Materials Literature
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In the automotive and aeronautic industries, security is of prime importance and so corrosion prevention is essential. Steel parts were once protected with deposits such as cadmium or zinc - nickel produced using a chromatation treatment but recent environmental directives dictate that these methods are no longer acce…
Frequency (10 Hz–1 MHz) and temperature (22–80 °C) dependent dielectric constant (both real and imaginary) of a ferroelectric liquid crystal ZLI-4851 film (21 μm thickness) showing a second order SmC*-SmA phase transition around 63.2 °C have been reported. The variation of dielectric constant as a function of temperat…
Thermal decomposition of TTIP was compared with oxidation of TiCl 4 in morphology and primary particle size of produced TiO 2 particles in a tubular reactor 2.7 cm in diameter and 54 cm in length under equal rate constants. The reactor temperature was varied from 850 to 1000°C for TiCl 4 oxidation and from 492 to 579°…
The magnetic properties of La 2−2 x Sr 1+2 x Mn 2 O 7 polycrystals ( x =0.3–0.4) are studied over a broad temperature range 80–600 K. Quasi-two-dimensional manganites have a complex magnetic structure that undergoes several transitions from one type of magnetic ordering to another. A specific feature of these manganit…
Abstract Fluoronyböite, ideally NaNa 2 (Al 2 Mg 3 )(Si 7 Al)O 22 F 2 , has been found in the Jianchang eclogite pod, Su-Lu coesite-eclogite province, China. It has been approved as a new mineral by the IMA. Single-crystal structure refinement and electron microprobe analysis were used for characterization: C 2/ m , wi…
The crystallisation of lead strontium titanate solid solution phase in glass ceramics in the [(Pb1 - xSrx)O.TiO2] - [2SiO2.B2O3]-[K2O]system (x = 0, 0·1, 0·2, 0·3, 0·4) has been studied. Perovskite titanate was found to be the major phase in all samples investigated. The actual composition of the crystallites develope…
A heteroepitaxial system of h-BN/monolayer graphene on Ni(111) has been investigated by means of vibrational spectroscopy, accompanied by low energy electron diffraction (LEED) and Auger electron spectroscopy (AES). The system was prepared in an epitaxial manner on a Ni(111) surface by chemical vapor deposition (CVD).…
This paper is concerned with bubble contraction in porous media otherwise filled with viscous fluid. We suppose that an external pressure is applied to the (fixed) boundary of a porous medium, forcing a bubble to contract towards a point. By using the Baiocchi transform, we are able to give a rather complete asymptoti…
Abstract Two polymer molecules of the same length ( n ) and the same number of branch points ( N ) can have different properties, since they may possess distinct architectures. In this paper we present a conditional Monte Carlo algorithm for the virtual synthesis of metallocene‐catalyzed polyethylene (PE) in a continu…
Room temperature powder infrared and Raman measurements for the new melaminium salt, bis(2,4,6-triamino-1,3,5-triazin-1-ium) sulfate dihydrate, 2C 3 H 7 N 6 + ·SO 4 2- ·2H 2 O, in the crystalline state, were carried out. The vibrational spectra in the region of internal vibrations of the ions corroborate recent X-ray…
The mobility of individual triple junctions in aluminum is studied. Triple junctions with 〈111〉, 〈100〉, and 〈110〉 tilt boundaries are studied. The data obtained show that, at low temperatures, the mobility of the system of grain boundaries with a triple junction is controlled by the mobility of the triple junction (th…
This study investigates the objective hand evaluation of top sheet materials used for disposable diapers based on their mechanical and surface properties. Previous experience has shown that a system for men's suiting is also useful for other materials, so we have used this system to assess the hand of top sheet nonwov…
Abstract The individual and combined adsorption behavior of polyamides and two different silanes to multicomponent glass surfaces was probed with a combination of x‐ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and static contact angle measurements. Samples were analyzed with and without solvent…
Abstract Extruded parts of non‐sterilized and β‐irradiated (25 and 50 kGy) plasticized poly(vinyl chloride) (PVC) used for disposable medical devices have been studied to investigate the effect of sterilization on surface chemical composition. The polymer surfaces were analysed using angle‐resolved x‐ray photoelectron…
The electronic absorption spectra of several phthalocyanines substituted at the so-called α-, β- and α and β-positions of the macrocycle have been recorded in solution and as films (α = 1,4,8,11,15,18,22, and 25 positions or 1,8 (or 11),15 (or 18), and 22 (or 25) positions, and β = 2,3,9,10,16,17,23, and 24 positions…
Abstract A new thermoset material based on DGEBA with polyaminosiloxane curing agents is presented. The system shows reaction‐induced compatibilization which prevents coalescence of polysiloxane and DGEBA rich domains, leading to gradient structured morphologies. The influence of curing temperature and/or chemical nat…
Ferroelectrics with a spatial variation in the polarization exhibit behavior and properties that are not routinely observed from homogenous bulk or thin film ferroelectrics. A systematic spatial variation in the polarization in a ferroelectric material can be achieved by variations in the composition of the material,…
Abstract A new series of semi‐crystalline polyamides (PA), which comprise extended aliphatic segments between the amide moieties and which display an interesting amphiphilic character has been synthesized and characterized. The polymers PA‐2.34 , PA‐4.34 , PA‐8.34 , PA‐10.34 , and PA‐12.34 were prepared by melt‐polyco…
Abstract Bei Versuchen zur Darstellung von anionisch derivatisierten Holmium‐Oxotelluraten durch Reaktion von Holmiumtrichlorid (HoCl 3 ) mit Tellurtrioxid (TeO 3 ; molares Verhältnis 1:2, 800°C, 10 d) in evakuierten Kieselglasampullen wurden transparente, grünlich gelbe und derbe Einkristalle des Holmium(III)‐Chlorid…
The influence of golf course operation and construction on benthic algal communities in headwater streams on the Precambrian Shield was investigated using a reference condition approach. Streams were sampled for water chemistry and epilithic benthic algae on operational golf courses, on courses under construction, and…