Materials Literature
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Phase transformations from α– to ß–SiAlONs (i.e., from α′ to ß′) have been recently reported in a number of rare‐earth SiAlON systems during postsintering heat treatment. In the present work, this transformation process in a Sm (α+ß)‐SiAlON material is studied by using XRD, TEM, and EDS X‐ray mapping techniques. It is…
The binary mixture of cholesteryl nonanoate(CN) and 4,4′-hexyloxy azoxy benzene (HOB) exhibit a very interesting sesophases like blue phase, twisted grain boundary (TGB) phase, induced smectic A, smectic C and smectic B phases at different temperatures when the mixture is cooled from isotropic phase. The existence of…
In a previous study we describe a high flow, Cl2-rich dry etch (DE) process which yields fence-free Pt etch structures. In that work we identify the existence of a transient fence defect, and show that it can cause the formation of an extremely shallow sidewall in the fully etched structure. We now expand upon this ef…
Ferroelectric bismuth layer oxide SrBi2Ta2O9(SBT) thin films were deposited on Pt/Ti/SiO2/Si substrates by rf magnetron sputtering at 500°C and then, were annealed at 850°C for 1 hr in oxygen ambient. The remanent polarization(2Pr) and the coercive field(2Ec) of a 300nm thick SBT film deposited in 10mtorr were 18.5 μC…
Blends of NR with ENR have been prepared in full composition following the polymer blend technique. Basic properties (mastication behavior and thermal degradation of each rubber and Mooney viscosity, Flory-Huggins interaction parameters, and cure characteristics of the blends) of the uncured blends were determined, in…
Abstract Charging currents, J-V characteristics and electron conductivity have been measured in triglycine sulphate along three crystallographic directions: a, b and c. The measurements have been taken in a wide temperature range between −196°C and 80 °C. It is found that the charging currents have short relaxation ti…
Temperature dependent soft mode part of the complex dielectric constant has been measured as a function of bias electric field both in the smectic C* and smectic A* phases for a ferroelectrc liquid crystal (FLC) mixture. From the experimental data, soft mode relaxation frequency and dielectric strength have been deter…
A vibrational study of the local anesthetic procaine hydrochloride in the solid state and in aqueous solution was carried but. Assignment of the amino groups was performed using deuterated and non-deuterated samples. All the bands in the spectra were identified and assigned. The structure of the procaine cation was de…
Abstract Hydrogen-bonded columnar structures have been observed in tetrakis(t-butylammonium) diperoxotetramolybdate(4−) (1) and -tungstate(4−) (2). 1, [(CH3)3CNH3]4[Mo4O12(O2)2], crystallizes in the tetragonal space group with a = 16.312(2), c = 6.352(1) Å, V = 1690.2(5) Å3, Z = 2. 2, [(CH3)3CNH3]4[W4O12(O2)2], crysta…
This paper examines the topology of two-step braided fabrics incorporating rigid rods in the axial direction. Fabricated by pultrusion, the 1-mm diameter rods are composed of unidirectional Kevlar fibers and vinylester resin. A modified two-step braiding set-up designed to incorporate the rods is developed. In compari…
Summary Citrate forms strong complexes with A1 ions and may thus influence the stability and formation of Clay‐A1 hydroxide polymer systems (CAIHO). We studied the adsorption of citrate to CAIHO and the influence of citrate on the stability and formation of CAIHO at different A1:clay and A1:citrate ratios and pH value…
The enhancement of miscibility at the lower critical solution temperature (LCST) of the blends poly(vinyl chloride)/poly(ethylene-co-vinyl acetate) (PVC/EVA), poly(vinyl chloride)/poly(styrene-co-acrylonitrile) (PVC/SAN) and poly(vinyl chloride)/poly(ethylene-co-vinyl acetate)/poly(styrene-co-acrylonitrile) (PVC/EVA/S…
We present a new, extremely sensitive optical method to study the nematic-smectic-A (NA) phase transition in liquid crystals. In this new technique, we monitor nematic director fluctuations as a function of temperature as we approach the NA transition. We show that the NA transition in the liquid crystal 8CB (which ha…
Oxidative low-pressure and atmospheric plasma modification of polystyrene/poly(2,6-dimethyl-1,4-phenylene oxide) miscible polymer blend surfaces has been studied using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The extent and stability of surface oxygenation is found to be critically dep…
The melt rheological properties of titanate coupling-agent-treated particulate silver powder (varying from 0 to 5.6 vol% of Ag) were investigated. The effect of filler concentration on shear stress, shear rate, melt viscosity, and melt elasticity parameters were determined by using a piston-type capillary rheometer. T…
Abstract BaAg 2 S 2 wurde als kristallines Pulver bei der Umsetzung von Barium‐bis[dicyanoargentat(I)] im Schwefelwasserstoffstrom bei 500°C erhalten. Einkristalle entstanden in einer evakuierten Glasampulle, in der das pulverförmige BaAg 2 S 2 mit Kaliumrhodanid als Flußmittel bei 480°C erhitzt wurde. BaAg 2 S 2 kris…
We discuss in this letter the dilute part of the phase diagram of the pseudo-ternary system (brine + glycerol), SDS, hexanol through Freeze Fracture Electron Microscopy (FFEM) and dielectric measurements. The main conclusion is the observation of a large one-phase domain L * instead of an L 4 phase as usually found in…
A homologous series of poly( n -alkylmethylsiloxanes), [SiMe(R)O] n, were prepared by cationic ring-opening polymerization (ROP) of cyclotrisiloxanes containing n -alkyl substituents, such as C 2 H 5, n -C 3 H 7, n -C 4 H 9, n -C 5 H 11, and n -C 6 H 13, on the Si. The resultant polymers were characterized by NMR, GPC…
A possibility of the formation a self-contained cylindrical lattice under crystallization of proteins due to the anisotropic (trapezoidal) shape of their globules is discussed theoretically. The theory of cylindrical crystallization is considered. It is shown that in this case the list of the low-symmetry phases is co…
Abstract The reaction of Te, TeX 4 and BiX 3 [X = Cl, Br] in sealed, evacuated glass ampoules in the temperature range 170° 100°C yields a variety of compounds composed of tellurium polycations and halobismutate anions. Two of these have been identified by crystal structure analyses as Te 4 [Bi 6 Cl 20 ] (triclinic, P…