Materials Literature
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The atomic and electronic structures of a graphene layer on top of the $(2\ifmmode\times\else\texttimes\fi{}2)$ reconstruction of the SiC $(000\overline{1})$ surface are studied from ab initio calculations. At variance with the (0001) face, no C buffer layer is found here. Si adatoms passivate the substrate surface so…
We present evidence for spin-polarized charge carriers in ${\text{In}}_{2}{\text{O}}_{3}$ films. Both ${\text{In}}_{2}{\text{O}}_{3}$ and Cr doped ${\text{In}}_{2}{\text{O}}_{3}$ films exhibit room-temperature ferromagnetism after vacuum annealing, with a saturation moment reaching approximately $0.5\text{ }\text{emu}…
The forces between charged macromolecules, usually given in terms of osmotic pressure, are highly affected by the intervening ionic solution. While in most theoretical studies the solution is treated as a homogeneous structureless dielectric medium, recent experimental studies concluded that, for a bathing solution co…
The mechanism of spin-pumping, described by Tserkovnyak et al., is formally analyzed in the general case of a magnetic multilayer consisting of two or more metallic ferromagnetic (FM) films separated by normal metal (NM) layers. It is shown that the spin-pumping-induced dynamic coupling between FM layers modifies the…
We study the electronic structure of the junctions between a single graphene layer and carbon nanotubes, using a tight-binding model and the continuum theory based on Dirac fermion fields. The latter provides a unified description of different lattice structures with curvature, which is always localized at six heptago…
We compare, through first-principles pseudopotential calculations, the structural, electronic, and optical properties of different size silicon nanoclusters embedded in a ${\text{SiO}}_{2}$ crystalline or amorphous matrix with that of freestanding, hydrogenated, and hydroxided silicon nanoclusters of corresponding siz…
The problem of Dirac fermions in graphite subject to a perpendicular magnetic field is studied. We show analytically that the weak inter-layer interaction between the graphene sheets leads to anomalies in the Shubnikov-de Haas and de Haas-van Alphen magneto-oscillations governed by the orbits around extremal cross-sec…
Compared to single-walled carbon nanotubes (SWNTs) and more defective multiwalled carbon nanotubes (MWNTs), the thin few-walled carbon nanotubes (FWNTs) are believed to have extraordinary mechanical properties. However, the enhancement of mechanical properties in FWNTs-polymer composites has remained elusive. In this…
A “co-precipitation” method was applied to introduce nanosized Co- and Ni-based catalysts to ammonia borane. It was observed that approximately 1 equiv. of hydrogen was evolved from the doped ammonia borane samples at a temperature as low as 59 °C. Moreover, the catalytic dehydrogenation did not present any induction…
The high temperature many-body density matrix is fundamental to path integral computation. The pair approximation, where the interaction part is written as a product of pair density matrices, is commonly used and is accurate to order tau squared, where tau is the step size in the imaginary time. Here we present a meth…
We determine the spin wave exchange stiffness $D$ and the exchange constant $A$ for the full Heusler compound \CFS using Brillouin light scattering spectroscopy. We find an extraordinarily large value of $D=715\pm20$ meV Å$^2$ ($A=31.5\pm1.0$ pJ/m) which is, to the best of our knowledge, only surpassed by the intermet…
This paper presents a lattice approach to model the influence of cracking on inviscid flow in concrete. A mechanical lattice model based on a damage-plasticity constitutive model was combined with a new dual lattice of conduit elements for flow analysis. The diffusivity of the conduit elements depends on the crack-ope…
We study the local density of states at and around a substituting impurity, and use these results to compute current versus bias characteristic curves of scanning tunneling microscopy (STM) experiments done on the surface of graphene. This allows us to detect the presence of substituting impurities on graphene. The ca…
A key challenge in synthesizing anisotropic nanocomposite magnets is to form crystallographic texture for R2Fe14B crystals in R-lean alloys (R=rare earth, R<10 at. %). Here, we demonstrate a (00l) texture development for Nd2Fe14B nanocrystals in a Nd-lean amorphous Nd9Fe85B6 under a hot deformation at a large u…
Abstract A method using a combination of ball milling, acid hydrolysis, and ultrasound was developed to obtain a high yield of cellulose nanofibers from flax fibers and microcrystalline cellulose (MCC). Poly(vinyl alcohol) (PVA) nanocomposites were prepared with these additives by a solution‐casting technique. The cel…
We present a novel technique for room temperature, solution-based fabrication of alternating current thin-film electroluminescent (AC-TFEL) devices using phosphor-doped nanocrystals. Synthesis for stable ZnSe/ZnS:Mn/ZnS nanocrystals that exhibit a quantum yield of 65 +/- 5% is outlined, and their electroluminescence i…
Bottlebrush copolymers are comblike macromolecules with densely grafted polymeric branches that adopt a cylindrical shape in solutions. We demonstrate a new method for the preparation of organic nanotubes by single molecule templating of core-shell bottlebrush copolymers. Multicomponent bottlebrush copolymers with wel…
We present a theoretical study on electronic structure and elastic transport properties of armchair graphene nanoribbon based junctions by using density functional theory calculations and nonequilibrium Green’s function technique. The I-V characteristics of various junctions are examined, which all exhibit robust nega…
Electrospun nanofibers can be readily assembled into various types of scaffolds for applications in neural tissue engineering. The objective of this study is to examine and understand the unique patterns of neurite outgrowth from primary dorsal root ganglia (DRG) cultured on scaffolds of electrospun nanofibers having…
Within the Landau-Ginsburg-Devonshire phenomenological approach we study the ferroic nanosystem properties changes caused by the flexoeffect (flexoelectric and flexomagnetic) existing spontaneously due to the inhomogeneity of order parameters. An exact solution for the spatially inhomogeneous mechanical displacement v…