Materials Literature
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Abstract The reaction pathways during the synthesis of CuAsS have been studied with the DTA in the range 25 — 810 °C with a heating rate of 10 K/min. Educts, intermediates, and products were characterized by X‐ray diffraction at room and elevated temperatures. Educts were the corresponding elements and the binary comp…
The conformational chain mobility of semi-crystalline poly(ethylene terephthalate), PET, is studied in the glass transition region by thermally stimulated recovery (TSR). The thermal sampling (TS) experiments are analysed according to a simple VoigtKelvin model. Both the activation energy (Ea ) and the pre-exponential…
Abstract A new approach of preventing evaporation and migration of antioxidants in rubber is presented. The antioxidant N -1,3-dimethylbutyl- N '-phenyl- p -phenylenediamine (6PPD) was microencapsulated in silica (MC6PPD) prior to compounding with the rubber. The microencapsulated antioxidants were characterized by di…
The equilibrium cocrystallization coefficients D M/CoSO4.7H2O of low amounts (10-3- 10-1%w/w) of M2+ ions (M2+ = {Ni2+, Mg2+, Cu2+, Zn2+, Fe2+, Mn2+, Cd2+, Ca2+}) with CoSO(4)7H2O have been determined with the method of long-time stirring of crushed CoSO(4)7H2O crystals in their saturated solution at 20ºC and compared…
The interaction of poly(styrene-co-allyl alcohol) and aliphatic polyester was studied using FT-IR spectroscopy. The hydrogen bonding between two polymers was investigated by monitoring C=O and OH stretching modes with the variation of concentration and temperature. The phase-separated morphology was also observed usin…
Plate impact experiments have been performed on diamond and the igneous diamond-bearing matrix kimberlite. Longitudinal and lateral stresses within kimberlite have been measured in the uniaxial strain regime using embedded manganin stress gauges. The shock Hugoniot of the kimberlite has been characterised, and the ela…
To study chemical behaviors of energetic deuterium implanted into boron coating deposited by boronization in fusion devices, two types of boron coating film deposited on silicon and IG-430U were prepared by Plasma Chemical Vapor Deposition (PCVD) technique. Boron polycrystal was used as the reference sample. The chemi…
Lyocell fibers, a generic subclass of rayon fibers, are produced from cellulose dissolved in N-methylmorpholine oxide (NMMO). The lyocell solutions typically consist of blends of cellulose from similar low and high degree of polymerization (DP) dissolving pulps to achieve desired spinnability and fiber properties. The…
The aim of this paper is to present a rigorous mathematical proof of the dynamical laws for the topological solitons(magnetic vortices) in ferromagnets and anti-ferromagnets. It is achieved through the conservation laws for the topological vorticity and the weak convergence methods.
We have studied effects of the partial substitution of La/sup 3+/ for A/sup 2+/ on the magnetic properties of double perovskites A/sub 2/FeMoO/sub 6/ (A=Ca and Ba). Polycrystalline A/sub 2-x/La/sub x/FeMoO/sub 6/ (0/spl les/x/spl les/0.3) samples have been prepared by the conventional solid-state reaction in a stream…
Two kinds of CVD diamond films were investigated with respect to their thermoluminescent (TL) properties, especially concerning their sensitivity to ionising radiation and to daylight. The films were characterised by means of Raman/photoluminescence/FTIR spectroscopy, XRD, RBS and elastic recoil detection analysis (ER…
Hexagonal polycrystalline boron nitride (BN) films are synthesized on Si substrates by plasma assisted chemical vapor deposition. In the case of the BN films thicker than 20 nm, the turn-on electric field of the electron emission is strongly influenced by the surface roughness rather than the film thickness. On the ot…
Abstract Thermal decomposition of several aliphatic tert -amyl (TA, 1,1-dimethylpropyl) peroxyesters, RC(O)OOTA, has been studied in dilute solution of n -heptane at pressures up to 2500bar and temperatures up to 195°C. The peroxides under investigation were: tert -amyl peroxyacetate (TAPA), tert -amyl peroxy- n -buta…
Abstract H 12 MgO 14 Rb 2 Se 2 , monoclinic, P 12 1 / a 1 (No. 14), a = 9.401(1) Å, b = 12.658(2) Å, c = 6.339(1) Å, β = 105.25(1)°, V = 727.8 Å 3 , Z = 2, R gt (F) = 0.020, wR ref (F 2 ) = 0.040, T = 293 K. CoH 12 O 14 Rb 2 Se2, monoclinic, P 12 1 / a 1 (No. 14), a = 9.363(1) Å, b = 12.618(1) Å, c = 6.3562(7) Å, β =…
This article is a short review of our work on forces in a liquid crystalline medium that has been carried out in recent years. Using an atomic force microscope (AFM), the force between the glass substrate and ≈10 µm glass sphere has been measured. In all experiments, the glass surfaces have been treated for a homeotro…
The effect of stresses, appearing due to a difference between the temperature coefficients of linear expansion of a substrate and ferroelectric film, on the self-polarization is discussed using thin films of lead zirconate-titanate PbZr x Ti 1− x O 3 (PZT) of different compositions as an example. It is assumed that th…
In this study, it was modified a tensile Hopkinson bar with which it can be carried out tests up to a predetermined strain. During dynamic test using a Hopkinson bar, the final strain reached by the specimen was controlled by a stopping elongation system; this system include a snap ring to attenuate the effects of the…
Abstract Aliphatic‐aromatic hyperbranched polyesters of reasonable degrees of branching ( DB 's) but of relatively low molar masses were prepared from 3,5‐bis(bromomethyl)benzoic acid ( 2a ). 2a was synthesized by radical bromination of 3,5‐dimethylbenzoic acid. The polymerization of 2a and that of the potassium salt…
Raman scattering, X-ray photoemission spectroscopy (XPS), Fourier transform photocurrent spectroscopy (FTPS), Rutherford backscattering (RBS) and electron paramagnetic resonance (EPR) method have been used for characterization of diamond layers deposited by microwave plasma enhanced chemical vapor deposition (MWPECVD)…
The polarization-dependent transmission of light through an electrically controllable in-line-type polarizer that is made from polymer-dispersed liquid-crystal spliced optical fibers is discussed experimentally and theoretically. This in-line-type optical splicing method has the advantage of low transmission loss when…