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Saturday, April 18, 2020 | History

2 edition of Formation, Transformation and Dissolution of Phases Formed on Surfaces. found in the catalog.

Formation, Transformation and Dissolution of Phases Formed on Surfaces.

Atomic Energy of Canada Limited.

Formation, Transformation and Dissolution of Phases Formed on Surfaces.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesAtomic Energy of Canada Limited. AECL -- 6840
ContributionsShoesmith, D.
ID Numbers
Open LibraryOL21970090M

X-ray diffraction has been applied in the investigation of phase formation in steels, operating in industrial environments. In this work, identification and quantification of phases by X-ray diffraction and peak fitting, using the Rietveld method, were employed. In a first scenario, two different types of steels, subjected to abrasive surface cleaning, suffered contamination from the blasting.


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Formation, Transformation and Dissolution of Phases Formed on Surfaces. by Atomic Energy of Canada Limited. Download PDF EPUB FB2

Dissolution, Formation, and Transformation of the Lead Corrosion Product PbO2: carbonate to form corrosion scales. Dissolution experiments provided direct evidence that the PbO2 dissolution rate Predominance area diagrams showing the dominant lead solid phase or dissolved species as a function pH and oxidation-reduction potential for (a)Author: Yanjiao Xie.

The dissolution of hausmannite occurs first, and 7-å phase birnessite is then precipitated in high-concentration NaOH and KOH solution, while dilute alkaline solution facilitates the transformation of hausmannite to manganite (Cornell and Giovanoli, ).Cited by: 4.

Surface nanobubbles are stable gaseous phases in liquids that form onto solid substrates. While their existence has been confirmed, there are many open questions related to their formation and dissolution processes along with their structure and properties.

The dissolution of sulfides during bioleaching sometimes can be regarded as a reverse biomineralization process. Therefore, the research on the surface transformation and dissolution process of bornite in the presence of microorganisms can not only help improve the bioleaching kinetics of bornite and chalcopyrite, Cited by: 3.

Solution‐mediated phase transformation is the precipitation of a stable less soluble solid during dissolution of a metastable phase that arises from supersaturated conditions in solution or at the surface of the dissolving solid.

17 Solution‐mediated phase transformation of drug compounds presents a significant challenge for drug development of poorly soluble by: J. Formation, in Phase Transformations in Steels: Fundamentals and Diffusion-Controlled Transformations, Introduction.

Phase transformations in metallic microstructures are governed primarily by the free-energy difference between the parent phase and potential new phases.

The origin of the free-energy difference is primarily in the chemical and structural state of the phases. Diamond dissolution in ÑÎ 2-bearing carbonate melts also begins with the formation of positive trigons on the {} faces and development trigon-trioctahedron surfaces on the edges.

Dissolution form changes from trigon-trioctahedron to dodecahedroid with increasing loss of initial by: The model explains how a team develops over time, which consists of 4 key stages, “forming, storming, norming and performing”.

An additional stage was later added inthis stage is “adjourning”, which is used to describe the break-up of a team following project completion. Soil Formation Soils may be formed in place from rock or formed in weathered rock and minerals that have been transported from where the original rock occurred.

Rocks Consist of mixtures of minerals. Igneous Metamorphic Sedimentary Igneous rocks are formed from molten magma and contain primary minerals. Sedimentary rocks are formed by depositionFile Size: KB. Dolomite dissolution proceeded by two identified mechanisms: removal of dolomite layers through spreading and coalescence of etch pits nucleated at defect points, and stepped retreat from surface edges.

The dolomite dissolution rate increased when pH decreased (from nm s–1 at pH 3 to nm s–1 at pH 5).Cited by: 3. Calcium orthophosphates are the main mineral constituents of bones and teeth, and there is great interest in understanding the physical mechanisms that underlie their growth, dissolution Cited by: Solution‐mediated phase transformation occurs in three steps: dissolution to create a supersaturated solution followed by nucleation of less soluble phase and the growth of that phase.

dispersoids were formed upon dissolution of lathe-shaped Q-AlMgSiCu phase during homogenization of the modified AA Al alloy. It was, for the first time, observed thatAuthor: Gongwang Zhang.

The purpose of this research is to gain a greater insight into the hydrate formation processes of different carbamazepine (CBZ) anhydrate forms in aqueous suspension, where principal component analysis (PCA) was Transformation and Dissolution of Phases Formed on Surfaces.

book for data by: 8. Abstract. Many calcium oxalate renal stones consist of an inner core of monohydrate (COM) with an outer surface layer of the thermodynamically less stable dihydrate (COD) kinetic relationships between the hydrates may, therefore, be of considerable importance since these phases may form either directly or via a transformation process in the continuously changing urine by: 1.

Using a video camera, ink-jet dispenser, and precision stages, we observed that in D-NIL, although the spreading droplets can evacuate most air between the mould and the substrate, there are still bubbles trapped [7, 8].We found that the bubble formation in D-NIL is due to two different mechanisms: (1) feature pinning, where liquid resist is pinned to certain surface topography and (2 Cited by:   Partially, this volume change is the result of the difference in density between the two phases, but it is generally accepted that a dissolution–re-precipitation mechanism takes place in apatite Cited by: Under dry conditions, gas-phase CO2 readily reacts with surface hydroxyl groups present on the ZnO and CuO nanoparticle surface to form adsorbed bicarbonate, whereas the interaction of CO2 with surface defect sites and lattice oxygen gives rise to surface-adsorbed monodentate and bidentate carbonate species as well as adsorbed by:   As such, they tend to remain in a solid phase.

Whereas bulk Al is known not to be reactive with alcohols without a catalyst, Al atoms with unsatisfied bonds formed upon Li dissolution from AlLi particles are sufficiently reactive to induce formation of alkoxides.

As the Li out-diffusion and dissolution proceed from the surface of the particles Cited by:   Site Formation Processes refers to the events that created and affected an archaeological site before, during, and after its occupation by humans. To gain the best possible understanding of an archaeological site, researchers collect evidence of the natural and cultural events that happened there.

Biphasic dissolution systems achieved good predictability for the in vivo performance of several formulations of poorly water-soluble drugs by characterizing dissolution, precipitation, re-dissolution, and absorption.

To achieve a high degree of predictive performance, acceptor media, aqueous phase composition, and the apparatus type have to be carefully selected. The dissolution and precipitation of a crystalline matter in contact with a solution can be studied by measuring the progress of the crystal surface as a function of time.

Hunkeler and Bohni () and Dunn et al. () used this technique. Civan () determined that the position of the progressing crystal surface could be correlated by. (B) In late-granular cells, these droplets crowd the cytoplasm and dissolve as cells (1) undergo chromatin compaction.

(C) Near the skin surface, a sudden shift in intracellular pH regulates liquid-phase dynamics to drive squame formation.

At the body surface, skin’s stratified squamous epithelium is challenged by environmental by: 1. AA Al alloys modified with addition of Mn, Cr and Cu were homogenized at temperatures between ºC and ºC after casting.

STEM experiments revealed that the formation of α-Al(MnFeCr)Si dispersoids during homogenization were strongly affected by various factors such as heating rate, concentration of Mn, low temperature pre-nucleation treatment and homogenization : Gongwang Zhang.

We investigated the dissolution of a natural Fe-containing dolomite [CaMgFeMn(CO3)2] under acidic conditions (pH 3–) with atomic force microscopy (AFM) at 20 °C and with batch dissolution experiments at 80 °C.

Dolomite dissolution proceeded by two identified mechanisms: removal of dolomite layers through spreading and Cited by: 3. Diagenesis (/ ˌ d aɪ ə ˈ dʒ ɛ n ɪ s ɪ s /) is the process that describes physical and chemical changes in sediments caused by increasing temperature and pressure as they get buried in the Earth's crust.

In the early stages, this transformation of sediment into sedimentary rock, (lithification) is accompanied simply by a reduction in porosity, while its component mineralogy remains.

Pearlite is formed during sufficiently slow cooling in an iron-carbon system at the eutectoid point in the Fe-C phase diagram ( °C, eutectoid temperature). In a pure Fe-C alloy it contains about 88 vol.% ferrite and 12 vol.% cementite. Pearlite is known for being tough and. The simulations reveal the following qualitative picture of porosity formation.

The process starts with the dissolution of a single silver atom on a flat alloy surface of close-packed ( Cited by: The mechanism of porosityformation during solvent-mediated phase transformations C.

Raufaste,1,2 Bjørn Jamtveit,1 Timm John,1,3 Paul Meakin,1,4,5 and Dag Kristian Dysthe1 1Physics of Geological Processes (PGP), University of Oslo, P.O. BoxBlindern, N Oslo, Norway 2Laboratoire de Physique de la Mati`ere Condens´ee, Universit´e de Nice-Sophia Antipolis,Cited by: Search the world's most comprehensive index of full-text books.

My library. The formation of the secondary solids leads to a slowing of the dissolution process due to the blocking of reactive surfaces and is more effective when isostructural (e.g.

calcite) substrates react (Böttcher, a; Cubillas et al., ; Kohler et al., ). Kaolinite (/ ˈ k eɪ ə l ɪ n aɪ t /) is a clay mineral, part of the group of industrial minerals with the chemical composition Al 2 Si 2 O 5 is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6) octahedra.

Rocks that are rich in kaolinite are known as kaolin / ˈ k eɪ ə l ɪ n / or china ry: Phyllosilicates, Kaolinite-serpentine group. Clay Minerals – Journal of Fine Particle Science publishes electronically and in paper form, research papers about clays, clay minerals and related materials, natural or synthetic.

Aspects covered include: Earth Processes (interactions in 'system earth' ± soil science, and geology/mineralogy) including genesis/synthesis, phase. @article{osti_, title = {Fayalite Dissolution and Siderite Formation in Water-Saturated Supercritical CO2}, author = {Qafoku, Odeta and Kovarik, Libor and Kukkadapu, Ravi K.

and Ilton, Eugene S. and Arey, Bruce W. and Tucek, Jiri and Felmy, Andrew R.}, abstractNote = {Olivines, a significant constituent of basaltic rocks, have the potential to immobilize permanently CO2 after it is.

The mineral deposits that form when a mineral fills cracks in rocks are called veins. Figure shows white quartz veins. When the minerals are deposited in open spaces, large crystals can form. These special rocks are called geodes. Figure shows a geode that was formed when amethyst crystals grew in an open space in a rock.

Series of experiments showed the reaction time has a prominent impact on the phase and morphology transformation.

At a point of the controlling growth time, porous ZnO hollow microspheres with average diameter of 2–3 μm and hole-opening diameter of ∼ μm were obtained which exhibited a high surface area ( m 2 g −1) and a large. Formation and transformation of magnetite on two selected low-alloy structural steels were studied using cyclic and continuous water fog tests.

It is shown that continuous wetting of steel surfaces results in the formation of magnetite as the main constituent of rust formed. Solution‐mediated phase transformation occurs in three steps: dissolution to create a supersaturated solution followed by nucleation of less soluble phase and the growth of that phase.

When the growth of the less soluble phase occurs on the surface of the metastable solid, this phenomenon can cause a marked decrease in dissolution rate during.

This research concerns the precipitation and subsequent dissolution of precipitate phases in an Al–Mg–Si–Cu (at.%) alloy subjected to varying thermal exposure during an in situ heating transmission electron microscope (TEM) experiment.

The distribution and crystal structure of precipitates were determined by a scanning diffraction approach at multiple stages, pinpointing the Cited by: 1.

Description: Precipitation and Dissolution of Iron and Manganese Oxides by Scot T. Martin Division of Engineering and Applied Sciences 29 Oxford St., Pierce Hall, Room Like this book. You can publish your book online for free in a few minutes!.

Calcium Carbonate Formation and Dissolution John W. Morse *, Rolf S. Arvidson, and Andreas Lüttge Department of Oceanography, MS, Texas A&M University, College Station, Texasand Department of Earth Science MS, Rice University, Main Street, P.O.

BoxHouston, Texas Cited by:   These results suggest that anatase is formed due to the lower surface energy as compared to the other phases. The lower surface energy affects phase formation in terms of thermodynamics and kinetics.

Thermodynamically, anatase is the structure with the lowest total energy if the nanoparticles are sufficiently by: @article{osti_, title = {Numerical Modeling Studies of The Dissolution-Diffusion-Convection ProcessDuring CO2 Storage in Saline Aquifers}, author = {Pruess, Karsten and Zhang, Keni}, abstractNote = {For purposes of geologic storage, CO2 would be injected into saline formations at supercritical temperature and pressure conditions, and would form a separate phase that is .