Materials Literature
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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…
Abstract Electrically conductive resins can be made by adding electrically conductive fillers to typically insulating polymers. Resins with an electrical resistivity of approximately 10 0 ohm‐cm or less can be used for electromagnetic and radio frequency interference shielding applications. This research focused on pe…
Using submonolayer Be deposition onto the Si(111) 7 × 7 surface under ultrahigh vacuum conditions, highly ordered honeycomb-like nanostructure arrays have been obtained. Scanning tunneling microscopy analysis of the nanostructure building blocks has revealed that they have composition, size, and properties similar to…
The phenomenon of particle-stimulated nucleation (PSN) during recrystallization of commercial aluminium alloys has been widely investigated both from a ;scientific viewpoint and from the industrial perspective. The technological impact of this phenomenon is the finding that, depending upon the thermomechanical process…
The alloy Fe35Pt35P30, whose composition is close to a ternary eutectic, was rapidly solidified by melt spinning and the ribbon exhibited a high coercivity, exceeding 20kOe after annealing. The alloy was mainly composed of L10 ordered FePt and PtP2 with an average grain size of about 50nm. In the as-cast state, the al…
Nonlocal gradient corrected density functional theory was used to determine the optimal positions of the protons and their relative affinity in the secondary structure of phosphotungstic acid. First, a body centered cubic structure associated with the hexahydrate was incorporated into the model. The desorption energie…
Large diameter single wall carbon nanotubes exist with both round right cylinder and barbell-like flattened cross sections. Using an adaptive intermolecular reactive bond order potential, we examine the characteristics of both configurations by using molecular dynamics simulations. We then continue to examine the dyna…
Abstract A new sodium molybdate, Na 6 Mo 11 O 36 , has been synthesized, and its crystal structure was determined by single crystal X‐ray diffraction (space group P‐1 ; a = 7.2722(6)Å, b = 22.376(1)Å, c = 9.6686(8)Å, α = 89.98(1)°, β = 112.12(1)°, γ = 90.29(1)°; Z = 2). The compound can be considered as a new structur…
We demonstrate theoretically that modification of the acoustic phonon spectrum in semiconductor heterostructures with large acoustic impedance mismatch between the core and cladding layers may lead to strong phonon depletion in the core layer. The latter is achieved if the heterostructure parameters are properly tuned…
Abstract Recent developments in polymer nanocomposites have led to improvements in conventional short‐term, but the long‐term mechanical properties have received little attention. The objective of the present study was to characterize the effect of nanoparticles on the fatigue crack initiation and propagation mechanis…
BACKGROUND: Liposomal encapsulation of doxorubicin has been shown to reduce nonspecific delivery of this agent to normal tissue and to increase specific delivery to malignant cells. On the basis of doxorubicin's demonstrated clinical efficacy against hormone-refractory prostate carcinoma (HRPCA), the authors conducted…
The acoustic phonon transport through an asymmetric y-branch semiconductor quantum structure is investigated by use of the scattering-matrix method. It is found that the quantum structure exhibits mode-splitting behavior, resonant transmission, and the noninteger quantized thermal conductance at very low temperatures.…