Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn-situ electron microscopy studies of the behavior of supported ruthenium particles. 2. Carbon deposition from catalyzed decomposition of acetyleneR. T. K. Baker and J. J. Chludzinski Jr.Cite this: J. Phys. Chem. 1986, 90, 20, 4734–4738Publication Date (Print):September 1,…
Abstract Two distinguishable effects of thermal exposure of biaxially oriented poly(ethylene terephthalate) (PET) have been observed in the temperature range from room temperature to 140°C. Upon heating above the glass transition temperature T g of the film an irreversible shrinkage of a few percent occurred with a co…
Abstract In an attempt to modify water‐soluble synthetic polymers, graft Copolymerization of methylmethacrylate (MMA) and ethyl acrylate (EA) onto poly(vinyl alcohol), PVA, has been studied by using gamma irradiation from a Co 60 source as initiator. The graft copolymerization was carried out in an aqueous medium by t…
ABSTRACT We have examined the influence of temperature, protein synthesis, and energy metabolism on the process of silicon biomineralization in synchronized cultures of the diatom Navicula saprophilia Lange‐Bertalot & Bonik (1976). Temperature effects on silicon polymerization were compared in vitro and in vivo. I…
The polycondensation kinetics of aromatic nucleophilic substitution on 1,4-dichlorobenzene by sodium sulfide has been investigated at 195°C in N-methyl pyrrolidone. The reaction follows second-order kinetics. The rate is bimodal with an initial slow rate till 50% conversion followed by a faster rate between 50 and 97%…
The present paper is concerned with the production of very low core loss grain-oriented silicon steel. Domain refining techniques and their mechanisms have been studied. A quantitative interpretation for the domain refining phenomena is not sufficient. However, it is anticipated that these results will be based on the…
Hexasubstituted tribenzocyclononene derivatives with R = -OC(O)C 6 H 4 C n H 2n+i and R = -OC(O)C 6 H 4 OC n H 2n+1 possess enantiotropic pyramidic mesophases. These mesophases exhibit an uncommon feature in that their optical anisotropy changes sign as function of temperature within the mesophase region. It is sugges…
A three-dimensional mathematical model was developed for calculating joule heat release, glass flow, and heat transfer in electric glass furnaces. The model developed here allows for multiple electrodes, multiphase firing, and for the feeding and withdrawal of molten glass. The model is fairly general with respect to…
The shear flow behaviour of the nematic liquid crystal 4-n-octyl-4'-cyano-biphenyl (8CB) was studied in a torsional shear flow apparatus. Experiments were performed near the smectic A-nematic phase transition, and they concentrated on the observation of the tumbling instability associated with a positive Leslie viscos…
Abstract Experimental measurements of the optical reflectance of solid adenine films have been obtained for photon energies extending from 1.8 to 80 eV. From these data we have established the complex index of refraction, the complex dielectric function, and the energy‐loss function Im(‐l/). Structure in the dielectri…
Abstract not Available.
Films of isotactic polypropylene (iPP) were quenched at different temperatures. Wide-angle x-ray diffractograms for these samples show the presence of the smectic form of iPP at low quenching temperatures and the appearance of mono-clinic form on increasing the thickness of the substrate and the quenching temperature.…
Properties of phosphosilicate glass (PSG) films deposited by the plasma chemical vapor deposition (CVD), low‐pressure CVD, and atmospheric CVD methods are compared. Stress behavior of plasma PSG films is almost the same as that of low‐pressure PSG films. The stress values change from compressive to tensile with increa…
Collagen was isolated from rat tail tendons and acetylated with 1-14C acetic anhydride. In situ adsorption of this collagen from a buffer solution (pH = 2.7) was measured at the interfaces to air, polyethylene and polyethylene grafted with poly(maleic acid), respectively. The kinetics of adsorption were recorded for a…
Following removal of most of the telopeptide regions with pepsin, bovine dermal collagen gelled more slowly to form fibrils with a weak banding pattern. The reduction in gelling rate reflected an increase in the length of the nucleation phase and a lower rate of turbidity increase during the growth phase; the activati…
Five chemical decontamination processes have been developed for nuclear reactor applications. One of these processes is the cerium decontamination process (CDP). This method uses a cerium acid reagent to rapidly decontaminate surfaces, obtaining decontamination factors in excess of 300 in 6 h on pressurized water reac…
Using ultrasonic methods at ambient temperatures, for niobium carbide we determined the monocrystalline elastic stiffnesses: C11, C12, and C44 in Voigt’s contracted notation. From these, we calculated the quasi-isotropic (polycrystalline) elastic constants and the elastic Debye characteristic temperature. Results deri…
Complex alkali-borosilicate glasses are being studied, and used, as media for radioactive waste encapsulation. The effects of radiation from α-decay processes on the physical properties of such glasses is of interest. The energy deposited in the glass by such decay processes can be simulated by ion implantation. We ha…
A review of previously published hypotheses concerning phylogenetic relationships in the diatom family Achnanthaceae is presented. Data for characters such as valve ultrastructure, chloroplast number and morphology, and sexual reproduction for the genera Cocconeis, Achnanthes and Rhoicosphenia and their purported bira…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrophobic particles on the foaming of aqueous surfactant solutionsMichael P. AronsonCite this: Langmuir 1986, 2, 5, 653–659Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.ac…