Materials Literature
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The structural changes during the phase change between the amorphous and crystalline phase in ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ have been the subject of intense study due to the importance of ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ in phase change memory devices. In our study, the ene…
We use density functional calculations to study the structure and the energy of formation of the surface oxygen vacancy (V O ) in a free-standing, very-thin film (VTF) of ZnO and substitutionally doped ZnO VTF. We are interested in this system because the walls of very high area oxides used in catalysis contain VTFs.…
Mechanical properties and thermal degradation of natural rubber compounds containing castor oil were studied to evaluate its suitability as plasticizer. Naphthenic oil was used as a reference plasticizer. The cure time was marginally lower in the case of castor oil mixes, probably due to the presence of free fatty aci…
Chemical treatment methods are most often used nowadays for polymer surface modification; however, new technologies are now considered, especially in physical treatment methods, as laser technologies. Infra-red lasers, like CO 2 , appear to be advantageous due to their large beam size, high efficiency, easy operation,…
In prokaryotes, DNA replication is initiated by the binding of DnaA to the oriC region of the chromosome to load the primosome machinery and start a new replication round. Several proteins control these events in Escherichia coli to ensure that replication is precisely timed during the cell cycle. Here, we report the…
The photophysics of a complex between cucurbit[7]uril (CB7) and rhodamine 6G (R6G) was investigated using single-molecule spectroscopy. On the basis of the distribution of fluorescence intensity, two stable conformations of the CB7/R6G complex were identified. Both exhibit enhanced fluorescence relative to R6G alone.…
Medicine is undergoing a transformation toward minimally invasive surgery, and with it comes an increasing need for more precise miniature instruments to accurately execute complex procedures. In catheter-based surgeries, the physician must control the tip of the catheter from a distal point outside the body, which ma…
A method to characterize shock wave lithotripters by examining the potential for cavitation associated with the lithotripter shock wave (LSW) has been developed. The method uses the maximum radius achieved by a bubble subjected to a LSW as a representation of the cavitation potential for that region in the lithotripte…
In this paper, we present experimental results of surface flashover characteristics of epoxy resin and epoxy resin cast with powdered Al2O3(nano/micro-composite dielectric) samples in partial pressure of nitrogen. The flashover studies are conducted separately using DC and 20 kHz AC signals. The voltage, current, and…
A room-temperature solution route to the controlled synthesis of 0-, 1-, 2-, and 3-D assemblies of molecularly linked metal chalcogenide clusters using essentially identical building blocks is reported. The solvating, ligating, and reducing abilities of hydrazine at room temperature have been exploited to simultaneous…
Sunflower oil and sesame oil contain fairly high percentage of tocopherols and tocotrienols. These oils were emulsified by using a combination of non‐ionic surface‐active agents viz. Span‐80 and Tween‐20 surfactants to get cosmetic emulsions. Stability of the emulsions was enhanced by using natural polymer additives.…
Several Zn (II) and Al (III) phthalocyanines bearing eight or sixteen positive charges on substituents of different structure have been prepared. Synthesized polycationic phthalocyanines have been studied in aqueous and alcoholic media by UV-vis spectroscopy and tested for their efficacy in singlet oxygen photosensiti…
The present study shows important evidence revealing an intimate relationship between the size-induced modifications of electronic structure and optical properties of Ag nanoparticles. Optical absorption spectra of Ag nanoparticles consisting of two predominant peaks corresponding to characteristic plasmon absorption…
We have extended nanolithography into deep submicrometer regime to obtain packing of 50, 100, and 200 nm polystyrene nanospheres, which were then successfully employed to produce highly ordered catalyst nanoparticles with narrow size distributions. We have further combined NSL and photolithography to grow highly align…
1,4-dithienyl-2,5-divinylbenzenes are readily available compounds that undergo oxidative photocyclization to afford bent anthradithiophenes (BADTs). The new parent and didodecyl-functionalized derivatives have been structurally characterized, and their absorption and emission spectra are reported.
All-solid-state devices with switchable mirror properties based on magnesium-rich magnesium–nickel alloy thin films have been prepared using magnetron sputtering. The structure of the devices was a Mg–Ni alloy (40 nm)/Pd (4 nm)/Ta 2 O 5 (200 nm)/H x WO 3 (500 nm)/ITO on a glass. The composition of the alloy was Mg 5 N…
Diatom classification is changing. We briefly discuss the history of diatom classification and comment on some of the most recent systems derived from the analysis of molecular data. Classification is not about “sources” of data, but the recognition of monophyletic groups based on evidence. We note that through recent…
Abstract Polypropylene (PP)‐based nanocomposites containing 4 wt% maleic anhydride grafted PP (PP‐ g ‐MA) and 2 wt% Cloisite 20A (C20A) were prepared using various processing devices, viz., twin‐screw extruder (TSE), single‐screw extruder (SSE), and SSE with an extensional flow mixer (EFM). Two processing methods were…
The dielectric relaxation process of water was investigated for polymer/water mixtures containing poly(vinyl methyl ether), poly(ethyleneimine), poly(vinyl alcohol), and poly(vinylpyrrolidone) with a polymer concentration of up to 40 wt % at frequencies between 10 MHz and 10 GHz in subzero temperatures down to -55 deg…
Chitosan-based coatings were used to delay ripening and prolong shelf-life of mango fruit stored at 15±1°C and 85—90% RH for 35 days. Mango fruits were treated with 2% chitosan solution or with 2% chitosan containing 1% tea polyphenols (TP—chitosan). Samples were taken at regular intervals for analysis. Results indica…