Materials Literature
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Hexagonal ZnO nanocrystals were synthesized through a hydrothermal route under mild conditions (growth temperature of 90°C at atmospheric pressure). Pre-synthesized ZnO nanoparticles were used to serve as nucleation sites for the growth of the nanocrystals. The growth of ZnO nanorods was found to be surface independen…
In order to investigate the effect of continued equal channel angular pressing (ECAP) with different routes and passes on the homogeneity of structure, the process of continued ECAP for pure aluminum bar was simulated by DEFORM-3D software. It obtains the load-stroke curves for different passes, distribution of effect…
Abstract Mechanical alloying (MA) and subsequent solid sintering process was used to prepare the Nd‐containing magnetostrictive Tb 0.4 Nd 0.6 ‐(Fe 0.8 Co 0.2 ) 1.90 alloy. The structure, thermal stability and phase transformation were investigated as functions of composition, milling process and annealing temperature.…
Thermoplastic elastomers based on blending of epoxidized natural rubber with 30 mol% epoxide (ENR-30) with polyamide-12 (PA-12) (i.e., ENR-30/PA-12) and blending of ENR-30 with co-polyamide-12 (ENR-30/CO-PA-12) were prepared by dynamic vulcanization technique. It was found that the dynamically cured ENR-30/PA-12 blend…
Thermoplastic vulcanizates (TPVs) based on epoxidized natural rubber (ENR) and polypropylene (PP) were prepared in an internal mixer at 180°C. The effects of curing systems (i.e., sulfur and peroxide) on morphological, rheological, thermal and mechanical properties were studied. It is found that the sulfur cured TPVs…
Two configurations of perfect single walled carbon nanotubes (armchair and zigzag) were simulated based on the finite element method. Then, three most likely defects (Si-doping, carbon vacancy and perturbation) were introduced to the models to represent defective forms of single walled carbon nanotubes (SWCNTs). Final…
New simulation algorithm of soot oxidation in diesel particulate filter (DPF) is proposed. Two-dimensional finite differences scheme is used for calculation of the heat transfer in DPF (macro-scale). One dimensional model for treatment of the soot oxidation process in a separate filter channel (micro-scale) is based o…
The melting, crystallization behavior, morphology and mechanical properties of poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT)/calcium carbonate (CaCO3) composites were investigated by means of differential scanning calorimetry (DSC), scanning electron microscopy(SEM), and mechanical test. It is…
Metals have many extraordinary optical properties. However, thick metals are nice mirrors, which prevent light penetrating deep into them. Since the skin depth is very thin, most optical properties of bulk metals are unavailable. In this paper, we review the way of reducing reflections in thick metal slabs by coating…
The Landau theory of phase transitions with a two-component order parameter is used to systematically calculate the structures and phase diagrams of polar liquid crystals. Commensurate and incommensurate structures with a layer-type period form as a result of a frustration interaction. Phase diagrams are calculated wh…
Abstract The slip‐rolling resistances of hard and stiff thin films under high Hertzian contact pressures can be improved by optimizing the “coating/substrate systems”. It is known from former investigations that the so‐called “egg‐shell” effect is no general hindrance for high slip‐rolling resistance of thin hard coat…
A method of fabricating dual-band left-handed metematerials (LHMs) is investigated numerically and experimentally by single-sided tree-like fractals. The resulting structure features multiband magnetic resonances and two electric resonances. By appropriately adjusting the dimensions, two left-handed (LH) bands with si…
In this article, successfully electrochemical copolymerization of the 1,4-bis(3-methylthiophen-2- yl)benzene (BMTB) monomer and the 1,4-bis(2-(3,4-ethylenedioxy)thienyl)benzene (EBE) monomer is used to fulfill a strategy in achieving desired fine tuning band gap copolymer. Cyclic voltammetry (CV), UV–vis, FT-IR and SE…
For rapid screening nano size biomolecules, a device must be designed in nano sizes, compact and ultra-high sensitive. The most interesting function of the devices is to transduce the binding of biomolecules and devices into electrical signals for further analysis. Over the past few years, nanostructures have emerged…
We have theoretically demonstrated that hybridization of phonon modes in Si/Ge core/shell nanowires and corresponding decrease of average phonon group velocity lead to the suppression of phonon thermal conductivity in Si/Ge core/shell nanowires in comparison with generic homogeneous silicon nanowires. The phonon energ…
The 5-10 nm Ce(1-x)Eu(x)O(2-delta) (0 < or = x < or = 0.30) nanoparticles with fluorite structure were synthesized by thermal decomposition of Eu- and Ce-2,4-pentanedione complexes mixtures. X-ray line broadening analysis of mixed samples Ce(1-x)Eu(x)O(2-delta) (0.05 < or = x < or = 0.30) showed that the crystallite s…
A method to manage the resistivity of n-type ZnO films is presented. It involves the controlled diffusion of Zn at low temperature in N2 atmosphere into the ZnO/Zn/ZnO structure. The structures were made by DC sputtering technique. The diffusion periods were varied from 5 to 30 min. This process allow us to obtain ZnO…
Borohydrides have been recently hightlighted as prospective new materials due to their high gravimetric capacities for hydrogen storage. It is, therefore, important to understand the underlying dehydrogenation mechanisms for further development of these materials. We present a systematic theoretical investigation on t…
The character and products of the thermal decomposition of metal formate dihydrates of Mn-Zn series were studied in carbon dioxide atmosphere under different pressures.
The problem of electronic states of epitaxial graphene formed on the surface of a metal substrate has been considered. The electronic states of epitaxial graphene have been studied taking into account the indirect interaction of its atoms through the electron gas of the substrate.