Materials Literature
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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…
Thermomechanical treatments (TMT) are used to modify the microstructure of austenite or martensite by introducing lattice defects and 1 or particles of a second phase. The temperature range extends between T 1 Md (pure ausforming) and T I Mf (pure marforming). In the intermediate range (Mf < T < Md) a more complex beh…
There is a need in the x-ray imaging community for phosphors with short persistence (I /Ib<0.1 to 0.01% in less than 0.5 ms). Persistence limits a detector’s performance by defining the minimum xray exposure discernible for a given time after a previous exposure, by ghosting of previous images, and by limiting the dyn…
Ultrasonic emulsification of oil and water was carried out and the effect of position of the ultrasound source from the interface on emulsion quality was studied using ultrasonic bath and horn. Correlations for the effect of distance of the ultrasound source from the interface on various emulsion properties such as di…
Discussed are: (i) experimental results for the variation of the oxygen content, the electrical conductivity and the iron tracer diffusion in fayalite, Fe2SiO4, (ii) the relationship between point defects, the deviation from stoichiometry, δ, in Fe3−δO4 and the iron tracer diffusion, (iii) the deviation from stoichiom…
Novel liquid crystalline Low Molecular Mass (LMM) materials bearing two chiral lactate groups, as well as compounds of like structure to MHPOBC have been synthesized. All the LMM compounds exhibit the SmC*A (antiferroelectric) and/or SmC*gamma (ferrielectric) phases. The mesogens have been incorporated as pendant grou…