Materials Literature
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Abstract Mithilfe chemischer Transportreaktionen (Transportmittel Iod, 1000 → 900 °C) konnten im System ZnS/ZnTe, das eine breite Mischungslücke aufweist, schwefelreiche und tellurreiche Mischkristalle durch chemischen Transport erhalten werden. Während der Transport der tellurreichen Phasen ZnTe 1‐x S x (x = 0 … ca.…
We present an experimental protocol for the spectroscopic study of the dynamics of glasses in the aging regime induced by sudden pressure jumps (crunches) across the glass transition line. The sample, initially in the liquid state, is suddenly brought in the glassy state, and therefore out of equilibrium, in a four-wi…
A 16-arrayed polymeric optical modulator is fabricated using an electrooptic (EO) polymer with a large EO coefficient and good thermal stability. The 16-arrayed modulator has lumped-type electrodes with a response time of less than 1 ns. The 16-arrayed modulator has good uniform modulation characteristics between the…
Electron transport and ion transport are two critical processes taking place during electrochemical oxidation/reduction of conjugated polymers. Because they accompany and depend on each other, research on the individual processes is difficult. We present a device that allows us to measure ion transport directly and in…
Abstract With time‐resolved small‐angle neutron scattering (TR‐SANS), the crystallization kinetics of polyethylene from deuterated o ‐xylene solutions upon a temperature jump have been investigated. On the basis of a morphological model of coexisting lamellar stacks and coil chains in solution, experimental data have…
The oxidation states of Mn at two different crystallographic sites in the distorted spinel structure of Mn3O4 were determined by the approach of anomalous synchrotron x-ray powder diffraction. The real parts of anomalous scattering factors for the two Mn sites were refined from a series of powder diffraction patterns…
Abstract By employing small‐angle neutron scattering (SANS), we have investigated a miscible mixture of polystyrene (PS) and poly(vinyl methyl ether) (PVME) to answer the question of what a gel state is. The large difference in the glass‐transition temperatures ( T g 's) of PS and PVME uniquely enhances dynamic asymme…
When using polymeric networks to EAP material, certain requirements need to be fulfilled or at least partly fulfilled. The networks need to be strong since the driving voltage goes as the thickness of the film to the second power, but on the other hand the networks need to be soft and flexible in order to provide suff…
The present study focuses on the application of immobilization technology to enzymic sugar syntheses. The paper describes an improved silica-alginate matrix established for entrapment and encapsulation. The replacement of alginate with pectate provided enhanced chemical resistance of the matrix, which allows the use o…
Abstract AgBi 2 S 2 Cl 3 and three members of the Ag 2x Bi 4—2x S 6—4x Br 4x solid solution (x = 0.50 (I) , x = 0.64 (II) , and x = 0.73 (III) ) were synthesized from Bi 2 S 3 , Ag X and BiS X ( X = Cl, Br) at 720 K. X‐ray diffraction on single crystals revealed that the compounds crystallize in the monoclinic space g…
Abstract One‐pot reactions in aqueous solutions of the polynitrile anion dcne − {2,2‐dicyano‐1‐ethoxyethenolate = [(CN) 2 CC(O)OEt)] − ] with the M II ions (M = Mn, Fe, Co, Cu) in the presence of bpym (2,2′‐bipyrimidine) afford the first mixed dcne/bpym compounds [M 2 (bpym)(dcne) 4 (H 2 O) 2 ] ( 1 : M = Mn; 2 : M = C…
The emission current of a single-wall carbon nanotube (SWNT) in field emission is studied by the tunneling theory with the tight-binding approach. The emission current is almost independent of the chiral angle of SWNT in low fields, but increases with increase of chiral angles in very high fields. We found a room-temp…
We investigate the oxidative degradation process occurring in ladder-type poly( p -phenylene) (LPPP) by spectroscopic and quantum-chemical techniques. Annealing experiments carried out for two representatives of the class of LPPP's with different side chains relate the change in emissive behavior of the polymer to the…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLarge-Amplitude Motions of Form III of Isotactic Poly(4-methyl-1-pentene) Crystallites Prior to Crystal−Crystal TransformationToshikazu Miyoshi, Ovidiu Pascui, and D. ReichertView Author Information Research Center of Macromolecular Technology, National Institute of Advanced In…
Recent advances in electroactive polymers including high field induced strain, high elastic energy density (~1 J/cm3), and relatively high energy conversion efficiency, approaching those of natural muscles, create new opportunities for many applications. Harvesting electric energy from mechanical sources such as a sol…
A typical limitation of polypyrrole based conducting polymer actuators is the low achievable active linear strains (2 % recoverable at 10 MPa, 7 % max) that these active materials exhibit when activated in a common propylene carbonate / tetraethylammonium hexafluorophosphate electrolyte. Mammalian skeletal muscle, on…
The surface of La0.9Sr0.1Ga0.8Mg0.2O3−δ (LSGM 9182) has been examined through the use of secondary-ion mass spectrometry before and after surface modification by mechanical polishing. It was found that the cation stoichiometry varied at the surface in both cases. The effect of this change on the performance of the cat…
Thin films of tungsten oxide deposited by hot filament metal oxide deposition (HFMOD) were thermally annealed up to 800 °C and investigated by means of XRD, Raman spectroscopy, and infrared reflection−absorption spectroscopy (IRRAS). As clearly shown by the XRD and Raman spectroscopy data, the deposited films were amo…
Abstract A new iron( II ) spin‐crossover compound containing a phosphane ligand has been synthesized and characterized by magnetic susceptibility, Mössbauer spectroscopy, and heat capacity and photomagnetic experiments. The [Fe(tppb)Br 2 ] complex [tppb = 1,2,4,5‐tetrakis(diphenylphosphanyl)benzene] exhibits a gradual…
The spectroscopic behavior of rhodamine 6G (R6G) dye intercalated in layered hexaniobate K4Nb6O17 was investigated. R6G cations were intercalated into the niobate through displacement of preintercalated alkylammonium ions. Powder X-ray diffraction and elemental analysis indicated that the dye molecules were densely ac…