Synthesis of SiVPI-5 with enhanced activity in acid catalysed reactions
A novel method for the synthesis of silicon-substituted aluminophosphate VPI-5 with enhanced acid catalytic activity is described.
Materials Literature
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Fossil Continental Diatoms: Paleolimnology, Evolution, and Biochronology
Diatoms are golden brown algae (class Bacillariophyceae) whose cellular contents are enclosed between two valves or shells of silica. They are classified into groups with radial symmetry (centric diatoms) and axial symmetry (pennate diatoms). The latter are subdivided as raphid and araphid diatoms according to the pre…
Influence of microstructure on micromagnetic Barkhausen emissions in AISI 4140 steel
The effects of microstructure on the micromagnetic Barkhausen signal emissions in AISI 4140 steel are reported. The Barkhausen signal amplitude is known to be highly sensitive to the type and distribution of microstructural inhomogeneities, such as grain boundaries, precipitates and dislocations. The Barkhausen measur…
Negative Photochromism of 3,1′-Trimethylene-Bridged 6-Nitroindolinospiropyran
Abstract A new photochromic nitroindolinospiropyran with a 3,1′-trimethylene bridge was synthesized. Different from the non-bridged spiropyrans it exists mainly as the colored twitter-ionic open form in polar solvents. The following values in CHCl3, DMSO, and CH3OH at 20 °C were determined: (1) molar absorption coeffi…
Physical and Spectroscopic Studies of the Nucleation and Growth of Copper Thin Films on Polyimide Surfaces by Chemical Vapor Deposition
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and Spectroscopic Studies of the Nucleation and Growth of Copper Thin Films on Polyimide Surfaces by Chemical Vapor DepositionNoo Li Jeon and Ralph G. NuzzoCite this: Langmuir 1995, 11, 1, 341–355Publication Date (Print):January 1, 1995Publication History Published…
X-ray photoelectron spectrum of glassy B2S3. Experimental and theoretical study
The electronic structure of glassy B2S3 has been investigated using X-ray photoelectron spectroscopy and the B 1s and S 2p binding energies of this very hygroscopic material have been unambiguously determined. In addition to the experimental analysis of the core and valence spectra, theoretical models have been used (…
Thermal and diffusion-induced stresses in crystalline solids
The stressed crystal that has been obtained during the crystallization process is considered with particular attention given to the comparative numerical analysis of composition and temperature gradients as the causes of the stressed state. The numerical calculations are referred to the directional solidification meth…
Resolution of the Stick-slip Friction Traces of Fabrics
Some new frictional parameters of fabrics determined by the trace analysis of their stick-slip friction property is reported. Both scouring and mercerization processes induce structural consolidation which in turn can increase the frictional resistance, number, amplitudes of the stick-slip, and the differential fricti…
Potential pH Diagram at Elevated Temperatures for Metal-CO2/H2S-Water Systems and the Application for the Corrosion of Pure Iron
In the analysis of corrosion behaviors of metals in oil & gas well and chemical plants containing CO2 and/or H2S gas, detailed knowledge of a stable corrosion product and its solubility is essential. Thus, a computer program has been developed that can automatically construct the potential-pH diagram and calculate the…
Characteristics of polyimide liquid crystal alignment films for active matrix-lcd use.
Synthesis, characterization, and liquid crystal (LC) aligning capability of polyimide (PI) for the active matrix (AM) liquid crystal display (LCD) application are demonstrated and discussed. The synthesized PI materials in this research are featured by: 1) a low curing temperature below 200°C due to their organic-solv…
Hosloppin, a New Pyrone-Substituted Flavonoid from Hoslundia opposita
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHosloppin, a New Pyrone-Substituted Flavonoid from Hoslundia oppositaBonaventure T. Ngadjui, Apollinaire Tsopmo, Johnson F. Ayafor, Joseph D. Connolly, and Hélène TamboueCite this: J. Nat. Prod. 1995, 58, 1, 109–111Publication Date (Print):January 1, 1995Publication History…
Localized Corrosion of Copper in Wet Organic Acid Vapor
Copper tubes suffer from severe localized attack during storage after rinse and de-greasing process in organochlorine solvents. This type of corrosion is triggered by condensed organic acid vapor, e.g. acetic and formic acids that are decomposition products of the solvents used for rinsing and de-greasing of copper tu…
Relationship Between Radical Scavenging Effects and Anticorrosive Properties of Polyphenols
The radical scavenging effects and anticorrosive properties of polyphenols (gallic acid [GA] and two gallotannins) that contained ortho-trihydroxyl aromatic rings but different numbers of GA moieties and different molecular masses were studied. Scavenging of the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) by the poly…
Dynamics and conformational properties of Rouse polymers in random layered flows
Abstract Here we study the dynamics and the conformational properties of Rouse polymers in random layered flows. We obtain explicit expressions for the mean squared displacement of the center of mass of the polymer as a function of time and number of beads. The averages involve both the thermal noise and the realizati…
Platinum-a non-inert material reacting with oxides
Platinum is a non-inert material which reacts with oxides when in contact at high temperatures. The degree of such reactions depends strongly on the oxygen partial pressures established in the environment of the Pt-oxide reaction couple. If the oxygen partial pressure is decreased, oxygen is released due to (i) the di…
Sugar-controlled association and photoinduced electron transfer in boronic-acid-appended porphyrins
Complexation–decomplexation equilibria between boronic-acid-appended porphyrins and naphthalenedisulfonates or anthraquinonedisulfonates can be efficiently controlled by the addition of saccharides: this finding is readily applied to the saccharide-controi of photoinduced electron-transfer processes.
Purification by Sweating of Organic Solid Solutions by Layer and Suspension Type Melt Crystallization Operations.
In order to provide a quantitative basis to discuss the efficiency of purification of organic mixtures achieved by layer or suspension type melt crystallization operations, experiments of purification by sweating were carried out with naphthalene-benzothiophene solid solution mixtures. The rate and the degree of compo…
Phase-shifting transformer with fixed phase between terminal voltage and voltage boost: tool for transient stability margin enhancement
The development of power electronics has enabled rapid and nearly continuous control of phase-shifting transformers (PSTs). As a consequence, new possibilities for solving problems concerning not only steady-state but also dynamic conditions in power systems are offered by electronically controlled PSTs. In the paper,…
Assessment of the Corrosion Behavior of SS 304L in Nitric Acid Environments—An Alternative Approach
Abstract Stainless steel (SS) 304L is widely used as a construction material in industries requiring corrosion resistance in nitric acid environments. Representative samples from 20 heats of SS 304L products were subjected to a testing procedure consisting of testing as per the rapid screening test (Practice A) and th…
Nonlinear optically active polymethacrylates with high glass transition temperatures
Abstract A number of novel nonlinear optically (NLO) active polymethacrylates were prepared from the NLO active methacrylates 2a–d with azobenzene side groups and the bulky comonomer 1‐adamantyl methacrylate. The polymers exhibit unusually high glass transition temperatures between 160°C and 190°C. The copolymerizatio…