Materials Literature
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Abstract Although wood–plastic composites have become more accepted and used in recent years and are promoted as low‐maintenance, high‐durability building products, they do experience a color change and a loss in mechanical properties with accelerated weathering. In this study, we attempted to characterize the modulus…
Electrospinning has developed as a unique and versatile process to fabricate ultrathin fibers in the form of nonwoven meshes or as oriented arrays from a variety of polymers. The very small dimension of these fibers can generate a high surface area, which makes them potential candidates for various biomedical and indu…
We report experimental data on two types of natural silica, differing for their OH content, irradiated with UV photons (4.66 eV) from a pulsed Nd:YAG laser. Irradiation induces a reduction of the absorption band at 5.12eV and of the associated emissions at 3.14eV and 4.28eV, ascribed to twofold coordinated Ge (=Ge'')…
The question addressed is whether magnetic materials based on physical small world networks are possible. Physical constraints, such as uniform bond length and embedding in three dimensions, are the new features added to make small world networks physical. Results are presented to further determine if physical small w…
We investigated the kinetics of H(II) centers (=Ge'-H) in natural silica under repeated 266nm UV irradiations performed by a Nd:YAG pulsed laser. UV photons temporarily destroy these paramagnetic defects, their reduction being complete within 250 pulses. After re-irradiation, H(II) centers grow again, and the observed…
Density-functional studies of the electron states in the dilute magnetic semiconductor $\mathrm{GaN}:\mathrm{Mn}$ reveal major differences for the case of the $\mathrm{Mn}$ impurity at the substitutional site $({\mathrm{Mn}}_{\mathrm{Ga}})$ versus the interstitial site $({\mathrm{Mn}}_{\mathrm{I}})$. The splitting of…
A continuum (Mullins-type) model is formulated for the isotropic evolution of a solid surface on which the mass transport occurs by oscillatory surface diffusion. The time-space oscillations of diffusivity are assumed to be induced by external source(s); a number of possible sources, different in their physical nature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleHigh Magnetic Fields: A Tool for Studying Electronic Properties of Layered Organic MetalsMark V. KartsovnikView Author Information Walther-Meissner-Institut, Bayerische Academie der Wissenschaften, Walther-Meissner-Strasse 8, D-85748 Garching, Germany Cite this: Chem. Rev. 2004,…
The crystal and molecular structure, together with the hydrogen-bonding system in ammonia-mercerized cellulose III I, has been determined using synchrotron X-ray and neutron fiber diffraction data. The structure has a one-chain monoclinic unit cell with an asymmetric unit that contains only one glucosyl residue and wi…
High quality MgO/Fe 3 O 4 core−shell nanowires have been successfully synthesized by depositing an epitaxial shell of Fe 3 O 4 onto single crystal MgO nanowires. The material composition and stoichoimetric ratio have been carefully examined and confirmed with a variety of characterization techniques. These novel struc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Molecular ConductorsEugenio Coronado and Peter DayView Author Information Institut de Ciència Molecular de la Universitat de Valencia, C/Doctor Moliner 50, 46100 Burjassot, Spain, and Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albem…
Room-temperature ferromagnetism is observed in (110) oriented ZnO films made from targets containing 5 at. % of Sc, Ti, V, Fe, Co, or Ni, but not Cr, Mn, or Cu ions. There are large moments, 2.6 micro(B) and 0.5 micro(B)/dopant atom for Co- and Ti-containing oxides, respectively. There is also a moment of 0.3 micro(B)…
Ultrathin, uniform single-walled carbon nanotube networks of varying densities have been fabricated at room temperature by a vacuum filtration method. Measurements of the sheet conductance as a function of nanotube network density show 2D percolation behavior. In addition, the network transparency in the visible spect…
We report the quadratic hyperpolarizability βs of newly synthesized chirals carboxylates salts. These nonlinear optical coefficients have been measured using Hyper-Rayleigh scattering (HRS) technique in solution. Before nonlinear measurements, the different compounds under study were characterized by resonance ma…
Feldspar is being used herein as a filler in natural rubber vulcanizates. Two different types of natural rubber, SMR L and ENR 50 having 0 and 50 mol% of epoxide groups and semi-efficient vulcanization were used. The scorch time, (t2) and cure time, (t90) of both rubber vulcanizates slightly increased with increasing…
Abstract Poly(epoxy imide)s were prepared by a reaction between a hydroxyl‐group‐containing soluble copolyimide and commercial epoxy resins at 220 °C for 2 h. Poly(epoxy imide) thin films exhibited higher thermal stability and lower dielectric constants than a commercial flip‐chip package material (U300). The thermal…
Abstract The nucleophilic substitution reactions on poly(vinyl chloride) (PVC) with potassium 4‐acetamidothiophenolate, potassium 2‐naphthalenethiolate, and sodium 2‐mercaptobenzothiazolate have been undertaken in a cyclohexanone solution. The aim was to study, from a comparative point of view, the influence of nucleo…
Magnesium hydroxide sulfate hydrate nanoribbons have been synthesized by a solution-phase approach, which is based on the treatment of freshly precipitated magnesium hydroxide in an alcohol–water solution containing high concentrations of magnesium sulfate. These nanoribbons had typical lengths up to the micrometre ra…
Liposomes for drug delivery are often prepared with maleimide groups on the distal end of PEG to enable coupling of homing devices, such as antibodies, or other proteins. EDTA is used to stabilize the thiol group in the homing device for attachment to the maleimide. However, when using a homing device that contains a…
By using a combination of atomic force and confocal microscopy, we explore the deformation properties of multilayer microcapsules filled with a solution of strong polyelectrolyte. Encapsulation of polyelectrolyte was performed by regulation of the multilayer shell permeability in water-acetone solutions. The "filled"c…