Electron transfer across vesicle bilayers
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Improved thermal conductivity in microelectronic encapsulants
Several thermally conductive ceramics in combination with different polymer matrices have been examined. The interdependence of thermal conductivity with other key properties of the polymer composites are discussed. Selection of the filler and the resultant filler content in semiconductor grade molding compound are di…
Electron imaging and diffraction study of individual crystals of bone, mineralized tendon and synthetic carbonate apatite
A transmission electron microscope study of carbonate apatite crystals isolated from bone and mineralizing tendon, as well as those produced synthetically under approximated-physiological conditions, shows that they are thin irregular shaped plates. Electron diffraction patterns of individual crystals confirm that the…
Trivalent boron as acceptor chromophore in asymmetrically substituted 4,4′-biphenyl and azobenzene for non-linear optics
[4′-(Dimethylamino)biphenyl-4-yl]dimesitylborane (BNB) and [4′-(dimethylamino)phenylazophenyl-4-yl]dimesitylborane (BNA) have been prepared and studied by a solvatochromic technique. The high second-order hyperpolarisability coefficients βCT determined by this technique, 37 and 240 × 10–30 esu, respectively, show that…
Graft copolymer compatibilizers for blends of polypropylene and ethylene-propylene copolymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGraft copolymer compatibilizers for blends of polypropylene and ethylene-propylene copolymersDavid J. Lohse, Sudhin Datta, and Edward N. KresgeCite this: Macromolecules 1991, 24, 2, 561–566Publication Date (Print):January 1, 1991Publication History Published online1 May 2002…
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.
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…