Materials Literature
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Cellulose nanocrystals (CNXLs) have drawn attention from researchers for their remarkable reinforcing abilities and excellent mechanical properties. CNXLs typically have high aspect ratios of around 20-50 (length/width), low density of around 1.6 g/cc, high stiffness (135 to 155 GPa), and strength (estimated at 7500 M…
We found by micromagnetic simulations that the motion of a transverse wall (TW) type domain wall in magnetic thin-film nanostripes can be manipulated via interaction with spin waves (SWs) propagating through the TW. The velocity of the TW motion can be controlled by changes of the frequency and amplitude of the propag…
Silicon nanoparticles are experimentally investigated as a potential hyperpolarized, targetable MRI imaging agent. Nuclear T_1 times at room temperature for a variety of Si nanoparticles are found to be remarkably long (10^2 to 10^4 s) - roughly consistent with predictions of a core-shell diffusion model - allowing th…
We study the changes in the Fermi surface with electron doping in the ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ superconductors with density-functional supercell calculations using the linearized augmented plane-wave method. The supercell calculations with explicit F substitution are compared with those obta…
This paper describes a novel solution-based chemical process to architect hollow spheres of β-Ni(OH) 2 with controllable sizes in submicrometer and micrometer regimes. In the synthesis, starting nickel salt (nitrate) is first converted to 6-coordinated nickel ion complex [Ni(EDA) 3 ] 2+ (bidentate ligand EDA = C 2 H 4…
The electromagnetic characteristics of Ni/ZnO nanocapsules were studied at 2–18 GHz. The dual nonlinear dielectric resonance and strong natural resonance at 16.6 GHz contribute to excellent electromagnetic absorption. A reflection loss (RL) exceeding −20 dB was calculated in 14–18 GHz for an absorber thickness of 2.05…
Single-crystalline Cu nanoplates with a prominent in-plane dipole surface plasmon band are fabricated through reduction of copper salt with hydrazine using PVP as stabilizer and no need for inert atmosphere. Due to the lower free-electron character of copper, the interband transitions overlap, and therefore damp, the…
Fully organic nanofiber lasers, made by a polymer matrix doped with gain molecules, are demonstrated. They exhibit emission in the visible and near infrared range (see image), supporting efficient waveguiding of the self-emitted light. Individual fibers can operate as optical cavities, emitting single-mode laser light…
A low melting point soda-lime glass powder containing copper nanoparticles with high antibacterial (against gram-positive and gram-negative bacteria) and antifungal activity has been obtained. Sepiolite fibres containing monodispersed copper nanoparticles (d(50) approximately 30 +/- 5 nm) were used as the source of th…
Homogeneous composites, or metamaterials, made of dielectric or metallic particles are known to show magnetic properties that contradict arguments by Landau and Lifshitz [Landau LD, Lifshitz EM (1960) Electrodynamics of Continuous Media (Pergamon, Oxford, UK), p 251], indicating that the magnetization and, thus, the p…
FeAs- single layer is tested as a simple model for LaFeAsO and BaFe2As2 based on first-principles calculations using generalized gradient approximation (GGA) and GGA+U. The calculated single- layer geometric and electronic structures are inconsistent with that of bulk materials. The bulk collinear antiferromagnetic gr…
Since nearly 4 decades, various theoretical behaviours have been found for the thermopower in the variable range hopping regime. In 1969, Cutler and Mott have predicted a linear variation with temperature T of the thermopower: S = const.T. In the seventies, it has beenfound by Zvyagin, Overhof and Mott that S = const.…
We report on the influence of stray fields for both low and high magnetic fields applied parallel to trilayers consisting of a low-T Nb interlayer and two outer Ni Fe layers having in-plane anisotropy. At low magnetic fields these trilayers exhibit a pronounced magnetoresistance effect. Its dynamic transport behavior…
The structure, thermodynamic and kinetic stability, and activity of cytochrome c (cyt c) on silica nanoparticles (SNPs) of different sizes have been studied. Adsorption of cyt c onto larger SNPs results in both greater disruption of the cyt c global structure and more significant changes of the local heme microenviron…
Abstract Sulfur doping of single‐walled carbon nanotubes and graphene is possible from a thermodynamic standpoint, according to DFT calculations. In the case of graphene, the doped sheet can be a small‐band‐gap semiconductor, as revealed by a plot of the band structure (see picture), or it can have better metallic pro…
Ionic liquids allow millimeter-long single-walled carbon nanotubes to associate tightly, forming a free-standing sheet with superb mechanical and electrical properties. An actuator strip, fabricated by sandwiching an ionic-liquid-gel electrolyte layer with the nanotubes sheets obtained exhibits a large deformation in…
Polyester synthesis by lipase catalyst involves two major polymerization modes: i) ring-opening polymerization of lactones, and, ii) polycondensation. Ring-opening polymerization includes the finding of lipase catalyst; scope of reactions; polymerization mechanism; ring-opening polymerization reactivity of lactones; e…
Chitin, chitosan, and their derivatives have been identified as versatile biopolymers for a broad range of agriculture and food applications. Up to now, several methods have been developed to determine degree of N-acetylation, DA, for chitin and chitosan. In this article, an effort has been made to review the availabl…
Highly efficient green-light-emitting diodes (LEDs) based on [email protected] quantum dots (QDs) with a chemical-composition gradient are demonstrated. Through the moderate control of QD coverage in multilayered devices, excellent device performance has been achieved. The color-saturated green-light emission (see fig…
Nanosilver is increasingly used in the food industry and biomedical applications. A lot of studies have been done to investigate the potential toxicity of nanosilver. But information on whether or how nanosilver particles bring changes in genetic materials remains scant. In this study, the replication fidelity of the…