Materials Literature
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Supramolecular assemblies of radial multialkynylbenzene derivatives are presented which arise either from specific interactions with interfaces or from the covalent linkage of different molecular fragments. Surface-assisted molecular orientation control was investigated at the air/water interface, on photo-oriented az…
Abstract A novel stereo‐regular organo‐bridged ladder‐like polymethylsiloxane ( LPMS ) was synthesized by a stepwise coupling polymerization on the basis of an amido H‐bonding‐assisted self‐assembling template. The monomer N,N′ ‐bis{4‐[3‐(diethoxymethylsilyl)propoxy]‐phenyl}terephthalamide ( M ), prepared by hydrosily…
A theoretical model is proposed for prediction of the interface-pressure profile applied by plain-knitted elastomeric structures used in compression therapy. Compression therapy may be applied through pressure garments to prevent and reduce venous reflux and peripheral oedema. The interface pressure induced by a compr…
Intake of lead is harmful to the human body. Therefore, it is necessary to substitute other alloying elements for lead in Cu alloys. Using a Cu–9.5 mass%Sn alloy powder and CaF2, which has sliding properties equal to lead, a composite sprayed coating (by flame spraying) was developed. The results were as follows. A co…
Poly(ε-caprolactone) layered silicate nanocomposites were synthesized by in situ intercalative ring-opening polymerization (ROP) of ε-caprolactone. The polymerization was promoted by thermal or catalytic initiation starting from either non-modified natural sodium-montmorillonite (MMT-Na) or montmorillonite modified by…
The ferroelectricity of the ABO 3 type perovskite-crystals CaTiO 3, SrTiO 3, BaTiO 3 and PbTiO 3 the local fields acting on the Ti ions are discussed. It is shown that the ferroelectricity in the last two crystals is related to the large electronic polarizability of Ba and Pb.
Thin transparent (for transmission electron microscopy, TEM) self-supported Si(001) films are irradiated on the (110) end face by low-energy ( E =17 keV) He + ions at doses ranging from 5×10 16 to 4.5×10 17 cm −2 at room temperature. The TEM study of the irradiated Si films along the ion range shows that an a-Si layer…
Infusible but soluble polycarbosilane (PCS) was obtained by heating Yajima PCS at 300 °C for 1 h with 1– wt.% of polyborazine (PBN). The simple addition of PBN to PCS and subsequent heat treatment produced multiple effects on thermal conversion. It improved the ceramic yield of the polymers from 64% to 78%, and increa…
Powders in the CeO2-ZrO2-MOx system were prepared by coprecipitation method. Influence of adding a third components MOx of transition metal oxides and rare earth metal oxides on the specific surface area (SA) and oxygen storage capacity (OSC) were investigated. It was found that transition metal oxides decrease drasti…
Polyaniline (PAni) has been classified as an intractable polymer, particularly in its conducting form, the emeraldine salt (ES). Therefore one can consider the mixture of water and PAni as a suspension. The conducting form of PAni can be obtained by a doping process known as acid doping, in which a strong acid turns P…
1.INTRODUCTION 2.IMMERSION CALORIMETRY 3.THERMOPOROMETRY 4.SAMPLE CONTROLLED THERMAL ANALYSIS (SCTA) 5.ISOTHERMAL ADSORPTION MICROCALORIMETRY
ESR study of BaTiO 3 ferroelectrics doped with cerium or with niobium and strontium, both types of samples being doped with manganese, was performed at room temperature. In the samples of the first type the most intensive line with g-factor 1.9612 was shown to originate from paramagnetic center Ti 3+ -Ce 3+ . The smal…
Temperature dependences of longitudinal and transverse dielectric permeability of KDP and DKDP crystals are studied at different values of hydrostatic pressure in order to determine the pressure behaviour of the isotropic point for these crystals. The isotropic point temperature in KDP crystals at atmospheric pressure…
The corrosion inhibition of a green scale inhibitor, polyepoxysuccinic acid (PESA) was studied based on dynamic tests. It is found that when PESA is used alone, it had good corrosion inhibition. So, PESA should be included in the category of corrosion inhibitors. It is not only a kind of green scale inhibitor, but als…
The influence of various rare-earth contents on the friction and wear characteristics of magnesium alloy AZ91D was studied. The results show that the wear resistance properties of rare-earth magnesium alloys are better than those of the matrix alloy under the testing conditions. Magnesium alloys undergo transition fro…
A review is cited with 17 references. The radical mechanism of polyurethane degradation such as hydrolysis, thermolysis, oxidation and photolysis were introduced.
Compact spinning is a novel concept generated through re-engineering of established ring spinning process by attaching a pneumatic zone to existing ring spinning machine. Compact spinning achieves a remarkable improvement in yarn quality and yarn structure through better utilization of fibre properties. The advantageo…
ODA (Optically Dark Area) in the vicinity of inclusions at fracture origin has a crucial importance in the mechanism of ultralong life fatigue failure. From the authors' previous studies, it has been presumed that ODA is formed by the fatigue due to cyclic stress coupled with hydrogen which is trapped by the inclusion…
Glasses of composition M2O•2SiO2 (M = Li, Na, K, Rb and Cs) were obtained by means of molecular dynamics simulation. The structures of these glasses were analyzed with help of Q-species distribution. The influence of alkali oxide on a decay of Q-species is monitored according to the equation 2Q n ↔ Q n-1 + Q n+1 . Equ…
The Effect of Co-Doping by Ca2 + , Ta5 + , Sn4 + , and Ru4 + Ions on the X-Ray Luminescent Properties of Gd2 O 2 S : Tb3 + Phosphors , Morlotti, R., Magro, C., Vedda, A., Martini, M., Croci, S., Nikl, M.