Materials Literature
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Abstract Store it up: The ammoniate, Li(NH3)BH4, has been prepared and fully characterized by Raman and NMR spectroscopy and X‐ray powder diffraction. The potential for its use as an ammonia store and a comparison to other ammonia storage materials is discussed. magnified image Lithium borohydride absorbs anhydrous am…
Deep-red emissive polymeric BODIPY dyes (polymers A and B ), poly(2,6-BODIPY-ethynylene)s, were prepared by palladium-catalyzed Sonogashira polymerization of 2,6-diiodo-functionalized BODIPY monomers with 2,6-diethynyl-functionalized BODIPY monomers. Poly(2,6-BODIPY-ethynylene)s emit in the deep-red region with emissi…
Biodegradable polymer and nanorod (<1% by volume) composites are formulated that heat when exposed to infrared light and undergo shape transitions (see image). The heating is repeatable and tunable based on nanorod concentration and light intensity.
A general technique is presented for the generation of transparent oleic acid-coated nanoparticle (NP)/polymer composite materials via in situ polymerization in the presence of a poly(ethylene glycol)−monooleate ligand. Using this technique several transparent upconverting NaYF4 NP/PMMA bulk polymer composites with va…
Please release me: The heat generated when metal nanoparticles absorb light results in a significant increase in the temperature of the environment around the particles and is used to selectively break bonds within a molecular system anchored to the nanoparticle surface (see picture). This process represents an advant…
A state-of-the-art review is presented of research into the strength, the ductility, the superplasticity, and other mechanical properties of metal, alloy, intermetallic, semiconductor, and high-melting-point compound-based nanomaterials. Various theoretical approaches are described. Size effects, interfaces, and other…
We consider a one-dimensional lattice of Ising-type variables where the ferromagnetic exchange interaction J between neighboring sites is frustrated by a long-ranged anti-ferromagnetic interaction of strength g between the sites i and j, decaying as |i-j|^-alpha, with alpha>1. For alpha smaller than a certain threshol…
The ideal intrinsic barriers to domain switching in $c$-phase ${\text{PbTiO}}_{3}$ (PTO), ${\text{PbZrO}}_{3}$ (PZO), and ${\text{PbZr}}_{1\ensuremath{-}x}{\text{Ti}}_{x}{\text{O}}_{3}$ (PZT) are investigated via first-principles computational methods. The effects of epitaxial strain on the atomic structure, ferroelec…
We investigate the effects of Rashba spin-orbit (RSO) interactions on the electronic band structure and corresponding wave functions of graphene. By exactly solving a tight-binding model Hamiltonian we obtain the expected splitting of the bands---due to the SU(2) spin symmetry breaking---that is accompanied by the app…
We demonstrate that nanosize diamond particles in a stable solid phase can act as nuclei for carbon nanotube (CNT) growth by chemical vapor deposition. This growth process is explained by a new growth mechanism, where the surface diffusion of carbon adatoms on the solid surface of nanoparticles plays an important role…
LaCu3Fe4O12 undergoes a phase transition at 393 K involving the spin order (SO) of the Fe sites and the charge order (CO) resulting in Cu-Fe intersite charge transfer. On the basis of density functional calculations, we show that this simultaneous CO/SO phenomenon is a consequence of two electronic effects, namely, th…
We report on the experimental results of interlayer magnetoresistance in the multilayer massless Dirac fermion system $\ensuremath{\alpha}\mathrm{\text{\ensuremath{-}}}(\mathrm{BEDT}\mathrm{\text{\ensuremath{-}}}\mathrm{TTF}{)}_{2}{\mathrm{I}}_{3}$ under hydrostatic pressure and its interpretation. We succeeded in det…
A non-destructive technique for obtaining voltage contrast information with photoelectron emission microscopy (PEEM) is described. Samples consisting of electrically isolated metal lines were used to quantify voltage contrast in PEEM. The voltage contrast behavior is characterized by comparing measured voltage contras…
Despite a considerable effort aiming at elucidating the nature of ferromagnetism in ZnO-based magnetic semiconductor, its origin still remains debatable. Although the observation of above room temperature ferromagnetism has been reported frequently in the literature by magnetometry measurement, so far there has been n…
The Tc map in parameter space of electron-phonon interaction $λ$ and phonon frequency $Ω$ is used to classify already known superconductors. The Tc map is partitioned into six regions based on superconductors parameters $λ$ and $Ω$, We briefly discuss the properites of superconductors in evey regionm The Tc map can be…
This article reports a novel method to significantly enhance the conductivity of conducting poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films through a treatment with aqueous solutions of various salts, such as copper(II) chloride. Conductivity enhancement by a factor of about 700 was observed.…
Electron paramagnetic resonance (EPR) spectroscopy and spin trapping were used to explore the mechanism of alcohol oxidation over gold catalysts. Reaction of secondary alcohols with supported and unsupported gold catalysts (e.g., Au/CeO(2), polymer-incarcerated Au nanoparticles, PPh(3)-protected Au nanoparticles) in t…
The conducting interface of LaAlO3/SrTiO3 heterostructures has been studied by hard x-ray photoelectron spectroscopy. From the Ti 2p signal and its angle dependence we derive that the thickness of the electron gas is much smaller than the probing depth of 4 nm and that the carrier densities vary with increasing number…
A critical aspect in the development of biomaterials is the optimization of their surface properties to achieve an adequate cell response. In the present work, electrospun polycaprolactone nanofiber meshes (NFMs) are treated by radio-frequency (RF) plasma using different gases (Ar or O(2)), power (20 or 30 W), and exp…
In this work we study (i) the formation and stabilization of silver nanoparticles in a bioactive chitosan-derived polysaccharide solution, (ii) the antimicrobial properties, either in solution or in 3D hydrogel structures, obtained by mixtures with the polysaccharide alginate, and (iii) the cytotoxicity of the latter…