Materials Literature
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The surface characteristics of thin films of poly(tetrafluoroethylene) (PTFE) melts were investigated by molecular dynamics simulations, employing the recent explicit atomic force field, including partial charges, which was fine-tuned to the experimental PVT data, the chain conformation and the crystal structure ( Mac…
Non-imaging optical critical dimension (OCD) techniques have rapidly become a preferred method for measuring nanoscale features in semiconductors. OCD relies upon the measurement of an optical reflectance signature from a grating target as a function of angle, wavelength and/or polarization. By comparing the signature…
This paper presents findings from public health and environmental assessment work that has been conducted as part of a joint Norwegian-Russian project to decommission radioisotope thermoelectric generators (RTG) in northwest Russia. RTGs utilise heat energy from radioactive isotopes, in this case 90Sr and its daughter…
When an electric field is applied to microspheres which are dispersed in a ferroelectric smectic liquid crystal, particle translation along the smectic layer plane, i.e., in a direction nearly perpendicular to that of the director, can be observed. Under certain electric field conditions the translation is shown to be…
Electronic structure calculations based on density functional theory and Møller Plesset perturbation theory were performed on three isomers of Si 12 and on the endohedral clusters Si 12 containing neutral or charged atomic species. The existence of endohedral clusters depends on the Si 12 cage shape and the nature of…
We introduce and demonstrate a novel tunable optical filter that is insensitive to input polarization. While the most obvious application of this novel filter is in compact spectroscopy, all technologies that are dependent on tunable passband filters can benefit from it. Analogous to Lyot and Solc filters, this filter…
Electrochemical capacitance of MWCNT/polyaniline composite coatings grown in acidic MWCNT suspensions by microwave-assisted hydrothermal digestion, Wu, Mengqiang, Zhang, Liping, Wang, Dongmei, Gao, Jiahui, Zhang, Shuren
Investigation of collagenase inhibitory natural components afforded two quinic acid esters (1 and 2) and quercetin (3) from the leaves of Pluchea indica (Compositae). Of these, compounds 1 and 2 exhibited collagenase inhibitory activity (IC(50)) at a concentration of less than 10 microm, and 1 showed matrix metallopro…
In this paper, we have studied the vibronic transitions between two symmetric double-well potentials by proposing a model Hamiltonian consisting of a harmonic oscillator and a parturition described by a Gaussian function that leads to a double minima potential with a barrier between the two energy minima. Making use o…
Fabrication of nickel nanocrystal flash memories using a polymeric approach is presented. Heat treatment of the poly (styrene-b-methyl methacrylate) block copolymer with a molecular weight of 67 000 g/mol followed by PMMA removal in an organic solvent created a porous PS film with 20-nm-diameter pores and a total pore…
The possibility of electron transfer from a H-terminated diamond (100) surface to an electrochemically reducible wetting adlayer, including species normally found in the atmosphere, has been studied theoretically using first-principles DFT methods. This type of electron-transfer process is one commonly assumed to be a…
Abstract Five diiodo(ethylenedichalcogeno)tetrachalcogenofulvalenes, DIEDSS {2‐(5,6‐dihydro[1,3]diselenolo[4,5‐ b ][1,4]diselenin‐2‐ylidene)‐4,5‐diiodo‐1,3‐dithiole}, DIET‐STF {2‐(4,5‐diiodo‐1,3‐diselenol‐2‐ylidene)‐5,6‐dihydro[1,3]dithiolo[4,5‐ b ][1,4]dithiine}, DIEDS‐STF {2‐(4,5‐diiodo‐1,3‐diselenol‐2‐ylidene)‐5,6‐…
Substituent effects of the meso-aryl (Ar) groups on the 1H and 13C NMR chemical shifts in a series of low-spin highly saddled iron(III) octaethyltetraarylporphyrinates, [Fe(OETArP)L2]+, where axial ligands (L) are imidazole (HIm) and tert-butylisocyanide ((t)BuNC), have been examined to reveal the nature of the intera…
Polyvinyl chloride (PVC)/organoclay nanocomposites were melt compounded in an internal mixer, Haake Rheometer, at 170°C and 50 rpm rotor speed. Effects of organoclay loading (from 2 to 10 phr — parts per hundred of resin) and maleic anhydride (MAH), as a compatibilizer, on the tensile properties, thermal degradation,…
We present results of the study of forming the image in a scanning electron microscope (SEM). The effects of the electron beam energy and of the beam diameter on the signal profile are demonstrated. Methods of SEM calibration including the measurement of the electron beam diameter are presented. The formulas relating…
Compared to the neighboring infrared and microwave regions, the terahertz regime is still in need of fundamental technological advances. This derives, in part, from a paucity of naturally occurring materials with useful electronic or photonic properties at terahertz frequencies. This results in formidable challenges f…
Recently, the ESRF Optics Group installed a new multilayer deposition facility. This upgrade was motivated by increasingly demanding requirements for multilayer based x-ray optics on modern 3rd generation synchrotron beamlines. Improved accuracy, stability, and reproducibility are key issues. The deposition process is…
We present muon spin relaxation and $^{1}H$ NMR results on the magnetically frustrated keplerate molecule ${{\mathrm{Mo}}_{72}{\mathrm{Fe}}_{30}}$, aimed at studying the local spin dynamics as a function of temperature. We find that, in common with other molecular magnets, the relaxation spectrum of this material is c…
We combine first-principles density functional theory, material synthesis and characterization, and photoelectrochemical (PEC) measurements to explore methods to effectively reduce the band gap of ZnO for the application of PEC water splitting. We find that the band gap reduction of ZnO can be achieved by N and Cu inc…
This letter reports the ultrabroadband infrared luminescence from 1000- to 1700-nm wavelength range and demonstrate optical amplification at the second optical communication window in a novel bismuth-doped germanosilicate glass. The full-width at half-maximum of the luminescence is about 300 nm and the optical gain is…