Materials Literature
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We report an experimental study of carbon nanotube (CNT) growth via catalytic pyrolysis of acetylene. Surface free energy is shown to play a key role in determining the catalytic activity of the liquid droplet on the CNT tip and to be responsible for the constant nanotube diameter. A vapor-liquid-nanotube model is pro…
Swift heavy ion (SHI) (energy > 1 MeV/u) irradiation of polymer nanostructures is a novel technique to tailor their structure and properties. Polyaniline nanofibers synthesized by interfacial polymerization using HCl and camphor sulfonic acid (CSA) as dopants have been irradiated with 90 MeV O 7+ ion at different f…
Corrosion behaviors of X80 pipeline steel were investigated in different simulated alkaline soil solution using electrochemical test, EDS coupled to SEM and weight loss method. The results showed uniform corrosion was happened on X80 steel in Shanshan and Hami simulated solution, and local corrosion was the main failu…
Chalcogenide glasses or amorphous semiconductors are materials applicable in the field of optoelectronics. Microstructural and thermal analyses can provide useful information to understand the physical behavior of such materials. This paper is devoted to exploring the localized microstructural growth and kinetics of S…
The string model for the glass transition can quantitatively describe the universal α-relaxation in glassformers. The string relaxation equation (SRE) of the model simplifies the well-known Debye and Rouse—Zimm relaxation equations at high and low enough temperatures, respectively. However, its initial condition, nece…
Multiwalled carbon nanotubes (MWCNTs) with unusual rough surfaces (including pits) have been synthesised by the chemical vapour decomposition process of acetylene using a novel Ca3(PO4)2–CaCO3 support mixture. An Fe–Co bimetallic mixture (50 : 50, w/w) was impregnated (5 wt% loading) onto either Ca3(PO4)2 to give <1%…
Abstract Polarization properties of individual silicon nanowires are studied using an optical micro‐spectroscopy setup equipped with a Fresnel rhomb to rotate the polarization of the exciting laser and the analyzer to characterize the polarization of emitted photoluminescence. The Si nanowire samples are prepared by e…
In this study, a finite element model of a representative volume element that contains a hollow and filled single-walled Carbon nanotube (SWCNT) in two case studies was generated. It was assumed that the nanocomposites have geometric periodicity with respect to local length scale and the elastic properties can be repr…
Abstract Oscillatory zoning in solid solutions of alums ((K,NH 4 )Al(SO 4 ) 2 ·12H 2 O, K(Al,Cr)(SO 4 ) 2 ·12H 2 O, (K,Rb)Al(SO 4 ) 2 ·12H 2 O) and nitrates of divalent metals ((Sr,Pb)(NO 3 ) 2 , (Ba,Pb)(NO 3 ) 2 ) grownfrom low-temperature aqueous solutions is considered. The zoning is detected by means of X-ray diff…
Abstract The nonlinear optical properties of silicon nanocrystals (Si‐nc) embedded in oxide matrices have been studied in samples obtained by three different technological process: e‐beam evaporation, plasma enhanced or low pressure chemical vapor deposition (PECVD and LPCVD, respectively). Z ‐scan measurements were p…
The results of studying reaction sintering under pressure in the B 4 C-TiH 2 system have been discussed. It has been shown that the material structure consists of the B 4 C matrix phase and intergranular phase of titanium diboride (borocarbide) having a small mutual solubility of components. Physicomechanical properti…
Abstract Porous silicon and similar materials, like micro‐ and nanocrystalline silicon, are nowadays studied not only in physical research (e.g. optical gain studies, electro‐optical devices, solar energy conversion), but they are very promising also in biological research as fluorescent labels, biological sensors, dr…
Lead glass that shows a high refractive index is the best known and most popular for radiation shielding glass. Due to the toxic of lead compounds on the human organisms as well as the environmental issues, lead free glass was fabricated by using some heavy elements such as barium and bismuth to replace lead. In this…
Uniformly oxygen doping into phase change materials (PCMs) will increase their crystallization temperatures, but natural oxidation of PCMs has an opposite effect. Mechanism of oxidation for Si 2 Sb 2 Te 5 was studied by in situ X-ray photoelectron spectroscopy, employing an oxygen content gradient sample. During an ox…
In order to enhance transmittance in the long-wavelength infrared range, the major parameters of periodic sub-wavelength structures (SWS) with square holes on zinc sulfide (ZnS) substrates are designed and analyzed for applications in normal incidence by using rigorous coupled-wave analysis (RCWA) and thin film theory…
We report the evolution of titanium dioxide nanostructures when Au nanoparticles, supported on single crystal TiO(2) substrates, were heated under ∼260 Pa of flowing O(2) in an environmental transmission electron microscope. Nanostructures with different morphologies were first observed around 500°C. Our measurements…
Five compositions of the system As 25 Se 75-x Tl x (x = 12, 16, 20, 24 and 28%) have been prepared using melt quench technique. Thin films of the same thickness (200 nm) were deposited by electron beam evaporation technique. Optical and other parameters of the films have been studied. The optical band gap E op found t…
Semiconductor quantum dots (QD) are a class of NP with photophysical properties that are ideally suited for optical multiplexing and use as donors in fluorescence resonance energy transfer (FRET). A new strategy is presented for the development of multiplexed DNA hybridization assays using immobilized QDs in a microfl…
Special crystallization event of isotactic polypropylene (iPP) in a constrained environment, a layered clay network, was followed by in situ Fourier transform infrared (FTIR) spectroscopy during the cooling process. Before occurrence of nucleation/crystallization, a conformationally ordered phase, which consists of si…
Variations of the lattice constant and the value of elastic strain in 50 μm foil of Pd-5.3 at %-In-0.5 at %-Ru alloy in the course of its prolonged relaxation under normal conditions after electrolytic hydrogenation were analyzed using the X-ray diffraction technique. Nonmonotonic variations of the concentration of in…