232 results found
Tamburic B, Zemichael FW, Maitland GC, et al., 2012, Effect of the light regime and phototrophic conditions on growth of the H-2-producing green alga Chlamydomonas reinhardtii, 19th World Hydrogen Energy Conference (WHEC), Publisher: Elsevier, Pages: 710-719, ISSN: 1876-6102
Development of the capacity to produce hydrogen economically from renewable energy resources is of critical importance to the future viability of that fuel. The inexpensive and widely available green alga Chlamydomonas reinhardtii has the ability to photosynthetically synthesise molecular hydrogen. Green algal hydrogen production does not generate any toxic or polluting bi-products and could potentially offer value-added products derived from algal biomass. The growth of dense and healthy algal biomass is a vital requirement for efficient hydrogen production. Algal cell density is principally limited by the illumination conditions of the algal culture and by the availability of key nutrients, including the sources of carbon, nitrogen, sulphur and phosphorus. In this study, the effect of different light regimes and carbon dioxide feeds on Chlamydomonas reinhardtii growth were investigated. The objective was to increasing the algal growth rate and the cell density, leading to enhanced biohydrogen production. State-of-the art photobioreactors were used to grow algal cultures, and to measure the pH and optical density of those cultures. Under mixotrophic growth conditions, using both acetate and carbon dioxide, increasing the carbon dioxide feed rate increased the optical density of the culture but reduced the growth rate. Under autotrophic growth conditions, with carbon dioxide as the only carbon source, a carbon dioxide feed with a partial pressure of circa 11% was determined to optimise both the algal growth rate and the optical density.
Maitland G, 2012, Cold wars, CHEMISTRY & INDUSTRY, Vol: 76, Pages: 16-17, ISSN: 0009-3068
Tamburic B, Zemichael FW, Maitland GC, et al., 2012, A novel nutrient control method to deprive green algae of sulphur and initiate spontaneous hydrogen production, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 37, Pages: 8988-9001, ISSN: 0360-3199
Li X, Boek ES, Maitland GC, et al., 2012, Interfacial Tension of (Brines+CO2): CaCl2(aq), MgCl2(aq), and Na2SO4(aq) at Temperatures between (343 and 423) K, Pressures between (2 and 50) MPa, and Molalities of (0.5 to 5) mol.kg-1, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 57, Pages: 1369-1375, ISSN: 0021-9568
Li X, Boek E, Maitland GC, et al., 2012, Interfacial Tension of (Brines + CO2): (0.864 NaCl+0.136 KCl) at Temperatures between (298 and 448) K, Pressures between (2 and 50) MPa, and Total Molalities of (1 to 5) mol.kg(-1), JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 57, Pages: 1078-1088, ISSN: 0021-9568
Al Ghafri S, Maitland GC, Trusler JPM, 2012, Densities of Aqueous MgCl2(aq), CaCl2(aq), KI(aq), NaCl(aq), KCl(aq), AlCl3(aq), and (0.964 NaCl+00136 KCl)(aq) at Temperatures Between (283 and 472) K, Pressures up to 68.5 MPa, and Molalities up to 6 mol.kg(-1), JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 57, Pages: 1288-1304, ISSN: 0021-9568
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
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
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.
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.