Materials Literature
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Mesoporous manganosilicate materials Mn-M41S, having hexagonal, cubic and lamellar structures, are synthesized with a low surfactant: Si ratio (0.12 : 1) at various temperatures and acid/base contents and are characterized by X-ray powder diffraction and Q-band EPR spectroscopy.
Abstract Simulations of the structure and dynamics of fluid films confined to a thickness of a few molecular diameters are described. Confining walls introduce layering and in‐plane order in the adjacent fluid. The latter is essential to transfer of shear stress. As the film thickness is decreased, by increasing press…
A new computer code (MARVIN), employing two-dimensional (2D) periodic boundary conditions, has been developed for the simulation of surfaces and interfaces. The models and methodologies incorporated within the program are discussed. The utility of the program in calculating crystal morphologies is explored using α-Al2…
Two different methods for CuO powder, mounting using adhesive tape and compressed powder pellets were compared as to how these methods influence the XPS measurements. In Ar+ sputtering, these methods showed differences in the extent of selective sputtering by oxygen and the reduction rate. In a long period of sputteri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Dimensions in Amorphous Polymer MeltsZhen-Gang WangCite this: Macromolecules 1995, 28, 2, 570–576Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://pubs.acs.org/doi/10.1021/ma00106a022https://do…
The synthesis of some new chiral radial pentaynes exhibiting enantiotropic cholesteric discotic (ND*) phases at moderate temperatures is presented. By alteration of the lateral substituents we were able to obtain the phenomenon of selective reflection as well as a temperature induced helix inversion. In the latter, di…
Arbitrary dynamic magnetostriction under alternating and rotating field is measured by using a two-dimensional magnetic measurement technique with a three-axial strain gage, which provides its output in a direction inclined 45/spl deg/ 90/spl deg/, and 135/spl deg/ to the rolling direction of a sample sheet. By this t…
The degradative changes in silk are investigated with amino acid analysis and solubility under denaturing conditions (7M urea). These biochemical techniques use extremely small samples for quantitative analyses and are capable of detecting chemical alterations at the molecular level. The biochemical results are used t…
The chemistry of molten fluorides is traced from their development as fuels in the Molten Salt Reactor Experiment with important factors in their selection being discussed. Key chemical characteristics such as solubility, redox behavior, and chemical activity are explained as they relate to the behavior of molten fluo…
This paper presents the stem effect correction factors for the NE2561 and NE2571 ionization chambers calibrated in air and used at a depth in a phantom irradiated by medium-energy x-ray beams. The in air and in phantom stem effect correction factors were calculated as the ratios of the absorbed dose in the air cavity…
Three commonly used ferroelectric actuator and sensor materials, namely polyvinylidene fluoride copolymers, lead zirconate titanate piezoceramics (PZT), and lead magnesium niobate-lead titanate relaxors (PMN-PT) at low PT content, are characterized with respect to temperature and driving field amplitude. It is shown t…
Abstract The reactions of ninhydrin ( 1 ) with β‐ketoesters and β‐diketones were studied. Two kinds of products were observed, which were either simple adducts of the dicarbonyl compounds to the center carbonyl group of ninhydrin, or tricyclic indeno[1,2‐ b ]furans. Treatment of methyl 3‐aminocrotonate ( 2 ) with ninh…
High purity ceramic materials like alumina ceramics, which can be offered with novel formations and modifications using advanced processing techniques, offer a wide spectrum of enhanced properties such as high mechanical strength, wear resistance, corrosion resistance, capability to withstand high temperatures and the…
2-Thioxo-1,3-dithiole-4,5-dithiolate reacts stereospecifically with the cyclic sulfate ester of R,R-1,4-difluorobutane-2,3-diol by two nucleophilic attacks, ring opening of the cyclic sulfate ester at carbon and displacement of the nearer fluorine atom, to form a derivative of the 1,3-dithiolo[4,5-b]-1,4-dithiin ring…
Accelerated durability tests are commonly used with the intent of predicting service performance. To make these predictions it is necessary to extrapolate the accelerated data to service conditions. A review is given of a number of techniques and models used to extrapolate data from ageing and environmental resistance…
The thermolytic decomposition of citric acid in the presence of tin/lead solder has been investigated. The solid reaction products were first examined by solid-state 13 C NMR. The samples were then dissolved in D 2 O, and 1 H and 13 C 1D and 2D (HMQC, TOCSY) spectra were obtained. Results indicate the presence of a se…
An effective acceleration technique using digital feedback to control the flux waveform of a single sheet tester has been developed. In this technique, the waveform of the applied voltage is pre-estimated using the equivalent circuit equation. The convergence characteristic of the proposed method using the new techniq…
On the corrosion protection of carbon steel by sol-gel derived TiO2 coating under the illumination of light, the photoelectrochemical behavior of TiO2/steel system is investigated. The diffusion of Fe ions into TiO2 in the heat treatment of the coating process greatly degrades the photo-effect of TiO2 coating. An Fe o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature Effect on the Sonolysis of Methanol/Water MixturesDmitrii N. Rassokhin, Georgii V. Kovalev, and Lenar T. BugaenkoCite this: J. Am. Chem. Soc. 1995, 117, 1, 344–347Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inis…
Highly reactive and ultra-fine barium polytitanates (BaO-nTiO2, n= 4, 4.5, 5) with a particle size of 30–50 nm have been prepared by the citrate route. Solubility isotherms were calculated for the BaCO3-citric acid-H2O and TiO(OH)2-citric acid-H2O2-H2O systems at 25 °C to predict the optimum pH condition for preparing…