Materials Literature
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We present a theoretical description of electron irradiation of single-walled carbon and boron nitride nanotubes. In a first step, the anisotropy of the atomic emission energy threshold is obtained within extended molecular-dynamics simulations based on the density-functional tight-binding method. In a second step, we…
The paper presents a critical overview on magnetic nanoparticles and microspheres used as separation media in different fields of chemistry, biochemistry, biology, and environment protection. The preparation of most widely used magnetic iron oxides in appropriate form, their coating or encapsulation in polymer microsp…
The controllable synthesis of nanocrystals with different shapes is very important and challenging. In the present work, silver nanoparticles with different structural architectures, from nanorods, triangular plates, hexagonal plates, and nanocubes to polyhedrons have been synthesized successfully in high yield by a s…
Nanoparticles, such as liposomes, polymeric micelles, lipoplexes and polyplexes are frequently studied as targeted drug carrier systems. The ability of these particles to circulate in the bloodstream for a prolonged period of time is often a prerequisite for successful targeted delivery. To achieve this, hydrophilic '…
Collagens are a large family of triple helical proteins that are widespread throughout the body and are important for a broad range of functions, including tissue scaffolding, cell adhesion, cell migration, cancer, angiogenesis, tissue morphogenesis and tissue repair. Collagen is best known as the principal tensile el…
La sorption des ions chromate de solutions aqueuses sur une hydrotalcite de synthèse et sur son produit de calcination a été étudiée. L’interaction de ces matériaux avec les ions chromate montre que la cinétique de sorption est rapide et suit une expression de vitesse de sorption réversible du premier ordre. Les influ…
Uniform single-crystalline ZnO microflower with well-defined multilayer spiny petals and hexangular prism pistil have been successfully prepared through the surfactant-assisted self-assembly route at 60 °C. For the as-prepared product, three emitting bands were observed, of which included a very strong and broad green…
Abstract We grew vertically aligned CNTs via HFCVD using mixtures of methane and hydrogen as feedstock, and investigated the dependence of CNT growth on feedstock composition, filament temperature, and filament types. At the filament temperature of 2050 °C tungsten filaments were more efficient for CNT growth than tan…
The authors demonstrated an investigation of the real-time growth of ZnO nanosheets via in situ observation in an environmental scanning electron microscope. It was found that ZnO nanosheets were grown in a two-stage process: [21¯1¯0]-oriented nanowires were grown first, and then ZnO nanosheets grew perpendicularly on…
Atomic scale modeling methods are used to investigate the relationship between the properties of clusters of nanometer size and the materials that can be synthesized by assembling them. The examples of very different bimetallic systems are used. The first one is the ${\mathrm{Ni}}_{3}\mathrm{Al}$ ordered alloy and the…
Thin films of Bi3.15Nd0.85Ti3O12(BNT) and BNT with various TiO2 seeding layer thicknesses BNT-Tx (x = 10, 20, 30 nm) were fabricated on Pt/Ti/SiO2/Si substrates by the sol–gel method. The influence of the TiO2 seeding layer thickness on the structural and the electrical properties of BNT thin films was investigated. T…
The optical properties of chiral nematic liquid crystal devices have been accurately measured and modelled across the visible spectrum. The devices studied are identical in construction to those that employ the electro-optic properties of chiral nematic materials, including reflective displays, electrically controlled…
The cream layer is a complex heterogeneous material of biological origin which forms spontaneously at the air–milk interface. Here, the crumpling of a single cream layer packing under its own weight at room temperature in a three-dimensional space is studied. The structure obtained in these circumstances has a low vol…
Pb ( Zr 0.4 Ti 0.6 ) O 3 thin films with a thickness of 500nm were spin coated on (110) preferred Pt bottom electrodes using a sol-gel method, in which the (110) preferred Pt bottom electrode was developed by using a (100)-oriented conductive oxide electrode LaNiO3 film as an adhesion layer on a SiO2∕Si substrate. X-r…
Addition of hydrogen (H2) during the sputter deposition of BaTiO3 amorphous thin films drastically modifies their dielectric properties. Films grown under hydrogen containing atmospheres display large capacitances (several μF∕cm2 for 1μm thick films), that are hundred times higher than capacitances measured for films…
Abstract New thermotropic liquid crystalline (LC) hyperbranched (HB) polyesters containing 2,5‐diphenyl‐1,3,4‐thiadiazole (DTD) unit as mesogen in the interiors were prepared at various mole ratios (A 2 /B 3 ) by melt and solution polycondensations of a dioxydiundecanol of DTD (A 2 ) and 1,2,3‐propanetricarboxylic aci…
High quality LaOFeP superconducting materials have been successfully synthesized by a two-step solid reaction method. We first prepared a La–Fe–P ternary alloy following a pre-alloying treatment; the resultant La–Fe–P ternary alloy was found to be the key precursor for producing the final LaOFeP superconductors in our…
The polarization state of the diffraction light from the polarization holographic grating on varying the polarization conditions of the writing beams has been investigated on the basis of Jones theory. The authors found that the polarization holographic grating, which was fabricated by irradiating the two writing beam…
Theoretical understanding on the formation of nanotube following the Kirkendall effect is developed. The relations for growth rate of the product phase and consumption rate of core and shell are derived considering diffusion-controlled process. The controlling factors to produce good nanotube following the Kirkendall…
Polycrystalline thin films of ZnS x Se 1− x with x = 0, 0.25, 0.5, 0.75 and 1.0 have been synthesized using close-spaced evaporation. The films were deposited onto glass substrates at different substrate temperatures in the range 200–400 °C. The grown films were characterized using XRD, AFM, EDAX and UV–Vis–NIR spectr…