Enrichment of trace amounts of gold, silver, palladium and platinum by precipitate flotation

1990 ◽  
Vol 336 (2) ◽  
pp. 120-123 ◽  
Author(s):  
Xiaojun Wu ◽  
Shu-Chuan Liang
Keyword(s):  
Gold Silver ◽  
Silver Palladium

Preconcentration of gold, silver, palladium, platinum, and ruthenium with organophosphorus extractants

2009 ◽  
Vol 82 (2) ◽  
pp. 183-189 ◽  
Author(s):  
V. I. Men’shikov ◽  
I. Yu. Voronova ◽  
O. A. Proidakova ◽  
S. F. Malysheva ◽  
N. I. Ivanova ◽  
...  
Keyword(s):  
Gold Silver ◽  
Silver Palladium ◽  
Organophosphorus Extractants ◽  
Palladium Platinum

scholarly journals Synthesis and Bactericidal Properties of Hyaluronic Acid Doped with Metal Nanoparticles

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Galo Cárdenas-Triviño ◽  
Macarena Ruiz-Parra ◽  
Luis Vergara-González ◽  
Javier Ojeda-Oyarzún ◽  
Guillermo Solorzano
Keyword(s):  
Hyaluronic Acid ◽  
Antibacterial Properties ◽  
Culture Collection ◽  
Bacterial Strains ◽  
Gamma Glutamyl Transpeptidase ◽  
Transmission Electron ◽  
Bactericidal Properties ◽  
Gold Silver ◽  
Ft Ir ◽  
Silver Palladium

A study on the nanoparticles size and the antibacterial properties of hyaluronic acid (HA) doped with nanoparticles is reported. Nanoparticles from gold, silver, copper, and silver palladium with HA support were performed. The solvated metal atom dispersion (SMAD) method with 2-propanol and HA was used. High-resolution transmission electron microscopy (HRTEM), infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA) were conducted. The average sizes of nanoclusters were as follows: HA-Au = 17.88 nm; HA-Ag = 50.41 nm; HA-Cu = 13.33 nm; and HA-AgPd = 33.22 nm. The antibacterial activity of solutions and films containing nanoparticles against American Type Culture Collection (ATCC) bacterial strainsEscherichia coli(EC),Staphylococcus aureus(SA),Staphylococcus epidermidis(SE), andPseudomonas aeruginosa(PA) was determined. Inhibition was observed for HA-Ag, HA-Cu, and HA-AgPd. Toxicological tests were performed in rats that were injected intraperitoneally with two concentrations of gold, copper, silver, and silver-palladium nanoparticles. No alterations in hepatic parameters, including ALT (alanine aminotransferase), GGT (gamma-glutamyl transpeptidase) bilirubin, and albumin, were observed after 14 days. These films could be used as promoters of skin recovery and Grades I and II cutaneous burns and as scaffolds.

Metallic nanoparticles made in flow and their catalytic applications in organic synthesis

2014 ◽  
Vol 3 (1) ◽  
pp. 65-86 ◽  
Author(s):  
Elnaz Shahbazali ◽  
Volker Hessel ◽  
Timothy Noël ◽  
Qi Wang
Keyword(s):  
Metal Nanoparticles ◽  
Organic Synthesis ◽  
Metallic Nanoparticles ◽  
Noble Metal Nanoparticles ◽  
Synthesis Methods ◽  
Highly Active ◽  
Operational Window ◽  
Gold Silver ◽  
Recent Developments ◽  
Silver Palladium

AbstractThis paper reviews recent developments on the synthesis of noble metal nanoparticles in micro and millifluidic devices and their catalytic application in organic flow synthesis. A variety of synthesis methods using microfluidics is presented for gold, silver, palladium, platinum, and copper nanoparticles, including the formation in single-phase flows and multiphase flows. In the field of organic chemistry, metal nanoparticles can be used as catalysts. This can lead to remarkably improved reaction performance in terms of minimizing the reaction time and higher yields. In this context, various applications of those metal nanoparticles as catalysts in microfluidic devices are highlighted at selected examples. As a new direction and operational window, nanocatalysts may be synthesized in situ in flow and directly utilized in an organic synthesis. This allows making use of highly active, yet instable catalyst species, which may only have a very short life of a few seconds – a type of flashed nanocatalyst organic synthesis.

scholarly journals Au-Ag-Pd-Pt mineralization in sedimentary rocks associated with Triassic carbonaceous silicites of Sikhote-Alin

LITOSFERA ◽  
2018 ◽  
pp. 892-913
Author(s):  
Valentin T. Kazachenko ◽  
Elena V. Perevoznikova
Keyword(s):  
Organic Matter ◽  
Intermetallic Compounds ◽  
Sedimentary Rocks ◽  
Precious Metals ◽  
Contact Metamorphism ◽  
Sikhote Alin ◽  
Gold Silver ◽  
Silver Palladium ◽  
Platinum Mineralization ◽  
Palladium Platinum

Subject.The paper is devoted to the study of the gold-silver-palladium-platinum mineralization of the streaky systems in the sedimentary rocks associated within the Triassic carbonaceous silicites of the Taukhinsky and Samarkinsky terranes of the Sikhote-Alin.Materials and methods.In the process of investigations we studied the metamorphosed carbonaceous siliceous-clay rocks and systems of the mineralized fractures in the Triassic siliceous-clay and siliceous (including jaspers) rocks of Shirokopadninskaya, Vysokogorskaya and Gornaya areas, as well as in the sandstones (unclarified age) of Gornaya area. The samples for the analytical study were taken with the lump way. To estimate the content of precious metals in the rocks, cut by the systems of the mineralized fractures, we used the fire assay and atomic-absorption methods. The analyses of minerals (in polished sections) have been done using the JXA-5A and JXA8100 microanalysers.Results.The gold-silver-palladium-platinum mineralization in the siliceous and clay-siliceous rocks, as well as in the sandstones is restricted to the systems of the mineralized fractures and by many features are analogous to the precious-metal mineralization of the black-shale formations. It is represented by native forms, disordered solid solutions, and intermetallic compounds of different metals. The specificity of the Au-Ag-Pd-Pt mineralization is a wide distribution of copper gold, Ni-, Cu-, and Pbbearing gold, and Zn-bearing platinum. Native elements and intermetallic compounds, including those of precious metals, are not rarely associated with the organic matter testifying to the active participation of carbon and, probably, hydrogen that provided the high- and ultra-reduction character of the processes of mineral formation.Conclusions.The presence of the mineral forms of different maximum reduced metals is caused by the influence of the organic matter of the Triassic carbonaceous silicites. This consisted in the removal of the most volatile components, and first of all the poorly bound water and hydrocarbons from the carbonaceous rocks through the contact metamorphism related with the injection of the granitoid intrusions of Cretaceous plutonic and volcanoplutonic belts.

scholarly journals DESIGNING OF NANOCOMPOSITE MODEL STRUCTURE USING GLYCITEIN AND GENISTEIN WITH TWELVE DIFFERENT METAL ATOMS USING IN SILICO METHOD

2021 ◽  
Vol 8 (11) ◽  
pp. 14-22
Author(s):  
Doyel Chatterjee ◽  
Sukanya Basu Mallick ◽  
Debraj Hazra ◽  
Rajat Pal
Keyword(s):  
Binding Site ◽  
Energy Levels ◽  
Metal Atoms ◽  
Gold Silver ◽  
Iron Nickel ◽  
Silver Palladium ◽  
Least Energy ◽  
Saturated Structure ◽  
Selection Of ◽  
Palladium Platinum

Nanocomposite formulation is still in its evolving state. However due to its significant therapeutic applications it has grabbed the attention of many researchers. Isoflavonewhich is widely found in soy products have tremendous medicinal propertieswhen it interacts with nanoparticles can become a boon. Hence in this study, we are reporting the interaction properties/patterns of two ubiquitous flavones namelyGlycitein and Genistein forming a nanocomposite model with 12 different metals such as Gold, Silver, Palladium, Platinum, Ruthenium, Rhodium, Cadmium, Iron, Nickel, Zinc, Copper and Antimony based ontheir potency to form nanoparticles. To mimic the Nanocomposite, model the formulation was conducted in Avogadro Software for windows. Glycitein and Genistein create a possibility of selecting the most suitable -OH position that would serve as the binding site. On selection of the appropriate binding site the interaction amid two molecules of glycitein and genistein placed sidewise held together by above-mentioned metals also surrounded by the same metal on another vacant -OH position forming a close saturated structure subjected for interaction. Based on predominantly energy levels the least energy obtained model was Cadmium and the peak procured by Antimony making it least stable and unfavorable for the perceived result.

scholarly journals Stabilization of 4H hexagonal phase in gold nanoribbons

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhanxi Fan ◽  
Michel Bosman ◽  
Xiao Huang ◽  
Ding Huang ◽  
Yi Yu ◽  
...  
Keyword(s):  
Metastable Phase ◽  
Hexagonal Phase ◽  
High Yield ◽  
Ambient Conditions ◽  
Solution Synthesis ◽  
Hexagonal Polytype ◽  
Gold Silver ◽  
The Face ◽  
Cubic Structure ◽  
Silver Palladium

Abstract Gold, silver, platinum and palladium typically crystallize with the face-centred cubic structure. Here we report the high-yield solution synthesis of gold nanoribbons in the 4H hexagonal polytype, a previously unreported metastable phase of gold. These gold nanoribbons undergo a phase transition from the original 4H hexagonal to face-centred cubic structure on ligand exchange under ambient conditions. Using monochromated electron energy-loss spectroscopy, the strong infrared plasmon absorption of single 4H gold nanoribbons is observed. Furthermore, the 4H hexagonal phases of silver, palladium and platinum can be readily stabilized through direct epitaxial growth of these metals on the 4H gold nanoribbon surface. Our findings may open up new strategies for the crystal phase-controlled synthesis of advanced noble metal nanomaterials.

scholarly journals A case of pigmentation of the mucous membrane associated with gold-silver-palladium alloy.

1992 ◽  
Vol 38 (10) ◽  
pp. 1564-1565
Author(s):  
Shinichiro TERASAKI ◽  
Chihiro KOGA ◽  
Shisei TOYOFUKU ◽  
Tadamitsu KAMEYAMA ◽  
Keiichiro SATOU
Keyword(s):  
Mucous Membrane ◽  
Palladium Alloy ◽  
Gold Silver ◽  
Silver Palladium
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