Materials Literature
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A multistage chemical method based on nanosphere lithography was used to produce hexagonally patterned arrays of ZnO vertical nanowires, with 1 μm interspacing and aspect ratio ∼20, with a view to study the effects of emitter uniformity on the current emitted upon application of a dc voltage across a 250 μm vacuum gap…
Starting with the ingot with a nominal stoichiometric composition of SmCo9.8, the nanocrystalline bulk with ultrafine nanograin structure was prepared by a route combing ball milling and spark plasma sintering. The phase formation, microstructure, crystal lattice characteristics, and magnetic performance of the nanocr…
Ionization and displacement effects are basic phenomena in damage processes of materials under space-particle irradiation. In this paper, the damage behaviors were investigated on the polyimide under proton irradiation using electron paramagnetic resonance (EPR) spectra analysis and optical absorbance valuation. The r…
A cosolvent-free sol–gel method to prepare monolithic transparent silica glasses doped by rare-earth ions at high concentrations has been developed. Despite the simple solution composition, the reaction mixture undergoes a macroscopic phase separation in parallel with the gelation, and the resultant macropores make it…
Electrospinning is an easy and inexpensive process that produces continuous nanofibers through an electrically charged jet of polymer solution consisting of sufficiently long chain molecules. As reported in the literature, the entire electrospinning process is governed by the external electric field caused by the appl…
Abstract A multiwalled carbon nanotubes (MWCNTs) were carboxylated after refluxing with sulfuric and nitric acids. These attached carboxylic acid groups were further condensated with o ‐phenylene diamine into amide catalyzed by dicyclohexyl carbodiimide (DCC). The obtained amidized MWCNTs were in situ ‐polymerized wit…
Abstract Self‐assembled In (Indium)‐doped ZnS nanowire bundles were synthesized via a thermal evaporation method without using any template. Vapor ‐ solid homoepitaxial growth was found to be the key reason for the formation of close‐packed nanowire bundles grown on the surface of microscale sphere‐shaped ZnS crystal.…
The morphology, taxonomy, and distribution of species belonging to the diatom family Rhizosoleniaceae were studied from the marine coastal waters of Korea. Rhizosolenid diatom taxa were collected at 30 sites from September 2008 to February 2010 and were analyzed by light and scanning electron microscopy. We identified…
We present a nonlinear thermodynamic formalism coupled with an electrostatic analysis of uniaxial n-layered compositionally graded heteroepitaxial ferroelectric films and extend this formalism to continuously graded ferroelectric films. We show that the domain morphology and its subsequent evolution in the presence of…
The photovoltaic (PV) generators are a major element of PV power systems, characterized by a low conversion ratio.This accounts for the necessity to study the current-voltage and power-voltage characteristics of PV sources in order to obtain maximum power output when there are changes both in the modules themselves an…
Strong modifications of semiconductors can be provoked by high-density electronic excitation. We report on surface structuring of monocrystalline wurtzite O-face (0001) ZnO excited by UV femtosecond laser pulses (248 nm) below the ablation threshold. At fluences above 11 mJ/cm2, nanoholes of D=10 nm diameter appear qu…
The photosensitivity of germanium free Bi-Al-doped silica fibers with different bismuth concentrations was investigated using ArF excimer laser radiation at 193 nm and fiber grating formation. For the fiber with the highest bismuth concentration maximum refractive index changes of 2.2 × 10(-3) and 2.0 × 10(-4) were ob…
Self-doped perovskite manganites with nominal composition La0.8−xSr0.2MnO3−δ (0 ≤ x ≤ 0.20) have been prepared by the sol-gel method. The highest heat treatment temperature used was 1073 K. The x-ray diffraction (XRD) patterns indicate that the samples had a single phase with the ABO3 perovskite structure when the dop…
OBJECTIVES: A novel technique based on plasma immersion ion implantation (PIII) is presented to modify titanium implant surfaces. MATERIALS AND METHODS: Initially, the implants are cleaned with argon to remove contaminants and the nanostructures are created by the bombardment of the surface with a mix of noble gases.…
In this paper, the influence of the mechanical properties of rubber substrate on frictional behavior of DLC-protected rubber is studied by numerical methods. The viscoelastic contribution to the friction during a tribotest was simulated according to a “mattress” approach composed by Voigt or standard linear solid unit…
By developing the mode matching numerical technique, we investigate the ballistic phonon thermal transport through a cylindrical semiconductor nanowire modulated with a coupling nanocavity. It is found that the phonon transmission exhibits the periodical transmission properties in low frequency region. The resonant tr…
We have studied the angular-dependent de Haas-van Alphen oscillations of LaRu${}_{2}$P${}_{2}$ using magnetic torque in pulsed magnetic fields up to 60 T. The observed oscillation frequencies are in excellent agreement with the geometry of the calculated Fermi surface. The temperature dependence of the oscillation amp…
In this paper, the influence of the viscoelastic properties of rubber substrate on the tribological behavior of DLC film-coated alkyl acrylate rubber is studied. The mechanical behavior of the rubber was first characterized by creep experiments using spherical indentations. The results were adjusted using a delayed el…
Without any template or surfactant, a facile d -penicillamine assisted solvothermal method was developed for large-scale synthesis of hierarchical PbS microstars with octa-symmetric-dendritic arms along the ⟨111⟩ direction in the water/ethanolamine (EA) solution. In this process, d -penicillamine was used as both a su…
Two new hybrid organic-inorganic molybdates based on layered (2/∞)[Mo(n)O(3n+1)](2-) blocks and organoammonium cations (+)(Me(x)H(3-x)N)(CH(2))(6)(NH(3-x)Me(x))(+) (x = 0-1), namely, (H(3)N(CH(2))(6)NH(3))[Mo(7)O(22)]·H(2)O (1) and (MeH(2)N(CH(2))(6)NH(2)Me)[Mo(9)O(28)] (2), have been synthesized under hydrothermal co…