Materials Literature
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Nanoparticle (NP) uptake across the gut is poorly understood. In vitro gut sac preparations and isolated perfused intestines were used to investigate the absorption mechanism(s). Exposure of whole gut sacs to 1 mg/l TiO₂ NPs for 4 h caused total Ti metal concentrations to increase in the intestine, with 80% or more of…
U LTRAHIGH temperature ceramic (UHTC) materials containing hafnium diboride (HfB2) and zirconium diboride (ZrB2) with a silica former, most commonly silicon carbide (SiC), have been studied extensively over the last decade as materials for leading-edge and control surface components on hypersonic vehicles [1–3]. Such…
Ultraviolet (UV) aging is one of the most important problems that electrical insulations are faced with it. Generally, total UV radiation emitted from the sun is divided into three parts. Among all types of ultraviolet radiation, UVChas the highest energy because its wavelength is less than 290 nm. Therefore, UVCis de…
Abstract Polychloroprene rubber (CR) is generally cured in a manner different from that of other diene rubbers. Compounding formulations based on metal oxides have been used satisfactorily for the crosslinking of CR, especially magnesium oxide (MgO) and zinc oxide (ZnO) at loadings of 4 and 5 phr, respectively. In thi…
As an alternative to synthetic pesticides, chitosan has received much attention as a biopolymer active against some agricultural pests. The, insecticidal activity of chitosans of four molecular weights (2.27 Ă 105,3.60 Ă 105,5.97 Ă 105,and9.47 Ă 105 g/mol) was investigated against two species of arthropod pests: o…
Sizable single crystals of iron-based high-transition-temperature superconductors, BaFe 2 (As 1- x P x ) 2 , have been synthesized over an entire x range from 0 to 1. The employment of a Ba 2 As 3 /Ba 2 P 3 self-flux method enables us to grow large single crystals (∼7×7 mm 2 ) using a quartz tube, the P content of whi…
PURPOSE: To examine histological and histomorphometric techniques for measuring collagen in skeletal muscle. METHODS: The following staining methods were used in the study: hematoxylin and eosin, Masson's trichrome, reticulin, and picrosirius red, and immunostaining for collagen types I, II, III, IV, and V. Histomorph…
Carrier multiplication (CM) is the process in which absorption of a single photon produces multiple electron-hole pairs. Here, we evaluate the effect of particle shape on CM efficiency by conducting a comparative study of spherical nanocrystal quantum dots (NQDs) and elongated nanorods (NRs) of PbSe using a time-resol…
The enhancement of fluorescence and Raman scattering by plasmonic nanostructures is studied theoretically with special focus on the effects of the observed molecule's properties and the realistic geometry of the plasmonic nanostructure. Numerical experiments show that the enhancement factor may vary by many orders of…
On integrating one-dimensional (1D) nanocrystals (nanowires) to useful devices, in this review article, we provide a background on vapor-based growth processes and how they impact device integration strategies. Successful integration of nanowires to devices and their scalability simply rely on where and how nanowires…
One of the backbones in nanomedicine is to deliver drugs specifically to unhealthy cells. Drug nanocarriers can cross physiological barriers and access different tissues, which after proper surface biofunctionalization can enhance cell specificity for cancer therapy. Recent developments have highlighted the potential…
In this paper, a fractured 500 kV ac composite insulator, whose fracture characteristics differ significantly from those of brittle fracture, is analyzed in order to identify the aging mechanisms involved and their causes. Several sheath punctures occurred along the insulator which apparently originated from inside th…
The stationary resistive field distribution on the gas-solid interface along epoxy resin insulators is theoretically and experimentally investigated. Due to the phenomenon that the charge carriers necessary for the conduction process originate from natural ionization and a constant generation rate is assumed, the resu…
Abstract Cucurbituril-protected gold (CB–Au) nanowires were prepared by ultraviolet irradiation of an aqueous sodium hydroxide solution of tetrachloroauric(III) acid in the presences of CB. The average width and length of CB[5]–Au nanowires were 256 and 6600 nm, respectively. The nanowires were dispersed in a liquid c…
Dielectric anisotropy and relaxation time of a liquid crystal (LC) system, containing fullerene and methyl red (MR) dye, were studied via impedance spectroscopy technique under a bias voltage. Dye concentration is tried to be 0.1%, 0.5%, and 1% in host nematic liquid crystal coded E7. Dielectric permittivity and diele…
The internal reduction of Ni 2+ ions dissolved in 10 YSZ (10 percent by mole Y 2 O 3 ‐ stabilized ZrO 2 ) was studied using magnetometry. Chemical methods were used to produce specimens with varying amounts of NiO (0.01–11.8% by mol), below and above the solubility limit of NiO in 10 YSZ . The solubility limit was det…
This paper analyzes hysteresis losses of minor loops versus temperature in MnZn ferrite core. The study is carried out through an experimental analysis in the temperature range -32°C to +110°C. The most interesting result is a nonmonotonic behavior of losses versus temperature for minor loops defined between magnetic…
Zirconium tungstate ( ZrW 2 O 8 ) is a unique ceramic material that exhibits isotropic negative thermal expansion behavior, which can be produced at relatively low temperatures using hydrothermal synthesis and subsequent heat treatment. In this work, the effect of reaction conditions on morphology and crystallite size…
The experimental and theoretical studies of the optical properties of pure α-ZnAl2S4 and α-ZnAl2S4:Co2+ crystals were carried out. The ab initio and crystal field calculations of the structural and optical properties of α-ZnAl2S4:Co2+ were compared with the corresponding experimental data. It was shown that the lowest…
In this study, the stress dependence of the Barkhausen noise (BHN) signal is investigated in samples of a spheroidized cementite carbon steel of 0.1-0.5 mass% C, and the mechanism of the dependence on stress is clarified and related to the microstructure of the steel. When the carbon content of the test pieces is high…