Materials Literature
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Pure BaMg2Si2O7 , and its europium and magnesium doped forms, have been synthesized by solid state reaction. BaMg2Si2O7 and BaMn2Si2O7 crystallize in an orthorhombic structure with the space group Ama2. The lattice constants obtained from X-ray powder diffraction are a=13.742(2) Å, b=12.698(2) Å and c=7.237(1) Å for B…
Cerium(III) sulfide (Ce 2 S 3 ) powder was synthesized via the sulfurization of ceria (CeO 2 ) powder using carbon disulfide gas. Single‐phase α‐Ce 2 S 3 could be formed via sulfurization at 973 K for 28.8 ks. The preparation of α‐Ce 2 S 3 became feasible at low temperature, in comparison to sulfurization using hydrog…
The solution sol-gel method is used to produce thin films of photosensitive hybrid organic-inorganic glass on silicon. Glasses consisted of photoinitiator, methacryloxypropyltrimethoxysilane, methacrylic acid, and zirconium oxide. Clear, low optical loss films are obtained, indicating nanophase homogeneity in the samp…
Abstract. Various nanocomposite systems have been synthesized by sol-gel routes. For this reason, prefabricated nanoparticles (SiO2 sols or boehmite powder) have been dispersed after surface modification in sol-gel-derived organically modified or polymeric ligand matrices. In all cases, a significant effect on dispers…
Carefully controlled treatments with proteolytic enzymes were used to reduce the buckling load and collapse energy of wool yarns. These treatments are shown to improve the softness and reduce the subjectively perceived prickle of fabrics knitted from the treated yarns. A new yarn-bundle compression test was used to qu…
An image-analysis method for drape measurement is investigated. The image-analysis method is rapid and precise and allows multiple measurements to be made. The drape-distance ratio is proposed as an alternative measure of drape. The repeatability of drape values is investigated. Drape values are influenced by the numb…
Hydrogen absorption characteristics of pure iron and eutectoid steel fabricated by cold drawing have been evaluated by thermal desorption spectrometry (TDS). The pure iron specimens with ferrite (α) structure and the eutectoid steel specimens with α and Fe3C structures, were produced under various degrees of reduction…
We report on a laboratory study of the atmospheric corrosion of zinc in air containing different concentrations of carbon dioxide (<1, 350, 1000, and 40,000 ppm ). The samples were exposed to synthetic atmospheres with careful control of concentration, sulfur dioxide concentration, relative humidity, and flow conditio…
Fourier Tranform near infrared (FT-NIR) spectra have been measured for several globular proteins which vary widely in the relative amounts of different secondary structures. In order to assist in the interpretation of the NIR spectra in the region between 5000 and 4000 cm −1 , FT-NIR measurements of silk fibroin with…
An aqueous suspension of bacterial cellulose (BC) has such physical properties as higher viscosity, emulsion-stabilizing effect and filler retention than cellulose of other origins. The specific surface areas of BC, microfibrillated cellulose and wood pulp were evaluated by determining the maximum amounts of adsorptio…
Materials for high-performance electrochromic windows must fulfill various requirements, e.g., high optical contrast, fast response time, and stability. The construction and characterization of a device with technologically interesting properties are described. The device uses two active polymer electrode materials wi…
Dielectric, DTA and domain structure investigations (300 K-750 K) have been carried out for ceramics and two types of single crystals of silver niobate AgNbO3. Additional phase of the orthorhombic symmetry has been found in temperature range 630 K-638 K.
Three sugar-integrated gelators bearing a p-nitrophenyl group as a chromophore were synthesised. D-Mannose-based compound 3 was too soluble in most organic solvents to act as a gelator whereas D-galactose-based compound 2 was sparingly soluble in most organic solvents. D-Glucose-based compound 1 was moderately soluble…
BxC1–xcompounds (x≤0.25) have been prepared by the thermal CVD technique. The aim of this paper is to better characterize some specific boron rich compositions that are not yet satisfactorily described. Both structural and physical properties have been investigated; including low temperature direct current resistivity…
The space charge in full size 250 kV HVDC power cables was measured using the pulse-electroacoustic method. Measurements of two types of newly developed DC XLPE cables with 20 mm insulation were taken under a DC voltage of 500 kV with the conductor temperature at room temperature and at 85/spl deg/C. A qualitative ana…
A range of oxo-centred, carboxylate-bridged triiron complexes of general formula [Fe3O(O2CMe)6L3]X (L = py, 3-H2Npy, 4-H2Npy, 3-NCpy, 4-NCpy or 4-CH2CHpy, X = ClO4–) and [Fe3O(O2CR)6(py)3]X (R = But, Ph, CH2Cl, CCl3, CH2CN or 4-NO2C6H4, X = ClO4– or NO3–) has been synthesized, some for the first time. The [Fe3O(O2CPh)…
Fluorescence dynamics of the /sup 3/H/sub 4/ and /sup 3/F/sub 4/ energy levels of Tm/sup 3+/ ions in LiYF/sub 4/ single crystals codoped with Tb/sup 3+/ or Eu/sup 3+/ ions were experimentally investigated and confronted with classical energy-transfer models: direct cross-relaxation-type energy transfers between donor…
The new Rietveld program BGMN is introduced with its unique features especially useful for fully automatic quantitative phase analysis. Some examples including layer silicates are presented.
A method of calculating fatigue life of bearing steels, which accounts for the material fatigue process in relation with its microstructure, is required for optimizing these materials. Such a new approach is presented for bearing steels submitted to rolling contact fatigue, for which inclusions are well known to play…
3 + 3 Condensed optically active hexaaza triphenolic macrocyles 1 and 2 are synthesised and characterised; molecular and close packing structures of macrocycle 2 are discussed.