226 results found
Georgiadis A, Berg S, Maitland G, et al., 2012, Pore-Scale Micro-CT Imaging: Cluster Size Distribution during Drainage and Imbibition, 6TH TRONDHEIM CONFERENCE ON CO2 CAPTURE, TRANSPORT AND STORAGE, Vol: 23, Pages: 521-526, ISSN: 1876-6102
Georgiadis A, Maitland G, Trusler JPM, et al., 2011, Interfacial Tension Measurements of the (H2O + n-Decane + CO2) Ternary System at Elevated Pressures and Temperatures, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 56, Pages: 4900-4908, ISSN: 0021-9568
Secuianu C, Maitland GC, Trusler JPM, et al., 2011, Mutual Diffusion Coefficients of Aqueous KCl at High Pressures Measured by the Taylor Dispersion Method, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 56, Pages: 4840-4848, ISSN: 0021-9568
Tamburic B, Zemichael FW, Maitland GC, et al., 2011, Parameters affecting the growth and hydrogen production of the green alga Chlamydomonas reinhardtii, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 36, Pages: 7872-7876, ISSN: 0360-3199
Tamburic B, Zemichael FW, Crudge P, et al., 2011, Design of a novel flat-plate photobioreactor system for green algal hydrogen production, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 36, Pages: 6578-6591, ISSN: 0360-3199
Georgiadis A, Llovell F, Bismarck A, et al., 2010, Interfacial tension measurements and modelling of (carbon dioxide plus n-alkane) and (carbon dioxide plus water) binary mixtures at elevated pressures and temperatures, JOURNAL OF SUPERCRITICAL FLUIDS, Vol: 55, Pages: 743-754, ISSN: 0896-8446
Georgiadis A, Maitland G, Trusler JPM, et al., 2010, Interfacial Tension Measurements of the (H2O + CO2) System at Elevated Pressures and Temperatures, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 55, Pages: 4168-4175, ISSN: 0021-9568
Ciotta F, Maitland G, Smietana M, et al., 2010, Viscosity and Density of Carbon Dioxide + 2,6,10,15,19,23-Hexamethyltetracosane (Squalane). (vol 54, pg 2436, 2009), JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 55, Pages: 4126-4126, ISSN: 0021-9568
Lamy C, Iglauer S, Pentland CH, et al., 2010, Capillary trapping in carbonate rocks, 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010, Vol: 2, Pages: 815-823
Carbonate reservoirs represent a possible geological storage option for carbon dioxide from anthropogenic sources. We conducted capillary trapping experiments on different carbonate rocks to assess their suitability for storage. We measured the trapped non-wetting phase saturation as a function of the initial non-wetting phase saturation and porosity. We used refined oil - with a density similar to that of supercritical CO2 - as the non-wetting phase and brine as the wetting phase. The experiments were performed at ambient temperature and slightly elevated pressures. Saturations were determined by mass and volume balance. We found that the trapped non-wetting phase saturation rises approximately linearly with initial saturation. The porosity was shown to have a significant effect on both initial saturation and residual saturation. The influence of effective stress was also investigated. It was shown that carbonates have significantly different stress behavior compared to sandstones. As the pressure of the non-wetting phase increases during primary drainage, the initial oil saturation increases to a maximum value and then decreases, as the fluid pressure affects the pore structure of the rock. © 2010, European Association of Geoscientists and Engineers.
Maitland G, 2009, Preface to the William A. Wakeham Festschrift, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 54, Pages: 2343-2346, ISSN: 0021-9568
Ciotta F, Maitland GC, Smietana M, et al., 2009, Viscosity and density of carbon dioside + 2,6,10,15,19,23-Hexamethyltetracosane (Squalane), J.Chem.Eng.Data, Vol: 54, Pages: 2436-2443
The viscosity and density of mixtures of carbon dioxide and 2,6,10,15,19,23-hexamethyltetracosane (squalane)are reported. The measurements were carried out using a vibrating wire instrument over a range oftemperatures from (303.15 to 448.15) K and at pressures ranging from approximately the minimum miscibility pressure at a given composition to 170 MPa. Pure squalane and three different mixtures, with mole fractions of CO2 of 0.423, 0.604, and 0.788, were investigated. The estimated expanded relative uncertainties of themeasurements were +/- 2 % for viscosity and +/- 0.2 % for density with a coverage factor of 2. The data for each composition were correlated by simple expressions with an absolute average relative deviation less than 2 % for viscosity and less than 0.2 % for density. The results show that the addition of CO2 to squalaneat a given pressure and temperature reduces greatly the viscosity and increases slightly the density. A hardsphere model, adjusted to fit the viscosity data of the pure substances but containing no adjustable binary parameters, was tested against the experimental data. Relative deviations bounded by approximately +/- 60% were found.
ten Brinke AJW, Bailey L, Lekkerkerker HNW, et al., 2008, Rheology modification in mixed shape colloidal dispersions. Part II: mixtures, SOFT MATTER, Vol: 4, Pages: 337-348, ISSN: 1744-683X
ten Brinke AJW, Bailey L, Lekkerkerker HNW, et al., 2007, Rheology modification in mixed shape colloidal dispersions. Part I: pure components, SOFT MATTER, Vol: 3, Pages: 1145-1162, ISSN: 1744-683X
Black L, Breen C, Yarwood J, et al., 2006, In situ Raman analysis of hydrating C(3)A and C(4)AF pastes in presence and absence of sulphate, 25th Cement and Concrete Science Conference, Publisher: MANEY PUBLISHING, Pages: 209-216, ISSN: 1743-6753
Vladu CM, Hall C, Maitland GC, 2006, Flow properties of freshly prepared ettringite suspensions in water at LE 25 degrees C, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 294, Pages: 466-472, ISSN: 0021-9797
Black L, Breen C, Yarwood J, et al., 2006, Hydration of tricalcium aluminate (C3A) in the presence and absence of gypsum - studied by Raman spectroscopy and X-ray diffraction, Journal of Materials Chemistry, Vol: 16, Pages: 1263-1372, ISSN: 0959-9428
Colston SL, Barnes P, Jupe AC, et al., 2005, An in situ synchrotron energy-dispersive diffraction study of the hydration of oilwell cement systems under high temperature/autoclave conditions up to 130 degrees C, CEMENT AND CONCRETE RESEARCH, Vol: 35, Pages: 2223-2232, ISSN: 0008-8846
Briscoe BB, Cann PM, Delfino A, et al., 2005, Lubrication with water-based clay suspensions, Proceedings of the World Tribology Congress III - 2005, Pages: 529-530
The lubricating behaviour of a water-based rock drilling fluid (bentonite clay suspension) has been studied in a simple tribometer. Friction measurements were carried out with a model contact formed between a rotating shaft and a loaded planar counterface. The experiments were designed to investigate the tribology of the contact between the drillstring and the metal wall of an oilwell. Friction measurements were made for a range of loads and contact velocities and clay concentrations. The results are presented in the form of classical Stribeck-Hersey curves in order to identify the lubrication regime and to illustrate the combined effects of load and speed on the friction coefficient. Optical interferometry experiments were also carried out, using a ball-on-disc apparatus, in order to visualise the flow of the suspension through the contact. In a separate series of tests the interfacial shear stress of the mud formulations was measured for different contact metallurgies and operating conditions. Two basic lubrication regimes are identified: at high loads a regime characterised by the deposition of layers of solid clay onto the contacting surfaces and at low loads, a regime in which the main lubricating action is provided by the base fluid. In the transition between the two regimes, an intermediate region is characterised by changes in the fluid composition and rheology within the contact. The general trend of the Stribeck curve is obtained and a peculiar scattering of the data is evident in the region between the boundary lubrication regime and the mixed lubrication regime. The intrinsic nature and the complex rheology of the fluid appear to be the parameters that may control this effect and in part define the lubrication regime. Copyright © 2005 by ASME.
Davidson S, Maitland G, 2005, Process technologies: Pipe-dream meets reality, Chemical Engineer, Pages: 40-41, ISSN: 0302-0797
The research effort launched by Energy Futures Laboratory spans many types of power generation, including renewables like solar, wind, and waves; the decommissioning of the current generation of nuclear reactors and safe handling and storage of their wastes, and the design and construction of their possible replacements; the various types of biomass and strategies for extracting more of the energy content of crops; and the hydrogen economy, and how it will affect power grids. Geoffrey Maitland, professor of energy engineering at the Energy Futures Laboratory, is setting up collaboration with other researchers to tackle the problems of recovery and utilization of hydrocarbons. The first stage is to use modern sensors and instrumentation systems to see what is happening inside oil and gas wells. This basically amounts to using technology, which is well established in chemical plants - especially petrochemicals - and applying it in a much less ordered, and more arduous environment. Current research on process intensification systems is producing compact equipment, such as reactive distillation columns and combined heat exchanger/reactors, which can perform the functions of several pieces of conventional chemical engineering equipment within a very confined space. Such equipment can be used within the pipelines that bring the oil to the surface. The most extreme example of this is the processes done in refineries, according to Maitland. Other aspects of the technology will also require a multidisciplinary approach, particularly the concept of carbon capture and storage.
Peleties F, Martin Trusler JP, Goodwin ARH, et al., 2005, Circulating pump for high-pressure and high-temperature applications, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 76, ISSN: 0034-6748
Croce V, Cosgrove T, Dreiss CA, et al., 2005, Giant micellar worms under shear: A rheological study using SANS, LANGMUIR, Vol: 21, Pages: 6762-6768, ISSN: 0743-7463
Maitland G, 2005, Transforming 'formulation': systematic soft materials design, SOFT MATTER, Vol: 1, Pages: 93-94, ISSN: 1744-683X
Couillet I, Hughes T, Maitland G, et al., 2005, Synergistic effects in aqueous solutions of mixed wormlike micelles and hydrophobically modified polymers, MACROMOLECULES, Vol: 38, Pages: 5271-5282, ISSN: 0024-9297
Patel BH, Docherty H, Varga S, et al., 2005, Generalized equation of state for square-well potentials of variable range, MOLECULAR PHYSICS, Vol: 103, Pages: 129-139, ISSN: 0026-8976
Croce V, Cosgrove T, Dreiss CA, et al., 2004, Mixed spherical and wormlike micelles: A contrast-matching study by small-angle neutron scattering, Langmuir, Vol: 20, Pages: 9978-9982, ISSN: 0743-7463
Small-angle neutron scattering studies were used to investigate the effect of adding an alcohol ethoxylate nonionic surfactant (d-C12E 20) to aqueous solutions of a cationic surfactant, erucyl bis(hydroxyethyl) methylammonium chloride (EHAC), with and without salt (KCl). The systematic use of contrast-matching, by alternately highlighting or hiding one of the surfactants, confirms that mixed micelles are formed. In salt-free solutions, mixed spherical micelles are formed and a core-shell model combined with a Hayter-Penfold potential was used to describe the data. The core radius is dominated by the EHAC tails and the outer radius determined by the ethoxylate headgroups of the nonionic surfactant. Addition of KCl promotes micellar growth; however, results of varying the solvent contrast revealed that when the nonionic surfactant is incorporated into the wormlike structure micellar breaking is promoted. Thus, mixed wormlike micelles with shorter contour lengths compared to the pure EHAC worms are formed.
Croce V, Cosgrove T, Dreiss CA, 2004, Mixed spherical and wormlike micelles: A contrast-matching study by small-angle neutron scattering, LANGMUIR, Vol: 20, Pages: 9978-9982, ISSN: 0743-7463
Couillet I, Hughes T, Maitland G, et al., 2004, Growth and scission energy of wormlike micelles formed by a cationic surfactant with long unsaturated tails, LANGMUIR, Vol: 20, Pages: 9541-9550, ISSN: 0743-7463
Croce V, Cosgrove T, Dreiss CA, et al., 2004, Impacting the length of wormlike micelles using mixed surfactant systems, LANGMUIR, Vol: 20, Pages: 7984-7990, ISSN: 0743-7463
Croce V, Cosgrove T, Maitland G, et al., 2004, Erratum: Rheology, Cryogenic Transmission Electron Spectroscopy, and Small-Angle Neutron Scattering of Highly Viscoelastic Wormlike Micellar Solutions (Langmuir (2003) 19 (8536-8541)), Langmuir, Vol: 20, ISSN: 0743-7463
Croce V, Cosgrove T, Maitland G, et al., 2004, Rheology, cryogenic transmission electron spectroscopy, and small-angle neutron scattering of highly viscoelastic wormlike micellar solutions (vol 19, pg 8536, 2003), LANGMUIR, Vol: 20, Pages: 277-277, ISSN: 0743-7463
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