Materials Literature
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Morphology of the liquid crystal/polymer composite has been investigated at the microscopic level as a model investigation in order to elucidate the nature of microscopic phase separation. It has been observed that the modification of surface interaction between liquid crystal and polymer is different for different sy…
Dynamic properties of ferroelectric liquid crystals have been studied by means of observation of electric, optical and mechanical responses to the step-like change of electric field strength. A resonance low-frequency mode interpreted as a texture one has been revealed near the phase transition SmA - SmC*. Interaction…
The synthesis and transition temperatures of a series of novel liquid crystalline quinolines is described. Palladium-catalysed coupling of arylboronic acids to 6-bromoquinolines is used to create 6-alkyl-2-arylquinolines in which the phenyl ring is fluorinated at the 2′ and 2′,3′-position. The fluoro-substituents give…
Polydisperse ethoxylated fatty alcohol (EFA) surfactants can improve the performance of crop protection agents. At the cuticular level they act as accelerators of penetration by increasing the mobility of active ingredients in the cuticle, the barrier properties of which are mainly caused by cuticular waxes. Polydispe…
The new compounds K4Nb2S10O and Rb4Nb2S10O have been synthesized by the reaction of potassium or rubidium alkaline polychalcogenides with NbO2, Nb2O5, or mixtures of Nb and NbO. Their structures consist of discrete [Nb2Q11]4– anions (Q = O, S) built up of two face-sharing pentagonal bipyramids, which are connected via…
Molybdenum carbosilicide composites (SiC‐Mo ≤5 Si 3 C ≤1 ) were fabricated via the melt‐infiltration process. The fracture behavior of the composites was studied from room temperature up to 1800°C in 1 atm (∼10 5 Pa) of argon. The bend strength of the composites slightly increased at ∼1200°C, because of the brittle‐du…
To assist in selection of suitable wetting materials and control of wetting in various situations, previous results for ceramic–aluminium systems have been readdressed. Wetting systems can be categorised into three types (A, B, and C), characterised by original wettability and equilibrium wettability. In pure systems…
Abstract A series of novel aromatic diamines containing kinked cycloalkane structures between two phenyl rings were synthesized by HCl‐catalyzed condensation reaction of excess aniline and corresponding cycloalkanone derivatives. The structures of the diamines were indentified by 1 H NMR, 13 C NMR, FT‐IR spectroscopy…
The optical absorption (OA) and thermoluminescence (TL) or irradiated LiF:Mg,Ti was studied as a function of the temperature of post-irradiation annealing. The dose response of the OA bands and sensitisation effect were also investigated. The filling and emptying rate 'anti-correlation' and the behaviour with dose of…
The method for accurate structure refinement from energy-filtered convergent-beam electron diffraction (CBED) patterns is described with emphasis on recent progress in using imaging filters and 2-D detectors. Details are given about the underlying theoretical model and the statistical analysis of experimental data. Th…
The thermostimulated luminescence (TSL) of powdered synthetic CaSO4 crystals is studied with various types of doping rare earth (RE3+) impurities: Dy3+, Tm3+, Ho3+, Er3+ or Gd3+. Fluorescence and optical diffuse reflectance data are presented. Valence changes of RE3+ are observed after X irradiation and/or thermal ann…
Abstract The development of quantitative X-ray microanalysis in the 1950s spurred the need for knowledge of the many parameters which describe the electron interaction, such as the ionization cross-sections, fluorescent yields, the electron stopping power, mass absorption coefficients, and others. Although classical m…
An important feature of liquid crystal displays is surface alignment of the LCs. While mechanical rubbing has been used extensively to induce such alignment, this process also produces dust and static electricity. However, surface alignment in films of hydroxypropylcellulose has recently been achieved in situ during h…
By treating [(CO)3Re(Hpz)2(pz)] (Hpz = pyrazole) with [Cu(CH3CN)4]BF4, AgNO3, or [Au(tht)Cl] (tht = tetrahydrothiophene) in acetonitrile in the presence of Et3N, the corresponding trinuclear complexes {(CO)3Re(pz)3[M(CH3CN)]2} (1a–c) have been obtained. Treatment of complexes 1a–c with cyclohexyl isocyanide (c-C6H11NC…
A new method is proposed to correct for attenuation effects by adventitious organic contamination in quantitative XPS. The corrected intensity ratio IoX/IoY involving two different substrate peaks is determined as the slope of the plot of IX/IC1s as a function of IY/IC1s for samples covered with organic overlayers of…
Reaction parameters were optimized for the synthesis of high molecular weight ω-phenylalkyl-substituted derivatives of poly(p-xylylene) (PPX) by base-induced 1,6-dehydrohalogenation of corresponding 4-halogenomethyltoluenes. Glass transition temperatures decreased systematically with increasing alkyl spacer of the lat…
A series of amorphous and semicrystalline aromatic poly(thioethers) have been prepared by the reactions of 4,4′-thiobisbenzenethiol and activated dihalides. Azo group activated dihalide monomer was prepared by the reactions of 4-fluoronitrosobenzene with a suitable diamine. The keto and phosphine sulfide containing mo…
Thermal bulk copolymerization of styrene (monomer 1) and maleic anhydride (monomer 2) was carried out in a continuous stirred tank reactor (CSTR) with a double helical ribbon-anchor impeller. A series of experimental runs under different operating conditions (average residence time, reaction temperature, and the compo…
Although nickel(II) oxide (NiO) is a potential carcinogenic agent, it is still used in the synthesis of ceramic pigments because during their preparation at high temperature, NiO is thought to combine with other compounds, crystallizing as new phases with spinel-like structures. Unfortunately, there are no widely acce…
Abstract This paper reports the results of a numerical investigation of the diffusion and reaction of methane in the washcoat of a catalytic monolith reactor. The kinetic rate expression used is an empirical equation determined experimentally for a palladium oxide catalyst. The effect of water inhibition on the reacti…