Materials Literature
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Photoluminescence and photocatalytic H 2 evolution reactions of layered caesium titanates, Cs 2 Ti n O 2n+1 (n =2,5,6), have been studied to evaluate the photoactivity of these materials. Cs 2 Ti 2 O 5 showed a broad emission around 420 nm upon excitation at 270 nm at 77 K, while both Cs 2 Ti 5 O 11 and Cs 2 Ti 6 O 13…
For pt.I see ibid., vol.20, no.4, pp.384-91 (1997). The purpose of the second part of the DELPHI survey paper is twofold. First, to describe the experimental methods that have been developed to validate the numerical models generated to characterize a certain electronic part in full detail and second, to highlight the…
The preparation of spherical Y2O2S and Y2O2S:Eu particles using a solid–gas reaction of monodispersed precursors with elemental sulfur vapor under an argon atmosphere has been investigated. The precursors, undoped and doped yttrium basic carbonates, are synthesized by aging a stock solution containing the respective c…
Irradiation of lysozyme in frozen states in the absence of oxygen induces specific fragmentation at defined sites along the backbone chain. This paper localizes radio-fragmentation sites by two methods. First, N-terminal sequencing of radiolysis fragments after separation by SDS-polyacrylamide gel electrophoresis and…
Treatment of two equivalents of the sodium β-diketiminate Na(L–L) 1 with a lanthanide metal(III) chloride, LnCl 3 , yielded the mononuclear complex [Ln(L–L) 2 Cl] (Ln = Ce 3, Pr, Nd 5, Sm or Yb); similarly, two equivalents of 1 with TmI 3 gave [Tm(L–L) 2 I] [L–L = N(R)C(Ph)C(H)C(Ph)NR; R = SiMe 3 ]. When 3 was mixed w…
Polyrotaxanes were synthesized as novel biodegradable polymers with supramolecular assembly and their properties evaluated in vitro. The synthesis of biodegradable polyrotaxanes consists of three steps: preparation of an inclusion complex consisting of alpha-cyclodextrins (alpha-CDs) and amino-terminated poly(ethylene…
Molar absorption coefficients of water in glasses of arc magma compositions have been determined for ∼2.8 μm, ∼2.2 μm, and ∼1.9 μm bands. Excellent agreement was found between the water contents calculated from the absorption peak heights and those determined by H2 manometry when the following molar absorption coeffic…
A new laboratory test for evaluating the tracking and erosion performance of HV outdoor polymeric insulating materials is described. The materials evaluated include various formulations of HTV (high temperature vulcanized) silicone rubber and polyolefin polymers. The test is based on combining some features of the AST…
Surface modifications have great potential to control semiconductor properties such as band bending (BB) and electron affinity (EA). It is demonstrated that tailor‐made, surface‐binding molecules—discarboxylic acid derivatives with aromatic substituents in this case—can be used to modify systematically both the EA and…
Glass, nitinol, and pyrolytic carbon surfaces were grafted with poly (ethylene oxide) (PEO) and PEO-containing Pluronic surfactants by gamma irradiation. These substrates were coated with a primer layer of trichlorovinylsilane (TCVS), which allows grafting of organic polymers. The TCVS-coated substrates were adsorbed…
An amphoteric surfactant templating route permits the synthesis of hexagonal mesophases of zirconium compounds by self-assembly of the surfactant and soluble zirconium species in aqueous solution.
A systematic study on the possibility of Young's contact angle determination from Washburn's equation was performed using the so-called thin-layer wicking technique in which the rate of penetration of a liquid into the porous layer of a solid is measured. Commercial (Merck) SiO2 deposited on the glass plate for thin-l…
Time-resolved EPR studies were made on CIDEP mechanisms in the system of excited triplets (T) and doublets (D) using various kinds of porphyrins and nitroxide radicals. The CIDEPs were investigated by observing both signals of T and D and discussed in terms of an electron-spin polarization transfer (ESPT) and a radica…
The SAC (symmetry adapted cluster)/SAC-CI method was used to calculate the ground and excited states of free base phthalocyanine (FBPc). This is the first accurate ab initio study of the excited states of FBPc. The calculated electronic spectrum agrees reasonably well with experimental results with regard to both ener…
Cell‐mediated lithography —which generates polymer particles with anisotropic patches of addressable functionality of exactly the same size and shape as the template microorganism—is described. The Figure shows the first step in the process. Similarities with lithography using self‐assembled monolayers of alkane‐thiol…
Computer aided partial discharge (PD) source identification using different multidimensional discharge patterns is widely regarded as an important tool for insulation diagnosis. In this paper, a neural network (NN) approach to PD pattern classification is presented. The approach is based on applying variants of the co…
1. Absorption and Photoluminescence in Porous Silicon 2. In-Situ Optical Investigations of Porous Silicon Immersed in Liquids 3. Electroluminescence from Porous Silicon in Contact with a Liquid Electrolyte 4. Nonlinear Optical Properties of Porous Silicon 5. Silicon Based Nanostructures 6. Optical Properties of Relate…
Two types of new nonlinear optical polymers have been synthesized by postreaction of an epoxy-based polymer prepared from the diglycidyl ether of bisphenol A and aniline. The new polymers DGEBA-AZO-TCV and DGEBA-AN-TCV were synthesized by azo coupling of the epoxy polymer with 4-(tricyanovinyl)aniline and by reacting…
Examples are given of transition-metal co-ordination complexes that give rise to alternating layers of organic and inorganic moieties in the solid state exhibiting finite zero-field magnetisation at low temperature. The mechanisms of magnetic exchange included are ferromagnetism, ferrimagnetism and canted antiferromag…
For the first time, electrospray ionisation mass spectrometry has been carried out on purely aqueous solutions of anions, specifically dilute (10–3 mol dm–3) isopolytungstates, peroxotungstates and heteropolymolybdates and tungstates. Many new species have been detected that have not previously been reported in water,…