Materials Literature
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Preliminary results are reported on the first ferroelectric 'lyo-mesophases' of banana-shaped molecules. We studied the effect of the non-polar solvents p-xylene and m-xylene on the macroscopic properties of banana-shaped molecules having a B7 phase. It was observed that by adding only 15% of solvent the isotropic-B7…
Preparation, crystal structure and magnetic properties of a 3,5-dimethylpyrazolate bridged binuclear copper(II) complex [Cu 2 (L 1 )(3,5 prz)] (L 1 = 1,3-Bis(2-hydroxy-1-napthylideneamino) propan-2-ol) (1) are reported. Variable-temperature magnetic susceptibility measurements for a powdered sample of the complex were…
PLZT compositions near the morphotropic boundary phase (Zr/Ti = 53/47) were studied changing the lanthanum fraction from 0.5 to 14 at%. The grain size and the porosity due to the lanthanum addition showed an important influence on the dielectric properties of the samples. Dielectric and pyroelectric studies show that…
Behaviors of inclusion particles on the stainless‐steel melt surface were observed in real time by confocal laser microscopy, and theory of capillary interaction was introduced to explain the attractive behavior between some inclusion particles. Solid and semiliquid particles could attract and agglomerate by capillary…
We show that order parameter fluctuations in a good type-I superconductor or a liquid crystal always increase the size of the first-order transition. This behavior is eventually changed when the system crosses over to an inverted- XY critical behavior, with the size of the first-order transition vanishing as a power l…
A method for estimating nanoparticle size by determining the distribution function p(H n ) of hyperfine magnetic fields from data on the Mössbauer spectrum of 57Fe nuclei is described. The idea of the method stems from the fact that, owing to the breaking of exchange bonds for surface atoms, their contribution to the…
Cryo-ground tire rubber was treated with the sulfur oxidizing bacterium Thiobacillus ferrooxidans in order to devulcanize the surface of the ground particles. The devulcanized rubber (15% (w/w)) was mixed with carbon black filled natural rubber, and subsequently vulcanized. The physical properties of the resulting mat…
Abstract Colloidally stable latex blends of natural rubber (NR) and poly(methyl methacrylate) (PMMA) latexes containing up to 50 wt.% PMMA can be prepared by mixing commercial NR ammoniated latex concentrate and monodisperse PMMA latex dispersion. The clarity and tackiness of the films obtained depend on the PMMA cont…
Sintering studies were conducted using kaolin, metakaolin, zeolite 4A, and various synthetic mixtures of Al 2 O 3 and SiO 2 in the presence of Li 2 CO 3 and LiCl as fluxing agents. Various compositions of the above were prepared, and conventional sintering studies were conducted at temperatures of 900°–1450°C with soa…
Das Standard-Wärmedämmschichtmaterial Ytttriumoxid-stabilisiertes Zirkonoxid (YSZ) ist für den Langzeiteinsatz auf eine maximale Temperatur von etwa 1200°C beschränkt. Dementsprechend kann ein weiterer Anstieg der Gaseinlaßtemperatur und damit der Effizienz von Gasturbinen kaum mit YSZ-Beschichtungen erreicht werden.…
Low optical bandgap conjugated polymers may improve the efficiency of organic photovoltaic devices by increasing the absorption in the visible and near infrared region of the solar spectrum. Here we demonstrate that condensation polymerization of 2,5-bis(5-trimethylstannyl-2-thienyl)-N-dodecylpyrrole and 4,7-dibromo-2…
Electrical conductivity measurements in the range 50–300 K have been carried out on gold–fluorocarbon–polymer composite films. Such measurements have been performed on samples with different percentages in volume of gold, before and after thermal annealing up to 450 K. The experimental temperature dependence of conduc…
The pretilt angle and the anchoring strength are important parameters in liquid crystal displays (LCDs). However, in the case of amorphous LCDs (a-LCDs), it is difficult to evaluate these parameters by means of conventional measurement method due to non-uniformity of the LC directors. In this paper, we report the simu…
Abstract A new negative working photosensitive polyimide, based on hyperbranched poly(ether imide) (1), 4,4′-methylenebis[2,6-bis(hydroxymethyl)]phenol (2) as a cross-linker, and a photoacid generator diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (3) has been developed. 1 was prepared by polycondensation of N-…
The thermal behaviour of two series of liquid crystalline carbosilane dendrimers of generations 1–5 containing 8, 16, 32, 64 and 128 terminal phenyl benzoate mesogenic groups, respectively, was investigated by means of polarising optical microscopy, DSC and X-ray methods. Mesogenic groups on the base of methoxybenzoic…
Crack-tip opening displacement (CTOD) fracture toughness measurements have been performed on longitudinal, through-wall thickness, three-point bend samples from an X-80 pipeline steel. Samples were subjected to cathodic protection in an NS-4 test solution prior to and during fracture toughness determination. Variation…
The mechanical properties of Si 3 N 4 materials depend mainly on the microstructure, which originates during the densification process. The microscopic evidence indicates that β‐Si 3 N 4 seeds incorporated in the starting powders play an important role in microstructural development, especially in the heterogeneous gr…
Abstract Clay mineral diagenesis in the Niigata basin is documented by mineralogical and chemical analysis of clay minerals from cuttings from the Shinkumoide SK-1D (SSK-1D) well which is characterized by alternating beds containing dioctahedral and trioctahedral smectite minerals with increasing depth. Dioctahedral s…
Abstract Spontaneous appearance of polypyrrole microtubes was first observed during the electrochemical polymerization of pyrrole in water using sodium p-toluenesulfonate as a supporting salt. Almost amorphous microtube showed high electrical conductivity (σ = 498 S cm−1) along an axis of the tube. The tube also revea…
The synthesis and transition temperatures of a series of novel thienyl-pyrimidine liquid crystalline materials is described. Palladium catalysed coupling of 5-n-alkyl-2-tri-n-butylstannyl thiophenes to 5-bromo-2-iodopyrimidine is used to create novel pyrimidine compounds which exhibit lower melting points than similar…