Materials Literature
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The low-temperature single-crystal absorption spectrum, far-infrared spectrum and single-crystal structure determination of [Ni(tacn)2][ClO4]2·H2O (tacn = 1,4,7-triazacyclononane) are reported. The compound crystallizes in the monoclinic space group P21/a(Z= 2) with a= 9.614(3), b= 13.451(6), c= 9.648(4)Å and β= 120.1…
Laser-induced multiphoton and SF6-photosensitised decomposition of tetramethoxygermane has been used for chemical vapour deposition of reactive organooxogermanium polymers, which were characterised by IR, VIS, and UV spectra and ESCA and TEM techniques. The properties of the deposited layers differed depending on the…
In view of the limitations inherent to phenomenological approaches, the problem of the internal structure of defects in nematics is here afforded from a molecular viewpoint. By using an extension of the Maier-Saupe mean-field potential which accounts for distorted states of nematics, the general equation applicable in…
The nickel(II) complex of the pendent-arm macrocycle 1-(3-dimethylaminopropyl)-1,5,9-triazacyclododecane (L1) sequesters CO2 from air to yield, after addition of thiocyanate ion, [{(HL1)Ni(NCS)}2(CO3)]2+, the first example of a µ-carbonato dinickel(II) complex; the Ni atoms are antiferromagnetically coupled with the e…
Space charge distributions of PLZT 8/65/35 were measured by the laser intensity modulation method. The effect of space charge on the micro-macro domain transition is shown. Large differences in the depolarization temperature T/sub d/ measured on heating and cooling are due mainly to the effect of space charge.>
The combined influence of temperature and food concentration on Pteria sterna growth was determined, using 3 temperatures and 3 food concentrations. During 15 wk, the shell was measured weekly along the axis of maximum growth. The 2 higher growth rates (4.8 and 4.2 mm mo-') were obtained with the highest ration, at 30…
Abstract Low reaction rates and distinct transition phenomena from the solid to the melt state restrain solid state polymerisation (SSP) reactions of nylon salts for industrial application. To alleviate these problems, catalysts containing nylon salts are employed. In this study, hexamethylenediammonium adipate (HMA)…
A kinetic study has been made on the reduction of iron oxide in molten slag with graphite. The composition of the primary slag was changed so that SiO2 concentration varied between 0.33 and 0.50 mole fraction, and slag basicity between 1 and 2. The experimental temperature was 1300°C. The reaction rate is significantl…
Improving the quality of our environment has become a growing concern in this country and around the globe. Research efforts in this field have recently been accelerated by the passage of the 1990 Clean Air Act. This book reports on a symposium that is part of a continuing series on the surface science of catalysis. I…
The electric strength of air, in millimeter gaps, decreases at frequencies exceeding 100 kHz, but the effect on the discharge inception voltage V/sub i/ in solid insulation is too small to explain the reduction in the short-time breakdown voltage V/sub st/ of solids at radio frequencies. When breakdown is caused by in…
Measurements on polymers (Teflon, FEP and Mylar) have shown that the secondary electron emission from uncharged surfaces exceeds that from surfaces containing a positive surface charge. The reduced emission of charged surfaces is due to recombination between electrons undergoing emission and trapped holes within the c…
A liposome-associated doxorubicin formulation that has been utilized in two phase I clinical trials at two separate medical centers is described. This work deals with formulation optimization, process development, quality control assays on raw materials, characterization assays for these liposomes, and their short-ter…
The effects of cold deformation on the morphology of α precipitates were examined for three β titanium alloys which were each mainly deformed by slip, twinning, and stress-induced martensitic transformation.Although α precipitated preferentially at β grain boundaries in the undeformed specimens, slight deformation (5%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence band photoemission studies of corrosion inhibitor action on iron surfaces: effect of etidronateIan D. Welsh and Peter M. A. SherwoodCite this: Chem. Mater. 1992, 4, 1, 133–140Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Publis…
Composites based on chopped ultra high modulus polyethylene fibers (UHMPE) and low density polyethylene (LDPE) were prepared in the melt state. It is shown that the UHMPE fibers do not melt during the preparation operations, and an im portant enhancement of the mechanical properties is obtained as a function of fiber…
SiC composites (C/SiC) reinforced with unidirectionally oriented carbon fibers were fabricated by the pressureless sintering method completed with infiltration of polycarbosilane (PC). This method is effective for increasing density and strength of the composite.The open porosity of C/SiC of 10% was achieved after 10…
Abstract The combination membrane of poly(1‐trimethylsilyl‐1‐propyne) with enormously high permeability and poly(vinylimidazole)‐bound porphinatocobalt with selective oxygenbinding ability was prepared. Oxygen transport through the membrane was facilitated in terms of oxygen transport via the latter domain as a fixed…
To clarify the effect of alloying elements on transformation behavior of destabilization heat treated high chromium cast irons, specimens of high chromium hypoeutectic cast irons containing copper and molybdenum were destabilization heat treated at 900, 1000 and 1100°C for 5×102 to 5×104 sec and then rapidly cooled do…
Connective tissue substitute can be made of collagen sponge-shaped matrice which is reconstituted by freeze-drying a collagen dispersion. This procedure is then followed by a crosslinking treatment to decrease the in vivo biodegradation rate. In the present study, collagen dispersions made of collagen fibrils with a D…
We use density-functional theory to derive an expression for the distortion free energy of molecular ordered phases and expand it in terms of the order parameters characterizing the structure of the phase and the molecular correlation function of an effective isotropic liquid. We derive expressions for the elastic con…