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。
Abstract The recent developments in the field of polyolefin technologies is reviewed in the light of the positive impact that they will have on several aspects of environmental issues.
Abstract Web-like aggregates of coalesced Si nanocrystals produced by a laser vaporization-controlled condensation technique show luminescence properties that are similar to those of porous Si. The results are consistent with a quantum confinement mechanism as the source of the red photoluminescence (PL) in this syste…
The purpose of this paper was to evaluate the possible use of three types of pharmaceutical grades of phyllosilicates as pharmaceutical excipients. Seven samples (two smectites, three palygorskites, and two sepiolites) were studied. A complete mineralogical and chemical characterization of each material was made and p…
The cobalt phosphate, CsCoPO4, possessing the zeolite ABW framework topology has been synthesised using a solid state route. Rietveld refinement from powder neutron diffraction data has shown the material to be a direct structural analogue of CsZnPO4 polymorph III. The framework is made up of alternating cobaltate and…
We report the synthesis and structure, obtained through Rietveld analysis of powder synchrotron X-ray diffraction data, of zinc oxide clusters encapsulated in zeolite LTA.
Microstructural characterization of gas-pressure-sintered reaction-bonded Si3N4 (GPSed RBSN) and gas pressure-sintered Si3N4 (GPSed Si3N4) ceramics at 2223 K for 12.6 ks has been investigated using by back-scattered SEM, TEM and XRD. No residual Si phase was observed in reaction bonded body nitrided at 1673 K for 72 k…
A new kind of thermotropic liquid crystalline, poly(oxybenzoate-co-trimethylene terephthalate), was prepared from p-hydroxybenzoic acid (B) and poly(trimethylene terephthalate) (PTT or T) by melting polycondensation. The monomer ratio of B to T is 60:40. The dynamic thermogravimetric kinetics of the copolymer B/T (60:…
X-ray photoelectron spectroscopy (XPS) was employed to analyse the surface of commercial Al–Zn–In sacrificial anodes in order to quantify the y the concentrations of indium and iron. Analysis was carried out on the as-cast and cut surfaces prior to corrosion testing, followed by short-term 5 h corrosion tests in a 3.5…
A series of syndiotactic polystyrene (SPS) samples in β-crystalline form were prepared by cooling from the melt at various rates. The effects of cooling rate from the melt, DSC heating rate and annealing on the multiple melting behaviours of β crystals were investigated by differential scanning calorimetry (DSC) and t…
Nylon-6-b-polyimide-b-nylon-6 copolymers were prepared by first synthesizing a series of imide oligomers end-capped with phenyl 4-aminobenzoate. The oligomers were then used to activate the anionic polymerization of molten ϵ-caprolactam. In the block copolymer syntheses, the phenyl ester groups reacted quickly with ca…
The results are given investigations of the structural and physicomechanical properties in porous titanium nickelide, and these results are compared with analogous properties in cast alloys.
Field induced deformation and electrocaloric effect are investigated in the vicinity of phase transition at 163°C. The sharp increase of electrostriction below Tc is explained by the field induced ferroelectric to antiferroelectric phase transition. The antiferroelectric phase appears and remains stable below Tc in th…
The temperature dependencies of optical birefringence for nominally pure crystals Sn2P2S6 and these crystals with the impurities of lead or selenium atoms, and solid solutions of Sn2P2(SexS1−x)6 have been investigated. The changes of the anomalies in the vicinity of the second order ferroelectric phase transition with…
The infrared and Raman spectra of (NH4)2HPO4 and (ND4)2DPO4 were investigated between 10 and 450 K in the 4000–10 cm−1 wavenumber range. For the two compounds, four crystalline phases were evidenced and characterized spectroscopically, and structural and dynamic information was obtained. The crystalline structures and…
Thermal conductivity (κ) of iodine doped n-type PbTe with carrier concentration (n) in the range of 1.5×1024 to 3.4×1025 m−3 was measured by using a laser flash method in the temperature range from 300 to 600 K. The scattering factor (r) was estimated from the temperature dependence of Hall mobility. The r values belo…
We study the Lyapunov exponent for electron and phonon excitations, in pure and random Fibonacci quasicrystal chains, using an exact real-space renormalization-group method, which allows the calculation of the Lyapunov exponent as a function of the energy. It is shown that the Lyapunov exponent on a pure Fibonacci cha…
The molecular characterization of the maltohexaose-producing amylase gene of Klebsiella pneumoniae revealed an open reading frame in which 2,031 base pairs encode a protein of 677 amino acids with a calculated molecular weight of 75,921. The amylase gene had high similarities of 73.6% in DNA sequence and 79.3% in dedu…
Prediction of the cure-induced Tg increases and associated matrix and composite mechanical property deterioration of BMI systems in real service environments is attempted by network structure interrelations with mechanical and thermal properties as a function of composition (initial monomer ratio) and time-temperature…
Effects of a strong magnetic field on recrystallization and coarsening of grains after primary recrystallization were studied in non-oriented 3% silicon steels. The strongest applied magnetic field strength was 10 tesla. It was found that primary recrystallization process is retarded by applying a strong magnetic fiel…
During corrosion of Zr alloys in pressurized water at high temperatures a fraction of the corrosion-hydrogen is picked up by the metal. Long-term out-of-pile corrosion experiments have shown that chemical composition of Zr alloys and the size of second-phase particles (SPP) in Zircaloy-4 (Zry-4) affect the corrosion a…