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Showing 1 to 18 of 18 for “"selective dissolution"”.
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Selective Dissolution of Recent Coccoliths in the Atlantic Ocean
Made available in DSpace on 2014-12-11T18:10:03Z (GMT). No. of bitstreams: 1 7317403.pdf: 6118427 bytes, checksum: eac83a492b5c5ede25a3d2e8d20fb914 (MD5) Previous issue date: 1972
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Development of rapid techniques based on selective dissolution for the determination of the precious metals in geological samples
… samples is described. The technique is based on selective aqua regia acid leach followed by a selective extraction (using diphenylthiourea and 1,2-dichloroethane) to separate the PGE and Au as a group from concomitant matrix elements. Organic extracts and aqueous raffinates were analysed by …
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Corrosion and electrochemical behavior of Indium and Indium-Bismuth alloys in hydrochloric acid
… rate. In deaerated 3N HCl solutions, the selective dissolution of indium was the predominant mechanism in the corrosion of In-Bi alloys. The corrosion was always accompanied by a phase change on the surface and the corrosion rates of In-Bi alloys were found to increase in the presence of …
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Nucleation seeding in metakaolin geopolymers
… A secondary objective was to understand the dissolution of aluminosilicates in salicylic acid-methanol (SAM) solution. The SAM dissolution is a selective dissolution technique which has been used previously in our laboratory to remove calcium silicate hydrates from sodium aluminosilicate …
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Nanoporosity Formation in Ag-Au Alloys
Selective dissolution also known as dealloying is a corrosion process in which one component of a binary alloy system is selectively removed through an electrochemically controlled process which leads to the formation of a porous metal "sponge" with a porosity that is completely interconnected and …
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RECOVERY AND SEPARATION PROCESSES IN THE RECYCLING CHAIN OF POLYAMIDE PLASTIC MATERIALS TO OBTAINECO-SUSTAINABLE RAW MATERIALS
… optimizing a solvent-based recycling process to selectively recover polyamide from post-industrial and post-consumer textile and plastic waste. The process, known as selective dissolution, involves the use of a specific solvent or solvent mixture to dissolve only the target polymer (polyamide) …
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Investigations on the importance of early diagenetic processes for the mineralogical stabilisation and lithification of heterozoan carbonate assemblages : (Oligo-Miocene, Maltese Islands and Sicily)
… cementation phases, two phases of fabric selective and one of non-fabric selective dissolution, one phase of neomorphism and one of chemical compaction could be distinguished. The stable isotope measurements of the single cement phases pointed to cement precipitation from marine, …
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Sulfide immobilization with taconite tailings: products, capacity, and stability
… Select are explored further, firstly by their selective dissolution with various acids and secondly by the reactivity of these acid-treated fractions with sulfide. By comparison, the contributions of individual silicate mineral phases to sulfide immobilization were assessed. Chapter 4 provides …
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Iron-Carbon Associations In Tropical Soils Of The Luquillo Critical Zone
… analytical techniques and inorganic selective dissolution experiments. We found low-crystallinity, short-range-order (SRO) iron and crystalline iron phases exert control on distinct reservoirs of soil C across both soil types. Notably, organomineral associations were responsible for …
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Assessment of the corrosion behaviour of alloys 825 and 625 in stagnant seawater-effect of temperature and welding
… only one mode of corrosion attack, namely the selective dissolution of interdendritic phase throughout the test temperature range. There was no agreement between the CPT results for alloy 825 and its weldment obtained using the three standard methods. No correlation was found between CPT …
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Reclamation and Reprocessing of Thermotropic Liquid Crystalline Polymer from Composites of Polypropylene Reinforced with Liquid Crystalline Polymer
… an organic peroxide and reactive extrusion to selectively degrade only the polypropylene, and not the thermotropic liquid crystalline polymer. The degraded polypropylene was selectively dissolved away from the liquid crystalline polymer by stirring the extruded melt in boiling mineral oil. The …
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In situ investigation of the dealloying process using environmental transmission electron microscopy
… process where a constituent of a metal alloy selectively dissolves out of the host metal, leaving behind a porous network. The process is thought to proceed by either surface diffusion or bulk diffusion. While the process has been studied extensively in the past, it was primarily on model …
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Nanoporous Platinum
… process in which one or more elements are selectively removed from an alloy leading to a 3-dimensional porous structure of the more noble element(s). These porous structures have been known to cause stress corrosion cracking in noble metal alloy systems but more recent interest in using the …
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Corrosion and Tribocorrosion Kinetics of Al-based Concentrated Alloys in Aqueous Sodium Chloride Solution
… consisted of aluminum oxide where manganese was selectively dissolved. Despite extensive past research, the fundamental understanding of the alloying effects on the atomistic structure, composition, and chemical state of the passive layer of Al alloys and their formation mechanism is still not …
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Investigation of mixing in the melting regime during polymer compounding
… forming the continuous phase initially. Selective dissolution studies were used to quantify the amount of minor component present in the continuous phase at different mixing times. A polystyrene/polyethylene blend with a melt viscosity ratio of -0.001. was used to study the effect of …
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The Influence of Amorphous, Sub-Micrometer Silica Particles in Cement Pastes and Mortars with Very Low Water-to-Cement Ratios (Ultra-High Performance Concrete)
… silica enhances clinker hydration due to its dissolution and subsequent pozzolanic reaction to calcium–silicate–hydrate phases (C–S–H phases) and/or due to a heterogeneous nucleation of C–S–H phases from alite hydration on silica surfaces (seeding effect). Herein, the influence of the …
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Deep Eutectic Solvents Synthesis, Characterization and Applications in Pretreatment of Lignocellulosic Biomass
… and cell lines. The utilization of DESs for the dissolution of biopolymers such as cellulose, hemicellulose, and lignin was evaluated. The DESs selective dissolution of lignin was further explored and an extraction method optimized to selectively extract lignin from lignocellulosic biomass. The …
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Investigations on sedimentology and early diagenesis in shallow-water warm-temperate to tropical miocene carbonates : a case study from Northern Sardinia, Italy
… of secondary porosity is the product of fabric-selective dissolution of grains (aragonite, high-Mg calcite) and/or cements (syntaxial inclusion-rich). However, stratigraphy and stable isotopes (oxygen and carbon), indicate that the molds found at shallower facies located beneath, and close to …