Materials Literature
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The water-soluble complex of polyethylene oxide (PEO) with poly (vinyl phenol-co-potassium styrene sulfonate) (PVPh-co-KSS) was studied by liquid-state NMR. PEO showed two peaks in the 1H spectra, which corresponded to the free and complexed PEO. The ratio of the free PEO/complexed PEO was decreased with the increase…
The radical polymerization of 5-methylene-2,2-dimethyl-1,3-dioxolan-4-one (2) was carried out, and the structure of the obtained polymer was studied and determined by NMR, IR, and ultraviolet–visible spectroscopy. It was confirmed that the polymer did not consist of a ring-opened unit but rather consisted of a vinyl p…
Laser-selective excitation and fluorescence and Zeeman infrared-absorption spectroscopy have been employed to study ${\mathrm{Sm}}^{3+}$ centers in doped ${\mathrm{CaF}}_{2}$ and ${\mathrm{SrF}}_{2}$ crystals. The dominant center present in both host crystals has been determined to consist of a ${C}_{4v}$ symmetry ${\…
The reaction of hexacyanobutadiene (HCBD) and meso-tetrakis(4-chlorophenyl)porphinatomanganese(II) pyridine [MnIITClPPpy] (1Cl) leads to two phases of [MnIIITClPPpy][HCBD].PhMe (alpha-2Clpy, beta-2Clpy). Similarly, the reaction of HCBD and tetrakis(4-bromophenyl)porphinatomanganese(II) pyridine [MnIITBrPPpy] (1Br) lea…
Tri-O-allylcellulose (degree of polymerization, DP ∼112) was prepared in ∼91% yield, and tri-O-crotylcellulose (DP ∼138) was prepared in ∼56% yield from microcrystalline cellulose (DP ∼172, and polydispersity index, PDI ∼1.95) using modified literature methods. Number-average molecular weight (Mn = 31,600), weight-ave…
In the present study, we show that the stoichiometry of sputtered molybdenum oxide films can be changed from oxygen deficient to, more surprisingly, oxygen rich. O/Mo ratios as high as 3.2 were measured, depending on the oxygen partial pressure in the sputtering atmosphere. It is shown that a substantial part of the e…
Eine bemerkenswert intensive Bande im Nah-IR-Spektrum weist 1 aufgrund seiner chinoiden Struktur auf (λmax=1080 nm); das kürzere Dimer 2 (λmax=780 nm) ist weniger stark konjugiert, da sterische Wechselwirkungen eine verdrehte Struktur erzwingen. Das aus 62 Atomen bestehende Chromophor von 1 ist im Kristall deutlich ge…
Diamond-like carbon (DLC) films have been prepared by pulsed laser deposition (PLD) (wavelength 248 nm), ablating highly oriented pyrolytic graphite (HOPG) at room temperature in a vacuum of 10 −2 Pa, at fluences between 0.5 and 35 J cm −2 . Films have been deposited on Si(100) with and without a ceramic interlayer, n…
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…