Materials Literature
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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…
A series of novel perfluorononenyloxy group containing polyarylates were synthesized by a high-temperature solution condensation of 5-(perfluorononenyloxy)-isophthaloyl chloride (II) with various aromatic diols in o-dichlorobenzene. All the polyarylates were amorphous and readily soluble in many organic solvents such…
The mechanical behavior of nonwoven geotextiles in soil-fabric interaction is in vestigated through laboratory experiments and theoretical analysis. A computer model is presented to simulate geotextile performance in pullout tests. The model parameters are based on single fiber properties and the fiber orientation dis…
Abstract Melts of aromatic carboxylic acids are found to be excellent reaction media for 1‐pot high molecular weight polyimide synthesis from diamines and tetracarboxylic acid dianhydrides. No reversible reaction of polyamic acids (PAA) formation was observed. The effect of the reactivity equalization was observed for…
Oxazoline is a very interesting functionality for reactive extrusion and other applications. In this paper, we report the possibility of chemically transforming nitrile group attached to a copolymer of styrene and acrylonitrile (SAN) to oxazoline group using 2-aminoethanol (AE). The chemical modification of SAN with A…