You searched for subject:(copper).
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University of Georgia
1.
Thambidurai, Chandru.
Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD).
Degree: PhD, Chemistry, 2009, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/thambidurai_chandru_200912_phd 
► The formation of metal nanofilms using Electrochemical ALD is discussed. Surface Limited Redox Reactions (SLRR) were used to form thin film deposits by ALD. The…
(more)
▼ The formation of metal nanofilms using Electrochemical ALD is discussed. Surface Limited Redox Reactions (SLRR) were used to form thin film deposits by ALD. The SLRR involves the underpotential deposition of an atomic layer of a less noble metal (sacrificial metal). This is then replaced in a solution of cations of the desired element, a more noble element. Lead was used as a sacrificial metal in the present studies. Cyclic Voltammetry was used to investigate the optimum deposition potential for Pb. An automated flow cell deposition system was employed to grow metal nano films. No Pb was present in the thin film was evident with electron probe microanalysis (EPMA). It was also shown that the Pb % in a deposit increased, as more negative Pb deposition potential were used. Deposits were characterized using X-ray diffraction (XRD), EPMA, scanning electron micrscopy (SEM), Atomic force microscopy and scanning tunneling microscopy (STM).
Advisors/Committee Members: John Stickney.
Subjects/Keywords: Copper
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APA (6th Edition):
Thambidurai, C. (2009). Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD). (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/thambidurai_chandru_200912_phd
Chicago Manual of Style (16th Edition):
Thambidurai, Chandru. “Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD).” 2009. Doctoral Dissertation, University of Georgia. Accessed December 14, 2019.
http://purl.galileo.usg.edu/uga_etd/thambidurai_chandru_200912_phd.
MLA Handbook (7th Edition):
Thambidurai, Chandru. “Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD).” 2009. Web. 14 Dec 2019.
Vancouver:
Thambidurai C. Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD). [Internet] [Doctoral dissertation]. University of Georgia; 2009. [cited 2019 Dec 14].
Available from: http://purl.galileo.usg.edu/uga_etd/thambidurai_chandru_200912_phd.
Council of Science Editors:
Thambidurai C. Electrodeposition of thin films by electrochemical - atomic layer deposition (ALD). [Doctoral Dissertation]. University of Georgia; 2009. Available from: http://purl.galileo.usg.edu/uga_etd/thambidurai_chandru_200912_phd
University of Georgia
2.
Marchant, Matthew Ray.
The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals.
Degree: MS, Animal Science, 2010, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/marchant_matthew_r_201005_ms
► In this study, experiment 1 examined the growth characteristics of pigs fed different levels of organic Zn coupled with CuSO4 compared to those fed treatments…
(more)
▼ In this study, experiment 1 examined the growth characteristics of pigs fed different levels of organic Zn coupled with CuSO4 compared to those fed treatments containing inorganic Zn from ZnO and CuSO4. Experiment 2 determined the digestibility of
copper and zinc in nursery pigs fed diets containing 4 or 100 ppm Cu as CuSO4 and 60 ppm Zn from ZnO or 75 ppm Zn as organic zinc. Data from experiment 1 indicated that pigs fed 75 ppm of organic Zn have performance similar to those fed 100 ppm ZnO and that the addition of 100 ppm organic Zn resulted in decreased performance compared to those pigs fed 100 ppm ZnO. Experiment 2 saw the benefit of 100 ppm added Cu on ADG and ADF compared to 4 ppm Cu yet, no differences in 60 ppm inorganic Zn and 75 ppm organic Zn on growth characteristics were observed. 75 ppm organic Zn increased intake 21% over 60 ppm inorganic Zn. 100 ppm Cu increased Ca and Cu intake, however 4 ppm Cu increased retention by 45%.
Advisors/Committee Members: Robert C. Dove.
Subjects/Keywords: Copper
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APA (6th Edition):
Marchant, M. R. (2010). The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/marchant_matthew_r_201005_ms
Chicago Manual of Style (16th Edition):
Marchant, Matthew Ray. “The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals.” 2010. Masters Thesis, University of Georgia. Accessed December 14, 2019.
http://purl.galileo.usg.edu/uga_etd/marchant_matthew_r_201005_ms.
MLA Handbook (7th Edition):
Marchant, Matthew Ray. “The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals.” 2010. Web. 14 Dec 2019.
Vancouver:
Marchant MR. The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals. [Internet] [Masters thesis]. University of Georgia; 2010. [cited 2019 Dec 14].
Available from: http://purl.galileo.usg.edu/uga_etd/marchant_matthew_r_201005_ms.
Council of Science Editors:
Marchant MR. The evaluation of the additive effect of zinc and copper supplementation from organic and inorganic sources on growth performance of nursery pigs and the digestibility of those minerals. [Masters Thesis]. University of Georgia; 2010. Available from: http://purl.galileo.usg.edu/uga_etd/marchant_matthew_r_201005_ms
Oregon State University
3.
Sprick, Matthew S.
Analytical determination of copper speciation in Oregon highway runoff.
Degree: MS, Chemical Engineering, 2010, Oregon State University
URL: http://hdl.handle.net/1957/13876
► Low concentrations of dissolved copper have been shown to adversely affect the olfactory system of endangered salmonids, impairing their ability to avoid predators and likely…
(more)
▼ Low concentrations of dissolved
copper have been shown to adversely
affect the olfactory system of endangered salmonids, impairing their ability to avoid
predators and likely increasing predation. It is believed that only the free ionic
(Cu2+
free) and weakly complexed forms are bioavailable to organisms; these forms
typically account for a small fraction of the total dissolved
copper. To determine the
threat of
copper to salmonids, the speciation of
copper in aqueous environments is
essential.
Copper speciation has been examined in freshwater, seawater, estuaries, and
rainwater. However, no such studies have focused on stormwater, a major source of
dissolved
copper in natural water bodies. To bridge this gap in knowledge,
competitive ligand exchange – adsorptive cathodic stripping voltammetry (CLEACSV)
techniques developed for seawater were adapted to stormwater. CLE-ACSV
is unique among speciation techniques in that it allows the characterization of the
ligands in the system as well as free
copper concentrations. Major alterations of
seawater CLE-ACSV techniques include the shift to a lower pH (6.80) and the
addition of an electrolyte to increase solution ionic strength to 0.05M. The results of
this research show that free
copper concentrations at the monitored sites ranges from
10−13.49 to 10−6.74 M. Additionally, free
copper concentrations are best correlated with
dissolved
copper and hardness levels. Ligand concentrations correlate with dissolved
organic carbon (DOC) measurements and (along with
copper-ligand stability
constants) vary widely within and between sites. Finally, modeled Cu2+
free
concentrations overestimate analytically determined concentrations.
Advisors/Committee Members: Nason, Jeff (advisor), Nelson, Pete (committee member).
Subjects/Keywords: Copper; Copper – Speciation – Oregon
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APA (6th Edition):
Sprick, M. S. (2010). Analytical determination of copper speciation in Oregon highway runoff. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13876
Chicago Manual of Style (16th Edition):
Sprick, Matthew S. “Analytical determination of copper speciation in Oregon highway runoff.” 2010. Masters Thesis, Oregon State University. Accessed December 14, 2019.
http://hdl.handle.net/1957/13876.
MLA Handbook (7th Edition):
Sprick, Matthew S. “Analytical determination of copper speciation in Oregon highway runoff.” 2010. Web. 14 Dec 2019.
Vancouver:
Sprick MS. Analytical determination of copper speciation in Oregon highway runoff. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1957/13876.
Council of Science Editors:
Sprick MS. Analytical determination of copper speciation in Oregon highway runoff. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/13876
University of Utah
4.
Huang, Xiaosong.
Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment.
Degree: PhD, Pathology;, 2010, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1204/rec/355
► Cell differentiation is influenced by a combination of cues from both extracellular and intracellular sources. Recent advances in the regulation of hematopoiesis have focused on…
(more)
▼ Cell differentiation is influenced by a combination of cues from both extracellular and intracellular sources. Recent advances in the regulation of hematopoiesis have focused on the roles of the growth factors, cytokines, transcription factors and microRNAs; little attention has been given to the role of cellular metabolism. In the first part of this dissertation, I explored the idea that an essential cellular nutrient, copper (Cu), is an active component of cell fate regulators that influence hematopoietic progenitor cell differentiation. I showed that reducing cellular Cu content by exposing the cells to the Cu chelator tetraethylenepentamine (TEPA) enhanced the generation or maintenance of erythroid progenitor cells from multipotent progenitor cells in culture. I also provided evidence suggesting that this effect is likely due to the modulation of cellular energy metabolism by cell Cu level. In the second part of this dissertation, I investigated the effects of modulating erythropoietin receptor (EPOR) signaling intensity on mouse trilineage hematopoietic engraftment and proliferation of hematopoietic stem/progenitor cells (HSC/HPCs). I showed that neither increasing nor reducing EpoR signaling intensity influence long-term leukocyte engraftment, an indication of HSC function. I confirmed the essential role of EpoR on erythropoiesis. I also provide evidence suggesting a potential role for EpoR in megakaryopoiesis. I also demonstrated that multipotent progenitor cells with naturally-expressed hyperactive EpoR can proliferate and differentiate in response to Epo stimulation alone.
Subjects/Keywords: Hematopoiesis; Copper
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APA (6th Edition):
Huang, X. (2010). Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1204/rec/355
Chicago Manual of Style (16th Edition):
Huang, Xiaosong. “Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment.” 2010. Doctoral Dissertation, University of Utah. Accessed December 14, 2019.
http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1204/rec/355.
MLA Handbook (7th Edition):
Huang, Xiaosong. “Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment.” 2010. Web. 14 Dec 2019.
Vancouver:
Huang X. Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment. [Internet] [Doctoral dissertation]. University of Utah; 2010. [cited 2019 Dec 14].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1204/rec/355.
Council of Science Editors:
Huang X. Distinct Roles of Cellular Copper and Erythropoietin Receptor on Hematopoietic Engraftment. [Doctoral Dissertation]. University of Utah; 2010. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1204/rec/355
University of Namibia
5.
Likius Daniel Shipwiisho.
The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
.
Degree: 2009, University of Namibia
URL: http://hdl.handle.net/11070/453
► Abstract provided by author; The synthesis and characterization,spectroscopic, and biological studies of 2-acetylferrocenyl-4-phenylthiosemicarbazone, 2-acetylferrocenyl-4-methylthiosemicarbazone,2-acetylpyridine-2-thiophenecarboxylsemicarbazone and 2-acetylferrocenyl-2-thiophenecarboxylsemicarbazone with copper(II) chloride are reported here. The ligands were…
(more)
▼ Abstract provided by author; The synthesis and characterization,spectroscopic, and biological studies of 2-acetylferrocenyl-4-phenylthiosemicarbazone, 2-acetylferrocenyl-4-methylthiosemicarbazone,2-acetylpyridine-2-thiophenecarboxylsemicarbazone and 2-acetylferrocenyl-2-thiophenecarboxylsemicarbazone with
copper(II) chloride are reported here. The ligands were synthesized by condensation reaction of appropriate carbonyl and amine compounds. The reactions were carried out in the presence of acetic acid. The complexes were characterized by means of Elemental Analysis (EA), Fourier Transform Infrared (FT-IR) spectroscopy, Nuclear Magnetic Resonance (1HNMR and 13CNMR) spectroscopy. The metal complexes and their corresponding ligands were tested against malaria parasites. It was found that the
copper complexes synthesized are more biologically active then their corresponding ligands.
Advisors/Committee Members: (advisor).
Subjects/Keywords: Copper compounds
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APA (6th Edition):
Shipwiisho, L. D. (2009). The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
. (Thesis). University of Namibia. Retrieved from http://hdl.handle.net/11070/453
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shipwiisho, Likius Daniel. “The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
.” 2009. Thesis, University of Namibia. Accessed December 14, 2019.
http://hdl.handle.net/11070/453.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shipwiisho, Likius Daniel. “The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
.” 2009. Web. 14 Dec 2019.
Vancouver:
Shipwiisho LD. The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
. [Internet] [Thesis]. University of Namibia; 2009. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11070/453.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shipwiisho LD. The Synthesis and characterization of copper(II) complexes containing thiosemicarbazone and semicarbazone ligands derived from Ferrocene and pyridyl fragments
. [Thesis]. University of Namibia; 2009. Available from: http://hdl.handle.net/11070/453
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
6.
Marsh, Thomas Parker.
A cerometric method for determination of copper in Paris green and ores.
Degree: MA, Chemistry, 1938, Oregon State University
URL: http://hdl.handle.net/1957/52468
Subjects/Keywords: Copper
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APA (6th Edition):
Marsh, T. P. (1938). A cerometric method for determination of copper in Paris green and ores. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/52468
Chicago Manual of Style (16th Edition):
Marsh, Thomas Parker. “A cerometric method for determination of copper in Paris green and ores.” 1938. Masters Thesis, Oregon State University. Accessed December 14, 2019.
http://hdl.handle.net/1957/52468.
MLA Handbook (7th Edition):
Marsh, Thomas Parker. “A cerometric method for determination of copper in Paris green and ores.” 1938. Web. 14 Dec 2019.
Vancouver:
Marsh TP. A cerometric method for determination of copper in Paris green and ores. [Internet] [Masters thesis]. Oregon State University; 1938. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1957/52468.
Council of Science Editors:
Marsh TP. A cerometric method for determination of copper in Paris green and ores. [Masters Thesis]. Oregon State University; 1938. Available from: http://hdl.handle.net/1957/52468
7.
Savina, Romain.
Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties.
Degree: Docteur es, Mécanique et matériaux, 2014, Paris 13
URL: http://www.theses.fr/2014PA132043
► Ce travail s'inscrit dans l'activité de production de câbles électriques en cuivre par l'entreprise NEXANS. La coulée continue, située sur le site de Lens, permet…
(more)
▼ Ce travail s'inscrit dans l'activité de production de câbles électriques en cuivre par l'entreprise NEXANS. La coulée continue, située sur le site de Lens, permet d'obtenir des demiproduits se présentant sous forme de fils de cuivre de diamètre 8mm. Si à l’origine ce genre de système de production utilise du cuivre « pur », qualifié d’ETP-1 (pureté >99,99%), aussi appelé cathodes électrolytiques, afin d’obtenir du fil de cuivre, ces derniers années, la coulée continue de Lens a élargi son activité vers le recyclage en introduisant des déchets riches en cuivre sur leur système. On distingue ainsi deux grandes familles de demi-produits ; la première, classée ETP-1, obtenue à partir de cuivre « pur » (Cu-ETP-1), et la deuxième, classée ETP-A, obtenue en introduisant un certain pourcentage de cuivre issu de déchets qualifiés de propres (déchets relativement purs). Cependant, dans cette optique environnementale et économique forte, le retour d'expérience de la chaîne de production a montré ces dernières années des problèmes de fissuration à chaud lors de l'élaboration des demi-produits. Ces problèmes concernent principalement le cuivre ETP-A, donc a priori le cuivre le plus riche en impuretés. Ainsi ces travaux de thèse ont pour but d’expliquer les raisons de ce problème sur la coulée continue en identifiant le(s) facteur(s) responsable(s) et en expliquant leur rôle sur le(s) mécanisme(s) de fissuration. Afin de répondre à cette problématique, après avoir étudié l’influence de l’oxygène et du plomb sur la microstructure par l’intermédiaire des diagrammes de phases binaire Cu-O et ternaire Cu-O-Pb, nous concentrons notre étude sur l’influence de ces impuretés sur les propriétés mécaniques du cuivre. Des essais de traction in situ au Microscope Electronique à Balayage ont été réalisés sur des échantillons à différentes compositions chimiques et à différentes températures afin d’observer leur évolution microstructurale au cours de la déformation tout en reproduisant le phénomène de fissuration observé sur le système de production. Au préalable de chaque essai de traction, des analyses EBSD sont effectuées afin de pouvoir déterminer la localisation de l’amorçage de fissures et d’acquérir de nombreux paramètres pouvant jouer un rôle sur les propriétés mécaniques (texture, facteur de Schmid…). Ces nombreux essais montrent des différences notables de propriétés mécaniques et de mécanismes de fissuration en fonction de nombreux paramètres que nous identifions (température, état de porosité, désorientation associée aux joints de grains, état de précipitation…).
This study takes place in the context of electric wires production using waste copper. Oxygen and sometimes lead are present in small amount in these products. We decide to study their influence on the microstructure and mechanical properties. After studying the influence of oxygen and lead on the microstructure using the binary phase diagram Cu-O and the ternary phase diagram Cu-O-Pb, we focused our work on the influence of these impurities on mechanical properties.…
Advisors/Committee Members: Bacroix, Brigitte (thesis director), Grégori, Fabienne (thesis director).
Subjects/Keywords: Cuivre; Copper
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APA (6th Edition):
Savina, R. (2014). Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties. (Doctoral Dissertation). Paris 13. Retrieved from http://www.theses.fr/2014PA132043
Chicago Manual of Style (16th Edition):
Savina, Romain. “Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties.” 2014. Doctoral Dissertation, Paris 13. Accessed December 14, 2019.
http://www.theses.fr/2014PA132043.
MLA Handbook (7th Edition):
Savina, Romain. “Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties.” 2014. Web. 14 Dec 2019.
Vancouver:
Savina R. Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties. [Internet] [Doctoral dissertation]. Paris 13; 2014. [cited 2019 Dec 14].
Available from: http://www.theses.fr/2014PA132043.
Council of Science Editors:
Savina R. Etude de l’influence des impuretés dans des microalliages de cuivre sur leurs microstructures et leurs propriétés mécaniques : Study of the influence of impurities in microalloys copper on microstructure and mechanical properties. [Doctoral Dissertation]. Paris 13; 2014. Available from: http://www.theses.fr/2014PA132043
8.
Gebregziabiher, Daniel Kebreab.
Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition.
Degree: PhD, Chemistry, 2012, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/gebregziabiher_daniel_k_201212_phd
► This dissertation describes the growth of nano films by electrochemical methods in an ultrahigh vacuum system (UHV) that is compatible with electrochemical deposition process. The…
(more)
▼ This dissertation describes the growth of nano films by electrochemical methods in an ultrahigh vacuum system (UHV) that is compatible with electrochemical deposition process. The UHV system was equipped with surface analysis techniques such as Auger electron spectroscopy (AES), low energy electron diffraction optics (LEED) and X-ray photoelectron spectroscopy (XPS). The first part of this dissertation deals with the eletrodeposition of
copper (Cu) nanofilms as seed layers on ruthenium (Ru) barrier layer for the metallization of integrated circuits. The Cu nano film was deposited by using lead (Pb) as a sacrificial element. A Pb UPD was deposited and this UPD was exchanged for Cu by flowing a solution of Cu+2 ions at open circuit potential in a redox replacement reaction. Since Cu is more noble than Pb, the Cu ions take electrons from Pb to be deposited as Cu atoms. The process should ideally result in the formation of only an atomic layer of Cu. This constituted one deposition cycle and the cycle was repeated several times to grow the Cu nano film. As a continuation of this study, Cu surface passivation was investigated by depositing atomic layers (AL) of different elements on Cu(111). The elements investigated for the passivation of Cu from oxidation included selenium (Se), iodine (I) and tellurium (Te). The purpose of this study was to protect Cu surface from contamination between solutions in a Fab line. The Se, I and Te modified Cu(111) was exposed to ambient air, solution vapors and oxygen and it was concluded that an atomic layer of Te protects the Cu(111) surface the best out of the investigated elements.
The second part of this dissertation deals with electrodeposition of germanium (Ge), a semiconductor, from an aqueous solution of Ge. The composition of the deposits was studied using AES and the surfaces were characterized using STM. Analytical techniques such as cyclic voltammetry (CV) and electrochemical quartz microbalance (EQCM) were used to follow the electrodeposition process. It was concluded that the electrochemical deposition of Ge from an aqueous solution was self-limiting even though bulk deposition potentials were used. At very negative potentials Ge forms a germanium hydride passivating layer.
Advisors/Committee Members: John Stickney.
Subjects/Keywords: Copper
…2
ELECTROCHEMICAL ATOMIC LAYER DEPOSITION OF COPPER
NANO FILMS ON RUTHENIUM… …resistivity when compared to Ta/TaN
and its low solubility in copper makes it a candidate for Cu… …can
prevent copper diffusion up to a temperature of 4500C [41] and Arunagiri et al… …Soo et al. reported that ALD-Ru (4nm)/ALD-TaCN (2nm) prevented copper… …diffusion up to 5500C and increasing the ALD-Ru to 12nm prevented the diffusion of
copper up to a…
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APA (6th Edition):
Gebregziabiher, D. K. (2012). Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/gebregziabiher_daniel_k_201212_phd
Chicago Manual of Style (16th Edition):
Gebregziabiher, Daniel Kebreab. “Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition.” 2012. Doctoral Dissertation, University of Georgia. Accessed December 14, 2019.
http://purl.galileo.usg.edu/uga_etd/gebregziabiher_daniel_k_201212_phd.
MLA Handbook (7th Edition):
Gebregziabiher, Daniel Kebreab. “Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition.” 2012. Web. 14 Dec 2019.
Vancouver:
Gebregziabiher DK. Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition. [Internet] [Doctoral dissertation]. University of Georgia; 2012. [cited 2019 Dec 14].
Available from: http://purl.galileo.usg.edu/uga_etd/gebregziabiher_daniel_k_201212_phd.
Council of Science Editors:
Gebregziabiher DK. Ultrahigh vacuum electrochemical studies of metals and semiconductor deposition. [Doctoral Dissertation]. University of Georgia; 2012. Available from: http://purl.galileo.usg.edu/uga_etd/gebregziabiher_daniel_k_201212_phd
University of British Columbia
9.
Hughes, Garry Maurice.
The recovery of copper from synthetic leach solutions with iron powder
.
Degree: 1970, University of British Columbia
URL: http://hdl.handle.net/2429/34883
► Recent increases in the production of copper by acid-leaching techniques have depleted the supply of iron and de-tinned cans as sources of precipitant for copper…
(more)
▼ Recent increases in the production of copper by acid-leaching techniques have depleted the supply of iron and de-tinned cans as sources of precipitant for copper from solution. Previous investigators of the iron cementation process have indicated that high purity iron powder, although more costly than detinned cans, has several properties which render it a potential precipitant of copper from leach solutions but few data have been published on the subject. The purpose of this thesis is to investigate the variables encountered in the cementation of copper with iron powder and to obtain data to substantiate indications that the iron consumption could be reduced and a higher grade cement copper could be produced which would compensate, at least in part, for the higher cost of the precipitant.
A vertical column mounted on an inverted cone was used as the reaction vessel in the experiments. The pregnant solution was forced into the precipitator through the apex of the cone and the iron powder was added from the top of the column through a small diameter tube. The copper product was removed from the reaction vessel by the effluent solution and collected in a settling tank. Several series of experiments were conducted.to study the influence of variations in the velocity of solution flow through the precipitator, the concentrations of free acid ferrous and ferric ion in the pregnant solution, and the temperature of the pregnant solution on the iron consumption and the grade of the cement copper product.
A velocity of solution flow in the column of approximately one centimeter per second was found to be suitable for iron powders retained on a 200 mesh screen. The capacity of the precipitator was reduced considerably with iron powder passing through a 200 mesh screen because iron of that size fraction was easily forced to overflow the precipitator before cementation.is complete. Neither temperature nor ferrous ion concentrations within the normal ranges of operation had any significant effect on the cementation process. Free acid concentrations up to twenty grams per liter were tested with no significant increase in iron consumption. The presence of ferric ion in solution during cementation enhanced the consumption of excess iron appreciably. Excess iron consumption was due to the reaction between metallic copper and ferric ions. The cupric ion produced in the reaction consumed additional iron by the normal cementation reaction. The reaction between metallic iron and ferric ions was not a major contributor to excess iron consumption. The consumption of ferric ion was not excessive at the beginning of experiments, when the surface area of metallic iron was at a maximum, but increased in approximate proportion to the increase in surface area, of metallic copper in the reaction vessel. Although the experiments were conducted with batch additions of iron the results indicated that the cone-column precipitator could be operated continuously by adding precipitant at a rate equal to its consumption. With continuous operation the…
Subjects/Keywords: Copper
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APA (6th Edition):
Hughes, G. M. (1970). The recovery of copper from synthetic leach solutions with iron powder
. (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/34883
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hughes, Garry Maurice. “The recovery of copper from synthetic leach solutions with iron powder
.” 1970. Thesis, University of British Columbia. Accessed December 14, 2019.
http://hdl.handle.net/2429/34883.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hughes, Garry Maurice. “The recovery of copper from synthetic leach solutions with iron powder
.” 1970. Web. 14 Dec 2019.
Vancouver:
Hughes GM. The recovery of copper from synthetic leach solutions with iron powder
. [Internet] [Thesis]. University of British Columbia; 1970. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2429/34883.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hughes GM. The recovery of copper from synthetic leach solutions with iron powder
. [Thesis]. University of British Columbia; 1970. Available from: http://hdl.handle.net/2429/34883
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
10.
Neisen, Benjamin.
Modeling the Active Sites of Copper Monooxygenase Enzymes.
Degree: PhD, Chemistry, 2017, University of Minnesota
URL: http://hdl.handle.net/11299/206640
► Mechanistic investigation of copper-oxygen intermediates relevant to the oxygenation reactions of copper monooxygenase enzymes is a long-standing goal of bioinorganic chemists. To elucidate and understand…
(more)
▼ Mechanistic investigation of copper-oxygen intermediates relevant to the oxygenation reactions of copper monooxygenase enzymes is a long-standing goal of bioinorganic chemists. To elucidate and understand the key species in copper monooxygenase pathways, small molecule synthetic chemistry has been employed to discretely generate and characterize individual species of interest. In Chapter 1, previous enzymatic and modeling work with respect to copper monooxygenase chemistry is discussed and current mechanistic proposals are explored in detail. Chapter 2 describes modeling studies of monocopper sites and the influence of secondary sphere hydrogen bonding interactions on their redox behavior. A series of monocopper complexes with secondary sphere hydrogen bond interactions were determined to result in large increases of the electrochemical potentials of the CuIII/CuII redox couple when compared to non-hydrogen bound analogs. The hydrogen bonding model systems provide evidence for the structure-function relationship of secondary coordination influences on metal-containing active sites. Chapter 3 discusses development of a previously undescribed dinucleating macrocyclic ligand, designed to support dicopper-oxygen cores relevant to the enzyme particulate methane monooxygenase (pMMO). Attempts to generate dicopper-hydroxo type cores resulted in hydrolytic products found to be dicopper complexes that were crystallographically characterized. Observed “paddle wheel” type configurations with cis-labile coordination sites in the dicopper complexes represent a class of compounds with diverse coordination chemistry. The final chapter (Chapter 4) describes the synthesis and characterization of a formal CuIII-alkylperoxo core utilizing spectroscopic and computational methods. The CuIII-alkylperoxo complex has been shown to undergo proton-coupled electron-transfer (PCET) reactions with weak O-H bond substrates. The CuIII-alkylperoxo core is considered to be a model system of a CuIII-OOH core, proposed to be a possible reactive intermediate in lytic polysaccharide monooxygenase (LPMO).
Subjects/Keywords: chemistry; copper
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APA (6th Edition):
Neisen, B. (2017). Modeling the Active Sites of Copper Monooxygenase Enzymes. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/206640
Chicago Manual of Style (16th Edition):
Neisen, Benjamin. “Modeling the Active Sites of Copper Monooxygenase Enzymes.” 2017. Doctoral Dissertation, University of Minnesota. Accessed December 14, 2019.
http://hdl.handle.net/11299/206640.
MLA Handbook (7th Edition):
Neisen, Benjamin. “Modeling the Active Sites of Copper Monooxygenase Enzymes.” 2017. Web. 14 Dec 2019.
Vancouver:
Neisen B. Modeling the Active Sites of Copper Monooxygenase Enzymes. [Internet] [Doctoral dissertation]. University of Minnesota; 2017. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11299/206640.
Council of Science Editors:
Neisen B. Modeling the Active Sites of Copper Monooxygenase Enzymes. [Doctoral Dissertation]. University of Minnesota; 2017. Available from: http://hdl.handle.net/11299/206640
Virginia Tech
11.
Li, Tao.
Architecture as Stage.
Degree: M. Arch., Architecture, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/51253
► Theaters used to an important civic space, and nowadays urban spaces have begun to be viewed as theatrical spaces. Theaters as well as cinemas are…
(more)
▼ Theaters used to an important civic space, and nowadays urban spaces have begun to be viewed as theatrical spaces. Theaters as well as cinemas are primarily shared spaces. As online viewing of films has become more prevalent, it is pertinent to explore how a shared experience can be enhanced. An outdoor theater where neighbors could gain access by foot, an atrium where preview viewing, discussion and gallery viewing could happen concurrently, are a few examples of what this multiplex offers.
The multiplex is located at Van Ness Metro Station facing Connecticut Ave in Washington D.C. The Multiplex comprises eleven movie theaters with seating capacity ranging from 35 to 150, an outdoor theater, a restaurant and several roof terraces.
Advisors/Committee Members: Holt, Jaan (committeechair), Feuerstein, Marcia F. (committee member), Ritter, James W. (committee member).
Subjects/Keywords: copper; concrete
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APA (6th Edition):
Li, T. (2015). Architecture as Stage. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51253
Chicago Manual of Style (16th Edition):
Li, Tao. “Architecture as Stage.” 2015. Masters Thesis, Virginia Tech. Accessed December 14, 2019.
http://hdl.handle.net/10919/51253.
MLA Handbook (7th Edition):
Li, Tao. “Architecture as Stage.” 2015. Web. 14 Dec 2019.
Vancouver:
Li T. Architecture as Stage. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10919/51253.
Council of Science Editors:
Li T. Architecture as Stage. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/51253
12.
Joshi, Kailas Prabhakar.
Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide.
Degree: Physics, 2013, Shri Jagdishprasad Jhabarmal Tibarewala University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/13923
► Today crystals have become the base of modern technology in all the respects with this aspects in the mind and ever increasing the demand of…
(more)
▼ Today crystals have become the base of modern
technology in all the respects with this aspects in the mind and
ever increasing the demand of single crystals in the variety of
field in science and technology, the work of the growth and the
study of some important crystals have been under taken in the
laboratory. The advances in the science of the solid state and
material science depends upon the availability of good quality
crystals. Today with modern technology, with sophisticated
instrument many national laboratories and university are growing
facilities in laboratories the work of the growth of iodated
varieties of crystals, which have the utility in day to day life,
still the growth of some crystals by using simple equipment by
utilizing fundamental properties of material much of the research
work have been carried out and it not less important by considering
all aspect and available facilities in laboratories the work of the
growth of iodate, iodide and sulphide respectively. The
determination of optical properties of grown crystal is a interest
of investigators. The advance in material science and solid state
science depends on crystal growth out of which each technique
having its own important. Today s developed technology in different
fields requires good quality crystal. In solid state device,
piezoelectric properties material science, quantum and non linear
optics, semiconductor device its instrumentation and several
branches of Engineering and technology needs better quality
crystals. As per the demand of good quality crystal, limited
researchers are involved and large variety of crystal are yet tried
to develop in research laboratory. In this method almost complete
suppression of large scale movement like convection is achieved
which otherwise affects to the crystals perfection. The growing
crystal are held in the gel in a strain free manner in test tubes
which are used.
References p. 190-205, List of publication p.
206
Advisors/Committee Members: Saraf, Kishor Bansilal.
Subjects/Keywords: Physics; Copper iodate crystal; Copper sulphide crystal
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Joshi, K. P. (2013). Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide. (Thesis). Shri Jagdishprasad Jhabarmal Tibarewala University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/13923
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Joshi, Kailas Prabhakar. “Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide.” 2013. Thesis, Shri Jagdishprasad Jhabarmal Tibarewala University. Accessed December 14, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/13923.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Joshi, Kailas Prabhakar. “Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide.” 2013. Web. 14 Dec 2019.
Vancouver:
Joshi KP. Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide. [Internet] [Thesis]. Shri Jagdishprasad Jhabarmal Tibarewala University; 2013. [cited 2019 Dec 14].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/13923.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Joshi KP. Extensive study of highly electrical conducting metal
copper by growing its crystal of iodate, iodide and
sulphide. [Thesis]. Shri Jagdishprasad Jhabarmal Tibarewala University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/13923
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
13.
Urošević, Daniela M., 1973-.
Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima.
Degree: Tehnički fakultet u Boru, 2017, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:15337/bdef:Content/get
► Tehnološko inženjerstvo - Hemija, hemijska tehnologija i hemijsko inženjerstvo / Technological engineering - Chemistry, chemical technology and chemical engineering
Po svakoj toni proizvedenog bakra u…
(more)
▼ Tehnološko inženjerstvo - Hemija, hemijska
tehnologija i hemijsko inženjerstvo / Technological engineering -
Chemistry, chemical technology and chemical
engineering
Po svakoj toni proizvedenog bakra u pirometalurškoj
proizvodnji nastaje 2,2-3,0 t šljake, što na svetskom nivou iznosi
oko 40 miliona tona šljake godišnje. Ova šljaka u sebi sadrži
0,5-2,1% Cu i tradicionalno se smatrala čvrstim otpadom i odlagala
na deponije. Sa padom prosečnog sadržaja bakra u rudi ispod 1%
šljaka je postala značajna sekundarna sirovina...
Advisors/Committee Members: Dimitrijević, Mile.
Subjects/Keywords: copper smelting slag; leaching; sulphating; roasting;
copper
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APA (6th Edition):
Urošević, Daniela M., 1. (2017). Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:15337/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Urošević, Daniela M., 1973-. “Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima.” 2017. Thesis, Univerzitet u Beogradu. Accessed December 14, 2019.
https://fedorabg.bg.ac.rs/fedora/get/o:15337/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Urošević, Daniela M., 1973-. “Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima.” 2017. Web. 14 Dec 2019.
Vancouver:
Urošević, Daniela M. 1. Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima. [Internet] [Thesis]. Univerzitet u Beogradu; 2017. [cited 2019 Dec 14].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:15337/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Urošević, Daniela M. 1. Ekstrakcija bakra iz topioničke šljake kombinovanim
postupcima. [Thesis]. Univerzitet u Beogradu; 2017. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:15337/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
14.
Bloomquist, Don J.
Statistical analysis and speciation modeling of copper in Oregon highway runoff.
Degree: MS, Chemical Engineering, 2009, Oregon State University
URL: http://hdl.handle.net/1957/13674
► Low levels of copper have been shown to impair the olfactory system of threatened and endangered (T&E) salmon, decreasing their predator avoidance behavior and likely…
(more)
▼ Low levels of
copper have been shown to impair the olfactory system of threatened and
endangered (T&E) salmon, decreasing their predator avoidance behavior and likely
increasing mortality. However, only dissolved
copper (dissCu) present as the cupric ion
(Cu2+) and weakly complexed species are truly bioavailable. Previous studies indicate the
vast majority of dissCu in natural waters is complexed with dissolved organic matter
(DOM). Highway stormwater runoff is a significant source of dissCu to receiving waters.
Assessing factors that may impact dissCu concentration and speciation in stormwater
provides a framework for predicting when and where
copper toxicity could be problematic.
To approach this problem, a stormwater sampling effort was undertaken to examine
impacts and correlations of site locale, traffic density, storm hydrology, the “first flush”
effect and water quality parameters on measured dissCu concentrations in highway runoff.
Analytically measured concentrations of key constituents in the stormwater were also
entered into a chemical equilibrium model to predict
copper speciation. The results of this
study show that runoff from urban/high traffic sites, as well as runoff due to the “first
flush” effect, exhibits the highest potential for
copper toxicity. Furthermore, correlations
of [dissCu] and Cu2+ with other variables are developed, the most meaningful of which
suggests that hardness is the water quality parameter most directly (positively) associated
with [Cu2+] due to competition with
copper for binding sites on DOM.
Advisors/Committee Members: Nason, Jeffrey A. (advisor).
Subjects/Keywords: copper speciation; Copper – Speciation – Oregon – Mathematical models
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APA (6th Edition):
Bloomquist, D. J. (2009). Statistical analysis and speciation modeling of copper in Oregon highway runoff. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13674
Chicago Manual of Style (16th Edition):
Bloomquist, Don J. “Statistical analysis and speciation modeling of copper in Oregon highway runoff.” 2009. Masters Thesis, Oregon State University. Accessed December 14, 2019.
http://hdl.handle.net/1957/13674.
MLA Handbook (7th Edition):
Bloomquist, Don J. “Statistical analysis and speciation modeling of copper in Oregon highway runoff.” 2009. Web. 14 Dec 2019.
Vancouver:
Bloomquist DJ. Statistical analysis and speciation modeling of copper in Oregon highway runoff. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1957/13674.
Council of Science Editors:
Bloomquist DJ. Statistical analysis and speciation modeling of copper in Oregon highway runoff. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/13674
Oregon State University
15.
Mosbrucker, Ariel M.
Copper Speciation in Wastewater-Impacted Surface Waters.
Degree: MS, Environmental Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/59814
► This study investigates the relationship between total and ionic copper in samples taken from the Tualatin River and wastewater treatment facilities (WWTFs) that discharge into…
(more)
▼ This study investigates the relationship between total and ionic
copper in samples taken from the Tualatin River and wastewater treatment facilities (WWTFs) that discharge into the Tualatin River.
Copper speciation was analyzed by determining conditional stability constants and densities of
copper binding ligands on the dissolved organic matter (DOM) in each sample using a two-ligand model. Differences in
copper binding between wastewater and river water were identified, changes in
copper binding following the mixing of WWTF effluent and receiving waters were observed, and the ability of the Biotic Ligand Model (BLM) to predict
copper speciation in each sample was determined. WWTF effluent samples were found to bind
copper more strongly than river water samples through a larger conditional stability constant for the strong binding site. At low dilution ratios,
copper binding characteristics in waters downstream of WWTF outfalls deviated from those of upstream waters by approaching the WWTF effluent characteristics for
copper binding. The BLM adequately predicted
copper speciation in waters without a high percentage of WWTF effluent, but overpredicted ionic
copper concentrations in effluent and downstream waters during low-flow by as much as 2-3 orders of magnitude. The differences observed highlight the need to account for WWTF DOM in the BLM framework.
Advisors/Committee Members: Nason, Jeffrey A. (advisor), Radniecki, Tyler S. (committee member).
Subjects/Keywords: copper; Copper – Environmental aspects – Oregon – Tualatin River
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APA ·
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Export
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APA (6th Edition):
Mosbrucker, A. M. (2016). Copper Speciation in Wastewater-Impacted Surface Waters. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59814
Chicago Manual of Style (16th Edition):
Mosbrucker, Ariel M. “Copper Speciation in Wastewater-Impacted Surface Waters.” 2016. Masters Thesis, Oregon State University. Accessed December 14, 2019.
http://hdl.handle.net/1957/59814.
MLA Handbook (7th Edition):
Mosbrucker, Ariel M. “Copper Speciation in Wastewater-Impacted Surface Waters.” 2016. Web. 14 Dec 2019.
Vancouver:
Mosbrucker AM. Copper Speciation in Wastewater-Impacted Surface Waters. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1957/59814.
Council of Science Editors:
Mosbrucker AM. Copper Speciation in Wastewater-Impacted Surface Waters. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59814
University of Saskatchewan
16.
Kuzma, Darina.
Spectroscopic Studies of Copper-Thiomolybdate Interactions.
Degree: 2009, University of Saskatchewan
URL: http://hdl.handle.net/10388/etd-08062009-153213
► Cu is an important trace element in living systems, including animals. It is a part of many enzymes responsible for different processes occurring in the…
(more)
▼ Cu is an important trace element in living systems, including animals. It is a part of many enzymes responsible for different processes occurring in the body. However, antagonists can severely decrease the amount of Cu available to the animal, which results in numerous health issues caused by Cu deficiency. The main antagonists of the Cu are thiomolybdates whose effect is especially harsh in ruminants due to their high potential to synthesize these compounds. Thiomolybdates (the ions MoOxS4-x2- ,where x = 0-3) are formed in the rumen from molybdate and sulfide (from degradation of sulfate), both of which come from the food and water ingested by the animal.
The first part of the project described in this thesis was to develop reproducible preparative methods of CuTM samples in solution and solids, under conditions as biologically relevant as possible. This crucial information is missing in the literature related to Cu deficiency. The second part studied the structure of the adduct formed between Cu and two of the thiomolybdates: tetrathiomolybdate, TM4 and trithiomolybdate, TM3, as these are the most important in Cu deficiency.
In solution, the appropriate solution medium and the concentration of reactants were chosen to study the stoichiometry of Cu:TM in solution before precipitation occurs.
Conditions for preparation of solid CuTM adducts were chosen to obtain the amount of solid necessary for further studies and to eliminate the formation of unwanted side-products. In the solid phase, the stoichiometry of Cu:TM was investigated by elemental analysis.
EPR spectroscopy of solid CuTM samples revealed the presence of diamagnetic species which were partially identified.
EXAFS studies were performed on both the Mo and Cu K edges. Spectra defined the oxidation states of both main metal atoms, Cu and Mo. Fitting of the measured EXAFS spectra of solid CuTM samples prepared at three different Cu:TM ratios determined the interatomic distances involved in these compounds. This data was used to determine the structure of the CuTM units which polymerize to form the final product. IR spectroscopy was also used to confirm the presence of some of the groups in these adducts.
All the results from the various spectroscopic techniques were then combined to proposed a complete reaction scheme for the two-step formation of the CuTM4 and CuTM3 adduct species.
Advisors/Committee Members: Reid, Steve.
Subjects/Keywords: EXAFS; Copper-deficiency; EPR; Copper; Thiomolybdates; Spectroscopy
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APA ·
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Export
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APA (6th Edition):
Kuzma, D. (2009). Spectroscopic Studies of Copper-Thiomolybdate Interactions. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-08062009-153213
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kuzma, Darina. “Spectroscopic Studies of Copper-Thiomolybdate Interactions.” 2009. Thesis, University of Saskatchewan. Accessed December 14, 2019.
http://hdl.handle.net/10388/etd-08062009-153213.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kuzma, Darina. “Spectroscopic Studies of Copper-Thiomolybdate Interactions.” 2009. Web. 14 Dec 2019.
Vancouver:
Kuzma D. Spectroscopic Studies of Copper-Thiomolybdate Interactions. [Internet] [Thesis]. University of Saskatchewan; 2009. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10388/etd-08062009-153213.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kuzma D. Spectroscopic Studies of Copper-Thiomolybdate Interactions. [Thesis]. University of Saskatchewan; 2009. Available from: http://hdl.handle.net/10388/etd-08062009-153213
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Massey University
17.
Norris, Gillian E.
A comparison of copper(I) and copper(II) bound to thioether ligands.
Degree: MS, Chemistry, 1975, Massey University
URL: http://hdl.handle.net/10179/12058
► The structures of Cu(II) (DTH)2(BF4)2 (where DTH = 2,5-dithiahexane) and Cu(I) (DTO)2BF4 (where DTO = 3,6-dithiaoctane) have been investigated by single crystal X-ray diffraction techniques.…
(more)
▼ The structures of Cu(II) (DTH)2(BF4)2 (where DTH = 2,5-dithiahexane) and Cu(I) (DTO)2BF4
(where DTO = 3,6-dithiaoctane) have been investigated by single crystal X-ray diffraction techniques. After full matrix least squares refinement of the structures, with anisotropic temperature factors for all non hydrogen atoms in the Cu(II) structure, and for all atoms larger than fluorine in the Cu(I) structure, the conventional R factor converged to a final value of 0.057 for the Cu(II) structure, and 0.082 for the Cu(I) complex. The dark red crystals of the Cu(II) complex belong to the centrosymmetric monoclinic space group P2 1/c. with a = 8.082(3)Å, b = 10.282(3)Å, c = 11.893(4)Å and β = 115.3 degrees. Two
dithiahexane ligands and two BF4-ions were found to co-ordinate to the Cu(II) ion to form a tetragonally
distorted octahedron, with four Cu(II)-S bonds averaging 2.317Å in length, and two longer Cu(II)-F bonds averaging 2.576Å. The four sulphur atoms are part of two five membered Cu(II)-S-C-C-S rings in which both carbons are on the same side of the plane containing the copper and sulphur atoms. The colourless crystals of the Cu(I) complex were obtained in the non-centric orthorhombic space group Pna2 1, with a
= 14.581(2)Å, b = 13.421(2)Å and c = 10.781(2)Å. The molecules exist as discrete monomeric species, with no co-ordination of the BF4- ion to the metal ion. The two ligand molecules co-ordinate to the Cu(I)
ion to form a distorted tetrahedron, with the S-Cu(I)-S angles varying between 94.0 and 121.1 degrees. The four Cu(I)-S bonds average 2.307Å in length, and hence are approximately equal to the Cu(II)-S bonds (within experimental error). The two five membered Cu(I)-S-C-C-S rings are both in a gauche conformation, with one carbon below the plane containing the Cu(I) and S atoms, and the other above. The BF4- ion was disordered and was refined using rigid group restrictions. Cu-S co-ordination is thought
to occur in some copper containing oxidation-reduction proteins. The observation of similar Cu-S bond distances when Cu(I) and Cu(II) are co-ordinated to thioether ligands (resembling the side chain of the amino acid methionine) may therefore be of direct relevance to the copper co-ordination in such proteins.
Subjects/Keywords: Copper proteins;
Copper
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APA (6th Edition):
Norris, G. E. (1975). A comparison of copper(I) and copper(II) bound to thioether ligands. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/12058
Chicago Manual of Style (16th Edition):
Norris, Gillian E. “A comparison of copper(I) and copper(II) bound to thioether ligands.” 1975. Masters Thesis, Massey University. Accessed December 14, 2019.
http://hdl.handle.net/10179/12058.
MLA Handbook (7th Edition):
Norris, Gillian E. “A comparison of copper(I) and copper(II) bound to thioether ligands.” 1975. Web. 14 Dec 2019.
Vancouver:
Norris GE. A comparison of copper(I) and copper(II) bound to thioether ligands. [Internet] [Masters thesis]. Massey University; 1975. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10179/12058.
Council of Science Editors:
Norris GE. A comparison of copper(I) and copper(II) bound to thioether ligands. [Masters Thesis]. Massey University; 1975. Available from: http://hdl.handle.net/10179/12058
University of British Columbia
18.
Garner, Andrew.
Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
.
Degree: 1974, University of British Columbia
URL: http://hdl.handle.net/2429/19629
► In order to test the apparently conflicting predictions of some current theories of strain hardening, slip line length measurements were made on a series of…
(more)
▼ In order to test the apparently conflicting predictions of some current theories of strain hardening, slip line length measurements were made on a series of oriented copper single crystals, identically prestrained at 673°K, polished and incrementally strained at temperatures between 573°K and 4.2°K; slip lines formed during low temperature increments were found to be longer than those formed during strain increments at higher temperature (Garner and Alden, 1974).
The result is shown to be in conflict with any theory of strain hardening in which slip lines are blocked by specific obstacle configurations, such as Lomer-Cottrell barriers, ribbons of converted pile-ups or dislocation cell walls. In contrast, the result is shown to be consistent with theories of strain hardening in which slip lines are blocked by statistical interaction between expanding glide loops and forest dislocations, on the condition that, within the framework of such a theory, the glide loops are able to expand athermally over a newly available free area of slip plane, after a thermally activated process. Two possible thermally activated processes are discussed. A unified view of slip lines properties is presented which is shown to provide a self-consistent explanation of the temperature variation of slip line length, slip band formation, the existence of multipole carpets and the variation of flow stress with temperature.
The statistical aspects of this interpretation were investigated further by obtaining 77°K microstrain curves from a series of oriented copper single crystals, prestrained at temperatures between 1000°K and 77°K, to produce dislocation microstructures with differing degrees of regularity, yet with approximately the same overall density. The forest dislocation microstructures of an identically prepared series of crystals were examined using a dislocation etch on the primary slip plane. A statistical sampling technique was devised, which was used to measure local dislocation densities. In addition, new parameter is introduced, namely the ratio of the sampled standard deviation, to mean local dislocation density, which quantifies the degree of regularity of a dislocation micro-structure. All microstructures were found to have a smaller degree of regularity than a random distribution.
For crystals prestrained at temperatures above 293°K, at any given fraction of the 77°K yield stress, the amount of microstrain was found to increase as the microstructures became less regular. Crystals prestrained at and below 293°K exhibited the Haasen-Kelly effect, which was attributed to restricted source operation. However, once sources begin to operate, the amount of microstrain anticipated from the degree of regularity was indeed detected.
Subjects/Keywords: Copper;
Copper crystals
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APA (6th Edition):
Garner, A. (1974). Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
. (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/19629
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Garner, Andrew. “Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
.” 1974. Thesis, University of British Columbia. Accessed December 14, 2019.
http://hdl.handle.net/2429/19629.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Garner, Andrew. “Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
.” 1974. Web. 14 Dec 2019.
Vancouver:
Garner A. Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
. [Internet] [Thesis]. University of British Columbia; 1974. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2429/19629.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Garner A. Measurement and statistical interpretation of slip line length and microstrain in copper single crystals
. [Thesis]. University of British Columbia; 1974. Available from: http://hdl.handle.net/2429/19629
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
19.
Halverson, Joshua.
Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide.
Degree: PhD, Chemistry, 2017, University of Minnesota
URL: http://hdl.handle.net/11299/188969
► Semiconductors are a broad class of materials and by extension present a large array of possibilities for potential research. This thesis looks at two different…
(more)
▼ Semiconductors are a broad class of materials and by extension present a large array of possibilities for potential research. This thesis looks at two different areas of semiconductor research. The first is electronic doping of semiconductor nanocrystals and the second is the deposition of copper aluminum oxide via atomic layer deposition (ALD). Semiconductor nanocrystals are semiconductor particles with diameters less than 10 nm. At these size ranges, semiconductor nanocrystals display several unique electrical and optical characteristic due to quantum confinement. Quantum confinement is a phenomenon that arises when the physical size of the nanocrystal is smaller than the wavefunction size of the electrons and holes that allow electrical conductivity in semiconductors. These quantum confinement effects are tunable based on the size of the nanocrystal, which allows one material to have a broad range of possible uses. Even greater control could be had if semiconductor nanocrystals could be doped with heterovalent dopants, as is seen in traditional semiconductors. This thesis look at incorporating group 13 dopants into cadmium selenide nanocrystals and found that while the dopants had effects on the electronic structure of the nanocrystals they were not successfully incorporated into the nanocrystals. The dopants instead were bound to the surface of the nanocrystal. Copper aluminum oxide has generated interest as a potential p-type transparent conductive oxide. Thin films of this material have been deposited via physical vapor methods. Depositing this material via ALD provides a great level of film thickness control, which is critical in many thin film devices. Deposition of copper containing films via ALD has been hampered by a lack of suitable copper precursor. As a solution to that problem, this thesis demonstrates the construction of an ALD deposition system that can use both solid and liquid ALD precursors. This system with its extended capabilities was then used to deposit thin films of copper aluminum oxide using solid copper precursors.
Subjects/Keywords: ALD; Copper Aluminum Oxide; Copper Oxide
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APA (6th Edition):
Halverson, J. (2017). Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/188969
Chicago Manual of Style (16th Edition):
Halverson, Joshua. “Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide.” 2017. Doctoral Dissertation, University of Minnesota. Accessed December 14, 2019.
http://hdl.handle.net/11299/188969.
MLA Handbook (7th Edition):
Halverson, Joshua. “Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide.” 2017. Web. 14 Dec 2019.
Vancouver:
Halverson J. Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide. [Internet] [Doctoral dissertation]. University of Minnesota; 2017. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11299/188969.
Council of Science Editors:
Halverson J. Group 13 Metal Doping of Cadmium Selenide Nanocrystals and Atomic Layer Deposition of Copper Oxide and Copper Aluminum Oxide. [Doctoral Dissertation]. University of Minnesota; 2017. Available from: http://hdl.handle.net/11299/188969
Northeastern University
20.
Li, Yangfan.
Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition.
Degree: PhD, Department of Mechanical and Industrial Engineering, 2017, Northeastern University
URL: http://hdl.handle.net/2047/D20249270
► In the cold spray (CS) process, solid powder particles accelerated to several hundred meters a second impact the substrate and deform into splats that are…
(more)
▼ In the cold spray (CS) process, solid powder particles accelerated to several hundred meters a second impact the substrate and deform into splats that are stacked up to form dense coatings on the substrate. However, these deposited splats are not fully bonded to each other, making deposited materials less ductile than wrought materials. In this dissertation, a series of characterization studies of CS deposits of Cu and Cu-alloys are presented, addressing both single-traverse and multi-traverse deposition. Single-traverse deposits were created to investigate the thickness profile and deposition efficiency distributions in single-traverse deposition. Multi-traverse two-spray layer coatings were deposited to investigate the effects of spray parameters, powder characteristics, and post-spray heat treatment on the densification and bonding in the deposited material.; An ultrasonic washing test, developed in this study to determine the locations and extent of poor-bonded splats in coatings deposited multi-traverse CS, revealed that poor-bonded splats were concentrated along the boundaries between successive spray traverses and spray layers. Multi-traverse, two spay-layer Cu coatings sprayed on Al substrates in nitrogen gas at 200 800 °C (473 1073 K) all had virtually full density but their splats were not fully bonded, particularly along spray and spray-layer boundaries. The occurrence of poor-bonded splats decreased with increasing spray gas temperature. Post-spray heat treatment did not improve splat bonding suggesting that oxidation may have had counter effects at the splat boundaries. Use of small powder particles with irregular shape was found to promote splat bonding.; Cu-36Zn-1Mn and Cu-9Al-4Fe coatings sprayed at 400 °C (673 K) and 600 °C (873 K) all had nearly full density but exhibited poorly bonded splats along spray and spray-layer boundaries. Tensile test showed virtually no ductility, also indicating partial splat bonding in these coatings. Pre-annealing of Cu-36Zn-1Mn powder changed the initial β-brass microstructure to a two-phase α+β microstructure, which improved densification through powder softening effects but also degraded bonding due possibly to oxidation. Pre-annealing Cu-9Al-4Fe powder dissolved the intermetalllics in the matrix or transformed them to more stable forms, which improved both densification and bonding.; Models were developed based on a Gaussian mass flow rate distribution in CS to simulate the deposit thickness, the deposition efficiency, the location of poor bonding and the thickness of poor-bonded layers in multi-traverse CS coatings. The poor-bonded layers along spray and spray-layer boundaries and at the interface with the substrate may amount to as much as 24% of the total coating volume, posing an important concern in the fabrication of thick coating by cold spray deposition.
Subjects/Keywords: characterization; cold spray; copper; copper alloys; simulation
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MLA ·
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Export
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Manager
APA (6th Edition):
Li, Y. (2017). Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20249270
Chicago Manual of Style (16th Edition):
Li, Yangfan. “Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition.” 2017. Doctoral Dissertation, Northeastern University. Accessed December 14, 2019.
http://hdl.handle.net/2047/D20249270.
MLA Handbook (7th Edition):
Li, Yangfan. “Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition.” 2017. Web. 14 Dec 2019.
Vancouver:
Li Y. Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition. [Internet] [Doctoral dissertation]. Northeastern University; 2017. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2047/D20249270.
Council of Science Editors:
Li Y. Characterization of cold sprayed copper and copper alloys and simulation of coating profile, deposition yield and defect formation in cold spray deposition. [Doctoral Dissertation]. Northeastern University; 2017. Available from: http://hdl.handle.net/2047/D20249270
University of KwaZulu-Natal
21.
Choveaux, David L.
Recombinant expression and initial characterisation of two Plasmodium copper binding proteins.
Degree: PhD, Biochemistry, 2013, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/10176
► Plasmodium falciparum is a protozoan parasite responsible for the most severe form of human malaria, with infection often resulting in death. Efforts to control malaria…
(more)
▼ Plasmodium falciparum is a protozoan parasite responsible for the most severe form of human malaria, with infection often resulting in death. Efforts to control malaria have been hindered by an increased spread of parasite resistance to previously effective antimalarial drugs, leading to an intensified search for novel antimalarial drug targets. A group of proteins suggested as potentially effective targets are the integral membrane transport proteins, since they play key roles in Plasmodium parasite growth and replication. One such membrane protein recently characterised was the P. falciparum
copper efflux transporter. Treatment of cultured P.
falciparum parasites with the intracellular
copper chelator neocuproine inhibited parasite growth, suggesting that additional mechanisms for malaria parasite
copper homoeostasis are likely to be present.
Copper is an essential trace element involved in enzymatic processes requiring redox-chemistry. In higher eukaryotes
copper is transported across the plasma
membrane via the
copper transport protein, Ctr1, and distributed intracellularly by
copper metallochaperones. The mechanisms for
copper acquisition and distribution in the Plasmodium parasite are, however, yet to be characterised. An in silico Basic Local Alignment Search Tool for protein (BLASTp) screen of the Plasmodium database (www.plasmodb.org) identified sequences corresponding to a putative
copper transporter, and associated
copper metallochaperones, in eight species of the Plasmodium
parasite. Each of the Plasmodium
copper transport protein sequences was found to contain features common to the well characterised
copper transporters. These features included predicted
copper-binding motifs in the protein's amino terminus, three membrane spanning domains and the characteristic MxxxM and GxxxG motifs located in the second and third
transmembrane domains, respectively. Affinity purified anti-peptide antibodies, generated against an immunogenic peptide (CSDKQSGDDECKPILD) in the amino terminus of a putative malaria parasite
copper transporter (PY00413), detected the target protein in murine malaria
parasites in association with a parasite membrane. The open reading frames corresponding to the amino terminal domains of one P. berghei [PBANKA_130290 (447 bp)] and two P. falciparum [PF14_0211 (132 bp) and PF14_0369 (282 bp)] putative
copper transport proteins were PCR
amplified, ligated into pGEM®-T and then expressed as recombinant fusion proteins with maltose binding protein (MBP). The resulting sizes for the recombinant proteins were 61kDa for MBP-PbCtrNt, 48kDa for MBP-PfCtr211Ntᵀᴰ and 55kDa for MBP-PfCtr369Ntᵀᴰ, with each protein being recognised by a corresponding anti-peptide antibody. All three recombinant
proteins bound
copper in vitro and in vivo, with each having a binding preference for the reduced cuprous ion. This preference has been similarly established for the characterised
copper transporters. Although the results supported the expression and
copper binding ability of a Plasmodium parasite
copper transport…
Advisors/Committee Members: Goldring, J. P. Dean (advisor).
Subjects/Keywords: Biochemistry.; Copper proteins.
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APA ·
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APA (6th Edition):
Choveaux, D. L. (2013). Recombinant expression and initial characterisation of two Plasmodium copper binding proteins. (Doctoral Dissertation). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/10176
Chicago Manual of Style (16th Edition):
Choveaux, David L. “Recombinant expression and initial characterisation of two Plasmodium copper binding proteins.” 2013. Doctoral Dissertation, University of KwaZulu-Natal. Accessed December 14, 2019.
http://hdl.handle.net/10413/10176.
MLA Handbook (7th Edition):
Choveaux, David L. “Recombinant expression and initial characterisation of two Plasmodium copper binding proteins.” 2013. Web. 14 Dec 2019.
Vancouver:
Choveaux DL. Recombinant expression and initial characterisation of two Plasmodium copper binding proteins. [Internet] [Doctoral dissertation]. University of KwaZulu-Natal; 2013. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10413/10176.
Council of Science Editors:
Choveaux DL. Recombinant expression and initial characterisation of two Plasmodium copper binding proteins. [Doctoral Dissertation]. University of KwaZulu-Natal; 2013. Available from: http://hdl.handle.net/10413/10176
Oregon State University
22.
Osorio, Jaime I.
Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile.
Degree: MS, 2017, Oregon State University
URL: http://hdl.handle.net/1957/61911
► This dissertation is divided into two major chapters. The first chapter covers the geology of the Encuentro deposit with emphasis in the intrusion sequence, vein…
(more)
▼ This dissertation is divided into two major chapters. The first chapter covers the geology
of the Encuentro deposit with emphasis in the intrusion sequence, vein mineral assemblages and distribution, and age of mineralization. The data used for this section includes field mapping, petrography, elemental analysis of biotite, and isotopic geochronology. The second chapter focuses on the pressure-temperature evolution of the magmatic-hydrothermal system at Encuentro and reconstruction of the evolution path for the mineralizing fluids. The basis of this chapter is the application of different geothermometers in both porphyry dikes and different veins present in the deposit.
The Encuentro porphyry Cu-Au-Mo deposit is part of the middle Eocene to early Oligocene porphyry
copper belt of northern Chile. New core logging observations, together with geologically constrained U-Pb and Re-Os geochronology documents the intrusion sequence and the timing of Cu-Au and Cu-Mo mineralization. A sequence of five porphyry dikes (Eep-1 to Eep-5) of dacitic composition is synchronous with and genetically related to mineralization. The Encuentro porphyry Cu-bearing dikes span from 42.3 ± 0.7 Ma to 41.2 ± 0.6 Ma, based on U-Pb zircon ages via LA-ICP-MS. The earliest intrusion (Eep-1) contains the highest Cu and Au grades; the metal content decreases systematically from oldest to youngest porphyry intrusions. Each porphyry intrusion developed a similar sequence of veins: (1) biotite, (2) early dark micaceous halos (EDM), and (3) a series of A-type quartz-K-feldspar-anhydrite veins (A1 to A5). In each sequence, biotite veins and EDM halos are cut by A-quartz veins. Cu-bearing sulfides are present in all these veins; however, A-type quartz veins contribute most of the Cu-Au and are the most voluminous vein type in the deposit (up to 56 vol.%, averaging 5 vol.% in rocks with >0.3 wt.% Cu). A-type veins are most abundant within and surrounding the upper parts of the porphyry dikes, and displays a concentric distribution in which the volume % of A-type veins is well-correlated with the Cu and Au ore grade.
Other veins that are also stable with K-silicate alteration, include the vein sequence (4) B- type quartz-chalcopyrite±molybdenite, (5) quartz-anhydrite-molybdenite ± Cu-sulfides (QAM), and (6) magnetite±chalcopyrite veins. These veins postdate all porphyry intrusions, and offset all earlier biotite veins, EDM halos, and A-quartz veins. QAM veins and to a lesser extent B-type veins contribute the bulk of molybdenum mineralization in the deposit. Four Re-Os ages of molybdenite in different veins types range from 41.3 ± 0.2 Ma to 40.9 ± 0.2 Ma. These dates are consistent with crosscutting vein relationships and also with the 41.2 Ma age of the youngest porphyry (Eep-5) that B-type veins and QAM veins cut. Hence, most of the Mo mineralization likely occurred as a protracted single event immediately following the emplacement of porphyry phase Eep-5.
Late veins include the sequence (7) chalcopyrite-pyrite±sericite veins, (8) chlorite-…
Advisors/Committee Members: Dilles, John H (advisor), Tepley, Frank (committee member).
Subjects/Keywords: Porphyry copper deposit
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APA (6th Edition):
Osorio, J. I. (2017). Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61911
Chicago Manual of Style (16th Edition):
Osorio, Jaime I. “Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile.” 2017. Masters Thesis, Oregon State University. Accessed December 14, 2019.
http://hdl.handle.net/1957/61911.
MLA Handbook (7th Edition):
Osorio, Jaime I. “Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile.” 2017. Web. 14 Dec 2019.
Vancouver:
Osorio JI. Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1957/61911.
Council of Science Editors:
Osorio JI. Intrusion Sequence and Hydrothermal Fluid Evolution of Encuentro Porphyry Cu-Mo-Au deposit, Northern Chile. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61911
NSYSU
23.
Hu, Shih-chieh.
Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.
Degree: Master, Chemistry, 2008, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048
► The active center of copper proteins can divide into Type I, Type II and Type III categories according to their copper coordinated environment. The synthesis…
(more)
▼ The active center of
copper proteins can divide into Type I, Type II and Type III categories according to their
copper coordinated environment. The synthesis and characterization of thiol ligands, NSC2SN(1c): N1,N2-bis(2-mercaptoethyl)-N1,N2-bis-(2-pyridinylmethyl)- 1,2-ethanediamine and NSC4SN(1d): N1,N4-bis(2-mercaptoethyl)-N1,N4- bis(2-pyridinylmethyl)-1,4-butane-diamine to mimic that active center of
copper proteins are described. Those new types of ligands (1c and 1d) react with [Cu(CH3CN)4]ClO4 afford the mononuclear
copper complexes. On the other hand, the synthesis of the known tripodal ligand TNPA(4b): 2,2â2,â-nitrilotris(N-(pyridine-2-yl)acetamide) and new tripodal ligand TNPMA(4c): 2,2â2â-nitrilotris(N-(pyridin-2-ylmethyl)acetamide) are also characterized. The reactivity of [Cu(CH3CN)4]BF4 of two tripodal ligands are described.
Advisors/Committee Members: Michael Y. Chiang (committee member), Sodio C. N. Hsu (chair), Yeh, W.-Y. (chair), Y. -M. Wang (chair).
Subjects/Keywords: nitrogen; copper; sulfur
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APA (6th Edition):
Hu, S. (2008). Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hu, Shih-chieh. “Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.” 2008. Thesis, NSYSU. Accessed December 14, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hu, Shih-chieh. “Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.” 2008. Web. 14 Dec 2019.
Vancouver:
Hu S. Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. [Internet] [Thesis]. NSYSU; 2008. [cited 2019 Dec 14].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hu S. Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Tasmania
24.
Bath, AB.
Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada.
Degree: 2010, University of Tasmania
URL: https://eprints.utas.edu.au/19304/1/whole_BathAdamBrian2010_thesis.pdf
► The present study assesses ore-forming processes and the timing of mineralisation in the Lower Main Zone of the Lorraine porphyry Cu deposit, north-central British Columbia.…
(more)
▼ The present study assesses ore-forming processes and the timing of mineralisation in the
Lower Main Zone of the Lorraine porphyry Cu deposit, north-central British Columbia.
The deposit is hosted in an intrusion complex that comprises pre-mineral and post-mineral
shoshonitic ultrabasic to syenite rock types. New U-Pb zircon ages of pre- and post-mineralisation
dykes constrain the timing of mineralisation between 178.8 and 178.4 Ma. Intrusions
in the Lower Main Zone have undergone several stages of alteration, which
include early-, transitional- and late-stage assemblages. Early stage alteration includes;
(1) pervasive biotite and K-feldspar alteration of wall rocks; (2) veins and patches of magnetite-diopside
± albite and (3) early coarse-grained K-feldspar-biotite veins that are locally
associated with bornite and chalcopyrite. Transitional-stage mineralisation has produced
distinctive sulphide zonation patterns consisting of a bornite-chalcocite core grading outwards
to domains of bornite-chalcopyrite, chalcopyrite, chalcopyrite>pyrite, and a peripheral
domain of pyrite with minor chalcopyrite. The sulphide zonation pattern is tilted and
has overprinted numerous rock-types and the early-formed alteration assemblages. Syenite
in the inner bomite-chalcopyrite zone typically contains abundant turbid K-feldspar (i.e.
>70 %), whereas syenite marginal to the bomite-chalcopyrite core contains 50-70 % Kfeldspar,
indicating an increase in K-metasomatism of syenites towards the core of the deposit.
Transitional-stage mineralisation at Lorraine predominantly occurs as fine-grained disseminated
sulphides in syenite, biotite pyroxenite and fine-grained K-feldspar biotite rock.
Rare net-textured chalcopyrite and bomite mineralisation has also been identified in some
biotite pyroxenites. Earlier workers speculated that biotite pyroxenites with net-textured
sulphides at Lorraine may represent a 'deep' magmatic component of the porphyry system.
However textural analysis of mineralised biotite pyroxenite appears to be at odds with this
concept. In particular the current study has shown that: (1) primary diopside, which form
contacts with sulphides, have corroded and actinolite-altered margins, suggesting alteration
of primary minerals; (2) primary diopside and biotite do not contain primary sulphide inclusions and therefore there appears to be no evidence of a primary magmatic sulphide
melt; (3) irregular-shaped relicts of biotite and diopside occur in sulphides, suggesting
sulphides have replaced primary minerals and (4) deposit-scale sulphide zonation patterns
overprints numerous lithology types, including biotite pyroxenites with net-textured sulphides.
These findings support the author's contention that primary magmatic biotite and
diopside were replaced or partially replaced by sulphide minerals, and are consistent with
an influx of Cu and S during transitional-stage alteration and subsequent replacement of
primary magmatic minerals (e.g., biotite) as opposed to the precipitation of primary…
Subjects/Keywords: Copper ores; Geochemistry
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APA (6th Edition):
Bath, A. (2010). Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/19304/1/whole_BathAdamBrian2010_thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bath, AB. “Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada.” 2010. Thesis, University of Tasmania. Accessed December 14, 2019.
https://eprints.utas.edu.au/19304/1/whole_BathAdamBrian2010_thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bath, AB. “Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada.” 2010. Web. 14 Dec 2019.
Vancouver:
Bath A. Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada. [Internet] [Thesis]. University of Tasmania; 2010. [cited 2019 Dec 14].
Available from: https://eprints.utas.edu.au/19304/1/whole_BathAdamBrian2010_thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bath A. Geology, geochronology and alteration of the Lorraine alkalic porphyry Cu-Au deposit, British Columbia, Canada. [Thesis]. University of Tasmania; 2010. Available from: https://eprints.utas.edu.au/19304/1/whole_BathAdamBrian2010_thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Zambia
25.
Mhandu, Takunda Joseph.
A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
.
Degree: 2017, University of Zambia
URL: http://dspace.unza.zm:8080/xmlui/handle/123456789/4685
► Studies done on Mimbula ore have been on agitation leaching, high temperature and pressure leaching and treatment of refractory ore (TORCO) process. However these methods…
(more)
▼ Studies done on Mimbula ore have been on agitation leaching, high temperature and pressure leaching and treatment of refractory ore (TORCO) process. However these methods attracted significantly high capital investment leaving heap leaching as a more economically attractive method to be investigated.
This research was aimed at assessing the amenability of Mimbula refractory ore to heap leaching and to understand the conditions under which copper dissolution can be enhanced. The specific objectives were to determine the optimum conditions for agglomeration, the optimum bed height that gave the best leaching efficiency and to establish the relationship between bed height and leaching efficiency.
Ore characterisation was done to establish the chemical and mineralogical compostion of the ore. Agglomeration and column leaching experiments were carried out in agglomeration drum and PVC pipes respectively. In order to validate the experiments, each experiment was repeated three times. The soak test, agglomerate size distribution and visual inspection were used as the tools for evaluating the agglomerates quality. For all the column leaching experiments, a chemical and mineralogical composition analyses of feed (ore) and leach residues was carried out in order to measure the extent of copper dissolution.
The optimized agglomeration parameters were 600 gpt binder dosage, 14 % moisture content of ore, 20 rpm agglomeration speed and 3 min residence time. Agglomeration greatly improved the leach efficiency and kinetics. The highest leach efficiency of 60 % was obtained with agglomerated ore in 12 days compared to 32 % for unagglomerated ore in 94 days. The mineralogical analysis showed that about 90 % of the cupriferous mica dissolved into solution whilst chrysocolla and pseudomalachite completely dissolved in solution. However, sulphides, especially chalcopyrite were difficult to leach under the conditions employed. It was concluded that Mimbula refractory copper ore is amenable to heap leaching. Further studies to improve dissolution of sulphide minerals using acidified ferric sulphate and/or bioleaching were recommended.
Subjects/Keywords: Copper – Metallurgy;
Leaching
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APA (6th Edition):
Mhandu, T. J. (2017). A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
. (Thesis). University of Zambia. Retrieved from http://dspace.unza.zm:8080/xmlui/handle/123456789/4685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mhandu, Takunda Joseph. “A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
.” 2017. Thesis, University of Zambia. Accessed December 14, 2019.
http://dspace.unza.zm:8080/xmlui/handle/123456789/4685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mhandu, Takunda Joseph. “A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
.” 2017. Web. 14 Dec 2019.
Vancouver:
Mhandu TJ. A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
. [Internet] [Thesis]. University of Zambia; 2017. [cited 2019 Dec 14].
Available from: http://dspace.unza.zm:8080/xmlui/handle/123456789/4685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mhandu TJ. A help leach feasibility study for mimbula refractory copper ore of Nchanga mine
. [Thesis]. University of Zambia; 2017. Available from: http://dspace.unza.zm:8080/xmlui/handle/123456789/4685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
26.
Merz, Gregory.
Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
.
Degree: 2016, Cornell University
URL: http://hdl.handle.net/1813/43612
► Proteins play an important and diverse role in all living organisms. If proteins are unable to carry out their prescribed functions, the results can be…
(more)
▼ Proteins play an important and diverse role in all living organisms. If proteins are unable to carry out their prescribed functions, the results can be problematic, or even fatal, for an organism. For example, in humans, Alzheimer's and Parkinson's are just 2 of the many diseases caused by proteins which either do not function, or function incorrectly. Proteins can also perform chemical transformations which are very difficult via synthetic methods, such as the oxidation of methane to methanol and the fixation of dinitrogen to ammonia. Understanding the mechanisms of these processes may lead to much more efficient catalysts, greatly reducing the large energy expenditures currently required. In biochemistry, the link between structure and function has been well established, and so in order to understand the mechanisms and functions of proteins, we must understand their structures. In many cases, the structures of flexible proteins can be difficult to elucidate, especially if multiple conformations exist simultaneously. Here, we use
copper-based pulsed dipolar ESR spectroscopy (PDS) and other, complimentary biophysical and biochemical methods to characterize protein conformations in flexible proteins. These include mutants of Superoxide Dismutase 1 (SOD1) which cause familial ALS, and the Drosophila melanogaster circadian clock protein Period. By using these techniques, we show that fALS mutants of SOD1 tend to aggregate in solution as opposed to the wild-type (WT) protein which does not. Furthermore, we propose a structural mechanism by which this aggregation occurs. In the Period protein, we have discerned small differences in the conformation of mutants that mimic phosphorylation vs. the WT. These subtle changes may cause differences in circadian behavior observed in fruit flies.
Advisors/Committee Members: Chen,Peng (committeeMember), Freed,Jack H (committeeMember).
Subjects/Keywords: Copper;
ESR;
Protein
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APA (6th Edition):
Merz, G. (2016). Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
. (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/43612
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Merz, Gregory. “Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
.” 2016. Thesis, Cornell University. Accessed December 14, 2019.
http://hdl.handle.net/1813/43612.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Merz, Gregory. “Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
.” 2016. Web. 14 Dec 2019.
Vancouver:
Merz G. Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
. [Internet] [Thesis]. Cornell University; 2016. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1813/43612.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Merz G. Characterizing Protein Conformations Using Copper-Based Pulsed Dipolar Esr Spectroscopy And Complimentary Biophysical Methods
. [Thesis]. Cornell University; 2016. Available from: http://hdl.handle.net/1813/43612
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Uppsala University
27.
Hjeltström, Anna.
Copper minerals under the microscope.
Degree: Earth Sciences, 2015, Uppsala University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049
► From many perspectives copper is a very important metal for the modern society. It can be found in everything from jewellery to electronics. For…
(more)
▼ From many perspectives copper is a very important metal for the modern society. It can be found in everything from jewellery to electronics. For this reason it is very important for geologists to be able to develop efficient methods for identification, characterisation, extraction and processing of copper. One method for the identification of copper bearing minerals is ore microscopy which has been used in this paper along with a general introduction. Samples from the study collection of the Department of Earth Sciences and the area of Långban and Månhöjden have been examined, documented and described in detail. The thesis begins with an introduction to the history and geochemistry of copper along with some ore forming processes.
Subjects/Keywords: Copper; Minerals; Microscope
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Manager
APA (6th Edition):
Hjeltström, A. (2015). Copper minerals under the microscope. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hjeltström, Anna. “Copper minerals under the microscope.” 2015. Thesis, Uppsala University. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hjeltström, Anna. “Copper minerals under the microscope.” 2015. Web. 14 Dec 2019.
Vancouver:
Hjeltström A. Copper minerals under the microscope. [Internet] [Thesis]. Uppsala University; 2015. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hjeltström A. Copper minerals under the microscope. [Thesis]. Uppsala University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
28.
Yuan, Xiu.
Kinetics and mechanism of copper transformations in natural waters at circumneutral pH.
Degree: Civil & Environmental Engineering, 2014, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/53562
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12259/SOURCE02?view=true
► The redox chemistry of copper in natural aquatic systems is of great interest due to its significance to the biogeochemistry of copper, an essential micronutrient,…
(more)
▼ The redox chemistry of
copper in natural aquatic systems is of great interest due to its significance to the biogeochemistry of
copper, an essential micronutrient, and also due to the formation of reactive oxygen species (ROS) during these redox reactions. Despite this, many knowledge gaps pertaining to the redox transformations of
copper exist, particularly in systems containing oxygen where
copper species may be simultaneously oxidized and reduced. In order to improve our understanding of
copper redox chemistry under conditions typical of oxic natural waters, the oxidation kinetics of nanomolar concentrations of Cu(I) in NaCl solutions was firstly investigated over the pH range 6.5 – 8.0. The overall apparent oxidation rate constant was strongly affected by chloride, moderately by bicarbonate and, to a lesser extent, by pH. Two kinetic models have been developed, using both the speciation-based approach and the so-called “CuL” approach with both models validating the conclusions that i) the oxidation of Cu(I) by oxygen and superoxide are important pathways at all pH values and chloride concentrations considered and ii) the simultaneous oxygenation of Cu+, CuClOH– and CuCO3– is the rate-limiting step in the overall oxidation of Cu(I) with the back reduction of Cu(II) by superoxide only becoming important at low chloride concentrations.As electron-transfer mediators, quinone moieties play important roles in essential biogeochemical processes and serve as a vital link in the movement of electrons through cells and tissues.
Copper has previously been shown to catalyze the oxidation of hydroquinones and enhance the hydroquinone-induced cytotoxicity. As such, in the second phase of the project, the oxidation of 1,4-hydroquinone (H2Q) and 1,4-naphthohydroquinone (NH2Q) in the absence and presence of nanomolar concentrations of Cu(II) in NaCl solutions at circumneutral pH has been investigated. While the autoxidation of H2Q is slow under the conditions studied, the autoxidation of NH2Q is significant with the apparent oxidation rate increasing with increasing pH and the initial NH2Q concentration. The results also show that under aerobic conditions,
copper is capable of catalyzing the oxidation of H2Q and NH2Q, with concomitant oxygen consumption and peroxide generation. The presence of O2 facilitated the catalytic role of Cu(II) with regeneration of Cu(II) via continuous oxidation of Cu(I) and rapid removal of semiquinone radicals resulting in the generation of superoxide. Detailed kinetic models have been developed to describe the predominant mechanisms operative in these systems. The half-cell reduction potentials of different redox couples indicated good agreement between thermodynamic and kinetic considerations of various key reactions involved, further providing confirmation of the veracity of the proposed models describing the interactions of
copper and quinone species in circumneutral pH saline solutions.
Advisors/Committee Members: Waite, David, Civil & Environmental Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Redox; Copper; Kinetics
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APA (6th Edition):
Yuan, X. (2014). Kinetics and mechanism of copper transformations in natural waters at circumneutral pH. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53562 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12259/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Yuan, Xiu. “Kinetics and mechanism of copper transformations in natural waters at circumneutral pH.” 2014. Doctoral Dissertation, University of New South Wales. Accessed December 14, 2019.
http://handle.unsw.edu.au/1959.4/53562 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12259/SOURCE02?view=true.
MLA Handbook (7th Edition):
Yuan, Xiu. “Kinetics and mechanism of copper transformations in natural waters at circumneutral pH.” 2014. Web. 14 Dec 2019.
Vancouver:
Yuan X. Kinetics and mechanism of copper transformations in natural waters at circumneutral pH. [Internet] [Doctoral dissertation]. University of New South Wales; 2014. [cited 2019 Dec 14].
Available from: http://handle.unsw.edu.au/1959.4/53562 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12259/SOURCE02?view=true.
Council of Science Editors:
Yuan X. Kinetics and mechanism of copper transformations in natural waters at circumneutral pH. [Doctoral Dissertation]. University of New South Wales; 2014. Available from: http://handle.unsw.edu.au/1959.4/53562 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12259/SOURCE02?view=true
University of New South Wales
29.
Colwell, Jack.
Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells.
Degree: Photovoltaics & Renewable Energy Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/61943
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57833/SOURCE02?view=true
► Employing copper (Cu) plating as an alternative to screen-printed silver (Ag) for silicon (Si) solar cells can offer significant cost benefits. However, concerns that Cu…
(more)
▼ Employing
copper (Cu) plating as an alternative to screen-printed silver (Ag) for silicon (Si) solar cells can offer significant cost benefits. However, concerns that Cu may penetrate through nickel (Ni) barrier layers into Si where it impacts cell performance and module durability have contributed to the limited adoption of plated metallisation in manufacturing. This thesis aimed to investigate the thermal stability of Cu-plated Si solar cells with a particular focus on cells with Ni/Cu grids plated on openings formed by selective-ablation of the antireflection coating using a UV ps laser.The formation of Cu precipitates in float-zone-Si was investigated using advanced lifetime spectroscopy of temperature and injection-dependent lifetime curves, with two defect levels identified at Et-Ei = −(0.14-0.16) eV and Et-Ei = (0.08-0.11) eV. Different capture cross-section ratios were obtained for Cu precipitates formed under illumination (k = 1.4 ± 0.2) and ingot-grown precipitates (k = 5.6 ± 1.4). A power-law dependence of the capture cross section was identified (with α=1.35-2.54) and α was observed to increase with increasing precipitate size/density, the latter being theorised to be related to the faster precipitation rate under illumination generating smaller precipitates.A physics of failure methodology was used to characterise Cu diffusion from plated contacts and degradation in Cu-plated p-type PERC and n-type PERT solar cells during thermal testing. Significant Cu diffusion through Ag capping layers was observed during treatments at 200 °C, the extent of the diffusion depending on the capping layer microstructure. Voids which formed as a result of Cu diffusion distorted Suns-VOC measurements, leading to 5-10% errors in the measured pseudo fill factor of the cells. Cross-sectional imaging (FIB/TEM/EDS) and LA-ICP-MS were used to identify that Ni and Cu can penetrate into Si on heating, with increased Ni/Cu detection correlated with increased electrical degradation. Finally, thermal treatments both in the dark and under illumination revealed increased degradation of p-type PERC cells under illumination due to Cu-LID, whilst non-uniformities in the laser-ablation and Ni barrier formation were proposed as the most probable reasons for the observed variable thermal stability of Cu-plated contacts to the p-type PERC and n-type PERT cells.
Advisors/Committee Members: Lennon, Alison, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Hameiri, Ziv, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Degradation; Plating; Copper
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APA (6th Edition):
Colwell, J. (2018). Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61943 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57833/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Colwell, Jack. “Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells.” 2018. Doctoral Dissertation, University of New South Wales. Accessed December 14, 2019.
http://handle.unsw.edu.au/1959.4/61943 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57833/SOURCE02?view=true.
MLA Handbook (7th Edition):
Colwell, Jack. “Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells.” 2018. Web. 14 Dec 2019.
Vancouver:
Colwell J. Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2019 Dec 14].
Available from: http://handle.unsw.edu.au/1959.4/61943 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57833/SOURCE02?view=true.
Council of Science Editors:
Colwell J. Copper and Silicon: Implications for the Long-term Stability of Plated Contacts for Silicon Solar Cells. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/61943 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57833/SOURCE02?view=true
Victoria University of Wellington
30.
Barassi, Giancarlo.
A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation.
Degree: 2013, Victoria University of Wellington
URL: http://hdl.handle.net/10063/2639
► This study presents a significant advancement in the understanding of the uptake of Cu2+ by nanostructured calcium silicate (NCaSil) and to develop a strategy of…
(more)
▼ This study presents a significant advancement in the understanding of the uptake of Cu2+ by
nanostructured calcium silicate (NCaSil) and to develop a strategy of using it in a continuous
manner using packed columns. The NCaSil structure consists of micro-sized agglomeration of
nanometre-sized platelets of calcium silicate. This arrangement grants the material a large
surface area of 400 to 600 m2 g-1.
The kinetics and thermodynamics of the adsorption of Cu2+ onto NCaSil in batch were studied
at temperatures ranging from 277 to 333 K. The reaction between Cu2+ and NCaSil occurred
rapidly, being endothermic and exhibiting an increase in the entropy meaning that the
adsorption process became more spontaneous when the temperature was increased.
Furthermore, the uptake resulted in the formation of
copper sulfate hydroxide minerals in the
form of Cu4(OH)6SO4·nH2O, where n is equal to 2 for wroewolfeite, 1 for posnjakite and 0
for brochantite. Using powder X-ray diffraction and scanning electron microscopy it was
proven that at temperatures between 293 and 313 K wroewolfeite and posnjakite were
intermediates in the formation of brochantite. Specifically at high temperatures of 333 K and
Cu2+ concentrations higher than 15.7 mmol L-1 the reaction proceeded directly to the
formation of the thermodynamically stable compound brochantite. A kinetic study of the
crystal growth was carried out using powder-XRD which showed that the rate determining
step towards the formation of brochantite is the nucleation of SO4
2-. Additionally, a value for
the activation energy of 42 kJ mol-1 using powder-XRD data was obtained for the formation
of the crystallographic plane 420 in the brochantite crystal.
A sample of a real mining waste was collected and analysed. Based on this sample an
emulated waste was generated. The NCaSil was tested for the uptake of Cu2+ ions from this
emulated mining waste, showing that the use of NCaSil is feasible at pH values greater than 3.
The production and use of NCaSil may be coupled to existing mining waste treatment
processes in order to remove dissolved
copper from solution and produce a
copper rich solid
as the by-product.
NCaSil was packed inside a conventional axial flow column and a radial flow column, which
was developed as part of this project. The former proved to be impractical due to a large
pressure drop through the column, while the latter was impractical due to short operational
times before breakthrough. Nonetheless, the radial flow column was operated by immersion
in a tank exhibiting similar kinetics of
copper ions uptake to those observed in batch
processes. Therefore, the scale-up of this process was proposed including the necessary
equations keeping the ratio of the tested radial flow column.
Advisors/Committee Members: Johnston, James.
Subjects/Keywords: Copper; Brochantite; Adsorption
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APA (6th Edition):
Barassi, G. (2013). A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/2639
Chicago Manual of Style (16th Edition):
Barassi, Giancarlo. “A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation.” 2013. Doctoral Dissertation, Victoria University of Wellington. Accessed December 14, 2019.
http://hdl.handle.net/10063/2639.
MLA Handbook (7th Edition):
Barassi, Giancarlo. “A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation.” 2013. Web. 14 Dec 2019.
Vancouver:
Barassi G. A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2013. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10063/2639.
Council of Science Editors:
Barassi G. A Study of the Uptake of Cu²⁺ by Calcium Silicate by Batch and Continuous Reactors for Potential Commercialisation. [Doctoral Dissertation]. Victoria University of Wellington; 2013. Available from: http://hdl.handle.net/10063/2639
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Open Access Theses and Dissertations
