Materials Literature
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Regular fast Fourier transform (FFT) algorithms require uniformly sampled data. In many practical situations, however, the input data is nonuniform, and hence the regular FFT does not apply. To overcome this difficulty the authors have proposed an accurate algorithm for the nonuniform forward FFT (NUFFT) based on a ne…
Mesophase forming chromophores are an important challenge of material science. This article describes the synthesis of new perylene mesogenes 10. The materials were obtained by twofold Diels-Alder reactions of our recently published 1:1 isomeric mixture of 3,9- and 3,10-dialkylperylenes with N-heptadecyltriazoline-3,5…
This paper evaluates the anisotropic stress corrosion cracking behaviour of high-strength prestressing steel wires. To this end, two eutectoid steels in the form of hot rolled bar and cold drawn wire were subjected to stress corrosion cracking tests in aqueous environments using a constant strain technique and precrac…
Colloidal processing is well known to be an effective method to avoid the agglomeration of particles in powder processing. In this method, particles are dispersed by the electrostatic repulsion arising from their surface charge which can be controlled by the pH-value of the suspension. Since fine particles tend to agg…
Raw naturally coloured and white cotton cellulose fibres were investigated by Fourier transform near-infrared (FT-NIR) spectroscopy and chemometric methods, namely principal component analysis (PCA). In general, the white cotton exhibited bands that could be associated with the structural features of the cotton cellul…
The reaction of [NEt4]2[Pt(mnt)2] {mnt = [S2C2(CN)2]2–} with [Pt(CNMe)4][PF6]2 gave the diamagnetic ‘stacked’ salt [Pt(CNMe)4][Pt(mnt)2]. In acetonitrile, nitromethane and nitropropane solution respectively, treatment of [NEt4][Pt(mnt)2] with [Pt(CNMe)4][PF6]2 yielded three different crystal forms of the salt of 1∶2 s…
The effort discussed here addresses the use of shorter incident wavelengths for characterizing sub-0.1 μm linewidths and the corresponding influence on scatterometry measurement sensitivity to linewidth variations. A sensitivity metric, based on the variance statistic, was developed using well-characterized, large-pit…
Dynamic and a static methods for measuring thermal conductivity of textiles have been developed, and the measuring processes and results are described in detail in this paper. Three different textile materials are used for the actual test. and the data are analyzed, illustrated, and compared. Moreover, a theoretical m…
A titanium sonotrode is used to demonstrate that ultrasonic irradiation significantly enhances the rate of electrochemical oxygen reduction and hydrogen evolution reactions in neutral aqueous electrolyte.
The structural pressure dependence of strontium has been studied using angle-dispersive powder diffraction techniques with the image plate detector system. The two-dimensional diffraction data has allowed the clear identification of an accompanying minor phase in the Sr-III stability range which has enabled the struct…
The effects of an epoxidized plasticizer on the mechanical properties and thermo-oxidative ageing behaviour of poly(vinyl chloride)/epoxidized natural rubber thermoplastic elastomers (TPEs) were investigated. Aged and unaged blends were characterized by FTIR, tensile properties, tear strength, hardness and dynamic mec…
Electron attachment to anthracene vapour has been measured between 48 and 300 K using the CRESU technique. Preliminary measurements have found values between 1 and 3×10-9 cm3 s-1 that do not vary greatly with temperature.
A viscoelastic split Hopkinson pressure bar intended for testing soft materials with low acoustic impedance is studied. Using one‐dimensional linear viscoelastic wave propagation theory, the basic equations have been established for the determination of the stress—strain—strain rate relationship for the tested materia…
Dispersion, morphology and electrical conductivity of Ketjenblack (KB) filled High Density Polyethylene (HDPE)/Isotactic Polypropylene (iPP) blends have been studied. The percolation threshold of KB filled HDPE50/iPP50 blends, 0.75 phr KB content, is much lower than those of the individual polymers. The SEM micrograph…
Titanium oxo based xerogels obtained through hydrolysis of titanium tetrabutoxide in acidic conditions have been characterised through FTIR,17O MAS and 1H–17O static CP NMR experiments. This latter technique allows the separation of the 17O NMR resonances corresponding to the protonated titanium oxo sites from those o…
The synthesis and crystal structure of a new 14-membered ring gallium oxyfluorophosphate are described: DIPYR-GaPO: Ga7P6O28F3C10N2H16 , Mr=1343.1, space group P , a=12.000(3) Å, b=13.895(4) Å, c=10.280(4) Å, alpha;=101.09(3)°, beta;=100.91(2)°, gamma;=106.41(2)°, Dc=2.83 g cm–3 , F(000)=1297, R=2.89%, Rw=3.63%. The p…
A unique hexagonal system based on an organic π-donor has been tailored by the strong and directional I···N intermolecular interaction, and its highly symmetrical structure including two types of channels and high conductivity are reported.
The stability of oxygen anions and the hydrogen abstraction from methane on a reduced SnO2 (110) crystal surface have been studied theoretically using a point-charge model. The geometric and electronic structures for the present molecules are calculated by means of a hybrid Hartree–Fock/density functional method at th…
A study of lithium insertion in two tetragonal tungsten bronze (TTB) type phases of general formula M 8 W 9 O 47 (M=Nb and Ta), is presented. The electrochemical insertion of up to 20 lithium atoms per formula unit in Nb 8 W 9 O 47 (Li/ΣM=1.2) proceeds through a reversible reaction with several single phase and one tw…
Abstract A detailed low‐energy electron diffraction (LEED)‐IV analysis, complemented by scanning tunneling microscopy (STM) observations, was carried out for the apparent (2 × 2) structure of the oxygen‐covered Ru(001) surface at a coverage of 0.75 ML. We present STM images of incomplete layers which allow one to defi…