Materials Literature
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Based on the vibrating sample magnetometer, a method is proposed to comprehensively analyze the in-plane uniaxial anisotropy of magnetic thin film. It can be used to determine accurately the values of effective anisotropy magnetic field Ha, anisotropy constants K1 and K2, as well as the directions of easy and hard axe…
We have studied the magnetic anisotropy of Ga1−xMnxAs thin films grown by low-temperature molecular beam epitaxy on GaAs (311)A substrates by means of ferromagnetic resonance spectroscopy. The angular dependence of the ferromagnetic resonance fields observed can be explained by two main contributions to the magnetic a…
Positive optical gain under pulsed excitation in oxidized porous silicon planar waveguides impregnated with Nile blue (LC 6900) is reported. Amplified spontaneous emission measurements show a dramatic line narrowing when the pump energy is increased, together with a strong superlinear behavior. Variable stripe length…
Thin films of (0.5%, 1%) Nb:SrTiO3 dilutely doped with (2at.%) magnetic transition elements (Cr, Co, Fe, Mn) are examined for ferromagnetism. X-ray diffraction, Rutherford backscattering ion channeling, scanning transmission electron microscopy Z-contrast imaging, and electron energy loss spectroscopy techniques estab…
Abstract Summary: A new series of thermoplastic poly(urethane‐imide)s (TPUI1‐4) containing hydroxyl groups in the backbone was synthesized from the reaction of epoxy‐terminated polyurethane prepolymers (EPU1‐4) and an imide containing diacid (DIDA) chain extender under optimized reaction conditions. EPU1‐4 was prepare…
Fe ions of dose 5×1016cm−2 were implanted at 200keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction ω-rocking curves and φ scans, whereas x-ray absorption spectroscopy identified the presence of both Fe2+ and Fe3+ ions, as well as changes in their r…
Abstract Semifluorinated azobenzene liquid‐crystalline side‐chain polymers with different perfluoroalkyl lengths are used to develop surface relief gratings (SRGs). With sufficient fluorinated side‐chain lengths, surface relief gratings could be completely suppressed due to the self‐assembled liquid‐crystalline order…
Abstract Summary: The structure and rheological properties of a large number of layered silicate poly(propylene) nanocomposites were studied with widely varying compositions. Morphology characterization at different length scales was achieved by SEM, TEM, and XRD. Rheological measurements supplied additional informati…
Amorphous GeOx alloys were prepared by evaporation of GeO2 powder on substrates maintained at 100°C. The evolution of the structure was investigated by infrared-absorption spectrometry, Raman spectrometry and transmission electron microscopy experiments for annealing temperatures less than 600°C. These experiments all…
Abstract Summary: The compatibilization of polyethylene/polyaniline (PE/PANI) blends and the preparation of plasticized PANI/camphorsulfonic acid (CSA) complexes suitable for melt blending were studied. Rheological properties of the components essentially affected the morphology of the blend and thereby the electrical…
We examine the B dosage dependence of the lattice and electronic structures of a heavily B doped layer formed by multiple-energy B-implantation into diamond (up to 1.7×1017Bcm−2) at an elevated temperature. The resultant highly B doped diamond layer exhibits p-type conduction with very low sheet resistance of 90Ω∕◻ (0…
The hydrogen desorption kinetics from pure and Nb-doped MgH2 samples was studied as function of the Nb concentration (6×10−4<[Nb∕Mg]<5×10−2). Structural and kinetics analyses indicate that Nb acts as catalyst both when Nb atoms aggregate forming NbH clusters dispersed in the MgH2 and also when Nb is cont…
White-light-emitting CdSe quantum dots (QDs) were synthesized at room temperature (RT, ∼23°C) using an organometallic colloidal growth process. These QDs are characterized by high and reproducible quantum yields (ΦPL∼0.4) as well as by unusual spectral broadening [full width at half maximum (FWHM) ∼150nm) despite of t…
The operation of a polypyrrole thin-film field-effect transistor at room temperature is reported. The polymer film is prepared by a technique based on chemical polymerization, which is capable of forming thin films with low roughness. The technique is compatible with conventional silicon processing and allows a lithog…
Abstract Summary: Via a batch process in an autoclave, foam processing of intercalated PC/clay nanocomposites, having different amounts of clay, has been conducted using supercritical CO 2 as a foaming agent. The cellular structures obtained from various foaming temperature‐CO 2 pressure ranges were investigated by SE…
The effect of (LiCe) substitution for A site on the properties of (NaBi)0.48◻0.04Bi2Nb2O9 (NB◻N)-based ceramics was investigated. The coercive fields (EC) of NB◻N)-based ceramics were significantly decreased from 61.0to32.5kV∕cm and the Curie temperature (TC) gradually decreases from 820to803°C with increasing the (Li…
Ultrananocrystalline diamond is a unique form of carbon with grain sizes in the 3-5 nm region. This nanostructure has profound implications on electronic transport, as ~10% of carbon is at the grain boundaries. Thus, this material has significant π bonding which governs the majority of the electrical conductivity due…
We have determined the thermal resistance for transferring heat between individual single-walled carbon nanotube devices and solid substrates. Using sapphire and comparing our results to previous results obtained from SiO2, we find that the resistance is dominated by interfacial resistance rather than the spreading re…
Abstract Summary: Acetamide‐plasticized SPI sheets, denoted SAm, were prepared by compress molding at 140 °C and 20 MPa. The compatibility between acetamide and SPI has been investigated by DSC, WXRD, optical transmittance and SEM. Strong hydrogen bonding interaction between SPI and acetamide was evidenced by FT‐IR sp…
Abstract Summary: Fiberboards were prepared using phenolic type resins (phenol‐formaldehyde) and sugarcane bagasse fibers. Lignin extracted through an organosolv process from sugarcane bagasse was used as substitute of phenol in phenolic resins from 40 (lignin‐phenol‐formaldehyde) to 100 wt.‐% (lignin‐formaldehyde) su…