Materials Literature
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Strong green and red visible emissions were obtained from ZrO2:Yb3+–Er3+ nanocrystals synthesized by sol-gel method and annealed at 1000 °C for 5 h. The average crystallite size was ∼70 nm with tetragonal phase for total concentration lower than 3 mol % and cubic phase for concentration higher than 5 mol %. The color…
The adsorption energies and growth morphology of silver on reduced CeO 2 (111) thin films at 300 K have been studied using adsorption microcalorimetry in combination with low energy ion scattering (ISS), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), electron energy loss spectroscopy (EELS)…
The crystal structures of the synthesized superhard diamondlike BC5 have been extensively explored through ab initio evolutionary algorithm. We uncovered seven intriguing low-energy structures all possessing sp3 hybridizations. After examining the dynamical stability, it is found that two Pmma structures (Pmma-1 and P…
We explore the effects of hydrogenated annealing on the crystal structure, room temperature ferromagnetism (RT-FM) and photoluminescence (PL) properties of Ni-doped ZnO (Zn1−xNixO, x=0.0 to 0.2) nanoparticles prepared by a sol-gel method. The x-ray photoelectron spectra and x-ray diffraction data provide evidence that…
B 4 C ceramics doped with different Si contents were fabricated by the spark plasma sintering technique. Pure B 4 C ceramic could be densified to 99% of the theoretical density. The sinterability could be further improved by the addition of a small amount of Si due to the formation of liquid Si during sintering. The i…
Is there a low-density region ("gap") between water and a hydrophobic surface? Previous x-ray and neutron reflectivity results have been inconsistent because the effect (if any) is subresolution for the surfaces studied. We have used x-ray reflectivity to probe the interface between water and more hydrophobic smooth s…
The intermediate-range order in peralkaline calcium aluminosilicate glasses is explored by two different models using solid-state 29 Si MAS NMR spectra as the main experimental basis. The two modeling approaches describe the spatial arrangement of the tetrahedral SiO 4 and AlO 4 units, that is, the intermediate-range…
This paper presents an experimental study into the effect of self-healing hollow fibres on the mechanical properties and delamination resistance of carbon-epoxy composite panels and bonded joints. Hollow fibres made using thin-walled glass tubes are used in microvascular self-healing systems for the storage and transp…
The objective of this investigation was to compare the toxicity of two manufactured carbon nanomaterials (CNs) to determine if shape influenced toxicity. Juvenile rainbow trout Oncorhynchus mykiss were fed a control diet (no CN addition), or a diet supplemented with 500 mg single-walled carbon nanotubes (SWCNT) kg(-1)…
Deciphering the molecular basis of toxicology mechanism induced by nanoparticles (NPs) remains an essential challenge. Ion Beam Analysis (IBA) was applied in combination with Transmission Electron Microscopy and Confocal Microscopy to analyze human keratinocytes exposed to TiO(2)-NPs. Investigating chemical elemental…
A random-phase-approximation semiclassical scheme for the description of plasmon excitations in large metallic nanospheres, with a radius range of 10--60 nm, is developed in an all-analytical version, with inclusion of irradiation phenomena. The spectrum of plasmons is determined for both surface- and volume-type exci…
Abstract The formation of functional tissue is strongly dependent on biochemical as well as physical signals. A common approach in tissue engineering is the application of passive scaffold systems with fixed morphology and stiffness. In this paper, we explored whether mechanically active scaffolds, exhibiting self‐suf…
The glasses of the composition 20CaF2–xAl2O3–(59−x)P2O5–20SiO2:1.0Ho2O3/1.0Er2O3 and 20CaF2–xAl2O3–(59−x)P2O5–20SiO2:(0.6Ho2O3+0.4Er2O3) with x varying from 2 to 10 mol % have been synthesized. Optical absorption and fluorescence spectra (in the spectral range 350–2100 nm were studied at ambient temperature. The Judd–…
The development of novel engineered nano-sized materials is a rapidly emerging technology with many applications in medicine and industry. In vitro and in vivo studies have suggested many deleterious effects of carbon nanotube exposure including granulomatous inflammation, release of cytosolic enzymes, pulmonary fibro…
Silica coatings with hierarchical structures were prepared on glass substrates via layer-by-layer assembly using hierarchically mesoporous silica nanoparticles as building block. These coatings demonstrated excellent superhydrophilic properties. After hydrophobic modification, the obtained coatings exhibited hydrophob…
We present a first-principles study of Peierls distortions in trans-polyacetylene, polyacene, and armchair $(n,n)$ carbon nanotubes. Our findings suggest that the ground-state geometries of armchair $(n,n)$ carbon nanotubes, with $n$ up to 6, exhibit a Peierls distortion as it is found for trans-polyactetylene. In con…
Zinc in: Polyoxometalate 1 reacts with Zn2+ ions in acetone to form a novel sandwich-type POM 2 in almost quantitative yield. The H2O2-based oxidation of secondary alcohols with 2 efficiently proceeds, with an activity and chemoselectivity that is very different from those of tungsten-based catalysts including 1 (see…
If engineered nanomaterials are released into the environment, some are likely to end up associated with the food of animals due to aggregation and sorption processes. However, few studies have considered dietary exposure of nanomaterials. Here we show that zinc (Zn) from isotopically modified (67)ZnO particles is eff…
In order to analyze the effect of strain on the magnetic properties of narrow-band manganites, temperature- and field-dependent susceptibilities of about 8.5-nm-thick epitaxial ${\text{Pr}}_{0.7}{\text{Ca}}_{0.3}{\text{MnO}}_{3}$ films, respectively, grown on (001) and (110) ${\text{SrTiO}}_{3}$ substrates, have been…
Density functional modeling of atomic structure and calculation of electronic structure of one-side one-sublattice functionalized graphene (graphone) are performed for hydrogen and fluorine adatoms. Shown that using of fluorine for functionalization not on enhance stability of compound but also provide switch of magne…