Materials Literature
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We present theoretical studies for the third-order elastic constants $C_{ijk}$ in zinc-blende nitrides AlN, GaN, and InN. Our predictions for these compounds are based on detailed ab initio calculations of strain-energy and strain-stress relations in the framework of the density functional theory. To judge the computa…
We obtain analytic formulas for the frequency-dependent spin-Hall conductivity of a two-dimensional electron gas (2DEG) in the presence of impurities, linear spin-orbit Rashba interaction, and external magnetic field perpendicular to the 2DEG. We show how different mechanisms (skew-scattering, side-jump, and spin prec…
Using the spectroscopies based on x-ray absorption, we have studied the structural and magnetic properties of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{O}$ films ($x=0.1$ and 0.25) produced by reactive magnetron sputtering. These films show ferromagnetism with a Curie temperature ${T}_{C}$ above room t…
The size distribution and magnetic properties of ultra-small gadolinium oxide crystals (US-Gd 2 O 3 ) were studied, and the impact of polyethylene glycol capping on the relaxivity constants ( r 1 , r 2 ) and signal intensity with this contrast agent was investigated. Size distribution and magnetic properties of US-Gd…
We present an atomistic model of a single nanoparticle with core/shell structure that takes into account its lattice strucutre and spherical geometry, and in which the values of microscopic parameters such as anisotropy and exchange constants can be tuned in the core, shell and interfacial regions. By means of Monte C…
Stimuli responsive magnetic emulsions are produced by using “smart” microgels as stabilizers. The oil droplets in the emulsions are magnetic, can be separated with a static magnetic field and are destabilized by an ac magnetic field. This allows for a remote control on separation and stability of the emulsion.
Abstract Composites based on high density polyethylene (HDPE), pine flour, and organic clay were made by melt compounding and then injection molding. The influence of clay on crystallization behavior, mechanical properties, water absorption, and thermal stability of HDPE/pine composites was investigated. The HDPE/pine…
NRC publication: Yes
Electrical and electrochemical processes in a bioactive soda-lime phosphosilicate glasses and in a bioabsorbable soda-lime phosphate glass during thermal poling were studied by means of thermally stimulated depolarization current measurements, ac impedance spectroscopy, and SEM/EDX analyses. The thermal poling was don…
Fluids in which the interparticle potential has a hard core, is attractive at moderate separations, and repulsive at large separations are known to exhibit unusual phase behavior, including stable inhomogeneous phases. Here we report a joint simulation and theoretical study of such a fluid, focusing on the relationshi…
In the last few years, genome‐based studies in diatoms have received a major boost following the genome sequencing of the centric species Thalassiosira pseudonana Hasle et Heimdal and the pleiomorphic raphid pennate diatom Phaeodactylum tricornutum Bohlin. In addition, molecular tools, such as genetic transformation,…
In the present work, current model equations from an analytical model for carbon nanotube field effect transistors are utilized to calculate the transfer characteristics of different logic gates such as inverters, NAND gates, and NOR gates. A small signal model has been implemented and the necessary parameters have be…
Abstract Vulcanized blends from soy meal and natural rubber were successfully processed through semi‐pilot scale extrusion, roll milling and compression‐molding. Blends containing about 50 wt.‐% of soy meal are elastic and water resistant, compared with the brittle and hydrophilic soy meal. The natural rubber componen…
Highly dispersible TiO2 nanocrystals (approximately 6 nm) were prepared by an alcohothermal method. A strong and stable photoluminescence emission with a maximum at 450 nm was observed in the original TiO2 nanocrystals colloid. Compared with the emission from quinine sulphate in 0.05 mol/L sulphuric acid, the emission…
The validity of the electron effective attenuation length database developed by National Institute of Standards and Technology (NIST) is examined for x-ray photoelectron spectroscopy (XPS) measurement of HfO2 (2.7nm)∕SiON (0.8nm)∕Si. The angular dependences of photoelectron yields are calculated using the NIST databas…
Dispersion relations of Lamb waves and shear horizontal (SH) waves propagating in the [100] and [110] directions of 0.67Pb(Mg1∕3Nb2∕3)O3–0.33PbTiO3 piezoelectric single crystal plate poled along [001]c were calculated. Multiple crossings between symmetric and antisymmetric modes appear due to the moderate anisotropy o…
Structural transformation of the Ge2Sb2Te5 was investigated by a high resolution transmission electron microscopy (HRTEM). It was found that Ge atoms undergo umbrella-flip motion from a tetrahedral site into an octahedral site in transforming from the amorphous to the metastable phase of Ge2Sb2Te5. The presence of a t…
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) is usually used to facilitate hole injection in polymer light emitting diodes. The authors used ultraviolet photoelectron spectroscopy to investigate ionization potential (IP) changes of PEDOT:PSS spin coated on indium tin oxide (ITO), and found t…
Bi Fe O 3 (BFO) thin films produced with varied film thicknesses ranging from 100to230nm were fabricated on BaPbO3(BPO)∕Pt∕Ti∕SiOx∕Si substrates by rf-magnetron sputtering. Saturated polarization–electrical field hysteresis loops, polarization response by pulse measurement, and retention properties were obtained for B…
The authors report transport measurements on naturally formed carbon nanotube T junctions with a semiconducting bar and a metallic stem. The T junctions provide a unique structure that allows them to compare the quasi-zero-dimensional (Q0D) contact formed at the junction node with the quasi-one-dimensional (Q1D) conta…