104 research outputs found
Reticulated vitreous carbon as an electrode material
No full textAn illustrated review of reticulated vitreous carbon (RVC) as an electrode material is presented. Early uses of RVC were largely restricted to small-scale (<1 cm3) electroanalytical studies in research laboratories. RVC properties of a high ratio of surface area to volume and minimal reactivity over a wide range of process conditions, combined with low cost and easy handling, have resulted in a steady diversification of its applications both in research laboratories and in industry. The physical structure of RVC (in terms of pores per linear inch, strut length, strut thickness and area of the trigonal strut) is examined for 10, 30, 60 and 100 ppi (pores per linear inch) grades using scanning electron microscopy. The accurate measurement of these geometrical values presents both theoretical (in terms of definition of trigonal strut area, beginning and end of single strand) and practical problems (large differences in strut length and thickness in individual samples). Data are presented to show the relationships between geometrical properties. Applications include electroanalytical studies and sensors, metal ion removal, synthesis of organics and Fenton s reagent, H2O2 production and batteries/fuel cells
Characterization of the reaction environment in a filter-press redox flow reactor
No full textThe characteristics of a divided, industrial scale electrochemical reactor with five bipolar electrodes (each having a projected area of 0.72 m2) were examined in terms of mass transport, pressure drop and flow dispersion. Global mass transport data were obtained by monitoring the (first order) concentration decay of dissolved bromine (which was generated in situ by constant current electrolysis of a 1 mol dm?3 NaBr(aq)). The global mass transport properties have been compared with those reported in the literature for other electrochemical reactors. The pressure drop over the reactor was calculated as a function of the mean electrolyte flow velocity and flow dispersion experiments showed the existence of slow and fast phases, two-phase flow being observed at lower velocities
Enhanced mass transport to a reticulated vitreous carbon rotating cylinder electrode using jet flow
No full textThe mass transport characteristics of a porous, rotating cylinder electrode (RCE, 1.0 cm diameter; 0.5, 0.9 or 1.2 cm long; 1.25, 2.25, 3.00 cm3 overall volume; 250–2000 rpm speed) fabricated from reticulated vitreous carbon (RVC, 60 ppi or 100 ppi) were investigated. The deposition of copper from an acid sulfate electrolyte (typically, deoxygenated 1mM CuSO4 in pH 2, 0.5M Na2SO4 at 298 K) was used as a test reaction. The effect of a jet flow of electrolyte towards the electrode and the introduction of polypropylene baffles in the electrochemical cell were studied at controlled rotation rates of the RCE. The product of mass transport coefficient and volumetric electrode area (kmAe) is related to the rotation speed of the electrode. For the 60 ppi RVC RCE, the jet electrolyte flow (3.5 cm3 s?1) enhanced the mass transport rates by a factor of 1.46 at low rotation speeds; this factor was reduced to 1.08 at high rotation speeds. For a 100 ppi electrode, the enhanced mass transport decreased from 1.26 to 1.03 at low and high rotation rates, respectively. Under the experimental conditions, baffles showed little effect on the mass transport rates to the RVC RCE. Mass transport to jet flow at an RVC RCE is compared to other RCEs using dimensionless group correlation
The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications
No full textThe limitations of two-dimensional electrodes can be overcome by using three-dimensional materials having sufficient porosity and active area while offering moderate mass transport rates and a relatively low pressure drop at controlled electrolyte flow rate. In concept, a wide variety of metal, ceramic and composite materials are possible but restrictions are imposed by the need to avoid materials degradation, while maintaining adequate electrical conductivity, sufficient robustness and the possibility of facile scale-up. Despite its fragility, one of the traditional electrode materials used as a porous, three-dimensional electrode is carbon foam, particularly in the 97% vol. porous form of reticulated vitreous carbon, RVC. A time-line indicates that the history of this material dates back over 50 years to the mid-1960s, when it was primarily used as an uncoated material in small-scale, laboratory electroanalysis. Surface modification and diverse coatings have considerably extended the use of RVC. Recent applications are found in sensors and monitors, electrosynthesis, environmental processing and energy conversion. This review highlights the fundamental structure and summarises the physicochemical properties of RVC. Fluid flow through various porosity grades of the material, their active electrochemical area and rates of mass transport are quantified. The diverse applications of RVC in energy conversion, environmental treatment and electrosynthesis are illustrated by selected examples from the authors’ laboratories and others over the last 30 years. Recent research on coated RVC, energy conversion environmental remediation and sensors is highlighted. Critical areas deserving further research and development are propose
Fourth Annual Thaddeus C. Reade Lecture Series and Pastors\u27 Conference
No full textThe fourth annual Thaddeus C. Reade Lecture Series, combined with the annual Pastors\u27 Conference will be held at Taylor University Thursday, February 4. The Reade Lecturer will be Dr. A.W. Tozer, noted author an lecturer
Joseph B. Reade (1801–1870) and the earliest studies of fossil dinoflagellate cysts in England
No full textAbstract. The earliest British record of fossil dinoflagellate cysts is shown to have been published in 1838, in an appendix to Mantell’s The Wonders of Geology. A biography of its author, the Reverend Joseph Bancroft Reade (1801–1870), is presented; it is shown that his discoveries resulted from an awareness of earlier work in Germany and France. Reade is shown, not only to have stimulated Mantell’s interest in these microfossils, but also to have perceived their potential value as biostratigraphical indices. The present taxonomic placement of the forms illustrated by Reade in the 1838 note, and in his better-known paper published later in the same year, is summarized.
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Jusqu’où faut-il aller trop loin : Charles Reade, une esthétique de l’excès
No full textCharles Reade, the novelist (1814-1884), has lain in purgatory for more than one century, apparently because of his taste for excess. Rehabilitation is still to come for the author of It Is Never Too Late to Mend (1856), The Cloister and the Hearth (1861) or Hard Cash (1863), the three works which are studied in this paper. Reade never knew how to check his productivity, as exemplified by the constant recycling of his own texts and others’, his desire to shock the Victorian public with bloody episodes, or his decision to leave nothing unsaid, at the risk of crushing his readers under an excessive mass of words
Charles Reade, dramatist, novelist, journalist. A memoir compiled chiefly from his literary remains,
No full textMode of access: Internet
Secwepemctsin Children's Reader
No full textThe Secwepemctsin Children's Reader was written at the SCES Language Department on June 2, 1998 by Mona JulesNot peer reviewedChildren's reade
Six Characters in Search of an Author Flyer [2004]
No full textBy Luigi Pirandello
Directed by Richard Reade
Dimensions: 8.5 x 11
Postcard included, dimensions 5.5 x 8.5https://digitalcommons.usm.maine.edu/theatre-posters-2004-2005/1005/thumbnail.jp
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