Materials Literature
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Abstract (η4-1,5-Cyclooctadienyl)rhodium(I) complex with a bidentate N21, N22-bridged porphyrin ligand was prepared. The η4-1,5-cyclooctadiene ligand was easily replaced by carbon monoxide to give the corresponding (dicarbonyl)rhodium(I) porphyrin. The structures of these two complexes were proven by X-ray crystallogr…
Abstract Perylene nanoparticles with different sizes were prepared by reprecipitation method. It is found that the nanoparticles show size‐dependent optical property. Electron diffraction patterns indicate that all the nanoparticles of different sizes are in crystalline state. The rapid growth of the nanoparticles dur…
This paper reports on the results of experimental investigations into the thermal conductivity of GaS and GaSe layered semiconductor crystals in directions parallel and perpendicular to the crystal layers in the temperature range 5–300 K. Specific features of the thermal conductivity of these crystals are analyzed.
A differentially pumped pressure cell has been developed to enable in situ low-energy ion scattering (LEIS) analysis of catalysts during chemical reactions. The cell is fully compatible with an electrostatic analyzer and is, therefore, very well suited to study rough, highly dispersed catalysts. The pressure cell is a…
We report the measurements of charge collection efficiency for nuclear particle detectors made from electronic-grade chemical vapor deposition (CVD) diamond samples with thicknesses of 20 and 150 /spl mu/m fabricated at CEA/LETI. Although it is well established that the transport properties of CVD diamond, and more sp…
To improve the production of oligo-1,6-glucosidase from the obligately thermophilic Bacillus thermoglucosidasius KP1006 in Escherichia coli, the combined expression of oligo-1,6-glucosidase with various chaperone proteins of Hsp (heat-shock protein) 60 team proteins (GroES and GroEL) or Hsp70 team proteins (GrpE, DnaK…
The rejection of ball bearing steel rounds had increased at Bar Mill due to surface defects following an increase in the demand for a better surface quality. The genesis of surface defects in ball bearing steel rounds is attributed to steel‐making and rolling processes. The steel‐making defects are exogenous in nature…
An examination of synthetic crystalline material by single crystal X-ray diffractometry reveals a unit-cell dimension that was previously ascribed to tincalconite. However, the best fit to the reflection data obtained at 291(2) K is obtained with composition Na 6 [B 4 O 5 (OH) 4 )] 3 ·8H 2 O. This formula is different…
Polycrystalline silicon dots have been deposited on silicon-coated SiO2 substrates from silane irradiated with a continuous wave (cw) argon ion laser and a cw CO2 laser. Various experimental configurations were adopted for laser-assisted chemical vapor deposition of Si dots. The cw argon ion laser was focused either d…
This paper presents a new methodology to evaluate mechanical formation damage due to drilling and oil production. The methodology covers a wider range of stress path adding new insight to fluid flow analysis in porous media. In some reservoirs occur large deformations during oil production due to the increasing of eff…
The encapsulation process of a filament-forming bicopper complex within the fibrils of an isotactic polystyrene (iPS) thermoreversible gel has been studied as a function of the solvent isomer. Differential scanning calorimetry (DSC) and small-angle neutron scattering (SANS) have been used. It is observed through the e…
A geometric textile modelling package (modeller) is being developed, which forms the basis for a number of software tools predicting the processing properties of textile reinforcements and the final properties of composite parts. The modeller can provide interlacing patterns representing any textile reinforcement in a…
Photoluminescence and cathodoluminescence properties of SrGa 2 S 4 : Eu 2+ thin films prepared by reactive RF magnetron sputtering are investigated. Luminescence performances of the phosphor in the thin film form are compared to those of powder samples: the brightness efficiency of thin films is found to be about 30%…
Determination and Fate of Formic Acid in High Temperature Acid Stimulation Fluids M.I. Al-Katheeri; M.I. Al-Katheeri Saudi Aramco Search for other works by this author on: This Site Google Scholar H.A. Nasr-El-Din; H.A. Nasr-El-Din Saudi Aramco Search for other works by this author on: This Site Google Scholar K.C. Ta…
Substrate biasing is an emerging technique extensively used in diamond and cBN chemical vapor deposition (CVD) processes. Direct current bias voltages between -400 V and +500 V are here applied to a diamond deposition surface in an RF induction thermal plasma CVD system. This is made possible by introducing a high-imp…
An excellent supersilylation agent, supersilyl triflate, tBu 3 SiO 3 SCF 3 , is easily obtained from tBu 3 SiH and CF 3 SO 3 H. Supersilyl triflate, tBu 3 SiO 3 SCF 3 , reacts with lithium amide or lithium hydrazide to form the supersilyl amine, tBu 3 SiNH 2 , or the supersilyl hydrazines, tBu 3 SiNHNH 2 and tBu 3 SiN…
The crystal structures of telyushenkoite, ideally Cs Na6 [Be2 Al3 Si15 O39 F2], trigonal, space group P 3 m 1, a 14.3770(8), c 4.8786(3) A, V 873.2(1) A3, Z = 1, and leifite, ideally Na Na6 [Be2 Al3 Si15 O39 F2], trigonal, space group P 3 m 1, a 14.361(1), c 4.8570(5) A, V 867.5(2) A3, Z = 1, have been refined to R in…
New thermotropic mesomorphic compounds containing a [2.2]paracyclophane (PC) unit were synthesized and investigated (Scheme). Carboxylic acids were selected as the starting PC building blocks. The influence of structural features on the stability of the mesomorphic phases was studied (Figs. 1 and 2): for this purpose,…
Characteristics of an ion beam surface modification system with a linear ion source are described in this article. The linear ion source is principally based on an anode layer thruster, which is generally referred to as “closed drift thruster.” The linear ion source has a slit type racetrack-shape extraction geometry.…
An alkoxide sol–gel route was developed to prepare forsterite fibers. Transparent precursor gel fibers were converted to the crystalline phase of forsterite by heating above 550°C. Fibers heated at 1100°C for 2 h showed a porous microstructure with nanocrystalline sizes of about 50–100 nm. The structural evolution of…