Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRing-Opening Polymerization of β-Butyrolactone by Thermophilic LipasesWenhua Xie, Jun Li, Depu Chen, and Peng George WangView Author Information Department of Chemistry, University of Miami, Coral Gables, FL 33124 Cite this: Macromolecules 1997, 30, 22, 6997–6998Publication Dat…
The effect of hydrogen on strontium bismuth tantalate (SrBi2Ta2O9; SBT) ferroelectric capacitors is investigated. Using several analytical techniques such as x-ray diffraction, electron diffraction, Auger electron, scanning and transmission electron microscopies, the structural and compositional changes in the ferroel…
The treatment of the long-range dipolar interactions in simulations of mesogens is examined. After a brief reformulation of the standard Ewald summation and reaction-field methods in the general context of electrostatics using Green functions, we report the results of Monte Carlo simulations of liquid crystalline phas…
All articles of this category The Preparation of rather complex molecular assemblies can now be accomplished by using a complete set of tetrathiafulvalene (TTF) based building blocks. The facile deprotection of the 2-cyanoethyl group, a versatile protecting group for 1,3-dithiolium-2-thione-4,5-dithiolaes and TTF-thio…
Supramolecular ruthenium complexes (Ru−PyPs) with 4-pyridyl/phenyl porphyrins (PyPs) have been designed and characterized spectroscopically. Ruthenium−dimethyl sulfoxide (Me 2 SO) complexes and their carbonyl derivatives were used as precursors to synthesize adducts with Ru:PyP ratios of 1:1 and 1:2 (monomers), 2:1 (d…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectron Transfer between Mechanically Linked Porphyrins in a [2]RotaxaneMyriam Linke, Jean-Claude Chambron, Valérie Heitz, and Jean-Pierre SauvageView Author Information Laboratoire de Chimie Organo-Minérale URA 422 au C.N.R.S., Institut Le Bel Université Louis Pasteu…
Abstract The second‐order polarizabilities β(— 2ω; ω, ω) of six nondipolar NLO chromophores—1,3,5‐tris(isopropyl‐amino)‐2,4,6‐trinitrobenzene ( 1 ), 1,3,5‐tris(isopropylamino)‐2,4,6‐tris(trifluoro‐methylsulfonyl)benzene ( 2 ), tris(dimethyl‐imoniomethyl)methide diperchlorate ( 3 ), 2,4,6‐tris[4‐( N,N ‐diethylamino)phe…
In an attempt to provide sustained release of ephedrine hydrochloride, the multilayered tablet concept was utilized having a loading dose of 20 mg and a maintenance dose of 40 mg formulated in insoluble matrix system. Several formulations having ethyl cellulose and Eudragit RS 100 were tried. Eudragit RS 100 alone did…
Parametrization of a force field capable of quantitatively describing the gas, liquid and crystal phases of alcohols, ethers and polyethers is described. Two applications are reported, the first employing atomistic simulations to study PVT (pressure, volume, temperature) and cohesive properties of oligomeric poly(ethy…
The maximum working temperature in CuAlNi shape memory alloys is limited by the precipitation of the stable phases that damages the good thennomechanical behaviour during the martensitic transformation. In this paper, the precipitation kinetics of the stable phases inside the metastable I3 phase have been studied by q…
For many applications, the requirement is for a moderately priced polymer that can be molded easily and exhibits adequate stiffness and toughness over a wide range of temperatures. The basic and simplest solution to this problem is to modify existing polymers that already possess many of the desired properties, but ar…
Mechanical properties of oxidation‐resistant SiC/C compositionally graded graphite materials composed of a CVD SiC coating layer, a SiC/C graded layer, and a graphite substrate were studied by bending, compressive, and hardness tests at room temperature. CVD SiC coated graphite and graphite with a SiC/C graded layer a…
Aerogels offer interesting opportunities for (electro)catalysis due to their high porosity and specific surface area. A new electrocatalytic material consisting of a molecularly homogeneous platinum–aerogel nanocomposite was prepared. The mixed components represent, at the microscopic level, very homogeneous combinati…
Abstract The temperature behaviour of the longitudinal and transverse ultrasound wave velocities and attenuation in the region of the ferroelectric phase transition (T c = 225 K) of the glycine phosphite (Gly-H 3 PO 3 ) crystals is studied. The obtained results are considered within the framework of phenomenological t…
The present study concerns a work on the investigation of the effect of the dehydration temperature on the dissolution process of a boron mineral, ulexite, in sulfuric acid solution. In the experiments, the dehydration temperature and dissolution temperature were chosen as the parameters. First, the dehydration of ule…
The use of synchrotron radiation diffraction (SRD) in con‐junction with conventional laboratory X‐ray diffraction (XRD) for analyzing the phase assemblage of selected alu‐mina‐based ceramics is described. This paper outlines the benefits of synchrotron powder diffraction in resolving mi‐norand impurity phases in vario…
The crystal structure of the deuterated acid form of zeolite Y with adsorbed cyclohexane (∼1 molecule/supercage) has been determined by powder neutron diffraction at 5 K. The structure was refined by the Rietveld least-squares method in the cubic space group Fd 3 m [ a = 24.711(2) Å, R p = 3.13%, R wp = 4.28%]. Deuter…
Abstract In coal‐fired combustion systems solid calcium species may be present as ash components or limestone added to the combustion chamber. In this study heterogeneous reactions involving HCN over seven different limestones were investigated in a laboratory fixed‐bed quartz reactor at 873–1,173 K. Calcined limeston…
Abstract Two orienting techniques for stiffening semicrystalline polymers, rolling and die‐drawing, are compared with respect to the anisotropy they produce in isotactic polypropylene (PP). Billets of PP were either drawn at 145°C through a tapered slotted die in the Leeds large‐scale die‐drawing machine to reduction…
Comfort is a major selling point for clothes, and tactile comfort is essential; a fabric must be pleasant to the touch. Several textile finishing processes improve fabric touch: sanding (or emerizing) (for 30% of clothes) and raising (for polar fleece, a current popular product), for example. There is no current contr…