Articles de revues : « Dissolution mechanisms »

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Hunek, Balazs, et E. L. Cussler. « Mechanisms of photoresist dissolution ». AIChE Journal 48, n^o 4 (avril 2002) : 661–72. http://dx.doi.org/10.1002/aic.690480403.

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Miller, J. L., A. S. Elwood Madden, C. M. Phillips-Lander, B. N. Pritchett et M. E. Elwood Madden. « Alunite dissolution rates : Dissolution mechanisms and implications for Mars ». Geochimica et Cosmochimica Acta 172 (janvier 2016) : 93–106. http://dx.doi.org/10.1016/j.gca.2015.10.001.

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Subhas, Adam V., Jess F. Adkins, Nick E. Rollins, John Naviaux, Jonathan Erez et William M. Berelson. « Catalysis and chemical mechanisms of calcite dissolution in seawater ». Proceedings of the National Academy of Sciences 114, n^o 31 (18 juillet 2017) : 8175–80. http://dx.doi.org/10.1073/pnas.1703604114.

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Near-equilibrium calcite dissolution in seawater contributes significantly to the regulation of atmospheric CO2 on 1,000-y timescales. Despite many studies on far-from-equilibrium dissolution, little is known about the detailed mechanisms responsible for calcite dissolution in seawater. In this paper, we dissolve 13C-labeled calcites in natural seawater. We show that the time-evolving enrichment of 𝜹13C in solution is a direct measure of both dissolution and precipitation reactions across a large range of saturation states. Secondary Ion Mass Spectrometer profiles into the 13C-labeled solids confirm the presence of precipitated material even in undersaturated conditions. The close balance of precipitation and dissolution near equilibrium can alter the chemical composition of calcite deeper than one monolayer into the crystal. This balance of dissolution–precipitation shifts significantly toward a dissolution-dominated mechanism below about Ω= 0.7. Finally, we show that the enzyme carbonic anhydrase (CA) increases the dissolution rate across all saturation states, and the effect is most pronounced close to equilibrium. This finding suggests that the rate of hydration of CO2 is a rate-limiting step for calcite dissolution in seawater. We then interpret our dissolution data in a framework that incorporates both solution chemistry and geometric constraints on the calcite solid. Near equilibrium, this framework demonstrates a lowered free energy barrier at the solid–solution interface in the presence of CA. This framework also indicates a significant change in dissolution mechanism at Ω= 0.7, which we interpret as the onset of homogeneous etch pit nucleation.

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Barkatt, Aaron, Barbara C. Gibson, Pedro B. Macedo, Charles J. Montrose, William Sousanpour, Alisa Barkatt, Morad-Ali Boroomand, Victor Rogers et Miguel Penafiel. « Mechanisms of Defense Waste Glass Dissolution ». Nuclear Technology 73, n^o 2 (mai 1986) : 140–64. http://dx.doi.org/10.13182/nt86-a33780.

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Liu, J. C., E. L. Tan et Y. W. Chien. « Dissolution Kinetics and Rate-Controlling Mechanisms ». Drug Development and Industrial Pharmacy 12, n^o 8-9 (janvier 1986) : 1357–70. http://dx.doi.org/10.3109/03639048609065864.

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Park, Kinam. « Dissolution mechanisms of felodipine solid dispersions ». Journal of Controlled Release 188 (août 2014) : 101. http://dx.doi.org/10.1016/j.jconrel.2014.07.036.

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Lohrengel, M. M., K. P. Rataj et T. Münninghoff. « Electrochemical Machining—mechanisms of anodic dissolution ». Electrochimica Acta 201 (mai 2016) : 348–53. http://dx.doi.org/10.1016/j.electacta.2015.12.219.

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Koshiba, Mitsunobu, Makoto Murata, Yoshiyuki Harita et Tsuguo Yamaoka. « Dissolution inhibition mechanisms of naphthoquinone diazides ». Polymer Engineering and Science 29, n^o 14 (août 1989) : 916–19. http://dx.doi.org/10.1002/pen.760291407.

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Kittsteiner, Thomas, Axel Ockenfels et Nadja Trhal. « Partnership dissolution mechanisms in the laboratory ». Economics Letters 117, n^o 2 (novembre 2012) : 394–96. http://dx.doi.org/10.1016/j.econlet.2012.04.084.

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Zuo, Yibing, et Guang Ye. « Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag ». Materials 13, n^o 21 (27 octobre 2020) : 4796. http://dx.doi.org/10.3390/ma13214796.

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Many calorimetric studies have been carried out to investigate the reaction process of alkali-activated slag paste. However, the origin of the induction period and action mechanism of soluble Si in the dissolution of slag are still not clear. Moreover, the mechanisms behind different reaction periods are not well described. In this study, the reaction kinetics of alkali-activated slag paste was monitored by isothermal calorimetry and the effect of soluble Si was investigated through a dissolution test. The results showed that occurrence of the induction period in hydration of alkali-activated slag paste depended on the presence of soluble Si in alkaline activator and the soluble Si slowed down the dissolution of slag. A dissolution theory-based mechanism was introduced and applied to the dissolution of slag, showing good interpretation of the action mechanism of soluble Si. With this dissolution theory-based mechanism, origin of the induction period in hydration of alkali-activated slag was explicitly interpreted.

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Yang, Y. F., H. Y. Wang, J. G. Wang, R. Y. Zhao et Q. C. Jiang. « Ignition and reaction mechanisms of thermal explosion reaction in the Ni-Ti-C system under air and Ar ». Journal of Materials Research 24, n^o 10 (octobre 2009) : 3197–205. http://dx.doi.org/10.1557/jmr.2009.0370.

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The ignition and reaction mechanisms of the thermal explosion reaction in the Ni-Ti-C system under air and Ar conditions were investigated. The reaction for the formation of TiC can be initiated at a low temperature under air. The ignition temperature under air is much lower than that under Ar. Under Ar, both the ignition and reaction mechanisms consist of dissolution, reaction, and precipitation. Under air, the ignition mechanism is confirmed to be the chemical oven mechanism, and the reaction mechanism is dissolution, reaction, and precipitation. The mechanism of gas transport plays a much more minor role in the ignition and reaction processes under air.

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Vehmaanperä, Paula, Tuomas Sihvonen, Riina Salmimies et Antti Häkkinen. « Dissolution of Magnetite and Hematite in Mixtures of Oxalic and Nitric Acid : Mechanisms and Kinetics ». Minerals 12, n^o 5 (29 avril 2022) : 560. http://dx.doi.org/10.3390/min12050560.

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Dissolution mechanisms and kinetics have a key role in better understanding of processes. In this work, magnetite and hematite powder were dissolved in oxalic and nitric acid mixtures at different temperatures. Higher temperature and higher amounts of oxalic acid in the system accelerated the dissolution kinetics but did not result in higher solubility levels. Oxalic acid had also drawbacks in the process since higher amounts in the system promoted formation of a solid product, humboldtine (Fe(II)C2O4∙2H2O), which, in turn, inhibited the dissolution. This problem may be overcome by adding even a small amount of nitric acid to the system. Kinetic analysis showed, in the variable-rate-controlling step, that two linear fits of the Kabai model described the dissolution better in an oxalic acid and acid mixture of 70/30. Thermodynamic data and special cubic models showed that the nitric acid concentration had a significant role in the solubility, whereas the concentration of oxalic acid had only minor effects on solubility. The results also showed that measuring the oxalate and nitrate concentrations did not provide additional information about the dissolution mechanism itself. The pH, however, might be a tool for following the extent of dissolution, even though it is not a direct indicator of the dissolution mechanism.

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Cuadros, J. « Clay crystal-chemical adaptability and transformation mechanisms ». Clay Minerals 47, n^o 2 (juin 2012) : 147–64. http://dx.doi.org/10.1180/claymin.2012.047.2.01.

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AbstractChemical and mineralogical transformations of phyllosilicates are among the most important in diagenetic environments in all types of rocks because they can exert a large control on the processes taking place in such environments and/or provide constraints for the conditions in which phyllosilicate transformation occurred. Dissolution-precipitation and solid-state transformation are usually the two mechanisms proposed for such reactions depending on the crystal-chemical and morphological similarities between parent and neoformed phases together with knowledge of the environmental conditions. These two mechanisms, however, may be at both ends of the spectrum of those operating and many transformations may take place through a mixture of the two mechanisms, generating observable elements that are characteristic of one or the other. In the present literature, the boundaries between the two mechanisms are not clear, mainly because dissolution-precipitation is sometimes defined at nearly atomic scale. It is proposed here that such small-scale processes are considered as a solid-state transformation, and that dissolution-precipitation requires dissolution of entire mineral particles and their dissolved species to pass into the bulk of the solution. Understanding the reaction mechanisms of diagenetic transformations is an important issue because they impinge on geochemical conditions and variables such as cation mobility, rock volume, fabric changes, rock permeability, stable isotope signature and phyllosilicate crystal-chemistry.I propose that, in the lower range temperatures at which clay mineral transformations take place, energy considerations favour solid-state transformation, or reactions that involve the breaking of a limited number of bonds, over dissolution of entire grains and precipitation of crystals of the new phase. Large morphological changes are frequently invoked as evidence for a dissolution-precipitation mechanism but changes in particle shape and size may be achieved by particle rupture, particle welding or by hybrid processes in which dissolution-precipitation plays a minor role.Past and recent studies of phyllosilicate transformations show chemical and structural intermediates indicating a large crystal-chemical versatility, greater than is commonly recognized. These intermediates include tetrahedral sheets of different composition within TOT units (termed polar layers), dioctahedral and trioctahedral domains in the same layer, and 2:1 and 1:1 domains also within the same layers. The existence of such intermediate structures suggests that the reaction mechanisms that generated them are within the realm of the solid-state transformation processes.

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Anderson, Neil L., et Ralph Knapp. « An overview of some of the large scale mechanisms of salt dissolution in western Canada ». GEOPHYSICS 58, n^o 9 (septembre 1993) : 1375–87. http://dx.doi.org/10.1190/1.1443520.

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Well log and seismic data indicate that the bedded rock salts (salts) of the Devonian Age Prairie Formation were widely distributed and uniformly deposited in the Lloydminster area, Western Canada (T45-65, R20W3M-R5W4M); however, as a result of extensive leaching, the distribution of these salts is not now what it once was. The Lloydminster area is now bisected by the north‐south trending main dissolutional edge of the Prairie salt. Thick salt (up to 150 m) is preserved to the west of this edge; to the east the salt is mostly absent. Analyses of remnant salt and patterns of subsurface structural relief suggests that the dissolution of the Prairie salt in the Lloydminster area was triggered and/or accentuated in part by several different large scale mechanisms including: near‐surface exposure, centripetal flow of unsaturated waters, regional faulting/fracturing, glacial loading and/or unloading, dissolution of the underlying salt, and salt creep. These mechanisms are supported by the incorporated seismic and well log control that indicate a direct relationship between the thicknesses of remnant salt and post‐salt strata. Well log and seismic data also indicate that the bedded salts of the Devonian Age Black Creek Member were uniformly deposited within the Black Creek sub‐basin, Rainbow Lake area, western Canada (T105-112, R5-R10W6M); however, as a result of extensive leaching, distribution of these salts is not now what it once was. The Black Creek salts are now preserved only as discontinuous remnants with maximum gross thicknesses on the order of 80 m. Seismic and well log control suggests that the dissolution of the Black Creek salt in the Rainbow Lake study area was triggered and/or accentuated in part by several different large scale mechanisms including: centrifugal flow of unsaturated waters, regional faulting/fracturing and salt creep. Bedded salt is preserved within five other Devonian Age evaporitic units in Alberta, Canada: the Lotsberg Formation, Cold Lake Formation, Beaverhill Lake Group, Leduc Formation, and Wabamun Group. Each of these salts has also been extensively leached in places. In the literature, dissolution is generally attributed to one or more of the previously noted large scale mechanisms. Herein we present an overview of the envisioned principal mechanisms of salt dissolution. In support of these hypothesized mechanisms, we present seismic and geologic control from both the Lloydminster and Rainbow Lake areas of western Canada, which illustrate that the dissolution of subsurface salts is accompanied by the subsidence of post‐salt strata and that the analyses of this information can be used to elucidate the timing and large scale mechanisms of salt dissolution.

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Duan, Zhiyao, et Graeme Henkelman. « Atomic-Scale Mechanisms of Electrochemical Pt Dissolution ». ACS Catalysis 11, n^o 23 (16 novembre 2021) : 14439–47. http://dx.doi.org/10.1021/acscatal.1c02366.

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Casey, William H., Henry R. Westrich et George W. Arnold. « Mechanisms of feldspar dissolution in acid solutions ». Chemical Geology 70, n^o 1-2 (août 1988) : 77. http://dx.doi.org/10.1016/0009-2541(88)90414-7.

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Tsuru, Tooru. « Anodic dissolution mechanisms of metals and alloys ». Materials Science and Engineering : A 146, n^o 1-2 (octobre 1991) : 1–14. http://dx.doi.org/10.1016/0921-5093(91)90264-n.

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Zhang, Li, et Andreas Lüttge. « Theoretical approach to evaluating plagioclase dissolution mechanisms ». Geochimica et Cosmochimica Acta 73, n^o 10 (mai 2009) : 2832–49. http://dx.doi.org/10.1016/j.gca.2009.02.021.

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Justen, Anna, Gerhard Schaldach et Markus Thommes. « Insights into the Mechanism of Enhanced Dissolution in Solid Crystalline Formulations ». Pharmaceutics 16, n^o 4 (7 avril 2024) : 510. http://dx.doi.org/10.3390/pharmaceutics16040510.

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Solid dispersions are a promising approach to enhance the dissolution of poorly water-soluble drugs. Solid crystalline formulations show a fast drug dissolution and a high thermodynamic stability. To understand the mechanisms leading to the faster dissolution of solid crystalline formulations, physical mixtures of the poorly soluble drugs celecoxib, naproxen and phenytoin were investigated in the flow through cell (apparatus 4). The effect of drug load, hydrodynamics in the flow through cell and particle size reduction in co-milled physical mixtures were studied. A carrier- and drug-enabled dissolution could be distinguished. Below a certain drug load, the limit of drug load, carrier-enabled dissolution occurred, and above this value, the drug defined the dissolution rate. For a carrier-enabled behavior, the dissolution kinetics can be divided into a first fast phase, a second slow phase and a transition phase in between. This study contributes to the understanding of the dissolution mechanism in solid crystalline formulations and is thereby valuable for the process and formulation development.

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Yu, Kan, Yanling Zhang, Shuai Zhang et Ming Gao. « Effects of Al2O3/TiO2/Na2O on Lime Dissolution in Steelmaking Slag ». Metals 13, n^o 2 (20 janvier 2023) : 209. http://dx.doi.org/10.3390/met13020209.

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The mechanism of lime dissolution in steelmaking slag and the factors that influence the dissolution rate are highly significant in improving the efficiency of the steelmaking process; however, they are yet to be fully understood. Here, the effects of Al2O3/TiO2/Na2O additives on the dissolution rate of lime and the composition of molten slag were investigated using a rotating cylinder technique. The results indicate that the promotion coefficients at 1400 °C decrease in the order of Na2O > TiO2 > Al2O3. Furthermore, the CaO dissolution rate and kinetic parameters were calculated, and the lime dissolution mechanisms in the presence or absence of Al2O3, TiO2, and Na2O were compared. Additionally, the data show that ATN (a mixture with a mass ratio of Al2O3:TiO2:Na2O = 15:4:3) can be used as a suitable flux in the steelmaking process.

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Zheng, Lifan, Junjie Wang, Kefei Li, Mingyu Wang, Shimeng Li et Lin Yuan. « Advances in the Experiments of Leaching in Cement-Based Materials and Dissolution in Rocks ». Materials 16, n^o 24 (18 décembre 2023) : 7697. http://dx.doi.org/10.3390/ma16247697.

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Leaching in cement-based materials and dissolution in rocks are important problems in civil engineering. In the past century, concrete damage caused by leaching have occurred worldwide. And, rock dissolution is usually the main cause of karst rock erosions. This paper provides a review of the causes, influencing factors, and effects on engineering properties of dissolution of rocks and leaching of cement-based materials. The applied experimental methods for leaching and dissolution have been sorted out and discussed. In situ field experiments can be used to study dissolution under natural conditions, while the laboratory experiments can effectively shorten the experiment time length (by changing pH, temperature, pressure or other factors that affect the leaching or dissolution) to quickly investigate the mechanism of dissolution and leaching. Micro tests including XRD, SEM, EDS, and other testing methods can obtain the changes in material properties and microstructures under leaching and dissolution. In addition, with the advances in technologies and updated instruments, more and more new testing methods are being used. The factors affecting the leaching and dissolution include environmental factors, materials, and solvent parameters. The mechanisms and deterioration processes of leaching and dissolution varies according to the types of material and the compositions.

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Ossowska, Agnieszka, et Andrzej Zieliński. « The Mechanisms of Degradation of Titanium Dental Implants ». Coatings 10, n^o 9 (28 août 2020) : 836. http://dx.doi.org/10.3390/coatings10090836.

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Titanium dental implants show very good properties, unfortunately there are still issues regarding material wear due to corrosion, implant loosening, as well as biological factors—allergic reactions and inflammation leading to rejection of the implanted material. In order to avoid performing reimplantation operations, changes in the chemical composition and/or modifications of the surface layer of the materials are used. This research is aimed at explaining the possible mechanisms of titanium dissolution and the role of oxide coating, and its damage, in the enhancement of the corrosion process. The studies of new and used implants were made by scanning electron microscopy and computer tomography. The long-term chemical dissolution of rutile was studied in Ringer’s solution and artificial saliva at various pH levels and room temperature. Inductively coupled plasma mass spectrometry (ICP-MS) conjugated plasma ion spectrometry was used to determine the number of dissolved titanium ions in the solutions. The obtained results demonstrated the extremely low dissolution rate of rutile, slightly increasing along with pH. The diffusion calculations showed that the diffusion of titanium through the oxide layer at human body temperature is negligible. The obtained results indicate that the surface damage followed by titanium dissolution is initiated at the defects caused by either the manufacturing process or implantation surgery. At a low thickness of titanium oxide coating, there is a stepwise appearance and development of cracks that forms corrosion tunnels within the oxide coating.

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Pan, Bochen, Rui Shen, Zhe Guan, Leping Dang et Hongyuan Wei. « Insights into the dissolution mechanisms of detergent agglomerates : An approach to assess dissolution heterogeneity ». Advanced Powder Technology 28, n^o 10 (octobre 2017) : 2658–64. http://dx.doi.org/10.1016/j.apt.2017.07.018.

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Rajesh, John Anthuvan, et Arumugam Pandurangan. « Lanthanum nickel alloy catalyzed growth of nitrogen-doped carbon nanotubes by chemical vapor deposition ». RSC Adv. 4, n^o 39 (2014) : 20554–66. http://dx.doi.org/10.1039/c4ra02321h.

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Stoliker, Devon, Gary F. Egan, Karl J. Friston et Adeel Razi. « Neural Mechanisms and Psychology of Psychedelic Ego Dissolution ». Pharmacological Reviews 74, n^o 4 (9 septembre 2022) : 874–915. http://dx.doi.org/10.1124/pharmrev.121.000508.

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Chou, L., et R. Wollast. « Steady-state kinetics and dissolution mechanisms of albite ». American Journal of Science 285, n^o 10 (1 décembre 1985) : 963–93. http://dx.doi.org/10.2475/ajs.285.10.963.

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NG, Felix, et Bernard Hallet. « Patterning mechanisms in subglacial carbonate dissolution and deposition ». Journal of Glaciology 48, n^o 162 (2002) : 386–400. http://dx.doi.org/10.3189/172756502781831214.

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AbstractDeglaciated bedrock surfaces in limestone areas often exhibit extensive patterning by solutional furrows and carbonate deposits that occur in close association with undulations in the bed topography. These features clearly result from subglacial dissolution and precipitation of calcite on the bed — induced, for instance, by melting and freezing in a regelation water film — but little is known about the observed morphology. In particular, it is intriguing that (i) the solutional furrows, whose formation requires explanation, are collectively organized into arcuate patterns, with characteristic spacing, and (ii) a fluted or “spiculed” surface texture is ubiquitous on the calcite deposits. Herein, we propose specific mechanisms for such patterning based on a theory where chemical processes in the water film are coupled to regelation physics. Solutional furrows reflect locally enhanced dissolution along stoss surfaces, where CO2-rich bubbles advected in the ice from up-glacier come into contact with the bed. The bubbles form as CO2 is exsolved from freezing film water at the lee of bed bumps. The flutings on the deposit are inherently the manifestation of a spatial instability at the interface where calcite precipitation occurs. Complex interactions underlie some of the striking glacier-bed features shaped by subglacial chemical processes.

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Corrigan, Owen I. « Mechanisms of Dissolution of Fast Release Solid Dispersions ». Drug Development and Industrial Pharmacy 11, n^o 2-3 (janvier 1985) : 697–724. http://dx.doi.org/10.3109/03639048509056896.

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Simpson, Darren J., Thomas Bredow, Roger St C. Smart et Andrea R. Gerson. « Mechanisms of acidic dissolution at the MgO() surface ». Surface Science 516, n^o 1-2 (septembre 2002) : 134–46. http://dx.doi.org/10.1016/s0039-6028(02)01977-5.

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Malengreau, Nathalie, et Garrison Sposito. « Short-time dissolution mechanisms of kaolinitic tropical soils ». Geochimica et Cosmochimica Acta 61, n^o 20 (octobre 1997) : 4297–307. http://dx.doi.org/10.1016/s0016-7037(97)00211-1.

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Gunarathne, Viraj, Anushka Upamali Rajapaksha, Meththika Vithanage, Nadeesh Adassooriya, Asitha Cooray, Sudantha Liyanage, Bandunee Athapattu et al. « Heavy metal dissolution mechanisms from electrical industrial sludge ». Science of The Total Environment 696 (décembre 2019) : 133922. http://dx.doi.org/10.1016/j.scitotenv.2019.133922.

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Colman, Robert W. « Chapter 3 Mechanisms of thrombus formation and dissolution ». Cardiovascular Pathology 2, n^o 3 (juillet 1993) : 23–31. http://dx.doi.org/10.1016/1054-8807(93)90044-3.

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Doherty, C., et P. York. « Mechanisms of dissolution of frusemide/PVP solid dispersions ». International Journal of Pharmaceutics 34, n^o 3 (janvier 1987) : 197–205. http://dx.doi.org/10.1016/0378-5173(87)90180-3.

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Matsuura, Hiroyuki, Xiaorui Zhang, Likun Zang, Guohua Zhang et Fumitaka Tsukihashi. « Dissolution mechanisms of steelmaking slags in sea water ». Mineral Processing and Extractive Metallurgy 126, n^o 1-2 (14 décembre 2016) : 11–21. http://dx.doi.org/10.1080/03719553.2016.1263784.

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Reinoso-Maset, Estela, Carl I. Steefel, Wooyong Um, Jon Chorover et Peggy A. O'Day. « Rates and mechanisms of uranyl oxyhydroxide mineral dissolution ». Geochimica et Cosmochimica Acta 207 (juin 2017) : 298–321. http://dx.doi.org/10.1016/j.gca.2017.03.009.

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Školáková, Tereza, Michaela Slámová, Andrea Školáková, Alena Kadeřábková, Jan Patera et Petr Zámostný. « Investigation of Dissolution Mechanism and Release Kinetics of Poorly Water-Soluble Tadalafil from Amorphous Solid Dispersions Prepared by Various Methods ». Pharmaceutics 11, n^o 8 (2 août 2019) : 383. http://dx.doi.org/10.3390/pharmaceutics11080383.

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The aims of this study were to investigate how the release of tadalafil is influenced by two grades of polyvinylpyrrolidone (Kollidon® 12 PF and Kollidon® VA 64) and various methods of preparing solid dispersions (solvent evaporation, spray drying and hot-melt extrusion). Tadalafil is poorly water-soluble and its high melting point makes it very sensitive to the solid dispersion preparation method. Therefore, the objectives were to make a comparative evaluation among different solid dispersions and to assess the effect of the physicochemical nature of solid dispersions on the drug release profile with respect to the erosion-diffusion mechanism. The solid dispersions were evaluated for dissolution profiles, XRD, SEM, FT-IR, DSC, and solubility or stability studies. It was found that tadalafil release was influenced by polymer molecular weight. Therefore, solid dispersions containing Kollidon® 12 PF showed a faster dissolution rate compared to Kollidon® VA 64. Tadalafil was released from solid dispersions containing Kollidon® 12 PF because of the combination of erosion and diffusion mechanisms. The diffusion mechanisms were predominant in the initial phase of the experiment and the slow erosion was dissolution-controlling at the second stage of the dissolution. On the contrary, the tadalafil release rate from solid dispersions containing Kollidon® VA 64 was controlled solely by the erosion mechanism.

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Juilland, Patrick, Luc Nicoleau, Rolf S. Arvidson et Emmanuel Gallucci. « Advances in dissolution understanding and their implications for cement hydration ». RILEM Technical Letters 2 (30 décembre 2017) : 90–98. http://dx.doi.org/10.21809/rilemtechlett.2017.47.

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Recent advances in bridging kinetics and thermodynamics of mineral dissolution have opened new horizons in our understanding of the role of dissolution in cement hydration. Indeed most hydration kinetic regimes of alite can be rationally envisioned from a dissolution perspective. This short note reviews some key findings on dissolution mechanisms and their implication for cementitious systems.

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Huang, Kevin. « Performance of Several Excellent Oxide-Based Intercalation Cathodes for Aqueous Zn-Ion Batteries ». ECS Meeting Abstracts MA2023-01, n^o 5 (28 août 2023) : 921. http://dx.doi.org/10.1149/ma2023-015921mtgabs.

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Aqueous Zn-ion batteries (ZIBs) have garnered significant interest in recent years due to their advantages in safety, cost, and energy density, which make them suitable for large-scale stationary energy storage. Cathode materials have been a primary research focus in the early stage of ZIBs development since they are widely deemed a limiting factor to the performance. In general, good ZIB cathode materials are found in oxides with layered and open framework structures, and inorganic/organic hybrids, and follow mechanisms of “intercalation”, “conversion” or a combination of both to store Zn2+ and H+ during discharge. However, dissolution of these cathodes into aqueous electrolytes has been a major cause of the performance degradation of aqueous ZIBs. In this presentation, we first show our fundamental understanding of cathode dissolution mechanisms and development of engineering solutions to address the dissolution and instability issues. We then show through several examples how specially engineered V-oxides based cathodes achieve better dissolution resistance and performance stability using aqueous Zn(OTf)2 and ZnSO4 electrolytes as examples. We expect that the insights in this presentation will advance the understanding of dissolution mechanisms and provide design principles for better cathode materials.

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Solis-Bravo, Gregorio, Matthew Merwin et C. Isaac Garcia. « Impact of Precipitate Morphology on the Dissolution and Grain-Coarsening Behavior of a Ti-Nb Microalloyed Linepipe Steel ». Metals 10, n^o 1 (4 janvier 2020) : 89. http://dx.doi.org/10.3390/met10010089.

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The relationship between precipitate morphology and dissolution on grain coarsening behavior was studied in two Ti-Nb microalloyed Linepipe (LP) Steels. The developed understanding highlights the importance of the complex relationship between precipitate constitutive make-up, dissolution mechanism and grain boundary (GB) pinning force. Equilibrium-based empirical solubility products were used to calculate precipitate volume fractions and compared to experimental measurements. Scanning Electron Microscopy (SEM), Electron Backscatter Diffraction (EBSD) and Electron Probe Micro-Analysis (EPMA) were conducted on bulk samples. Transmission Electron Microscopy (TEM)-based techniques were used on C-replica extractions and thin-foils. A retardation in the grain-coarsening temperature compared to the predicted coarsening temperature based on equilibrium calculations was noticed. In addition, a consistent NbC epitaxial formation over pre-existing TiN was observed. The resulting reduction in total precipitate/matrix interface area and the low energy of the TiN/NbC interface are pointed to as responsible mechanisms for the retardation in the kinetics of precipitates’ dissolution. This dissolution retardation mechanism suggests that a lower Nb content might be effective in controlling the grain coarsening behavior of austenite.

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Liu, Chao, Youming Li et Yi Hou. « Basicity Characterization of Imidazolyl Ionic Liquids and Their Application for Biomass Dissolution ». International Journal of Chemical Engineering 2018 (2018) : 1–8. http://dx.doi.org/10.1155/2018/7501659.

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Alkalinity determination is of crucial significance for the applications of basic ionic liquids with imidazolyl. In this work, the ionization constant pKb value and acid function H- values of ionic liquids synthesized were calculated by pH method and UV spectrum-Hammett method. The dissolution ratio of biomass in these ionic liquids was measured at different temperatures. Finally, the relationship between the alkalinity and structure of these ionic liquids was discussed, and the relationship between the alkalinity of ionic liquid and the dissolution mechanism biomass was also discussed. The results show that the basicity of carboxylate ionic liquids is determined mainly by their anions, whereas cations take some finely tuned roles. Furthermore, cations and anions are equally important and are involved in dissolution mechanisms.

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Walshe, Nicole, Andrea Erxleben et Patrick McArdle. « Anisotropic crystal growth of carbamazepine form I and a hydroxysulfonamide ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C661. http://dx.doi.org/10.1107/s2053273314093383.

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Carbamazepine form I, CBZ, and 4-hydroxy-N-phenylbenzenesulfonamide, HPS, both exhibit highly anisotropic needle-like crystal growth. CBZ has been observed to have a corresponding anisotropy in its dissolution. Using the assumption that crystal growth and dissolution have reciprocal mechanisms[1] molecular dynamics, MD, simulations of CBZ and HPS crystal dissolution have been used to examine the mechanism of the needle growth/dissolution. MD simulations of CBZ dissolution using AMBER[2] reproduce the highly anisotropic crystal dissolution. Blocks containing between 48 and 256 molecules in 50 to 90 Å3 boxes of solvent show rapid loss of molecules from the a face. Simulation of HPS crystal dissolution also shows high anisotropy however the dissolution of HPS is much slower than that of CBZ due to the presence of hydrogen bonding chains in the structure. A two unit cell molecule centroid distance matrix analysis was used to detect molecular stacking in both structures. The direction of the hydrogen bonding in HPS is normal to the direction of growth. However the relatively rapid dissolution is in the stacking direction in both crystal structures and is attributed to the higher relative energy of surface molecules at the ends of the stacks that have a higher fraction of exposed atoms. A related analysis has been applied to flat molecule structures which are stacked. [3] If flat molecule stacks can be compared to stacks of pizza boxes then the non-flat molecules described here can be compared to stacked chairs.

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Vengrenovich, R. D., B. V. Ivanskii, M. O. Stasyk, S. V. Yarema, A. V. Moskaliuk, I. I. Panko, V. I. Kryvetskyi et I. V. Fesiv. « Ostwald Ripening of Nanodispersed Phases in Metal Alloys (review) ». Фізика і хімія твердого тіла 20, n^o 2 (10 juillet 2019) : 101–19. http://dx.doi.org/10.15330/pcss.20.2.101-119.

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The review deals with analysis of the kinetics of Ostwald ripening of nanodispersed phases in metal alloys when the growth (dissolution) of the nanoparticles of the reinforcing phase is controlled simultaneously by the matrix diffusion, diffusion through the dislocation tubes and the rate of the atoms transition through the interphase boundary (Wagner's mechanism of growth). As a rule, different mechanisms of the nanoparticles growth (dissolution) are simultaneously employed in the process of the particles ripening while the number of the mechanisms involved in the growth (one, two or three) depends on various factors such as: chemical composition of the nanodispersed phases, conditions of exploitation (changes in mechanical loads, temperature regimes, environmental conditions), technological conditions of synthesis, etc. The possibility of practical implementation of the proposed mechanisms of growth of nanoparticles in the Ostwald ripening process can be confirmed or declined by a comparison between the experimental and theoretical data. As seen from the comparison between some experimental histograms with the lines built theoretically, the proposed mechanisms of growth of the dispersed phase nanoparticles seem realistic.

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Heimgartner, P., et H. Bohni. « Mechanistic Aspects of Pit Growth on Nickel in Diluted Chloride Solutions ». Corrosion 41, n^o 12 (1 décembre 1985) : 715–19. http://dx.doi.org/10.5006/1.3583008.

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Abstract Pit current densities (CDs) in small pits have been found to be potential dependent, indicating an ohmic or mixed ohmic-charge transfer controlled dissolution mechanism. In a later stage of pit growth, a diffusion-controlled dissolution has often been reported. The potential-dependent mechanism is not always restricted to only the beginning of pit development, as has been shown in galvanostatic tests with rather low CDs. In this paper, the mechanism change from ohmic-charge transfer to diffusion-controlled pit growth was also studied in potentiostatic experiments by means of potential pulses added to the applied potential. The current response to fast potential changes differs for the two mechanisms. The influence of a number of parameters [such as potential, position of the specimen (horizontal or vertical), agitation of the bulk electrolyte, and pit diameter] on the transition time for mechanism change could be investigated using this pulse technique. Results also show that the rate law for pit growth can be very similar for the two types of mechanisms and different pit geometry (artificial pits of the wire type or “naturally” growing pits).

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Pramanik, Alokesh, M. N. Islam, Animesh Basak et Guy Littlefair. « Machining and Tool Wear Mechanisms during Machining Titanium Alloys ». Advanced Materials Research 651 (janvier 2013) : 338–43. http://dx.doi.org/10.4028/www.scientific.net/amr.651.338.

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This paper investigates the machining mechanism of titanium alloys and analyses those understandings systematically to give a solid understanding with latest developments on machining of titanium alloys. The chip formation mechanism and wear of different cutting tools have been analyzed thoroughly based on the available literature. It is found that the deformation mechanism during machining of titanium alloys is complex and it takes place through several processes. Abrasion, attrition, diffusion–dissolution, thermal crack and plastic deformation are main tool wear mechanisms.

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Bozhilov, Krassimir N., Thuy Thanh Le, Zhengxing Qin, Tanguy Terlier, Ana Palčić, Jeffrey D. Rimer et Valentin Valtchev. « Time-resolved dissolution elucidates the mechanism of zeolite MFI crystallization ». Science Advances 7, n^o 25 (juin 2021) : eabg0454. http://dx.doi.org/10.1126/sciadv.abg0454.

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Zeolite crystal growth mechanisms are not fully elucidated owing to their complexity wherein the formation of a particular zeolite can occur by more than one crystallization pathway. Here, we have conducted time-resolved dissolution experiments of MFI-type zeolite crystals in ammonium fluoride medium where detailed structural analysis allowed us to extrapolate and elucidate the possible mechanism of nucleation and crystal growth. A combination of electron and scanning probe microscopy shows that dissolution initiates preferentially at lattice defects and progressively removes defect zones to reveal a mosaic structure of crystalline domains within each zeolite crystal. This mosaic architecture evolves during the growth process, reflecting the changing conditions of zeolite formation that can be retroactively assessed during zeolite crystal dissolution. Moreover, a more general implication of this study is the establishment that dissolution can be used successfully as an ex situ technique to uncover details about crystal growth features inaccessible by other methods.

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Kim, Kyung Tae, Mantha Sai Pavan Jagannath, Gregory M. Su, Guillaume Freychet, Tongzhou Zeng, Kishore K. Mohanty, Graeme Henkelman, Lynn E. Katz et Charles J. Werth. « Surfactant inhibition mechanisms of carbonate mineral dissolution in shale ». Colloids and Surfaces A : Physicochemical and Engineering Aspects 625 (septembre 2021) : 126857. http://dx.doi.org/10.1016/j.colsurfa.2021.126857.

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Suter, Daniel, Steven Banwart et Werner Stumm. « Dissolution of hydrous iron(III) oxides by reductive mechanisms ». Langmuir 7, n^o 4 (avril 1991) : 809–13. http://dx.doi.org/10.1021/la00052a033.

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Morrow, Christin P., Shikha Nangia et Barbara J. Garrison. « Ab Initio Investigation of Dissolution Mechanisms in Aluminosilicate Minerals ». Journal of Physical Chemistry A 113, n^o 7 (19 février 2009) : 1343–52. http://dx.doi.org/10.1021/jp8079099.

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Le Moigne, Nicolas, et Patrick Navard. « Dissolution mechanisms of wood cellulose fibres in NaOH–water ». Cellulose 17, n^o 1 (21 novembre 2009) : 31–45. http://dx.doi.org/10.1007/s10570-009-9370-5.

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Chaudemanche, Cyril, et Patrick Navard. « Swelling and dissolution mechanisms of regenerated Lyocell cellulose fibers ». Cellulose 18, n^o 1 (13 octobre 2010) : 1–15. http://dx.doi.org/10.1007/s10570-010-9460-4.

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