Materials Literature
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The structural details of high-speed melt-spun nylon 6 fibers at spinning speeds ranging from 4500 to 6100 m/min were investigated by solid-state proton nuclear magnetic resonance (1H NMR) spectroscopy, density and birefringence measurements, differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The an…
To investigate the effect of reactive compatibilization in the immiscible poly(ethylene terephthalate) (PET)/polystyrene (PS) blend, poly(styrene-co-methacryloyl carbamate) (PSM) was synthesized as a reactive compatibilizer. The interfacial reaction of the carbamate group in PSM with OH/COOH in PET was confirmed by at…
Polarization modulation infrared linear dichroism has been used to study the molecular orientation and relaxation of polystyrene/poly(2,6-dimethyl 1,4-phenylene oxide) (PS/PPO) miscible blends, containing up to 20% PPO, during and after a rapid uniaxial deformation above Tg. In general, it is found that both the PS an…
We have measured the Hall effect of polycrystalline ${\mathrm{Gd}}_{5}({\mathrm{Si}}_{1.8}{\mathrm{Ge}}_{2.2})$ in the temperature range 4--360 K and in magnetic fields of up to 12 T. The Hall resistivity follows the magnetization of the material in the range studied. The anomalous Hall coefficient increases with incr…
We present a joint theoretical and experimental investigation of the electronic and optical properties of vanadium pentoxide. Electron energy-loss spectroscopy in transmission was employed to measure the momentum-dependent loss function. This in turn was used to derive the optical conductivity, which is compared to th…
Äußerst stabil sind die selenverbrückten Goldkomplexe [Au10Se4(dppm)4]Br2 und [Au18Se8(dppe)6]Cl2, die durch Umsetzung von Gold-Phosphan-Komplexen [(AuX)2(Ph2P(CH2)nPPh2)] (X=Halogen; n=1, 2) mit silylierten Selenverbindungen erhalten wurden. Mittels Elektrospray-Ionisation gelang es, das Kation [Au18Se8(dppe)6]2+ (St…
Tin–oxide (SnO2) thin films were prepared by a modified spray technique called electrostatic spray pyrolysis. Their electrical and optical properties dependence on fluorine concentration, substrate temperature Ts, and the substrate–nozzle distance Dsn was studied. Dsn and Ts seem to be interrelated for the optimizatio…
Microsegregation and a flat, radial conformation of the polar core region are responsible for the columnar mesophases formed by the non-anisometric sixfold alkoxy-substituted 2,4,6-triarylamino-1,3,5-triazines (1). Charge-transfer interactions with flat acceptor molecules such as 2,4,7-trinitrofluoren-9-one impose a l…
The Tb(Fe0.55Co0.45)1.5 films were fabricated by rf magnetron sputtering from a composite target. Samples were investigated by means of x-ray diffraction, vibrating sample magnetometer, conversion electron Mössbauer spectra, and magnetostriction measurements. The as-deposited film is an amorphous alloy with a perpendi…
Scanning tunneling microscopy (STM) images of carbon nanotubes grown by the catalytic cracking of hydrocarbons, which exhibit a well-defined axial periodicity in the 1 nm range, are reported. The data are interpreted as tightly wound, single-wall, coiled carbon nanotubes with an interspire distance of 0.34 nm as the d…
This article reports a study on the dielectric relaxation processes of Cd2Nb2O7 compound. Three dielectric relaxation modes I, II, and III were reexamined. By using the Cole–Cole equation fitting of the frequency dependence of dielectric constant and loss, we obtained more precise relaxation time data, compared to the…
The interaction between polyacrylic acid and two water-soluble cellulose ethers (methylcellulose and hydroxyethylcellulose) was studied. Viscometry, velocity sedimentation, small-angle neutron scattering, and potentiometric titration methods show the formation of stable water-soluble interpolymer complexes due to hydr…
Magnetic characterization has been performed on the cubic phases λ-Li0.07Mn2O4, Li0.98Mn2O4, and the tetragonal phase Li1.82Mn2O4, prepared by electrochemical cycling of a single starting LiMn2O4 spinel. The magnitude of the negative Weiss constant increases with x in LixMn2O4, indicating that antiferromagnetic intera…
The dynamical-mean-field theory combined with the noncrossing approximation is used to set up a scheme to study the electronic structure of strongly correlated electron systems. The noninteracting band structure is obtained from a density-functional calculation within the local-density approximation. With this method…
The dynamic mechanical properties of an organic hybrid consisting of chlorinated polyethylene (CPE) and N,N-dicyclohexyl-2-benzothiazolyl sulfenamide (DZ) were investigated. All the CPE/DZ hybrids showed a single loss tangent (tan δ) peak in the mechanical spectra. The peak area under the tan δ/temperature curves arou…
Immer größere expandierte Porphyrinoide (ein Beispiel ist gezeigt) werden durch neue Synthesemethoden zugänglich. Diese nichtaromatischen Verbindungen enthalten bis zu 16 konjugierte Pyrrolringe, zeigen eine neuartige Metallkoordination, sind chiral und können Anionen binden.
We have studied the quasibinary ferromagnetic semiconductor (Ga0.98Mn0.02)As by magnetic circular dichroism in x-ray absorption. We find a richly structured Mn absorption spectrum typical for localized 3d electrons. An analysis of the magnetization-averaged and dichroism line shapes shows a local Mn moment of 4.6μB, w…
We report computer simulation results of free energies of proton-disordered hexagonal ice and liquid water at atmospheric pressure with the 4-site transferable intermolecular potential model of water. A new reference system is used to calculate the free energy of the ice phase. The melting point of proton-disordered h…
Low-coverage adsorption isotherms for ${\mathrm{CH}}_{4}$ on single-walled carbon nanotube bundles have been measured at eight temperatures between 155 and 195 K. The nanotubes used in this study were untreated, so that the tubes have closed ends. The isosteric heat of adsorption was determined from the isotherms and,…
NdSc 3 ( BO 3 ) 4 (NdSB) can be grown as a nonlinear optical crystal having hexagonal (huntite) structure. The crystal has important spectroscopic properties suitable for various applications in photonics. The observed crystal-field splitting of the energy levels of Nd3+(4f3) has been identified based on analyses of t…