Materials Literature
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Chemical reactions have been induced in condensed acetaldehyde by exposure to low-energy electrons as demonstrated by use of high-resolution electron energy loss (HREEL) spectroscopy and thermal desorption spectroscopy (TDS). The HREEL spectra show that the acetaldehyde film is modified significantly when the incident…
The evaluation of uncertainties in doses from intakes of radionuclides is one of the most difficult problems in internal dosimetry. In this paper, the process of assessing internal doses from monitoring measurements is reviewed and the major sources of uncertainty are discussed. Methods developed independently at HPA…
A brief description of the basic spectroscopic properties of Tm3+-doped 20Ge-5Ga-10Sb-65S (GeGaSbS) glass is presented. Spontaneous-emission probabilities, radiative lifetimes, branching ratios, and quantum efficiency of Tm3+ in GeGaSbS glass are evaluated by use of Judd-Ofelt theory. Lifetime measurements are carried…
Zinc oxide (ZnO) single crystals are grown by the modified vertical Bridgman method using a PbF 2 flux. The maximum size of the as-grown ZnO crystal is about ϕ25 mm × 5 mm. The transmittance of the as-grown ZnO crystal is more than 70% in the range of 600–800 nm and the optical band gap is estimated to be 3.21 eV. The…
Single-crystalline CdSe nanostructures with adjustable aspect ratios: starting from a cadmium chalcogenolate single-source precursor, we obtained high-quality CdSe nanostructures with aspect ratios in the range of 2−100. The application of subsequent wetting−crystallization−cooling cycles allowed a stepwise alteration…
Abstract The photoresponse of ferroelectric smectic side‐chain liquid‐crystalline (LC) polymers containing a photoisomerizable azobenzene derivative as a covalently linked photochromic side group is investigated. By static measurements in different photostationary states, the effect of trans–cis isomerization on the m…
The strong blue 476 nm cooperative upconversion luminescence of ytterbium Yb3+-Yb3+ clusters in Yb3+-doped oxyfluoride glass was studied. The strength of this luminescence was found to be about 100 times greater than that of Yb(3): zirconium, barium, lanthanum, aluminum, and sodium fluoride glass. Such a large enhance…
The dielectric constant (ϵ′) and loss factor (ϵ″) measurements have been made in pristine and 75 MeV oxygen-ion irradiated (fluences: 1.8×1011, 1.8×1012 and 1.8×1013 ions/cm2) kapton-H polyimide in the temperature region 20–240 °C at different frequencies ranging from 1 kHz–4 MHz. There is an overall decrease in ϵ′ in…
Abstract Summary: In this work the analysis of the structure orientation, morphology, relaxation time and optical properties of blown films of mLLDPE, LDPE and their blends were performed by using WAXD, SALS, AFM, DSC and rheological and haze tests. For mLLDPE film, the crystals do not present “ a ”‐axis orientation a…
The infrared optical properties and absorption spectra of the melilite solid solution series are reported. Melilite is a high-temperature condensate, and is expected to condense during the early phase of the condensation sequence. In this study, samples of the melilite solid solution series were newly synthesized betw…
Phosphate glasses containing enough sodium to allow the fabrication of optical channel waveguides by ion exchange are photosensitive to intense ultraviolet irradiation from excimer lasers at 193 and 248nm. Permanent submicrometer-period volume index gratings with modulation amplitudes larger than 10−4 were obtained ev…
We report a detailed study of steplike magnetization and resistivity jumps in a bilayered $({\mathrm{La}}_{0.5}{\mathrm{Nd}}_{0.5}{)}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ single crystal. The sample exhibits very sharp metamagnetic transitions at low temperature when the magnetic field is applied…
Abstract Summary: One strategy to solve the problem of unwanted PET oligomer deposits in textile production is their enzymatic cleavage. In this work a selection of different enzymes (esterases, lipases) were tested for this purpose. The capacity to hydrolyse PET oligomers of some of the tested enzymes has been previo…
A molecular model of collagen hydration is used to validate centrifugal dehydration force (CDF) and re-hydration isotherm (RHI) methods to measure and characterize hydration compartments on bovine tendon. The CDF method assesses fluid flow rate from flexor and extensor tendons expressed in (g-water/g-dry mass-minute)…
A combination of single-molecule spectroscopy and analysis with simulations is used to provide detailed information about the structural and dynamic properties of a fluorescent polymer MEH-PPV (poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene]) immersed in a nematic and smectic solvent. In nematic solvents, s…
Specific helix-helix interactions are fundamental in assembling the native state of proteins and in protein-protein interfaces. Coiled coils afford a unique model system for elucidating principles of molecular recognition between alpha helices. The coiled-coil fold is specified by a characteristic seven amino acid rep…
Reaction of Na2WO4 and (CH3)2SnCl2 in water (pH 7) led to the formation of the hybrid organic-inorganic polyanion [{(CH3)2Sn}2(W6O22)]4- (1), which is composed of a novel hexatungstate core stabilized by two dimethyltin groups. Selective crystallization of 1 with guanidinium cations resulted in [C(NH2)3]4[{CH3)2Sn}2(W…
The effect and the role of alkaline earth metals added to Ag/SiO 2 catalyst were studied in the gas-phase catalytic oxidation of benzyl alcohol. The main oxidation product was benzaldehyde, together with only small amounts of CO 2, benzene, and toluene, depending on the reaction conditions. The influence of the method…
The present work deals with the influence of pH and temperature on the spontaneous precipitation of calcium phosphate from simulated milk ultrafiltrate (SMUF) solutions. The pH range investigated is 5.7−7.0, and the temperature varied from 55 to 75 °C. It was found that the precipitates were prisms of hydroxyapatite (…
Gold-palladium nanocrystals with starlike shapes and high aspect ratio nanowires were grown in a surfactant solution. The incorporation of palladium into the growing gold nanostructures induced nanowire formation with high yield. Kinetic control of the metal deposition rate through tuning of the pH value to about 5 wa…