Materials Literature
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Different models for the theoretical description of bare crystalline surfaces are compared and discussed in terms of stoichiometry and conservation of point symmetry. While infinite models such as the semi-infinite model or the slab model generally preserve the symmetry of the perfect crystal surface, special care has…
Water molecules retained in native cellulose gels obtained from Acetobacter xylinum (AX) were displaced by poly(ethylene glycol)s (PEG) of different molecular weight. The so obtained native cellulose/PEG material, characterized in film form by differential scanning calorimetry, dynamic mechanical thermal analysis and…
The electronic structure of a ferroelectric Bi 4 Ti 3 O 12 (BIT) thin film was investigated by soft-X-ray emission spectroscopy (SXES). In the valence band energy region, Ti 3 d and O 2 p partial density of states were observed in O 1 s and Ti 2 p SXES spectra. The energy position of the Ti 3 d state overlapped with t…
The performance of a spherical field-free and a conical retarding-potential Mott polarimeter is compared. The stability of the detector signal with respect to a change in the position of the incoming electron beam is studied for two different primary electron beam energies. Shifting the incoming electron beam by 0.6 m…
Sulfate minerals commonly form in the oilfield environment due to secondary recovery operations. Two essential tools for identification of these minerals are Fourier transform infrared (FT-IR) and Raman spectroscopies. In this paper, a comprehensive database of the FT-IR and Raman spectra of these minerals has been co…
We have studied the characteristics of reactive ion etching for zinc telluride using CH4 and H2 gases. The effects of CH4/H2 gas composition, total gas pressure, and plasma power on the etching properties were investigated. It was found that variation of the CH4 concentration in gas mixtures leads to changes in both t…
This is the first protein intermediate obtained in the crystalline state by the simultaneous process of Fe(3+) binding and crystal nucleation and is also the first structure of an intermediate of lactoferrin in the Fe(3+) binding pathway. Lactoferrin is an iron-binding 80-kDa glycoprotein. It binds Fe(3+) very tightly…
CaBi 4 Ti 4 O 15 (CBTi144) and SrBi 4 Ti 4 O 15 (SBTi144) thin films were prepared on Pt-passivated silicon substrate using complex metal alkoxide solutions. The CBTi144 thin films crystallized to a single phase of perovskite at 650°C via a mixture of perovskite and pyrochlore phases. The 650°C-annealed CBTi144 thin f…
Abstract Mixed-layered phyllosilicates with composition intermediate between mica and chlorite were identified in very low-grade metaclastites from the Malàguide Complex (Betic Cordilleras, Spain), and studied by X-ray diffraction, and transmission and analytical electron microscopy. They occur both as small grains in…
Powder neutron thermodiffraction studies have allowed a precise determination of the magnetic phase diagrams of the $R{\mathrm{Mn}}_{12\ensuremath{-}x}{\mathrm{Fe}}_{x}$ series $({\mathrm{ThMn}}_{12}$ structure) with the occurrence of two different ordering temperatures ${T}_{N}$ and ${T}_{C}$ correlated, respectively…
The iron complex of 2(3),9(10),16(17),23(24)-tetra[1,5-di(3-triethoxysilyl-propyl)biuryl]phthalocyanine (1) was prepared by reacting iron tetraaminophthalocyanine with 3-(triethoxysilyl)propyl isocyanate. This complex was directly grafted onto silica to give a supported catalyst without preliminary modification of sil…
Reversible, supramolecular polymer networks based on commercially available bulk chemicals, and prepared using an industrially attractive route are described. The difunctional, low molecular weight polytetramethyleneoxide is functionalized with trimellitic imide, and reversibly crosslinked with the trifunctional melam…
A significantly large thermoelectric “figure of merit” in a bipolar semiconductor is achieved by converting it, by doping, into an essentially monopolar semiconductor. We show here, that for a bipolar semiconductor film, having a thickness smaller than the screening length, there is an alternative to doping to obtain…
Modification of a Monte Carlo simulation code, Erosion and Deposition based on DYnamic model (EDDY), for plasma-surface interactions in a designed tokamak, International Thermonuclear Experimental Reactor-Fusion Energy Advanced Tokamak (ITER-FEAT), and its application for erosion and redeposition of a carbon target in…
This article provides a review of the attitude of the scientific community towards reliability in electronic packages, with emphasis on the prevailing mechanisms for package failure under highly stressed environmental conditioning. Once this failure mechanism is fully developed, approaches to the resolution can be mor…
In this study, the dielectric, magnetic, and transport properties of Gd0.33Sr0.67FeO3 have been analyzed. The temperature dependence of resistivity exhibits the adiabatic small polaron hopping conduction; i.e., ρ/T=A exp(E/kBT), E being the small polaron hopping energy. The dielectric loss anomaly was found to be arou…
Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques were used to investigate the kinetics of thermochemical conversion of an agricultural residue, namely the straw and stalk of rapeseed plants. The thermal degradation characteristics and the kinetic parameters (order of reaction, activa…
Abstract Ground rubber tire (GRT) powders were chlorinated by trichloroisocyanuric acid (TCLCA). GRT powders of different chlorination levels were characterized by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDAX), attenuated total reflection infrared (ATR-IR) spectroscopy, thermal, d…
The effects of nitrogen incorporation into amorphous boron carbide (B4C) films were studied. The films were deposited by dc-magnetron sputtering with the Si substrates at room temperature. The nitrogen incorporation occurs at the expense of the boron content. The main feature of infrared absorption spectra obtained fr…
We describe an x-ray photoelectron spectroscopy spectrometer capable of determining the composition, thickness, and chemistry of thin film surfaces during growth. The instrument operates at pressures up to a few millitorr, an adequate range for many sputtering, low pressure chemical vapor deposition and thermal evapor…