Materials Literature
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Benzene oxidation at two equivalence ratios (φ = 0.19 and 1.02) was studied in a well-mixed reactor with a 50 ms mean residence time at 350 torr and 900–1300K. The temperature for 20% benzene conversion is shifted to approximately 90K higher temperatures for the stoichiometric condition as compared to the lean conditi…
The effects of incorporating chloro groups at all ortho positions of a diphenylethyne linker that bridges the zinc and free base (Fb) components of a porphyrin dimer (ZnFbB(Cl(4))) have been investigated in detail via various static and time-resolved spectroscopic methods. The excited-state energy-transfer rate in ZnF…
Silicon-containing amorphous hydrogenated carbon films deposited by a plasma-enhanced chemical vapor deposition process were studied using both Raman and ellipsometry spectroscopies. Analyses of the experimental data from both these techniques yielded valuable information about the microstructure of the films. The sil…
The microwave properties of ferroelectric thin films are being investigated. Interdigitated capacitors fabricated on ferroelectric thin films of Sr0.5Ba0.5TiO3 have been characterized at room temperature from 50 MHz to 20 GHz. The relative dielectric constant and dielectric loss tangent of the ferroelectric thin film…
The layer-by-layer assembly of polyelectrolytes (poly(allylamine hydrochloride) (PAH) and poly(sodium styrenesulfonate) (PSS)) was carried out using poly(chlorotrifluoroethylene) film that had been chemically modified to contain alcohol functionality (PCTFE−OH) as a substrate for the deposition. This neutral surface s…
Energy and helicity-dependent absolute photoabsorption cross sections at the Fe ${L}_{2,3}$ edge, measured in transmission from a supported ultrathin Fe film, are presented. These cross sections and semiempirical total-electron-yield (TEY) equations are used to show that the effects of saturation/self-absorption in th…
The synthesis of highly soluble chloro(phthalocyaninato)indium(III) complexes RxPcInCl (3a: R1 = tert-butyl, R2 = H, x = 4 and 4a: R1 = R2 = n-pentyl, x = 8), and their reactions with R′MgBr [R′ = p-trifluoromethylphenyl- (b), m-trifluoromethylphenyl- (c), p-fluorophenyl- (d), perfluorophenyl- (e)] leading to the stab…
The feasibility of using Ce-doped silicates as an alternative to the P22 blue phosphor (ZnS:Ag) was investigated for low voltage field emission displays (FEDs). Silicates of various composition were evaluated based on their chromaticity, intrinsic efficiency, and brightness saturation behavior. The influence of silica…
Very high electron mobility is reported for the liquid-crystalline oxadiazole compound hexyloxyphenyl hexyloxybiphenyl oxadiazole (HOBP-OXD). The synthesis, phase-transition behavior, and electron transport properties of this compound are detailed. HOBP-OXD is found to exhibit one nematic and two smectic phases. A jum…
The anion radical salt β′-Et2Me2P[Pd(dmit)2]2 is non-metallic at ambient pressure. An application of pressure induces a metallic behavior and the system exhibits a superconducting transition in the pressure region of 6.9–10.4 kbar with Tc = 4.0−1.8 K (onset). Under higher pressure, however, non-metallic behavior appea…
Electrically tunable microwave resonators and filters based on bulk single crystal SrTiO3 and KTaO3 with superconducting plates are presented and discussed. Filters are designed for operation at frequencies 0.2 – 2.0 GHz. Thin film varactors and phase shifters, designed for cryogenic or room temperature operation and…
A systematic experimental investigation was carried out to understand the effects of nitrogenation on the microstructure and wear durability of thin amorphous-carbon films. The films were fabricated with 0%, 10%, 15%, 20%, 30%, 40%, and 50% N2 in the sputter gas. Microstructure properties were characterized using Ruth…
Uniform multilayer films of polyelectrolytes (charged polymers) that incorporate redox-active polyelectrolytes are demonstrated to be formed by a simple electrostatic layer-by-layer approach. On conducting substrates, the redox sites within these films are addressable by electrochemical methods. This is verified by co…
We improved the thermal stability of 3-isopropylmalate dehydrogenase from Bacillus subtilis by an in vivo evolutionary technique using an extreme thermophile, Thermus thermophilus, as a host cell. The leuB gene encoding B. subtilis 3-isopropylmalate dehydrogenase was integrated into the chromosome of a leuB-deficient…
Abstract The ability of soil minerals to interact with organic solutes exhibiting π‐acceptor properties was studied using batch adsorption experiments. Among the major groups of naturally occurring minerals, only phyllosilicates were capable of forming strong electron donor‐acceptor (EDA) complexes with such solutes,…
Possible crystal structures of acetic acid were generated, considering eight space groups and assuming one molecule in the asymmetric unit. Our grid-search method was compared with a Monte Carlo approach as implemented in the Biosym/MSI Polymorph Predictor. This revealed no sampling deficiencies. A large number of pos…
Thin-film electrochemical sensors are reported that are based on cation-sensitive redox-active molecules such as in the Figure (new TTF-crown derivatives with R = C(O)O(CH2)nSH or CH2SH) immobilized on a metal surface. The synthesis of the molecules and the self-assembly of the monolayers are outlined. The electrochem…
This review summarizes recent developments in the area of heteroatom-based dendrimers, i.e., dendrimers whose connectivity is based on atoms other than carbon. Hyperbranched structures based on heteroatoms are also considered to a limited extent. In addition, the potential that such dendrimers offer to materials scien…
N,N-dimethylacrylamide (DMAA) was graft copolymerized on poly[(trimethylsilyl)propyne] (PTMSP) by single electron reduction of PTMSP with potassium naphthalenide (K-Naph), followed by anion polymerization of DMAA from the carbanion formed in the reduction. A hard and practically non-water-swelling PTMSP-gr-poly(DMAA)…
For the first time it has been demonstrated that polycrystalline Co films (10–300 nm) of hcp single phase can be produced on SiO2 glass substrates by a gas-flow-sputtering technique. The hcp Co films are obtained at substrate temperatures below 620 K and fcc Co films are obtained above 720 K. A mixture of hcp and fcc…