Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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.
We have created photochromic amorphous molecular materials containing an azobenzene chromophore, 4-[di(biphenyl-4-yl)amino]azobenzene and 4,4′-bis[bis(4′-tert-butylbiphenyl-4-yl)amino]azobenzene (t-BuBBAB), which readily form amorphous glasses above room temperature and exhibit photochromism in their amorphous films.…
A brief review is presented of theoretical predictions and experimental observations concerning polar (pyroelectric, ferroelectric and antiferroelectric) achiral mesomorphic phases.
In methanol, the defect nitrosylpolyoxomolybdate [Mo5O13(OMe)4(NO)]3– reacts with Ag+ to give the complex [Ag2{Mo5O13(OMe)4(NO)}2]4– which displays attractive interactions between the two square-planar closed-shell AgI cations.
Optically active ‘adjacent’ type non-centrosymmetrically substituted phthalocyanines (Pcs) and benzo-substituted Pcs having π-systems with C2v symmetry have been synthesized in high yields in a mixed condensation using bisphthalonitriles (which do not racemize under general Pc formation conditions) and a second phthal…
Spectrophotometric pKa determination for p-tert-butylcalix[5]arene (H5L) in acetonitrile (pKa1 = 11.5 ± 0.7, pKa2 = 15.4 ± 1.0 at 298 K) evidenced both intra- and inter-molecular stabilisation of the deprotonated forms. Dimeric complexes [Ln2(H2L)2(dmso)4] (Ln = EuIII, GdIII, or TbIII; dmso = dimethyl sulfoxide) were…
The salts of the tetranuclear vanadium(III) ions [V4O2(O2- CEt)7(L–L)2]z (L–L = bpy, z = +1; L–L = pic–, z = –1) with a V4 butterfly topology and a S = 3 ground state have been found to exhibit out-of-phase ac susceptibility signals, a signature of single-molecule magnets.