Relevant bibliographies by topics / Metal sulfide

Academic literature on the topic 'Metal sulfide'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Metal sulfide"

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Zhang, Ya Hui, Xi Cheng, and Qing Wang. "A Low Temperature Precursor Sulfuration Route to Metal Sulfides Nanomaterials." Advanced Materials Research 148-149 (October 2010): 1404–7. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1404.

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A low-temperature precursor sulfuration route has been established to prepare metal sulfides with different nanostructures during the synthesis of nickel sulfide. The advantages of the low-temperature precursor sulfuration route were testified by the synthesis of different metal sulfides ( lead sulfide, zinc sulfide and cobalt sulfide). It offers a novel path to the preparation of other metal sulfides.
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Jayaranjan, Madawala Liyanage Duminda, and Ajit P. Annachhatre. "Precipitation of heavy metals from coal ash leachate using biogenic hydrogen sulfide generated from FGD gypsum." Water Science and Technology 67, no. 2 (January 1, 2013): 311–18. http://dx.doi.org/10.2166/wst.2012.546.

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Investigations were undertaken to utilize flue gas desulfurization (FGD) gypsum for the treatment of leachate from the coal ash (CA) dump sites. Bench-scale investigations consisted of three main steps namely hydrogen sulfide (H2S) production by sulfate reducing bacteria (SRB) using sulfate from solubilized FGD gypsum as the electron acceptor, followed by leaching of heavy metals (HMs) from coal bottom ash (CBA) and subsequent precipitation of HMs using biologically produced sulfide. Leaching tests of CBA carried out at acidic pH revealed the existence of several HMs such as Cd, Cr, Hg, Pb, Mn, Cu, Ni and Zn. Molasses was used as the electron donor for the biological sulfate reduction (BSR) process which produced sulfide rich effluent with concentration up to 150 mg/L. Sulfide rich effluent from the sulfate reduction process was used to precipitate HMs as metal sulfides from CBA leachate. HM removal in the range from 40 to 100% was obtained through sulfide precipitation.
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Anenburg, Michael, and John A. Mavrogenes. "Noble metal nanonugget insolubility in geological sulfide liquids." Geology 48, no. 9 (June 5, 2020): 939–43. http://dx.doi.org/10.1130/g47579.1.

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Abstract Noble metals (NMs) in Earth’s magmatic systems are thought to be controlled entirely by their strong partitioning to sulfide liquids. This chemical equilibrium is at the root of various models, ranging from NM deposit formation to planetary differentiation. Noble metals commonly occur as sub-micrometer phases known as nanonuggets. However, the assumptions that nanometer-scale thermodynamic equilibrium partitioning is attained and that NM nanonuggets are soluble in sulfide liquids have never been validated. Using novel experimental methods and analytical techniques we show nanometer-scale NM ± Bi phases attached to exterior surfaces of sulfide liquids. Larger phases (≤1 µm) show clear liquid immiscibility textures, in which Fe, Cu, and Ni partition into sulfide liquids whereas NMs partition into bismuthide liquids. Noble metal compositions of sulfides and their associated NM phases vary between adjacent droplets, indicating NM disequilibrium in the system as a whole. We interpret most nanometer-scale NMs contained within sulfides to be insoluble as well, suggesting that previously reported sulfide–silicate partition coefficients are overestimated. Consequently, sulfide liquids likely play a secondary role in the formation of some NM ore deposits.
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Huergo, J., C. Bernardelli, M. Viera, Wolfgang Sand, and Edgardo R. Donati. "FISH Analysis of Bacterial Attachment to Copper Sulfides in Bioleaching Processes." Advanced Materials Research 71-73 (May 2009): 329–32. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.329.

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Bioleaching is the biological conversion of an insoluble metal compound into a water soluble form. In this process metal sulfides are oxidized to metal ions and sulfate by acidophilic microorganisms capable of oxidizing Fe2+ and/or sulfur-compounds. The metal solubilization from sulfide minerals is a chemical process which requires Fe3+ reduction. It is an environmentally friendly technique and an economical method for recovering metals that requires low investment and operation costs. In this work we studied the bioleaching of two kinds of acid-soluble copper sulfides, one easily leached by mesophilic bacteria (covellite), and the other one refractory to their activity (chalcopyrite), in acidic media with or without Fe2+ ions. We studied attached and planktonic populations of autotrophic bacteria, such as Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans in pure or mixed cultures. The influence of a heterotrophic microorganism, Acidiphilium cryptum, was also studied. Attachment was evaluated with fluorescence staining and FISH using four specific probes. L. ferrooxidans showed highest initial attachment in all cases. The presence of Ap. cryptum increased the cell attachment compared with the autotrophic pure cultures. It was possible to correlate experimental data with a mechanism of bacterial-metal sulfide oxidation, the polysulfide pathway for acid- soluble metal sulfides.
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Moroz, O. M., S. O. Hnatush, O. V. Tarabas, C. I. Bohoslavets, G. V. Yavorska, and B. M. Borsukevych. "Sulfidogenic activity of sulfate and sulfur reducing bacteria under the influence of metal compounds." Biosystems Diversity 26, no. 1 (April 5, 2018): 3–10. http://dx.doi.org/10.15421/011801.

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Due to their high content in natural environments, heavy metals exhibit toxic effects on living organisms, which leads to a decrease in the biological diversity and productivity of ecosystems. In niches with low oxidation reducing potential, sulfate and sulfur reducing bacteria carry out the reducing transformation of oxidized sulfur compounds with the formation of significant amounts of hydrogen sulfide. H2S produced by bacteria interacts with metal ions, precipitating them in the form of sulfides. The aim of this work was to investigate the influence of lead, cuprum (II), iron (II) and manganese (II) salts on the production of hydrogen sulfide by bacteria of the Desulfovibrio and Desulfuromonas genera, isolated from Yavorivske Lake, and to evaluate the efficiency of their use for purifying media, enriched with organic compounds, from hydrogen sulfide and heavy metals. The content of heavy metal ions in the water of Yavorivske Lake was determined by the spectrophotometric method. The bacteria were grown for 10 days at 30 °C in the Kravtsov-Sorokin medium under anaerobic conditions. To study the influence of metal ions on bacteria growth and their H2S production, cells were incubated with metal salts (0.5–4.0 mM), washed and grown in media with SO42– or S0. To determine the level of metal ions binding by H2S, produced by bacteria, cells were grown in media with metal compounds (0.5–4.0 mM), SO42– or S0. Biomass was determined by turbidimetric method. In the cultural liquid the content of H2S was determined quantitatively by spectrophotometric method, and qualitatively by the presence of metal cations. The content of metal sulfides in the growth medium was determined by weight method. Sulfate and sulfur-reducing bacteria were resistant to 2.0 mM Pb(NO3)2, 2.5 mM CuCl2, 2.5 mM FeCl2 × 4H2O and 2.0 mM MnCl2 × 4H2O, therefore they are promising for the development of biotechnologies for the purification of water resources contaminated by sulfur and metal compounds. When present in a medium with sulfates or sulfur of 1.0–1.5 mM lead, cuprum (II), iron (II) or manganese (II) ions, they almost completely bind with the H2S produced by bacteria in the form of insoluble sulfides, which confirms the negative results of qualitative reactions to their presence in the cultural liquid.
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Zheng, Rikuan, Shimei Wu, and Chaomin Sun. "Pseudodesulfovibrio cashew sp. Nov., a Novel Deep-Sea Sulfate-Reducing Bacterium, Linking Heavy Metal Resistance and Sulfur Cycle." Microorganisms 9, no. 2 (February 19, 2021): 429. http://dx.doi.org/10.3390/microorganisms9020429.

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Sulfur cycling is primarily driven by sulfate reduction mediated by sulfate-reducing bacteria (SRB) in marine sediments. The dissimilatory sulfate reduction drives the production of enormous quantities of reduced sulfide and thereby the formation of highly insoluble metal sulfides in marine sediments. Here, a novel sulfate-reducing bacterium designated Pseudodesulfovibrio cashew SRB007 was isolated and purified from the deep-sea cold seep and proposed to represent a novel species in the genus of Pseudodesulfovibrio. A detailed description of the phenotypic traits, phylogenetic status and central metabolisms of strain SRB007 allowed the reconstruction of the metabolic potential and lifestyle of a novel member of deep-sea SRB. Notably, P. cashew SRB007 showed a strong ability to resist and remove different heavy metal ions including Co2+, Ni2+, Cd2+ and Hg2+. The dissimilatory sulfate reduction was demonstrated to contribute to the prominent removal capability of P. cashew SRB007 against different heavy metals via the formation of insoluble metal sulfides.
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Roussel, Jimmy, A. J. Murray, John Rolley, D. Barrie Johnson, and L. E. Macaskie. "Biosynthesis of Zinc Sulfide Quantum Dots Using Waste Off-Gas from Metal Bioremediation Process." Advanced Materials Research 1130 (November 2015): 555–59. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.555.

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Dissimilatory reduction of sulfate, mediated by various species of sulfate-reducing bacteria (SRB), can be used to remediate acid mine drainage (AMD). Hydrogen sulfide (H2S/HS-) generated by SRB can be used to remove toxic metals from AMD as sulfide biominerals. For this, SRB are usually housed in separate reactor vessels to those where metal sulfides are generated; H2S is delivered to AMD-containing vessels in solution or as a gas. This allows more controlled separation of metal precipitation and facilitates enhanced process control. Industries such as optoelectronics use quantum dots (QDs) in, for example, light emitting diodes and solar photovoltaics. QDs are nanocrystals with semiconductor bands that allow them to absorb light and re-emit it intensely at specific wavelength couples. Small nanoparticles have the possibility to get electrons shifted to a higher energy and then emit light during the relaxation phase. The QD elemental composition and the presence of doping agent determines its electronic band gaps and can be used to tune the QD to desired emission wavelengths. Traditional QD production at scale is costly and/or complex. Waste H2S gas from growth of SRB has been used to make zinc sulfide QDs which are indistinguishable from ’classically’ prepared counterparts with respect to their physical and optical properties. Clean recycling of minewater bioremediation process waste gas into high value QD product is described.
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Thériault, Robert D., Sarah-Jane Barnes, and Mark J. Severson. "The influence of country-rock assimilation and silicate to sulfide ratios (R factor) on the genesis of the Dunka Road Cu – Ni – platinum-group element deposit, Duluth Complex, Minnesota." Canadian Journal of Earth Sciences 34, no. 4 (April 1, 1997): 375–89. http://dx.doi.org/10.1139/e17-033.

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The Dunka Road deposit is one of several Cu – Ni – platinum-group element (PGE) sulfide occurrences found along the northwestern margin of the Duluth Complex, where the host troctolitic rocks are in contact with metasedimentary rocks of the Animikie Group. Magma contamination through assimilation of sulfidic argillaceous country rocks is generally recognized as having played a key role in the genesis of the mineralization. Three main types of disseminated sulfide mineralization have been identified within the Dunka Road deposit: (i) norite-hosted sulfides, (ii) troctolite-hosted sulfides, and (iii) PGE-rich sulfide horizons. The norite-hosted sulfides are found either adjacent to country-rock xenoliths or near the basal contact. The troctolite-hosted sulfides form the bulk of the deposit, and occur throughout the lower 250 m of the intrusion. The PGE-rich sulfide horizons are typically localized directly beneath ultramafic layers. The composition of the different types of sulfide occurrences is modelled using Cu/Pd ratios. It is shown that each type results from the interplay of two main parameters, namely the degree of magma contamination and the silicate magma to sulfide melt ratio (R factor). The norite-hosted sulfides formed at low R factors and high degrees of contamination, as expressed by their PGE-depleted nature, low Se/S ratios, and elevated content in pyrrhotite and arsenide minerals. The troctolite-hosted sulfides formed at moderate R factors and small degrees of contamination, as shown by their moderate PGE content and mantle-like Se/S ratios. Finally, the PGE-rich sulfide horizons are modelled using elevated R factors from an uncontaminated parental magma, which is substantiated by their elevated noble metal content and Se/S ratios, and low pyrrhotite to precious metal sulfide ratio.
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Edgcomb, Virginia P., Stephen J. Molyneaux, Mak A. Saito, Karen Lloyd, Simone Böer, Carl O. Wirsen, Michael S. Atkins, and Andreas Teske. "Sulfide Ameliorates Metal Toxicity for Deep-Sea Hydrothermal Vent Archaea." Applied and Environmental Microbiology 70, no. 4 (April 2004): 2551–55. http://dx.doi.org/10.1128/aem.70.4.2551-2555.2004.

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ABSTRACT The chemical stress factors for microbial life at deep-sea hydrothermal vents include high concentrations of heavy metals and sulfide. Three hyperthermophilic vent archaea, the sulfur-reducing heterotrophs Thermococcus fumicolans and Pyrococcus strain GB-D and the chemolithoautotrophic methanogen Methanocaldococcus jannaschii, were tested for survival tolerance to heavy metals (Zn, Co, and Cu) and sulfide. The sulfide addition consistently ameliorated the high toxicity of free metal cations by the formation of dissolved metal-sulfide complexes as well as solid precipitates. Thus, chemical speciation of heavy metals with sulfide allows hydrothermal vent archaea to tolerate otherwise toxic metal concentrations in their natural environment.
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Zheng, He Hua, Hui Li Liu, Quan Bi Huang, and Qin Hua Li. "The Release Mechanism of Heavy Metals from Sulfide Tailings." Advanced Materials Research 1073-1076 (December 2014): 833–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.833.

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The sulfide tailings is the main type of non-ferrous metals mine tailings, in which the sulfides could react with air, rain water and microorganism, etc. and then release some ions through a series of complex chemical interactions. The heavy metal ions leaching from tailings will cause serious pollution to the environment of mine region. The release mechanisms and effect factors of heavy metals ions from sulfide tailings are summarized in this paper.
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Dissertations / Theses on the topic "Metal sulfide"

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Karayilan, Dilek. "Removal Of Hydrogen Sulfide By Regenerable Metal Oxide Sorbents." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605046/index.pdf.

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ABSTRACT REMOVAL OF HYDROGEN SULFIDE BY REGENERABLE METAL OXIDE SORBENTS Karayilan, Dilek M.S., Department of Chemical Engineering Supervisor : Prof. Dr. Timur Dogu Co-Supervisor: Prof. Dr. Gü
lSen Dogu June 2004, 166 pages High-temperature desulfurization of coal-derived fuel gases is an essential process in advanced power generation technologies. It may be accomplished by using metal oxide sorbents. Among the sorbents investigated CuO sorbent has received considerable attention. However, CuO in uncombined form is readily reduced to copper by the H2 and CO contained in fuel gases which lowers the desulfurization efficiency. To improve the performance of CuO-based sorbents, they have been combined with other metal oxides, forming metal oxide sorbents. Sulfidation experiments were carried out at 627 oC using a gas mixture composed of 1 % H2S and 10 % H2 in helium. Sorbent regeneration was carried out in the same reactor on sulfided samples at 700 oC using 6 % O2 in N2. Total flow rate of gas mixture was kept at 100 ml/min in most of the experiments. In this study, Cu-Mn-O, Cu-Mn-V-O and Cu-V-O sorbents were developed by using complexation method. Performance of prepared sorbents were investigated in a fixed-bed quartz microreactor over six sulfidation/regeneration cycles. During six cycles, sulfur retention capacity of Cu-Mn-O decreased slightly from 0.152 to 0.128 (g S)/(g of Sorbent) while some decrease from 0.110 to 0.054 (g S)/(g of Sorbent) was observed with Cu-Mn-V-O. Cu-V-O showed a very good performance in the first sulfidation and excessive thermal sintering in the first regeneration prevented further testing. Sulfur retention capacity of Cu-V-O was calculated as 0.123 (g S)/(g of Sorbent) at the end of the first sulfidation. In addition, SO2 formation in sulfidation experiments was observed only with Cu-V-O sorbent.
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MacLachlan, Andrew. "Tuning morphology of hybrid organic/metal sulfide solar cells." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25766.

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This thesis explores the influence that morphology plays in hybrid organic/inorganic solar cells. This is studied for a range of different materials systems. A series of cadmium xanthate complexes were synthesised, for use as in-situ precursors to CdS nanoparticles in hybrid poly(3-hexylthiophene-2,5-diyl (P3HT)/CdS solar cells. The heterojunction morphology of these hybrid P3HT/CdS blends was found to be dependent on the ligand moiety of the precursor used. The formation of CdS domains was studied by time-resolved materials characterisation techniques and directly imaged using electron microscopy. A combination of transient absorption spectroscopy (TAS) and photovoltaic device performance measurements was used to show the intricate balance required between charge photogeneration and having percolated domains in order to effectively extract charges to maximize device power conversion efficiencies. An analogous method was also applied to a P3HT/Sb_2 S_3 system. Following on from the previous work, a non-toxic alternative to CdS and Sb2S3 was explored. Bismuth xanthates were thermally decomposed to form hybrid polymer/Bi_2 S_3 heterojunctions with two distinctly different morphologies. The bismuth xanthates were found to form nanorods in-situ, within the solid-state polymer matrix, as well as mesostructured arrays of Bi_2 S_3 rods that were later infiltrated with a polymer, using a two-step method. TAS was used to study the charge generation yield in both these systems and hybrid photovoltaic devices were also fabricated. Finally, through a collaboration with The Institute of Photonic Sciences (ICFO), TAS was used to study two separate organic semiconductor/Bi_2 S_3 BHJs. The first of which was a P3HT/Bi_2 S_3 nanoparticle blend solar cell. The charge generation yield in this system was investigated and then compared to a novel thiol-functionalised P3HT based block copolymer (P3HT-SH). Secondly, TAS was used to obtain a better understanding of the charge transfer at several interfaces in a vertically structured Bi_2 S_3 nanorod array that was filled with 2,2',7,7'-Tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (SPIRO).
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Mbese, Johannes Zanoxolo. "Synthesis and characterization of metal sulfide nanoparticles/polymer nanocomposites." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016190.

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The focus of this project was to synthesize and characterize metal sulfide nanoparticles /polymer nanocomposites. The work involved the synthesis of dithiocarbamato ligands and complexes derived from aniline. Zn(II), Cd(II) and Hg(II) dithiocarbamato complexes were used as single-molecule precursors for the synthesis of the ZnS, CdS and HgS nanoparticles and their optical and structural properties studied. The other focus of this work was to synthesize a combined functionality metal sulfide nanoparticles/polymer nanocomposites by dispersing as-synthesized ZnS, CdS and HgS nanoparticles in polymethyl methacrylate (PMMA) matrix. The characterization of the ligands, complexes, nanoparticles and nanocomposites were investigated using relevant instrumental tools like UV-Vis, photoluminescence (PL), Fourier transform infrared (FTIR), X-ray diffraction (XRD), energy dispersion X-ray (EDX), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
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Ramasamy, Karthik. "New molecular precursors for metal sulfides." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/new-molecular-precursors-for-metal-sulfides(49bcd8c0-4a37-4eb1-892e-7a7973f8f3cd).html.

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Metal sulfide thin films are important class of materials which have applications in photovoltaics, microelectronics and displays. Chemical vapour deposition (CVD) is well known method for the deposition of high quality thin films. Very few classes of single source precursors (eg: dithiocarbamates, xanthates) were successful for the deposition of good quality metal sulfide films by MOCVD. This limited choice was due to the difficulties of finding precursors with suitable physico-chemical properties. Hence, it is important to develop precursors with suitable volatility, solubility and being able to deposit films with little or no contamination. This work describes the synthesis of a series of metal (Fe, Co, Ni, Zn, Cd) complexes of thio- and dithio-biuret ligands, their structural and spectroscopic characterization and thermal decomposition. The complexes were used as single source precursors for the deposition of iron, cobalt, nickel, zinc, cadmium and zinc cadmium sulfide thin films by AACVD. The effect of alkyl groups, coordinating atoms, deposition temperatures on phases and morphology of the films were studied. The deposited films were characterised by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and atomic force microscopy (AFM). The complex [Fe(SON(CNiPr2)2)3] gave hexagonal troilite FeS films with small amount of tetragonal pyrrhotites Fe1-xS at 300 °C, whereas only troilite FeS was deposited at 350, 400 or 450 °C. Complexes [Fe2(µ-OMe)2 (SON(CNEt2)2)2] and [Fe(SON(CNEt2)2)3] deposited a mixture of hexagonal troilite FeS and cubic pyrite FeS2 films at all temperatures. [Fe(SON(CNMe2)2)3] deposited very thin films of FeS at all temperatures as troilite. Complexes [Co(N(SCNMe2)2)3] and [Co(N(SCNEt2)2)3] deposited hexagonal Co1-xS films at all temperatures of 350-500 °C, whereas [Co(SON(CNiPr2)2)2] gave mixture of cubic and hexagonal Co4S3 films at 280-400 °C. Thiobiuret complex [Ni(SON(CNMe2)2)2] gave orthorhombic Ni7S6. Complexes [Ni(SON(CNMe2CNEt2))2] and [Ni(SON(CNEt2)2)2] gave mixtures of hexagonal Ni17S18 and orthorhombic Ni7S6. In contrast, [Ni(SON(CNiPr2)2)2] gave orthorhombic Ni9S8. Dithiobiuret complexes [Ni(N(SCNMe2SCNEt2))2] and [Ni(N(SCNEt2)2)2] gave hexagonal NiS1.03 at 360 and 400 °C, orthorhombic Ni7S6 phase at 440 and 480 °C. The zinc complexes [Zn(N(SCNMe2)2)2] and [Zn(SON(CNiPr2)2)2] deposited cubic ZnS at 300 and 350 °C, whereas at 400 and 450 °C hexagonal ZnS were apparent [Zn(N(SCNEt2)2)2] gave hexagonal ZnS films at all deposition temperatures. Cadmium complexes [Cd(N(SCNMe2)2)2], [Cd(N(SCNEt2)2)2] and [Cd(SON(CNiPr2)2)2] gave hexagonal CdS films at all deposition temperatures.
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Aldemir, Müge. "Metal oxide supported cadmium sulfide for photocatalytic synthesis of homoallylamines." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978677617.

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Charron, Luc G. "Radiative properties of molybdenum sulfide and other transition metal dichalcogenides." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26599.

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Low temperature radiative properties of the layered transition metal dichalcogenides 2H-MoS2, 2H-WS2 and 2H-WSe 2 are investigated. Synthetically grown crystals of all three materials, natural 2H-MoS2 single crystals and several 2H-MoS2 and 2H-WS2 commercial powders are studied. Steady-state photoluminescence (PL) measurements performed on the samples reveal two distinct radiative regions in the near infrared. The first region consisting of several sharp lines is produced by bound excitons related to the halogen transport agent intercalated within the van der Waals gap of the layered compounds. The second weaker region, composed of a broad spectral band, originates from the radiative recombination between an intrinsic crystal lattice defect center and the valence band in the conditions of a strong electron-phonon coupling. Time decay analysis of the bound excitonic radiative transitions is performed with time-resolved and PL intensity ratio measurements. The spectral and temperature dependence of the total radiative emissions of all three compounds are described in the framework of a two-channel kinetic recombination model in thermal equilibrium conditions. A configuration coordinate diagram is also constructed for 2H-MoS 2. PL intensity measurements performed on the 2H-MoS2 and 2H-WS2 synthetic crystals reveal a sublinear PL dependence on excitation intensity. Finally a technique developed to intercalate halogen molecules in natural 2H-MoS2 single crystals is described.
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Janyasuthiwong, Suthee. "Biogenic sulfide production at low pH and selected metal precipitation for e-waste leachate treatment." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1056/document.

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La contamination métallique dans l'environnement est l'un des problèmes mondiaux persistants car non seulement elle perturbe la qualité de l'environnement, mais aussi l'environnement et la santé humaine. La principale contribution à ce problème se pose principalement des activités anthropiques telles que les industries. La rareté de métal est devenu plus sévère récents où certains éléments ont été prédit pour être pleinement éradiquée depuis plusieurs décennies de la croûte terrestre. Récemment, des chercheurs ont concentré leur attention pour récupérer ces métaux dans le flux des déchets et de la réutiliser dans les processus de production industrielle. L'utilisation des déchets agricoles comme adsorbant potentiel à faible coût pour l'enlèvement des métaux lourds des eaux usées est une des technologies les plus polyvalents. Dans cette étude entre les différents adsorbants testés, coquille d'arachide établi rendements d'épuration élevés avec moins d'exigences pour un traitement ultérieur de poste pour le Cu, Pb et Zn retrait. En outre, les expériences de lots sur les principaux effets des paramètres du procédé (pH, adsorbant dosage, temps de contact et de la concentration initiale de métal) ont montré un effet majeur sur l'absorption des métaux et de l'efficacité de l'enlèvement. Pour la régénération matériau, HCl 0.2 M était la solution de désorption la plus efficace qui ne altère pas l'efficacité, jusqu'à trois cycles d'adsorption et de désorption. L'utilisation de bactéries réductrices de sulfate (SRB) dans des bioréacteurs est une autre technologie qui peut être appliqué pour le traitement de métal contaminé les eaux usées. Le SRB réduire le sulfate en sulfure, qui réagit en outre avec des métaux pour former des précipités de sulfures métalliques. Le lit fluidisé (IFB) bioréacteur inverse est la configuration qui présente la proéminence en utilisant la technologie de SRB pour le traitement des eaux usées métalliques contaminés. Deux bioréacteurs IFB ont été opérés à différents pH (7.0 et 5.0). L'activité de SRB à pH 7.0 était plus élevée qu'à un pH de 5.0, ce qui montre que le pH est le principal facteur qui affecte SRB. Cependant, le thiosulfate a montré une efficacité supérieure à celle du sulfate en tant qu'accepteur d'électrons alternatif. Le sulfure produit en utilisant du thiosulfate comme accepteur d'électrons était 157.0 mg / L, tandis que seulement 150.2 mg / L a été produit en utilisant du sulfate et il a fallu une période d'adaptation à un pH de 5.0 avant la réussite de l'opération. En outre, l'IFB a montré sa grande efficacité pour le Cu, Ni et Zn élimination des eaux usées synthétique. L'élimination de Cu et Zn étaient plus de 90% à pH 7.0 et 5.0, à une concentration initiale de métal de 25 mg / L. D'autre part, l'élimination de Ni ne était pas éliminé à une concentration initiale de 25 mg / L comme il a montré des effets toxiques à l'égard SRB. Il existe différents types de flux de déchets contaminés par des métaux qui se présentent comme un bon candidat pour la récupération des métaux comprennent e-déchets. Cet e-déchets a un fort potentiel en tant que source secondaire de métal pour récupérer les métaux en particulier base tels que Cu, Ni et Zn. Cartes de circuits imprimés (PCB) d'ordinateurs personnels ont été évalués comme source secondaire potentielle de Cu, Ni et Zn en utilisant des méthodes de précipitation hydrométallurgiques et de sulfure. Les conditions optimales pour la lixiviation des métaux étaient de 0.1 M HNO3 avec un rapport liquide solide de 20 à l'aide de PCB de 0.5 - taille des particules de 1.0 mm à 60 ° C qui a abouti à 400 mg Cu / g PCB. Avec la précipitation de sulfure à un rapport stoechiométrique de 1: 1 (Cu: S2-), la récupération de Cu a été très efficace jusqu'à 90% de la solution de lixiviation a représenté à environ 0.41 g Cu / g BPC, tout en Ni et Zn étaient récupération 40 % et 50% pour les lixiviats d'une colonne à courant ascendant de lixiviation, respectivement
Metal contamination in the environment is one of the persisting global issues since it not only disturbs the environmental quality but also the environment and human health. The major contribution to this problem arises mainly from anthropogenic activities such as industries. Metal scarcity has become more severe lately where some elements have been predicted to be fully eradicated in several decades from the earth crust. Recently, researchers have focused their attention to recover these metals from the waste stream and reuse it in industrial production processes. The use of agricultural wastes as a potential low cost adsorbent for heavy metal removal from wastewater is one of the most versatile technologies. In this study among the different adsorbents tested, groundnut shell established high removal efficiencies with fewer requirements for further post treatment for Cu, Pb and Zn removal. Furthermore, the batch experiments on the main effects of process parameters (pH, adsorbent dosage, contact time and initial metal concentration) showed a major effect on metal uptake and removal efficiency. For material regeneration, 0.2 M HCl was the most effective desorbing solution that did not alter the efficiency, up to three cycles of adsorption and desorption. The use of sulfate reducing bacteria (SRB) in bioreactors is another technology that can be applied for the treatment of metal contaminated wastewater. The SRB reduce sulfate into sulfide which further reacts with metals to form metal sulfide precipitates. The inverse fluidized bed (IFB) bioreactor is the configuration which shows prominence in utilizing SRB technology for metal contaminated wastewater treatment. Two IFB bioreactors were operated at different pH (7.0 and 5.0). The sulfate reducing activity (SRA) at pH 7.0 was higher than at pH 5.0, which shows that pH is the main factor that affects SRA. However, thiosulfate showed a higher efficiency than sulfate as an alternate electron acceptor. The sulfide produced using thiosulfate as the electron acceptor was 157.0 mg/L, while only 150.2 mg/L was produced using sulfate and it required an adaptation period at pH 5.0 prior to successful operation. Moreover, the IFB had shown its high efficiency for Cu, Ni and Zn removal from synthetic wastewater. The removal of Cu and Zn were more than 90% at pH 7.0 and 5.0, at an initial metal concentration of 25 mg/L. On the other hand, Ni removal was not removed at an initial concentration of 25 mg/L as it showed toxic effects toward SRB. There are various types of metal contaminated waste streams which pose as a good candidate for metal recovery include electronics waste (e-waste). This e-waste has a high potential as secondary source of metal to recover especially base metals such as Cu, Ni and Zn. Printed circuit boards (PCBs) of personal computers were evaluated as the potential secondary source of Cu, Ni and Zn using hydrometallurgical and sulfide precipitation methods. The optimal conditions for metal leaching were 0.1 M HNO3 with a liquid to solid ratio of 20 using PCBs of 0.5 - 1.0 mm particle size at 60 °C which resulted in 400 mg Cu/g PCBs. With sulfide precipitation at a stochiometric ratio of 1:1 (Cu:S2-), the recovery of Cu was very effective up to 90% from the leachate which accounted to approximately 0.41 g Cu/g PCBs, while Ni and Zn recovery were 40% (0.005 g Ni/g PCBs) and 50% (0.006 g Zn/g PCBs) for leachate from an upflow leaching column, respectively. This indicates Cu can be recovered from PCBs using sulfide precipitation
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LI, Bihong. "EFFECTS OF METAL AND METAL SULFIDE INCORPORATION ON PORPHYRIN AND RUTHENIUM DYE SENSITIZED SOLAR CELLS." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1484141398978806.

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Arancon, Rick Arneil. "Exploration of Transition Metal Sulfide Catalysts Prepared by Controlled Surface Chemistry." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN063.

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L'hydrotraitement est un procédé catalytique important dans le raffinage du pétrole qui utilise des catalyseurs bimétalliques sulfurés NiWS ou NiMoS (ou CoMoS) supportés sur alumine. Leur mode conventionnel de préparation implique l’imprégnation d'une solution aqueuse de sels de Mo/W et de Ni/Co, puis l’activation par un agent sulfo-réducteur (H2S/H2). Pour répondre aux exigences environnementales et améliorer l'efficacité de l'hydrotraitement, des améliorations permanentes de la performance de ces systèmes catalytiques sont attendues. Ce travail se concentre sur la préparation de catalyseurs d'hydrotraitement hautement actifs par une approche de chimie de surface contrôlée (CSC) qui implique l'imprégnation successive de précurseurs moléculaires de MoV et NiII en solvant organique sur un support silice-alumine traité thermiquement. Dans la première partie de cette thèse, la genèse de la phase active du catalyseur CSC et conventionnel Mo et NiMo est étudiée par quick-XAS combinée à d’autres techniques (chimiométrie, XPS, RPE, STEM-HAADF, modélisation moléculaire). Nous proposons ainsi des structures moléculaires depuis les précurseurs oxydes de Mo et Ni supportés jusqu’aux nombreuses espèces intermédiaires (oxysulfure et sulfures) en fonction de la température. Cette analyse multi-technique permet d'abord de révéler les spécificités de la genèse des catalyseurs CSC et conventionnels qui peuvent expliquer leurs différentes activités catalytiques. Ensuite, elle révèle également de nouvelles connaissances sur les mécanismes d’insertion du Ni dans la phase NiMoS en fonction de la préparation. Dans la seconde partie, la possibilité de remplacer Co et Ni comme promoteurs est explorée. Ceci est entrepris en synthétisant des catalyseurs alternatifs de type XYMoS, où X et Y sont des métaux de transition 3d. Comme suggéré par des études de modélisation quantiques antérieures, certaines formulations XYMoS peuvent présenter un effet de synergie analogue à ceux des phases actives CoMoS et NiMoS. L’étude des formulations les plus prometteuses méritent d'être approfondies afin de mieux comprendre leur fonctionnement
Hydrotreating is an important catalytic process in petroleum refining which uses sulfided bimetallic catalysts NiWS or NiMoS (or CoMoS) supported on alumina. Their conventional preparation involves an incipient wetness impregnation of an aqueous solution of Mo/W and Ni/Co salts, and then activation by a sulfo-reductive agent (such as H2S/H2). To meet environmental regulations and improve the energy efficiency of hydrotreatment, permanent improvements on the performance of these catalytic systems are expected. This work is thus focused on the preparation of highly active hydrotreating catalysts through a controlled surface chemistry (CSC) approach; which involves the successive impregnation of Mo5+ and Ni2+ molecular precursors in an organic solvent on a thermally treated silica-alumina support. In the first part of this thesis, the active phase genesis of CSC and conventional Mo and NiMo catalysts is studied by in situ quick-XAS combined with various other techniques (chemometrics, XPS, EPR, STEM-HAADF, molecular modeling). We thus propose molecular structures from the oxide of supported Mo and Ni precursors up to the numerous intermediate sulfided species as a function of temperature. This multi-technique analysis enables first to reveal the specific features of the genesis of CSC and conventional catalysts which may explain their different catalytic activities. Then, it also reveals new insights into the mechanisms of Ni promoter incorporation into the NiMoS phase as a function of the preparation. In the second part, the feasibility of replacing Co and Ni as promoters is explored. Using the CSC method, we attempted to synthesize alternative catalysts of the form XYMoS ternary sulfides, where X and Y are 3d transition metals. As suggested by previous quantum simulations, certain XY formulations possibly reveal a synergy effect as observed in CoMoS and NiMoS active phases. The most promising formulations merit further investigations
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Shi, Zhengqi. "Development of Metal Sulfide Semiconductor Light Absorbers for Solar Cell Application." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1525474936984221.

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Books on the topic "Metal sulfide"

1

Friedrich, Günther H., and Peter M. Herzig, eds. Base Metal Sulfide Deposits in Sedimentary and Volcanic Environments. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-02538-3.

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Bhattacharyya, D. Sulfide precipitation of nickel and other heavy metals from single- and multi-metal systems. Cincinnati, OH: U.S. Environmental Protection Agency, Water Engineering Research Laboratory, 1986.

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Miron, Yael. Blasting hazards of gold mining in sulfide-bearing ore bodies. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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Smyres, G. A. Hydrochloric acid-oxygen leaching and metal recovery from copper-nickel bulk sulfide concentrate. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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More, Andrew Peter. Textural and microstructural studies of zinc sulfide and associated phases in certain base metal deposits. Birmingham: Aston University. Department of Geological Sciences, 1988.

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Welch, Michael James. Metal zoning, geochemistry and alteration of the archean, estrades Zn-Au massive sulfide deposit, northwestern Quebec, Canada. Sudbury, Ont: Laurentian University Press, 1995.

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Dumoulin, Julie A., and Alison B. Till. Reconstruction of a late Proterozoic to Devonian continental margin sequence, northern Alaska, its paleogeographic significance and contained base-metal sulfide deposits. Boulder, Colorado: The Geological Society of America, 2014.

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Lueck, Larry. Petrologic and geochemical characterization of the Red Dog and other base-metal sulfide and barite deposits in the Delong Mountains, western Brooks Range, Alaska. Fairbanks, Alaska: School of Mineral Engineering, University of Alaska-Fairbanks, 1986.

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DeWitt, Ed. Base- and precious-metal concentrations of early Proterozoic massive sulfide deposits in Arizona: Crustal and thermochemical controls of ore depositon. Washington, D.C: Geological Survey, 1995.

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Stanton, Mark R. Trace metal and acid-volatile sulfide concentrations in sediments from the Forest Queen Wetland near Silverton, Colorado: Implications for the removal of metals from acid drainage waters. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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Book chapters on the topic "Metal sulfide"

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Gates, B. C. "Metal Oxide and Metal Sulfide Catalysts." In Inorganic Reactions and Methods, 26–32. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145319.ch15.

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Rickard, David, and George W. Luther. "8. Metal Sulfide Complexes and Clusters." In Sulfide Mineralogy and Geochemistry, edited by David J. Vaughan, 421–504. Berlin, Boston: De Gruyter, 2006. http://dx.doi.org/10.1515/9781501509490-009.

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Jambor, John L., D. Kirk Nordstrom, and Charles N. Alpers. "6. Metal-sulfate Salts from Sulfide Mineral Oxidation." In Sulfate Minerals, edited by Charles N. Alpers, John L. Jambor, and D. Nordstrom, 303–50. Berlin, Boston: De Gruyter, 2001. http://dx.doi.org/10.1515/9781501508660-008.

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Ay, Hasan, and Fatih Sen. "Metal, Metal Oxides, and Metal Sulfide Roles in Fuel Cell." In Metal, Metal-Oxides and Metal Sulfides for Batteries, Fuel Cells, Solar Cells, Photocatalysis and Health Sensors, 115–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63791-0_4.

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Wright, K., and D. J. Vaughan. "Crystal Chemistry of Metal Sulfide Minerals." In Microscopic Properties and Processes in Minerals, 265–80. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4465-0_10.

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Kisch, H., W. Hetterich, and G. Twardzik. "Heterogeneous Photocatalysis by Metal Sulfide Semiconductors." In Photochemistry and Photophysics of Coordination Compounds, 301–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72666-8_55.

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Gerken, Michael. "Preparation of Transition Metal Sulfide Fluorides." In Efficient Preparations of Fluorine Compounds, 79–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118409466.ch14.

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Dance, Ian. "Computational Methods for Metal Sulfide Clusters." In ACS Symposium Series, 135–52. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0653.ch007.

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Yang, Jun, and Hui Liu. "Nanocomposites Consisting of Silver Sulfide and Noble Metals." In Metal-Based Composite Nanomaterials, 93–113. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12220-5_4.

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Suresh, R., Claudio Sandoval, Eimmy Ramirez, K. Giribabu, R. V. Mangalaraja, and Jorge Yáñez. "Electrochemical Sensors Based on Metal Oxide and Sulfide Nanostructures." In Metal, Metal-Oxides and Metal Sulfides for Batteries, Fuel Cells, Solar Cells, Photocatalysis and Health Sensors, 285–309. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63791-0_9.

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Conference papers on the topic "Metal sulfide"

1

Rasulova, Sitorabonu, and Vitaliy Guro. "KINETICS OF REAGENT OXIDATION OF MOLYBDENUM SULFIDE IN SULPHATE ELECTROLYTES." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.915.

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Pruseth, Kamal Lochan, and Biswajit Mishra. "Magmatic (?) Base Metal Sulfide Deposits." In Proceedings of the Workshop on Magmatic Ore Deposits. Geological Society of India, 2015. http://dx.doi.org/10.17491/cgsi/2014/63403.

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Kudryashov, N. A., A. A. Кutukov, and E. A. Mazur. "Metal hydrogen sulfide superconducting temperature calculation." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992561.

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Aldrich, James R. "Ferrous and Sulfide. A Proven Technology." In Annual Aerospace/Airline Plating and Metal Finishing Forum and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1986. http://dx.doi.org/10.4271/860709.

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Johnson, Curtis E., Deborah K. Hickey, and Daniel C. Harris. "Synthesis Of Metal Sulfide Powders From Organometallics." In 30th Annual Technical Symposium, edited by Robert W. Schwartz. SPIE, 1986. http://dx.doi.org/10.1117/12.936425.

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Gopal, Veena, and James A. Harrington. "Metal sulfide coatings for hollow glass waveguides." In Biomedical Optics 2003, edited by Israel Gannot. SPIE, 2003. http://dx.doi.org/10.1117/12.485407.

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Krunks, Malle, and Enn Mellikov. "Metal sulfide thin films by chemical spray pyrolysis." In Advanced Optical Materials and Devices, edited by Steponas P. Asmontas and Jonas Gradauskas. SPIE, 2001. http://dx.doi.org/10.1117/12.425472.

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Pedersen, Pal O., and James A. Harrington. "Characterization of metal-sulfide-coated hollow glass waveguides." In Biomedical Optics 2004, edited by Israel Gannot. SPIE, 2004. http://dx.doi.org/10.1117/12.532506.

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Lezal, Dimitrij, Jitka Pedlikova, and Marcel Poulain. "Sulfide and heavy metal oxide glasses for active fibers." In Lasers and Materials in Industry and Opto-Contact Workshop, edited by Mohammed Saad. SPIE, 1998. http://dx.doi.org/10.1117/12.323399.

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Lian, H. L., Q. Shen, Y. J. Fan, L. M. Wu, and Z. X. Sun. "Thermal Decomposition Mechanism of Metal Xanthate to Metal Sulfide Nanoparticles in Ammonia Solution." In The International Workshop on Materials, Chemistry and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007437402680275.

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Reports on the topic "Metal sulfide"

1

Marking, Gregory Allen. Studies of high temperature ternary phases in mixed-metal-rich early transition metal sulfide and phosphide systems. Office of Scientific and Technical Information (OSTI), January 1994. http://dx.doi.org/10.2172/10119308.

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Byron, J., E. Schetselaar, H. Gibson, S. Pehrsson, B. Lafrance, C. Devine, and D. Ames. 3D reconstruction of base metal zoning in the Flin Flon - Callinan-777 volcanogenic massive sulfide deposits, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293767.

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Franzen, H. F. The metal-rich sulfides and phosphides of the early transition metals. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/244545.

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Propp, W. A., T. E. Carleson, C. M. Wai, and S. Huang. Transport of metal sulfides in supercritical carbon dioxide. Office of Scientific and Technical Information (OSTI), May 1996. http://dx.doi.org/10.2172/274142.

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Tossell, John A. Theoretical Studies on Heavy Metal Sulfides in Solution. Office of Scientific and Technical Information (OSTI), October 2007. http://dx.doi.org/10.2172/1028651.

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Brossard, Thomas, James Byrnes, and Peter Tkac. Conversion of Uranium Metal to Uranyl Sulfate Solution. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1605197.

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Kanatzidis, Mercouri, Brian Riley, and Jaehun Chun. Novel Metal Sulfides to Achieve Effective Capture and Durable Consolidation of Radionuclides. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1333915.

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Stender, David, Wendy J. Powers, Colin Johnson, Jay D. Harmon, and Kris Kohl. Soybean Meal Inclusion Rate Effects on Odor Intensity, Hydrogen Sulfide and Ammonia in Commercial Swine Production Units. Ames (Iowa): Iowa State University, January 2007. http://dx.doi.org/10.31274/ans_air-180814-261.

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Serne, R. J., W. J. Martin, V. L. LeGore, C. W. Lindenmeier, S. B. McLaurine, P. F. C. Martin, and R. O. Lokken. Leach tests on grouts made with actual and trace metal-spiked synthetic phosphate/sulfate waste. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5391748.

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Patton, Gregory W., and Eric A. Crecelius. Simultaneously Extracted Metals/Acid-Volatile Sulfide and Total Metals in Surface Sediment from the Hanford Reach of the Columbia River and the Lower Snake River. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/781075.

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