Materials Literature
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Abstract The dispersions of both reactive and nonreactive polymer‐polymer blend systems achieved in three different mixers are compared. The dispersions are prepared using an industrial scale twin‐screw extruder, a laboratory internal mixer, and a miniature cup and rotor mixer. The morphology development in the three…
The role of hydrogen bonds in the obtention of magnetic molecular materials is investigated in a purely organic openshell molecular solid. The structural and magnetic properties of the 2-(4-hydroxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-yloxyl 3-oxide radical (1) are studied in detail. The intermolecular h…
The three-dimensional structure of a collagen fibrillar network was examined by using a cell-maceration/SEM method combined with measuring the breaking strength of rainbow trout, yellowtail, and tiger puffer muscles. Rainbow trout and yellowtail muscles were tenderized during storage, but tiger puffer muscle showed no…
The paper describes a procedure for the representation of hysteresis in the laminations of power transformers in the simulation of electromagnetic transient phenomena. The model is based on the recognition that in today's iron cores the hysteresis loops are narrow and therefore the modeling details are only important…
A new model has been developed for hydrogen retention and trapping in and release from graphite. Two different regions in the graphite with different hydrogen transport and trapping behaviors are distinguished, the bulk region within, and the surface region on graphite crystallites. The model incorporates new experime…
The complex [(bpy)2Ru(tpphz)]2+(tpphz = tetrapyridophenazine), is obtained by reaction of [(bpy)2Ru(phendione)]2+with 5,6-diamino-1,10-phenanthroline; upon reaction with [(bpy)2Ru(Me2CO)2]2+, the fully conjugated dimer [(bpy)2Ru(tpphz)Ru(bpy)2]4+ is obtained.
Thin films of Ti-rich Ti–Ni were prepared by sputtering. The sputter-deposited films were annealed at three different temperatures of 773, 873 and 973 K for three different times of 1, 10 and 100 h in order to crystallize them. After the heat treatment, the shape memory behavior was examined with a thermomechanical te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Structural Characterization of Two New Phases of Aluminum TrifluorideNorman Herron, David L. Thorn, Richard L. Harlow, Glover A. Jones, John B. Parise, Jaime A. Fernandez-Baca, and Thomas VogtCite this: Chem. Mater. 1995, 7, 1, 75–83Publication Date (Print):J…
Silicone rubber is used for a wide variety of biomedical and industrial applications due to its good mechanical properties, combined with a hydrophobic surface. Frequently, however, it is desirable to alter the surface hydrophobicity of silicone rubber. Often this is done by plasma treatments but the effects are usual…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon Composite Membranes: A Solution to Adverse Humidity EffectsCheryl W. Jones and William J. KorosCite this: Ind. Eng. Chem. Res. 1995, 34, 1, 164–167Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995htt…
Inductively coupled, radiofrequency-induced plasmas of propenoic (‘acrylic’) acid and propanoic acid, operated at a low electrical power (1–10 W), have been investigated using a combination of mass spectrometry (MS) and deposition-rate measurements. Thin films of plasma polymers of both compounds were deposited onto s…
The dissolution of colloidal MnO2 in aqueous solution induced by ultrasound has been investigated in the absence and presence of aliphatic alcohols at a pH of 4.5. It was found that the presence of the alcohols greatly enhanced the amount and rate of the dissolution of MnO2. It is shown that the rate of dissolution ca…
Metal nitrides - boron nitride, aluminium nitride, silicon nitride, transition metal nitrides metal carbides - silicon carbide, transition metal carbides metal phosphides and arsenides - indium phosphide, gallium arsenide metal oxides - sol-gel and polymer routes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Organization of Amphiphilic Porphyrins at the Air-Water InterfaceJohannes M. Kroon, Ernst J. R. Sudhoelter, Albertus P. H. J. Schenning, and Roeland J. M. NolteCite this: Langmuir 1995, 11, 1, 214–220Publication Date (Print):January 1, 1995Publication History Published…
A photo-alignment of nematic liquid crystals (NLC) on a photopolymer film of polyvinyl cinnamate (PVCi) has been achieved by using linearly-polarized UV light. The mechanism of the LC alignment is clarified and good unidirectional LC alignment with pretilt angle is obtained by appropriate combination of normal and obl…
Electron energy-loss spectroscopy measurements have been made on carbon and BN polymorphs, as well as on a number of borides, carbides and nitrides present in sintered cBN based compacts. The similarity in crystal symmetry between carbon and the isotructural BN system results in spectral similarities in both the low-l…
Sequential condensation of a variety of porphyrin-2,3-diones with 1,2,4,5-benzenetetramine and 1,10-phenanthroline-5,6-dione generate conjugated phenanthroline-appended porphyrin systems; this chemistry provides a means by which porphyrin π-systems can be connected to external redox centres.
Langevin-equation simulation is used to study the dynamics of a simple model of homopolymer collapse at infinite dilution for polymers of lengths N=100, 200, 300, 500, and 1024 units. Lennard-Jones potentials are chosen to represent the bead–bead interactions and a harmonic potential bonds nearest-neighbor beads. The…
Thermotropic Liquid Crystals Based on Amphiphilic Carbohydrates The paper gives an advanced report (related to the reviews of Jeffrey) on thermotropic mesogens based on carbohydrate amphiphiles. The different influences being responsible for the formation, stabilization, and for the type of the mesophases, such as the…
A thermally stable vanadium-containing mesoporous molecular sieve, V-HMS is synthesized at room temperature; V-HMS catalysts exhibit excellent catalytic activity in the oxidation of phenol and 2,6-di-tert-butylphenol using either hydrogen peroxide or tert-butyl hydroperoxide as the oxidant.