Materials Literature
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We present here a simple and novel procedure for fabricating silica and silicon oxycarbide uniform capsules with a hollow macroporous core/mesoporous shell structure. This method is based on the infiltration of sub-micrometer-size solid core/mesoporous shell silica particles with polycarbomethylsilane.
Thermoelectric thin film micro-devices with high packing densities of thermoelectric legs are of high demand in micro-systems for self-standing and so called waste energy self-powered sensor systems for wireless data transfer. One technical solution for such micro-devices is offered by the Micropelt technology. The re…
Isothermal compression experiments on multidomain [001] oriented and poled ferroelectric rhombohedral PZN-0.07PT and PMN-0.30PT single crystals revealed elastic instabilities corresponding to zero field ferroelectric-ferroelectric phase transition under mechanical compression. The application of an appropriate dc bias…
Employing Monte Carlo simulations, we show that the topology of the phase diagram of a single flexible homopolymer chain changes in dependence on the range of an attractive square well interaction between the monomers. For a range of attraction larger than a critical value, the equilibrium phase diagram of the single…
Spinel coatings of Cu-Mn-O and Co-Mn-O were obtained on UNS S43000 stainless steel by oxidation of electroplated metal coatings. It was demonstrated that the coatings can effectively provide a conductive path to the metallic substrate. The area-specific resistance of both Cu-Mn and Co-Mn spinels was 0.003 Ω·cm2 after…
In situ hybridization techniques typically employ chromogenic staining by enzymatic amplification to detect domains of gene expression. We demonstrate the previously unreported near infrared (NIR) fluorescence of the dark purple stain formed from the commonly used chromogens, nitro blue tetrazolium (NBT) and 5-bromo-4…
A comprehensive study of the oxide formed on GaAs by exposure to ultraviolet light and ozone (UV-ozone), and the evolution of Au nanoparticles on UV-ozone treated GaAs(100) substrates, has been carried out using x-ray photoelectron spectroscopy. The UV-ozone oxide has been found to consist of oxides of gallium and ars…
AIMS: Paclitaxel is one of the most effective antiproliferative agents and it has been applied in the development of drug-eluting stents. There are difficulties, however, in using paclitaxel in clinical applications owing to its poor solubility and side effects. We have synthesized nanoparticles of biodegradable polym…
The possibility of insulation of long-lived actinides for the entire period of their potential hazard, i.e., over a virtually infinite time, is the crucial problem in safe disposal of high-level radioactive wastes (HLW). The reality of such a possibility is corroborated by the study of natural radioactive minerals tha…
The equilibrium geometry, energetic, and electronic properties of antisites and vacancies in $\mathrm{B}{\mathrm{C}}_{2}\mathrm{N}$ nanotubes are studied by spin density-functional calculations. We investigate these defects in both the zigzag (4,0) and the armchair (3,3) nanotubes. We find that boron and nitrogen, occ…
A versatile and highly efficient zwitterion method to functionalize single-walled carbon nanotubes (SWCNTs) as well as fullerenes has been developed. This approach employs a combination of moderately weak electrophiles and nucleophiles to create reactive zwitterions, which are the key intermediates toward the function…
Future nanoscale electronics built up from an Avogadro number of components need efficient, highly scalable, and robust means of communication in order to be competitive with traditional silicon approaches. In recent years, the networks-on-chip (NoC) paradigm emerged as a promising solution to interconnect challenges…
Crosslinked polyethylene (XLPE) has become the globally preferred insulation for power cables, both for distribution and transmission system applications. This insulation system provides cost efficiency in operation and procurement, as well as lower environmental and maintenance requirements when compared to older imp…
A homologous series of PEG (various chain length)-substituted octasilsesquioxanes prepared by the hydrosilylation of unsaturated PEGs (poly(ethylene glycol)s) with octa(dimethylsiloxy)silsesquioxane (Q 8 M 8 H ) were studied by wide-angle X-ray diffraction WAXD and rheology. The WAXD results indicate that neat POSS is…
The charge-transfer quenching of photoexcited TiO 2 nanoparticles by hexanethiolate monolayer protected gold clusters (MPCs) with core diameters of 1.1−4.9 nm is reported. The quenching efficiency of Au MPCs was compared using Stern−Volmer plots. The quenching constants ( K Q ) taken from slopes of the plots reveal th…
Based on a Marx generator and a coaxial pulse forming line, an experimental investigation of surface flashover characteristics in vacuum is conducted by using nanosecond pulses of 10 ns rise time and 30 ns full width at half maximum (FWHM). Insulator dielectrics chosen for this investigation are Teflon, PMMA and Nylon…
A new program package based on the Microsoft Windows operational systems is proposed for thermal investigations of crystals. The package consists of two programs, one of which provides a means for calculating the thermal expansion tensor for crystals of any symmetry and the second program is intended for drawing three…
This paper presents an experimental analysis of the effect of dose and dose rate parameters during gamma irradiation of high-density polyethylene (HDPE) samples. Considerations concerning the influence of these parameters on HDPE mechanical strength properties as a result of the predominance of oxidative degradation o…
Mg x Zn 1 − x O (0.0⩽x⩽0.12) thin films have been deposited on glass substrates by sol-gel process. The hexagonal wurtzite structure of ZnO is retained in the Mg-substituted films. From the photoresponse measurements, it is observed that both ZnO and substituted films are UV sensitive and with increasing Mg content, t…
CdS nanoparticles have been synthesized by a chemical reaction route using \nethylenediamine as a complexing agent. The nanoparticles were characterized using \ntechniques such as X-ray powder diffraction (XRD), scanning electron microscope \n(SEM), UV–VIS absorption spectroscopy, and photoluminescence spe…