Materials Literature
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We report the magnetic and transport properties of Ga1-xMnxP synthesized via ion implantation followed by pulsed laser melting over a range of x, namely 0.018 to 0.042. Like Ga1-xMnxAs, Ga1-xMnxP displays a monotonic increase of the ferromagnetic Curie temperature with x associated with the hole-mediated ferromagnetic…
First-principles density-functional calculations have been performed for zinc monochalcogenides with zinc-blende- and wurtzite-type structures. It is shown that the local-density approximation underestimates the band gap, misplaces the energy levels of the Zn-3d states, and overestimates the crystal-field splitting en…
In this paper different deterministic and statistical models, based on new quantized theories proposed by the author, are presented to estimate the strength of a real, thus defective, space elevator cable. The cable, of ~100 megameters in length, is composed by carbon nanotubes, ~100 nanometers long: thus, its design…
Cationic poly-L-lysine 3H-dendrimers with either 16 or 32 surface amine groups (BHALys [Lys]4 [3H-Lys]8 [NH2]16 and BHALys [Lys]8 [3H-Lys]16 [NH2]32, generation 3 and 4, respectively) have been synthesized and their pharmacokinetics and biodistribution investigated after intravenous administration to rats. The species…
Magnesium nano/mesostructures with spherical, platelike, rodlike, and sea-urchin-like shapes are prepared by a simple and efficient vapor-transport method. They exhibit excellent electrochemical properties in Mg/air batteries. The figure shows discharge curves of the Mg/air batteries made from two samples, at a consta…
We study the breakdown of the Stokes-Einstein (SE) and Debye-Stokes-Einstein (DSE) relations for translational and rotational motion in a prototypical model of a network-forming liquid, the ST2 model of water. We find that the emergence of fractional SE and DSE relations at low temperature is ubiquitous in this system…
It is well known that a state of pure shear has distinct sets of basis vectors or coordinate systems: the principal axes, in which the stress is diagonal, and pure shear bases, in which diag(stress)=0. The latter is commonly taken as the definition of pure shear, although a state of pure shear is more generally define…
In response to an external, microwave-frequency magnetic field, a paramagnetic medium will absorb energy from the field that drives the magnetization dynamics. Here we describe a new process by which an external spin injection source, when combined with the microwave field spin-pumping, can drive the paramagnetic medi…
The sulfur based Cr-spinels RCr2S4 with R = Cd and Hg exhibit the coexistence of ferromagnetic and ferroelectric properties together with a pronounced magnetocapacitive coupling. While in CdCr2S4 purely ferromagnetic order is established, in HgCr2S4 a bond-frustrated magnetic ground state is realized, which, however,…
We study the phase diagram and the commensurate-incommensurate transitions in a phase field model of a two-dimensional crystal lattice in the presence of an external pinning potential. The model allows for both elastic and plastic deformations and provides a continuum description of lattice systems, such as for adsorb…
We perform an extensive combinatorial search for optimal nanostructured hydrogen-storage materials among various metal-decorated polymers using first-principles density-functional calculations. We take into account the zero-point vibration as well as the pressure- and temperature-dependent adsorption-desorption probab…
Six kinds of water-soluble chitosan were prepared by grafting aminofunctionality onto chitosan at the C-6 position, and their antimicrobial activities were investigated against three Gram-negative and three Gram-positive bacteria. Among the derivatives, dimethylaminoethyl-chitosan (DMAEC) has the highest potential to…
Amide proton transfer (APT) imaging is a technique in which the nuclear magnetization of water-exchangeable amide protons of endogenous mobile proteins and peptides in tissue is saturated, resulting in a signal intensity decrease of the free water. In this work, the first human APT data were acquired from 10 patients…
Magnetite particles with an average size of 39 nm and good monodispersity have been synthesized by coprecipitation at 70 °C from ferrous Fe 2+ and ferric Fe 3+ ions by a (N(CH 3 ) 4 OH) solution, followed by hydrothermal treatment at 250 °C. The magnetite nanoparticles before the hydrothermal step display an average s…
The ability of different correlation functions to shed some light onto the conformational dynamics of an amorphous polymer has been analyzed. The study has been performed on a polyethylene model polymer, which has been simulated at decreasing temperatures towards its glass transition, via the molecular dynamics techni…
The Jet Propulsion Laboratory (JPL), Pratt & Whitney Rocketdyne, and Teledyne Energy Systems, Inc., have teamed together under JPL leadership to develop the next generation of advanced thermoelectric space reactor power conversion systems. The program goals are to develop the technologies needed to achieve a space nuc…
Efficient resonant electron transfer from the surface bonding structure to the conduction band of quantum confined Si nanocrystals is observed by Si nanocrystals in a toluene suspension. Based on the electron transfer mechanism, the enhancement of photoluminescence originates from the band-to-band recombination in the…
Bioassay guided fractionation of the dichloromethane extract of the underground parts of Gethyllis ciliaris, using a cyclooxygenase-1 enzyme assay, has resulted in the isolation of the dihydroxydimethylbenzopyran-4-one isoeugenitol 1 (IC50 = 262 μM). The 90% methanolic extract yielded 9Z-octadec-9-enamide 3 and the no…
Novel aquocyanophthalocyaninatocobalt(III) (Phthalcon 11) nanocrystals were used as intrinsically conducting fillers in cross-linked epoxy composites. The prepared conductive composites had a percolation threshold φ c between 0.9 and 9 vol %. The φ c appeared to be strongly dependent on layer thickness. Modeling showe…
In situ reflection electron energy loss spectroscopy (REELS) and reflection high energy electron diffraction employing a 20keV electron beam at a 2° grazing angle were used to characterize the surface properties of molecular beam epitaxy (MBE) grown Al, Ga, and In metals on silicon and sapphire substrates. In our stud…