ·2H 2 O, where rare‐earth element (REE) is a rare‐earth element. The mineral contains yttrium and, depending on the locality, a range of rare‐earth metals. The Raman spectra of two churchite‐(Y) mineral sa…
Zeolite A and MCM-41 have extensive applications in basic science, petrochemical science, energy conservation/storage, medicine, chemical sensor, air purification, environmentally benign composite structure and waste remediation. However, the use of zeolite A and MCM-41 in these areas, especially environmental remedia…