Materials Literature
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We calculate using mean field theory, the cholesteric pitch in systems composed of chiral molecules, which we model as ‘corkscrews’. We consider both the rigid and semi-flexible limits. Our result for the cholesteric pitch depends on the intrinsic molecular pitch length as well as the concentration of molecules, but d…
A conducting network of crystalline [bis(ethylenodithio)tetrathiafulvalene]2I3 (ET2I3) can be formed within the surface layer of polycarbonate by exposure of films containing 2 wt.% of molecularly dispersed ET to vapours of iodine solution in CH2Cl2, THF or TCE. The relationship between the microstructure and properti…
The electrochemical behavior of A516 grade 70 (UNS K02700) carbon steel with a ferrite-pearlite structure in acidic chloride (Cl–) solutions containing hydrogen sulfide (H2S) at 25°C was investigated by electrochemical impedance spectroscopy (EIS). Results showed the impedance of A516 steel increased in an acidic Cl–…
(Pb, La)(Zr, Ti)O 3 (PLZT) thin films were deposited on 6-inch Pt/Ti/SiO 2 /Si substrates by rf magnetron sputtering using a multichamber production system. The Pb content in PLZT films deposited at low temperature was measured by inductively coupled plasma (ICP) spectroscopy, and the structural properties of crystall…
Abstract The influence of stearic acid, linoleic acid and their methylesters on crystallization of synthetic cis -1,4-polyisoprene was investigated at the isothermal crystallization temperature of −25°C by means of differential scanning calorimetry and dilatometry. The overall crystallization rate of cis -1,4-polyisop…
Silver has high reflectivity in the visible and infrared but cannot be used fully because of its distressing lack of durability. A technique that uses the surface plasmon resonance phenomenon offers a sensitive method for studying the corrosion of silver and assessing improvements. It has been used in the investigatio…
Abstract Poly(vinyl chloride) (PVC) is the leading polymeric material used in medical device and packaging applications in terms of total volume consumed. It offers a uniquely broad range of properties for a wide variety of applications in the medical and health care industry. It fulfills an extensive range of perform…
Gentisate 1,2-dioxygenase (E.C.1.14.13) was purified to homogeneity from Klebsiella pneumoniae M5a1, a soil bacterium able to degrade a great variety of aromatic compounds. The molecular mass of the purified holoenzyme was 159 kDa and its structure was deduced to be a tetramer with 38 kDa per subunit. Gentisate 1,2-di…
An optimized interparticle potential has been developed for its use in computer molecular dynamics simulations of vitreous boron trioxide (v-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$) which includes four-particle interactions. This is required to force the formation of planar six-membered (boroxol) rings in such simulation…
This paper embodies the belated publication of a thesis submitted by JJE to the Free University of Amsterdam in 1955; heretofore the data (heat of sublimation of cyclotetradecane, 21.34+/-0.10 kcal/mol or 89.33+/-0.42 kJ/mol; heat of sublimation of trans-stilbene, 20.68+/-0.08 kcal/mol or 86.57+/-0.33 kJ/mol) were ava…
Polyurethane (PU) surfaces were modified by coupling polyethylene glycol (PEG; molecular weight, 1,000) chains carrying different terminal groups (PU-PEG1K-OH, PU-PEG1K-NH2, PU-PEG1K-SO3) and longer PEG chains (MW, 3,350; PU-PEG3.4K-OH). The modified PU surfaces have the same PEG (1K) chain density. Surface induced pl…
Despite the globalization and internalization of competition and surplus of apparel production, high labour costs and other economic pressures, apparel products are still being produced using traditional methods and machinery, the mechanics of which have not fundamentally changed since the seventeenth century, even no…
A p-type oxide thin film, NiO, and an n-type thin film, ZnO, were fabricated by a liquid phase method using metal acetates as starting reagents. Both the films were transparent, uniform in thickness and porous. By repetition of coating of the n- and p-type films a p–n contact was formed. The contact exhibited nonlinea…
One-dimensionally periodic fivefold quasicrystals have been found in the AlCo-Ni system. They are characterized by a fivefold rotation axis as a unique symmetry element in selected-area electron diffraction (SAED) patterns which is consistent with contrast features in high-resolution transmission electron microscopy (…
Abstract A 50/50 (weight ratio (38/62 mole ratio referred to repeating units)) blend of poly(butylene terephthalate) (PBT) and polyarylate (PAr), was studied by means of thermal, solubility, X‐ray and nuclear magnetic resonance techniques after annealing procedures that enable transesterification. Prolonged thermal tr…
The second harmonic generation (SHG) parameters for metal‐containing ferroelectric liquid crystals are reported for the first time. Some of the materials, based on the structure shown in the Figure, exhibit reasonable NLO efficiencies despite the fact that the molecules themselves do not possess well‐defined donor–acc…
Gadolinium (Gd3+) is known to be the most paramagnetic ion but is also a very toxic cation often used in pharmacology as a putative stretch-activated channel inhibitor. Gadodiamide, a nonionic Gd3+ chelate, is frequently injected i.v. into magnetic resonance imaging (MRI) to enhance contrast. To determine whether this…
Abstract On the basis of measurements of bound rubber and physical properties and the results of Monsanto rheometer, dynamic mechanical and infrared spectroscopic studies, it is observed that strong rubber-filler interaction occurs between XNBR and precipitated silica filler. During molding, XNBR was found to be cross…
We have prepared stable colloidal suspensions in a lyotropic liquid crystal exhibiting an isotropic-nematic-lamellar phase sequence. Small angle neutron scattering (SANS) and dynamic light scattering (DLS) studies show the existence of attractive interparticle interactions in the nematic phase, which lead to a gas-liq…
A solution processible thiophene polymer with a hydrogen-bond-forming urethane group in the side chain, viz., poly[2-(3-thienyl)ethanol n-butoxycarbonylmethylurethane] (PURET), has been synthesized. The polymer is soluble in a wide variety of solvents such as chloroform, dimethylsulfoxide, N-methylpyrrolidone, and tri…