VPI-7: the first zincosilicate molecular sieve containing three-membered T-atom rings
VPI-7: the first microporous zincosilicate to contain 3-membered rings (3MR) is reported.
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Infrared spectroscopic studies of the reactions of alcohols over group IVB metal oxide catalysts. Part 2.—Methanol over TiO 2 , ZrO 2 and HfO 2
Infrared spectroscopy has been used to analyse the gas-phase reaction products, and the related adsorbed species, obtained from the decomposition of methanol over TiO2, ZrO2 or HfO2 catalysts after consecutive 10 min heating periods at 50 °C intervals between room temperature and 400 °C. Somewhat different results wer…
Carbon black filled natural rubber. 1. Structural investigations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon black filled natural rubber. 1. Structural investigationsJ. C. Kenny, V. J. McBrierty, Z. Rigbi, and D. C. DouglassCite this: Macromolecules 1991, 24, 2, 436–443Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 J…
Colloidal carriers for controlled drug delivery and targeting : modification, characterization, and in vivo distribution
INTRODUCTION. THE CONCEPT OF CONTROLLED DRUG DELIVERY AND DRUG TARGETING. INTERACTION OF I.V. ADMINISTERED CARRIERS WITH BLOOD COMPONENTS AND THE RETICULOENDOTHELIAL SYSTEM. IN VIVO FATE OF I.V. ADMINISTERED DRUG CARRIERS. BIODEGRADABLE CARRIERS FOR DRUG DELIVERY. LOCALIZATION OF CARRIERS IN THE TARGET TISSUE. TARGETI…
Catalytic activity of supported heteropoly acids for reactions requiring strong acid centres
The effect of supports such as silica, alumina, amorphous aluminosilicate and magnesia on the activity of heteropoly acids (HPA) for reactions requiring strong and very strong acid sites has been studied. It has been found that 12-tungstophosphoric acid (HPW) mounted on alumina and silica catalyses cumene cracking at…
Compounding of Thermoplastic Starch with Twin‐screw Extruders
Abstract The compounding of thermoplastic starch can be regarded as a combined process consisting of extrusion cooking and plastic compounding. The quality of the product is determined largely by the degree of mechanical shear, temperature and water content. These parameters can be influenced both by the machine syste…
Oxide Growth Mechanism on Zirconium Alloys
In order to get a better understanding of the mechanisms governing corrosion of Zr-based alloys, several examinations have been performed on a variety of samples with uniform and nodular corrosion and different oxide layer thicknesses. The results point to a barrier layer concept. The oxide layer becomes porous at a c…
Ultrasonic degradation of polymer solutions. 1. Polystyrene revisited
Abstract The results of ultrasonic irradiation of polystyrene solutions in toluene, benzene and carbon tetrachloride are described. The effect of a range of conditions such as ultrasonic intensity, solution concentration and varying solvents were investigated. The non‐random nature of the degradation process was clear…
Highly conjugated π-electron donors for organic metals: synthesis and redox chemistry of new 1,3-dithiole and 1,3-selenathiole derivatives
The bis(1,3-dithiolium) dication salts 8a–c have been synthesised in three steps (31–51% overall yields) starting from 1,4-bis(bromomethyl)naphthalene, 9,10-bis(chloromethyl)anthracene and 4,4′-bis(chloromethyl)biphenyl, respectively. The bis(halogenomethyl) compounds 5 were converted into the dipiperidiniumbis(dithio…
Energy Deposition in Small Cylindrical Targets by Monoenergetic Electrons
Calculations of energy deposition in cylindrical target volumes of diameter and height 1-100 nm, including those similar to the dimensions of biological molecules and structures such as DNA, nucleosomes and chromatin fibre, have been made. The calculations used the Monte Carlo track structure program MOCA8B for electr…
Structure and properties of partially neutralized poly(acrylic acid) gels
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and properties of partially neutralized poly(acrylic acid) gelsF. Schosseler, F. Ilmain, and S. J. CandauCite this: Macromolecules 1991, 24, 1, 225–234Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January…
Raman Spectroscopy Study of the Tetragonal-to-monoclinic Transition in Zirconium Oxide Scales and Determination of Overall Oxygen Diffusion by Nuclear Microanalysis of O18
Two allotropic forms of zirconium oxide, monoclinic and tetragonal, have been identified in the scales formed on zirconium alloys. The transition from tetragonal to monoclinic has been followed by X-ray measurements and Raman laser spectroscopy. Information on the average content of the tetragonal phase was obtained b…
Reliability of optical fibers exposed to hydrogen: prediction of long-term loss increases
Hydrogen-induced loss increases are known to occur in optical fibers, due both to the presence of molecular H<sub>2</sub> and to the reaction of hydrogen with defects in the fibers. To predict the long-term loss increases expected for fibers under normal conditions, it is necessary to rely on accelerated aging experim…
Ferroresonance in power systems: Fundamental solutions
Ferroresonance can occur in power transformers or reactors fed through capacitive coupling from neighbouring phases or lines. Ritz's method of harmonic balance is used to formulate an analytical solution to the problem of fundamental frequency ferroresonance. A two-term polynomial of order 11 is used to accuratel…
OBJECTIVE MEASUREMENT OF FABRIC MECHANICAL PROPERTY AND QUALITY:
Textiles as clothing material must fit the human body and senses. This fitting is an important performance of the textiles besides the utility performance of textiles such as fabric strength. For many years, the performance concerning this fitness has been evaluated subjectively by hand judgement. The fabric property…
Redox-switched molecular aggregates: the first example of vesicle formation from hydrophobic ferrocene derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox-switched molecular aggregates: the first example of vesicle formation from hydrophobic ferrocene derivativesJulio C. Medina, Isabelle Gay, Zhihong Chen, Luis Echegoyen, and George W. GokelCite this: J. Am. Chem. Soc. 1991, 113, 1, 365–366Publication Date (Print):Januar…
CERAMIC COATINGS BY ANODIC SPARK DEPOSITION
A wide range of ceramic coatings has been deposited on metal substrates by a reaction occurring during dielectric breakdown at the anode surface in an electrochemical cell, which is accompanied by visible sparking at the anode/electrolyte interface. While the majority of work reported has been on oxide coatings deposi…
Developments in EELS instrumentation for spectroscopy and imaging
Recent developments in instrumentation for electron energy loss spectroscopy (EELS) at Gatan R&D are reviewed. A 10-channel intrinsic Si detector with single-electron detection capa- bility is being developed for fast energy-filtered imaging and elemental mapping in the STEM mode. A new type of an imaging filter…
Saturation of the nonlinear index of refraction in semiconductor-doped glass
Interferometric measurements of saturation of the nonlinear index of refraction in a semiconductor-doped glass (Schott OG 550) are reported. The index change, measured at a wavelength of 532 nm, reaches a maximum value of ~1.5 × 10−4 at high intensity. It is shown that the magnitude of the corresponding third-order su…
High‐Toughness Ce‐TZP/Al 2 O 3 Ceramics with Improved Hardness and Strength
Simulataneous additions of SrO and Al 2 O 3 to ZrO 2 (12 mol% CeO 2 ) lead to the in situ formation of strontium aluminate (SrO · 6Al 2 O 3 ) platelets (∼0.5 μm in width and 5 to 10 μm in length) within the Ce‐TZP matrix. These platelet‐containing Ce‐TZP ceramics have the strength (500 to 700 MPa) and hardness (13 to…