Materials Literature
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A glassy state of matter results if crystallization is avoided upon cooling or increasing density. However, the physical factors controlling the ease of vitrification and nature of the glass transition remain elusive. Using numerical simulations of polydisperse hard disks, we find a direct relation between medium-rang…
BiFeO 3 nanoparticles prepared by a modified Pechini method display strong size-dependent properties. The rhombohedral distortion from cubic structure is reduced by decreasing particle size accompanied by decreasing polarization inferred from atomic displacements found by Rietveld refinement of X-ray powder diffractio…
We present a mechanism for the recently discovered magnetoresistance in disordered pi-conjugated materials, based on hopping of polarons and bipolaron formation, in the presence of the random hyperfine fields of the hydrogen nuclei and an external magnetic field. Within a simple model we describe the magnetic field de…
Using the semiclassical Boltzmann theory, we calculate the conductivity as a function of the carrier density. We include the scattering from charged impurities but conclude that the estimated impurity density is too low in order to explain the experimentally observed mobilities. We thus propose an additional scatterin…
DOI: 10.1002/mabi.200500062 The author would like to announce the following correction. Figure 1 contains some errors with respect to the polymer configurations. 1) Page 571, Figure 1 The author apologizes for any inconvenience caused.
We demonstrate that the electronic gap of a graphene bilayer can be controlled externally by applying a gate bias. From the magnetotransport data (Shubnikov-de Haas measurements of the cyclotron mass), and using a tight-binding model, we extract the value of the gap as a function of the electronic density. We show tha…
Nanocarbon-derived electron emission devices, specifically nanodiamond lateral field emission (FE) diodes and gated carbon nanotube (CNT) triodes, are new configurations for robust nanoelectronic devices. These novel micro/nanostructures provide an alternative and efficient means of accomplishing electronics that are…
Most of the synthesising methods of gold nanoplates reported to date rely heavily on the use of chemical reducing agents such as N, N-dimethylformamide, sodium borohydride or other organic compounds. All of these chemicals are highly reactive and may pose potential biological risks. A simple, convenient and economical…
Abstract Structural data produced by a 2‐ns molecular dynamics (MD) simulation on Geobacillus alanine racemase (AlaR; PDB: 1SFT) was used to study hydration around the two AlaR active sites. AlaR is a crucial enzyme for bacterial cell wall biosynthesis. It has been shown previously that the potency of an inhibitor can…
ABSTRACT Tensile and fatigue crack growth tests of 2205 duplex stainless steel (DSS) were performed in laboratory air, gaseous hydrogen at 0.2 MPa and saturated H 2 S solution. The longitudinal specimen showed a lesser degradation of tensile properties than the transverse ones in saturated H 2 S solution. The orientat…
Polymer nanocomposites are polymer matrix composites in which the reinforcement has at least one of its dimensions in the nanometer range (1 nanometer (nm)¼ 103 mm (micron)¼ 109 m). These composites show great promise not only in terms of superior mechanical properties, but also in terms of superior thermal, electrica…
White and tunable electroluminescence has been obtained by field effect injection in 40nm thick Si- and C-rich SiO2 layers. The films, synthesized by ion implantation, contain Si and C-rich nanoparticles embedded in SiO2 which were formed by annealing at 1100°C. Shifting of the distribution of C-related centers toward…
Abstract The effect of weight‐average molecular weight ( M w ) on the nonisothermal crystallization kinetics of linear metallocene polyethylene (m‐PE) was studied with modulated differential scanning calorimetry. Six linear m‐PEs of molecular weights in the range 122–934 kg/mol were prepared by gas‐phase polymerizatio…
The purpose of this paper is to display the influence of isoalkanes on the structure and mechanical properties of waxes. This work was carried out by means of X-ray diffraction, differential thermal analyses, and dynamic mechanical analyses. Isoalkanes coming from an industrial wax were added in different quantities t…
The design of aperiodic reflecting multilayer (ML) structures for attosecond physics in the extreme ultraviolet spectral region is presented. An optimization procedure based on "evolutive strategy" has been developed in order to get coating structures reflecting high photon fluxes in ultrashort duration pulses. The ML…
Carbon-based materials offer a number of exciting possibilities for both new science and applications. Many of these are based on the novel band structure of graphene, by which solids mimic the properties of relativistic fermions and which offers the potential for high speed nanoscale electronics. When sheets of graph…
Functional arrays of microplasmas were designed for the purpose of controlling electromagnetic waves in the range 10–100 GHz. A two-dimensional square-lattice array of microplasma columns was proved to have photonic-crystal-like properties showing the presence of photonic band gaps and flat bands. A one-dimensional li…
The nucleation and growth of polystyrene (PS) nodules on 170 nm silica seeds under emulsion-polymerization conditions have been investigated for the first time by cryo-electron tomography. 3D arrangements were reconstructed from samples collected at several polymerization times (from 5 to 120 min). Early samples displ…
ABSTRACT The effect of cerium (Ce) on high‐cycle fatigue behaviour of die‐cast magnesium alloy AZ91D was investigated. Mechanical fatigue tests were conducted at the stress ratio, R = 0.1 on specimens of AZ91D alloys with different Ce additions. The microstructure and fatigue fracture surfaces of specimens were examin…
Abstract Inorganic fillers are widely used in coatings, paints, printing inks, and papermaking. A general problem in such applications is the poor compatibility and weak bondability of the filler with polymeric substrates. Surface modification and encapsulation are common methods adapted to enhance interactions betwee…