Materials Literature
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Hexagonal-phase NaYF(4):Yb, Er/Tm nanocrystals are the best IR-to-visible upconverting materials to date, but user-friendly methods for making pure hexagonal-phase NaYF(4):Yb, Er/Tm nanocrystals with upconversion fluorescence are still lacking. Most of the methods reported so far require excess fluoride reactants in a…
Based on density functional calculations, optimized structures of graphite oxide are found for various coverages by oxygen and hydroxyl groups, as well as their ratio corresponding to the minimum of total energy. The model proposed describes well-known experimental results. In particular, it explains why it is so diff…
In this paper, we propose a random walk model as the main generation. mechanism for low-frequency noise in ZnO nanorod structures where surface states are involved. In this model, electrons in the channel can be trapped at surface states and perform a random walk between different surface states before being detrapped…
A high resolution soft x-ray photoelectron spectroscopic study of Ga and As 3d core levels has been conducted for Fe∕GaAs (001) as a function of Fe thickness. This work has provided unambiguous evidence of substrate disrupting chemical reactions induced by the Fe overlayer—a quantitative analysis of the acquired spect…
When a metal nanoparticle exhibits its unique dipole plasmon resonance, optical properties can be treated by considering a point dipole. Here we established a strong correlation between the surface-plasmon-induced coupled electric field in nanoparticle arrays and the extinction peak shifts. The model provides an effec…
The driving force for formation of a surface relief grating on an azobenzene-containing polymer is theoretically analyzed and experimentally confirmed by polarization analyses. We formulate the driving force based on the Coulomb interaction between an optical electric field and its induced polarization charges. The fo…
The remanent polarization reduces monotonically with the rising temperature from 295to430K in Pt∕IrO2∕Pb(Zr0.4Ti0.6)O3∕IrO2∕Pt thin-film capacitors, although the saturation polarization of the films is nearly constant in the temperature range. Fast-pulse measurements of polarization retention shortened on the order of…
Abstract Two acrylate monomers – 4‐(2′‐methoxycinnamoyl)phenyl acrylate, and 4‐(2′,5′‐dimethoxycinnamoyl)phenyl acrylate – comprising photocrosslinkable pendant chalcone moiety and a free radical polymerizable group were synthesized. The monomers were polymerized in the presence of ethyl methyl ketone at 70°C using be…
Sol-gel derived PbZrO3 (PZ) thin films have been deposited on Pt(111)∕Ti∕SiO2∕Si substrate and according to the pseudotetragonal symmetry of PZ, the relatively preferred (110)t oriented phase formation has been noticed. The room temperature P-E hysteresis loops have been observed to be slim by nature. The slim hystere…
In a previous paper analytical equations were derived for the packing fraction of crystalline structures consisting of bimodal randomly placed hard spheres [H. J. H. Brouwers, Phys. Rev. E 76, 041304 (2007)]. The bimodal packing fraction was derived for the three crystalline cubic systems: viz., face-centered cubic, b…
The purpose of this study was to determ the degree, level and capacity indices of agricultural mechanization in Sarab Region (N: 37o45', E: 47o30') in Eastern Azarbayjan Province, comprising about 65,164 hectares of farming land. The number of tractors, types of machines, and degree, level, and capacity of mechanizati…
This paper describes the spectral broadening of cholesteric liquid crystal film prepared from a blend comprising a cross-linkable liquid crystal polymer and a non-cross-linkable low-molecular-weight liquid crystal. The spectral broadening arises from the formation of gradient pitch across the film thickness. It is sho…
The structure and the rigidity of a forming biopolymer film were determined using concurrent x-ray diffraction and ultrasonic reflection measurements. Film formation of a xylan solution (de-ionized water, 10g∕l xylan, 4g∕l glycerol) was studied during water evaporation at 24(±2)°C, 37(±5)%RH. X-ray diffraction (XRD) d…
We study the diffusion anisotropy (DA) of point defects in fcc and bcc metals in the presence of an applied biaxial stress. The DA depends sensitively on both the crystalline structure and the crystallographic direction in which the stress is applied. For example, interstitials in fcc metals diffuse faster in the plan…
The solvothermal reaction of copper(i) cyanide with 18-crown-6 (18C-6) in anhydrous acetonitrile and further diffusion with ether leads to a novel copper cyanide complex Cu(CN)(CH3CN)·0.5(18C-6) with a rare layered structure that exhibits complex violet luminescence originating from different layers.
This is a case report of a 63-year-old man post renal transplant who developed eruptive keloids, many of which developed with no history of previous trauma. Reports of spontaneous keloids are rare in the literature, and given his history of renal failure, we have considered a connection with nephrogenic systemic fibro…
Electron paramagnetic resonance (EPR) studies and magnetic measurements were carried out on single crystals of multiferroic DyMnO3 in hexagonal as well as orthorhombic structures. The interesting effect of strontium dilution on the frustrated antiferromagnetism of DyMnO3 is also probed using EPR. The line shapes are f…
The interaction of zinc and faceted MgO(111) thin films prepared on a Mo(110) substrate was investigated in situ by using various surface analysis techniques, including X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, Auger electron spectroscopy, high-resolution electron energy loss spectrosco…
We investigate the exchange bias phenomenon in the layered cobaltite Sr1.5Pr0.5CoO4 by using magnetometry. The exchange bias is strongly dependent on the cooling magnetic field as well as the measuring field. These results suggest that the exchange coupling at the interfaces between the ferromagnetic (FM) regions and…
Abstract The electrical conductivity, thermoelectric power, and dielectric properties of polyaniline doped by boric acid (PANI‐B) have been investigated. The room temperature electrical conductivity of PANI‐B was found to be 1.02 × 10 −4 S cm −1 . The thermoelectric power factor for the polymer was found to be 0.64 µW…