Materials Literature
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Abstract Well‐defined poly(ethylene oxide)s (PEOs) bearing reactive sites regularly distributed along the chain have been synthesized by the polycondensation of PEO containing a central tertiary amino group with dichloromethane, followed by quaternization with suitable reagents to obtain polyzwitterionic or cationic P…
We report findings on the electrokinetic and solubility behaviors of (Ba,Ca)(Ti,Zr)O 3 (BCTZ) powders having three different [Ba + Ca]/[Ti + Zr] ratios: 0.995, 1.000, and 1.005. Electrokinetic and solubility properties of BCTZ powders in aqueous media are phenomenologically similar to BaTiO 3 . Ba and Ca ions, occupyi…
The surface roughness is one of the main parts of hand prediction. Classical method of surface roughness measurements is based on the surface profile measurement. Characteristic of roughness is then variation coefficient of surface profile (surface height variation). The main aim of this work is to estimate the surfac…
A significant proportion of the nanoparticles of chromium prepared by plasma gas condensation are nanocubes. We have found by electron diffraction and high-resolution transmission electron microscopy that each nanocube of chromium is enclosed by an epitaxial passive oxide film. The oxide film has been identified as fc…
Abstract Single crystal growth experiments for NaKSi 2 O 5 and Na 0.67 K 1.33 Si 2 O 5 have been successfully performed by hydrothermal crystallization of two glasses at 500°C and 1 kbar during 24 hours. For a glass with a Na : K ratio of 1 : 1 a previously unknown NaKSi 2 O 5 modification named phase II was obtained.…
The reaction of Cu(ClO 4 ) 2 ·6H 2 O, imidazole (ImH), and ethylenediamine (en) in a 1 : 2 : 1 ratio afforded in high yield dark-blue single-crystals of [(en)Cu II (ImH) 2 ](ClO 4 ) 2 , 1, which can be used after deprotonation as a building block for heterometallic ferrimagnetic chains. The structural and electronic p…
Boron-free E-CR glass fibres offer a number of benefits over traditional E-glass. Freelance writer S. Sundaram reports on Canadian company Fiberex’s products.
We report some preliminary results on the morphology of thin N,N -dimethyl-n-octadecyl-3-aminopropyltrimethoxysilyl chloride (DMOAP) films. When deposited on a glass substrate, DMOAP forms a mono- or multi-layer structure parallel to the substrate. The surface topography of the film is probed by atomic force microscop…
A strong dependence of the thermopower of germanium crystals on the isotopic composition is experimentally found. The theory of phonon drag of electrons in semiconductors with nondegenerate statistics of current carriers is developed, which takes into account the special features of the relaxation of phonon momentum i…
Salicylic Acid is an aromatic acid used in cosmetic formulations as a denaturant, hair-conditioning agent, and skin-conditioning agent--miscellaneous in a wide range of cosmetic products at concentrations ranging from 0.0008% to 3%. The Calcium, Magnesium, and MEA salts are preservatives, and Potassium Salicylate is a…
The spinning of Nigerian kapok fibre and its blend with cotton fibre has been studied. It is observed that the spinning of 100% kapok fibres beyond lap formation stage is not possible, while the spinning of kapok fibre blended with at least 50% cotton fibre is largely successful. The yarn regularity and tenacity decre…
The corrosive behavior of Ti and its alloys in fluoride media is well known. Based on electrochemical studies, this paper describes the effect of fluoride ions on the passive behavior of Ti6Al4V alloy in lactated Ringer's serum. The open circuit potential of the alloy in the serum, which lies in the passive region of…
The quality of sewing threads, as defined by their mechanical and physical properties, is connected with seam quality and seam strength. Seam quality and seam appearance depend mainly on the following sewing thread properties: bending properties, dimensional stability, thread twist and twist direction, fineness, regul…
The velocity of ultrasonic waves, which were launched using the pulse-echo method and propagated in a stator insulation, was measured to assess the insulation condition of the stator bars. A statistical minimum velocity (V/sub min/) and a statistical average velocity (V/sub av/) were computed for a new and three sets…
Abstract The role of low‐melting sulfate glasses (LMSG) as additives on the flame retardant and smoke suppressant properties of semirigid poly(vinyl chloride) (PVC), as well as the mechanism for flame retardancy and smoke suppression, were studied through the Limiting Oxygen Index (LOI) test. Smoke Density Rating (SDR…
Abstract Differential scanning calorimetry (DSC) was used to study interdiffusion in an initially demixed blend, prepared as particle‐matrix system of the intrinsic miscible polymers poly(vinyl chloride) (PVC, particle, 30 wt.‐%) and poly(butyl methacrylate) (PnBMA, matrix, 70 wt.‐%) during isothermal annealing at 110…
Abstract DFT/B3LYP calculations were carried out for a boron‐nitride nanotube (BNNT) of zigzag (N,0) and armchair (N,N), where N = 4,5 and 6, respectively. From a calculated energy band, density of state and bond order, the electroconductivity and bonding character of BNNT were discussed and compared with that of a ca…
In hollow yarn spinning, the yarn is spun with a PVA filament in its core in the yarn-forming zone, which provides enough dynamic strength to the yarn during spinning. Therefore, the dynamic strength of the yarn is not so important a factor in spinning. In order to measure the spinning limit of a hollow yarn, we measu…
The chemical durability, density and structure of the BABAL glasses with batch compositions (100-x)(0.30BaO·0.50B2O3·0.20Al2O3)·xFe 2O3 (1 < x < 10 mol%), were investigated using Mössbauer spectroscopy, electron paramagnetic resonance (EPR), X-ray diffraction, Raman and differential thermal analysis (DTA). The chemica…
Abstract Graft chitosan derivatives (CMCTS‐ g ‐MAAS and CMCTS‐ g ‐AAS) were prepared by the graft copolymerization of methacrylic acid sodium (MAAS) and acrylic acid sodium (AAS) onto the etherification product of chitosan‐carboxymethyl chitosan (CMCTS). Their antioxidant activity was estimated as superoxide anion sca…