Thematische Bibliographien / Cobalt compounds

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Auswahl der wissenschaftlichen Literatur zum Thema „Cobalt compounds“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 28. Januar 2023

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Zeitschriftenartikel zum Thema "Cobalt compounds"

Thomas, Nicholas C., Katrina Pringle und Glen B. Deacon. „Cobalt(II) and cobalt(III) coordination compounds“. Journal of Chemical Education 66, Nr. 6 (Juni 1989): 516. http://dx.doi.org/10.1021/ed066p516.

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Ávila-Torres, Yenny, Lázaro Huerta und Noráh Barba-Behrens. „XPS-Characterization of Heterometallic Coordination Compounds with Optically Active Ligands“. Journal of Chemistry 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/370637.

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The heterometallic optical complexes [Cu2Co(S,S(+)cpse)3(H2O)3]·4H2O (1) and [Cu2Ni(S,S(+)cpse)3(H2O)3]·10H2O (2) were obtained from the mononuclear copper(II) compound by the addition of nickel(II) or cobalt(II) chlorides, where (H2cpse) is the acetyl amino alcohol derivative N-[2-hydroxy-1(R)-methyl-2(R)-phenylethyl]-N-methylglycine. In comparison with the homotrinuclear copper(II) compound [Cu3(S,S(+)cpse)3(H2O)3]·8H2O reported previously, the substitution of a copper(II) atom by one cobalt(II) ion gave place to a heterotrinuclear compound1, which presents ferromagnetic-antiferromagnetic behaviour. When substituting a copper(II) by a nickel(II) ion, the trinuclear compound2showed an antiferromagnetic coupling. The magnetic behaviour of the heterotrinuclear compounds is driven by the nature of the metal ion which was introduced in the copper(II) triangular array. The ligand and its coordination compounds were characterized by IR, UV-Vis-NIR. Their chemical was confirmed by photoelectron spectroscopy (XPS).

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Tang, Yao, Zhao Lin Zhan, Xiao Hua Yu, Miao Ma und Xiao Yu Li. „Development and Application of Manganese Cobalt Lithium Compounds in the Field of Lithium Batteries“. Advanced Materials Research 1088 (Februar 2015): 275–78. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.275.

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Manganese lithium cobalt compounds have been used in the preparation of lithium battery cathode material because of its excellent electrochemical characteristics and gradually in recent years. This paper introduces the different methods of preparing the compounds, analyzes the structural characteristics of the manganese cobalt lithium compounds and the differences in the electrochemical properties, the end of the article has carried on the forecast to the future development direction of the compound.

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Djordjevic, Milena, Dejan Jeremic, Katarina Andjelkovic, Maja Gruden-Pavlovic, Vladimir Divjakovic, Maja Sumar-Ristovic und Ilija Brceski. „Cobalt(II) and cadmium(II) compounds with adamantane-1-sulfonic acid“. Journal of the Serbian Chemical Society 77, Nr. 10 (2012): 1391–99. http://dx.doi.org/10.2298/jsc120419051d.

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In this work we reported syntheses and characterization of two novel compounds of adamantane-1-sulfonic acid (1-AdSO3H) with cobalt(II) and cadmium(II), respectively. The result of the single crystal X-ray analysis of compounds revealed that adamantane-1-sulfonate (1-AdSO3 -) in monoanionic form plays a different role in investigated compounds. Namely, while in compound [Co(H2O)6](1-AdSO3)2 six water molecules are coordinated to cobalt(II) ion and 1-AdSO3 - serves as a counter ion, in compound [Cd(H2O)4(1-AdSO3)2] two molecules of 1-AdSO3 - are trans-coordinated to the cadmium(II) ion as monodentate (O) ligand and other coordination sites are occupied by water molecules. The obtained compounds showed a moderate activity against Artemia salina.

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Gluhcheva, Yordanka, Vasil Atanasov, Juliana Ivanova und Ekaterina Pavlova. „Chronic exposure to cobalt compounds — an in vivo study“. Open Life Sciences 9, Nr. 10 (01.10.2014): 973–81. http://dx.doi.org/10.2478/s11535-014-0334-x.

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AbstractAn in vivo experimental model for testing the effects of long-term chronic treatment with cobalt(II) compounds — cobalt chloride (CoCl2) and cobalt-EDTA (Co-EDTA) on mice at different stages of development was optimized. Pregnant mice and their progeny were treated with daily doses of 75 or 125 mg kg−1 body weight until postnatal day 90. The compounds were dissolved in regular tap water. Mice were sacrificed on days 18, 25, 30, 45, 60 and 90 after birth, which correspond to different stages of their development. Altered organ weight indices (calculated as a ratio of organ weight to body weight) of spleen, liver and kidneys, were found depending on the type of compound used, dose, duration of treatment, and the age of the animals. The results also showed significant accumulation of cobalt ions in blood plasma, spleen, liver and kidneys of the exposed mice. More Co(II) was measured in the organs of the immature mice (day 18, 25 and 30 pnd) indicating that they were more sensitive to treatment.

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Ishikawa, T., und E. Matijević. „Formation of uniform particles of cobalt compounds and cobalt“. Colloid & Polymer Science 269, Nr. 2 (Februar 1991): 179–86. http://dx.doi.org/10.1007/bf00660309.

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Stopford, Woodhall, John Turner, Danielle Cappellini und Tom Brock. „Bioaccessibility testing of cobalt compounds“. Journal of Environmental Monitoring 5, Nr. 4 (2003): 675. http://dx.doi.org/10.1039/b302257a.

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Filipczyk, Grzegorz, Steve W. Lehrich, Alexander Hildebrandt, Tobias Rüffer, Dieter Schaarschmidt, Marcus Korb und Heinrich Lang. „Multiferrocenyl Cobalt-Based Sandwich Compounds“. European Journal of Inorganic Chemistry 2017, Nr. 2 (05.10.2016): 263–75. http://dx.doi.org/10.1002/ejic.201600848.

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Harwell, David E., Juliet Nabakka, Carolyn B. Knobler und M. Frederick Hawthorne. „Synthesis and structural characterization of an ether-bridged cobalta-bis(dicarbollide): a model for Venus flytrap cluster reagents“. Canadian Journal of Chemistry 73, Nr. 7 (01.07.1995): 1044–49. http://dx.doi.org/10.1139/v95-129.

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The synthesis of bis-(1-carboranylmethyl) ether was first published in 1963; however, its subsequent complexation with a transition metal was never reported. We now report the complexation of cobalt and the corresponding X-ray structure for the triphenylmethylphosphonium salt of the cobalta-bis(carboranylmethyl) ether. The cobalt complex crystallized in the monoclinic space group C2/c with a = 21.729(6) Å, b = 9.845(2) Å, c = 35.565(9) Å, β = 105.363(9)°, V = 7336 Å3, and Z = 8. Data were collected using CuKα radiation, to a maximum 2θ = 115°, giving 4123 unique reflections, and the structure was solved by heavy atom methods. The final discrepancy index was R = 0.093, Rw = 0.100 for 1919 independent reflections with I > 3σ(I). This metala-bis(carboranylalkyl) ether is the first in a new class of Venus flytrap compounds (VFC), containing an ether linkage, to be synthesized as model compounds for the development of reagents suitable for use in the radioimmunodetection and radioimmunotherapy of cancer. Keywords: cobalt, radioimmunodetection, radioimmunotherapy, Venus flytrap.

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Krebs, Christoph, Inke Jess, Magdalena Ceglarska und Christian Näther. „Crystal structure of diethanolbis(thiocyanato)bis(urotropine)cobalt(II) and tetraethanolbis(thiocyanato)cobalt(II)–urotropine (1/2)“. Acta Crystallographica Section E Crystallographic Communications 78, Nr. 1 (01.01.2022): 66–70. http://dx.doi.org/10.1107/s2056989021013281.

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The reaction of one equivalent Co(NCS)2 with four equivalents of urotropine (hexamethylenetetramine) in ethanol leads to the formation of two compounds, namely, bis(ethanol-κO)bis(thiocyanato-κN)bis(urotropine-κN)cobalt(II), [Co(NCS)2(C6H12N4)2(C2H6O)2] (1), and tetrakis(ethanol-κO)bis(thiocyanato-κN)cobalt(II)–urotropine (1/2), [Co(NCS)2(C2H6O)4]·2C6H12N4 (2). In 1, the Co cations are located on centers of inversion and are sixfold coordinated by two terminal N-bonded thiocyanate anions, two ethanol and two urotropine ligands whereas in 2 the cobalt cations occupy position Wyckoff position c and are sixfold coordinated by two anionic ligands and four ethanol ligands. Compound 2 contains two additional urotropine solvate molecules per formula unit, which are hydrogen bonded to the complexes. In both compounds, the building blocks are connected via intermolecular O—H...N (1 and 2) and C—H...S (1) hydrogen bonding to form three-dimensional networks.

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Dissertationen zum Thema "Cobalt compounds"

Ng, Jesse B. „Mono- and binuclear cobalt hydrides“. Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30789.

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The homogeneous hydrogenation of arenes with functional groups was studied with allylcobalt complexes containing the bulky chelating diphosphines dippp (1,3-bis(diisopropylphosphino)propane and dippcyp (trans-(±)-l,2-bis(diisopropylphos-phino)cyclopentane). The results indicated that these catalyst precursors were unsuitable for the hydrogenation reactions, being too sensitive to the nature of the substrate. From these hydrogenation reactions, the intermediates (η⁵-cyclohexadienyl)Co(dippcyp) (10) and (η⁴-2-methoxynaphthalene)Co(H)(dippcyp) (11) were isolated and structurally characterized, thus providing some insight into the mechanism of the hydrogenation reaction. The production of binuclear hydrides such as [(dippp)CoH₂]₂ (4) and [(dippcyp)CoH₂]₂ (9) was observed to lead to the end of the catalysis. An X-ray structural characterization of the blue hydride [(dippp)CoH₂]₂ (4) showed that in the solid state it is binuclear. Although the complex is diamagnetic in the solid state (6-280 K), in solution its paramagnetic behaviour could only be attributed to an equilibrium with a second species proposed to be mononuclear, (dippp)CoH₂. In addition, a cyclic voltammogram of the complex in solution indicated that the predominant species still was the binuclear compound [(dippp)CoH₂]₂ (4). One of the syntheses of [(dippp)CoH₂]₂ (4) gave a product identified as (dippp)CoH₃ (5). Based on variable-temperature spin-lattice relaxation time (T₁) measurements and an electrochemical study, this red hydride complex appeared to contain an η²-H₂ ligand. The relationship of this complex with the blue hydride apparently involves the mononuclear species, (dippp)CoH₂. Independent pathways led to the formation of both the blue and red hydrides, and these pathways are discussed in terms of possible mechanisms.
Science, Faculty of
Chemistry, Department of
Graduate

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Cooke, Michael D. „Magnetostrictive properties of polycrystalline iron cobalt films“. Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340249.

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DuPont, Julie A. „The coordination chemistry of thioether-supported, low-valent cobalt complexes“. Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 3.92 Mb., 165 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3200521.

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Liao, Lexiang. „Cobalt site preferences in iron rare-earth based compounds“. Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39786.

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This thesis presents the first systematic study of the cobalt site preferences in iron rare-earth based compounds. The Mossbauer source technique employed in this work offers a direct and unambiguous way to quantitatively determine cobalt site preferences in these compounds at extremely low cobalt contents. Data quality as well as counting efficiency for the source ($ sp{57}$Co doped) samples is enhanced by constructing a resonant conversion electron detector utilising 90% $ sp{57}$Fe enriched stainless steel foil. Our results have produced the most convincing evidence that cobalt substitutes preferentially for iron in these compounds. We have demonstrated that the site volume is the dominant factor controlling the preferential cobalt substitutions at transition-metal sites with volume $<$12.2A$ sp3$. The cobalt preference for a site decreases linearly with increasing site volume at a rate of $ sim$0.9A$ sp{-3}$. In general, cobalt shows a preference for sites with volume $<$11.8A$ sp3$. As site volume becomes sufficiently large ($ ge$12.2A$ sp3$), the negative enthalpy of mixing between cobalt and rare-earth plays a significant role in modifying the cobalt site preferences in combination with the site volume effects. This results in cobalt preferring strongly those sites with the highest number of rare-earth nearest-neighbors.

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尹業高 und Yegao Yin. „The preparation and structure determination of some copper, cobalt, iron and manganese complexes and the study of their properties“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235463.

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Yin, Yegao. „The preparation and structure determination of some copper, cobalt, iron and manganese complexes and the study of their properties /“. Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19668570.

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Xiao, Jie. „Layered lithium nickel manganese cobalt dioxide as a cathode material for Li-ion batteries“. Diss., Online access via UMI:, 2008.

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Wang, Hongli. „A study of the structural, microstructural and magnetic properties of iron-platinum and cobalt-platinum type nanoparticles“. Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 200 p, 2007. http://proquest.umi.com/pqdweb?did=1354136761&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Doddridge, Bruce Germein. „Ligand exchange and substitution on five-coordinate complexes of copper (II), nickel (II) and cobalt (II) /“. Title page, contents and summary only, 1986. http://web4.library.adelaide.edu.au/theses/09PH/09phd641.pdf.

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Mitchell, Glenn Antony. „Thermal behaviour of some cobalt (II) carboxylates and related compounds“. Thesis, University of Huddersfield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357725.

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Bücher zum Thema "Cobalt compounds"

Cobalt: Characteristics, compounds, and applications. Hauppauge, N.Y: Nova Science Publishers, 2011.

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IARC Working Group on the Evaluation of Carcinogenic Risks to Humans. Chlorinated drinking-water, chlorination by-products: Some other halogenated compounds, cobalt and cobalt compounds. Lyon, France: International Agency for Research on Cancer, 1991.

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J, Jacobs J., Hrsg. Nickel and cobalt extraction using organic compounds. Oxford: Pergamon Press, 1985.

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Strauss, Christian. Synthese und Reaktionen von Pentamethylcyclopentadienyl-Cobalt-Verbindungen. Konstanz: Hartung-Gorre, 1987.

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Singh, Jag J. Investigation of the effects of cobalt ions on epoxy properties. Hampton, Va: Langley Research Center, 1986.

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Mitchell, Glenn Antony. Thermal behaviour of some cobalt (II) carboxylates and related compounds. Huddersfield: The Polytechnic, 1991.

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H, Kim James, Gibb Herman J, Howe Paul D, Sheffer Marla, United Nations Environment Programme, International Labour Organisation, Inter-Organization Programme for the Sound Management of Chemicals. und World Health Organization, Hrsg. Cobalt and inorganic cobalt compounds. Geneva: World Health Organization, 2006.

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Evans, P., K. Campion und S. Fairhurst. Cobalt and Cobalt Compounds (TR) (Toxicity Review). Health and Safety Executive (HSE), 1993.

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Yıldız, Yasemin, und Aynur Manzak, Hrsg. Cobalt Compounds and Applications. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.81986.

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World Health Organization (WHO). Cobalt and Inorganic Cobalt Compounds (Concise International Chemical Assessment Document). World Health Organization, 2006.

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Buchteile zum Thema "Cobalt compounds"

Macintyre, J. E. „Co Cobalt“. In Dictionary of Organometallic Compounds, 86–109. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-6847-6_11.

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MacIntyre, Jane E. „Co Cobalt“. In Dictionary of Organometallic Compounds, 57–66. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-6848-7_12.

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Macintyre, J. E., F. M. Daniel, D. J. Cardin, S. A. Cotton, R. J. Cross, A. G. Davies, R. S. Edmundson et al. „Co Cobalt“. In Dictionary of Organometallic Compounds, 39–50. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4966-3_12.

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Nagy, Zoltán. „Co—Cobalt“. In Electrochemical Synthesis of Inorganic Compounds, 72–75. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_17.

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Freeman, Fillmore. „Oxidations by Cobalt Compounds“. In Organic Syntheses by Oxidation with Metal Compounds, 315–71. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2109-5_5.

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Steinbrunn, A., M. Bindo und J. C. Colson. „Electrical Conductivity Study of Cobalt Molybdate CoMoO4“. In Non-Stoichiometric Compounds, 163–71. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0943-4_12.

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Pardasani, R. T., und P. Pardasani. „Magnetic properties of cobalt(II) diphosphonate“. In Magnetic Properties of Paramagnetic Compounds, 745. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_404.

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Pardasani, R. T., und P. Pardasani. „Magnetic properties of cobalt(II) hydroxide nitrate“. In Magnetic Properties of Paramagnetic Compounds, 1123–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_668.

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Pardasani, R. T., und P. Pardasani. „Magnetic properties of (tetrabenzoporphyrinato)cobalt(II) iodide“. In Magnetic Properties of Paramagnetic Compounds, 1125–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_669.

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Pardasani, R. T., und P. Pardasani. „Magnetic properties of dinuclear cobalt(II) diphosphonate“. In Magnetic Properties of Paramagnetic Compounds, 1193. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_706.

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Konferenzberichte zum Thema "Cobalt compounds"

Petkova, Petya, Youri Tzoukrovsky und Petko Vasilev. „Lorentz dispersion model of cobalt containing compounds“. In HIGH ENERGY GAMMA-RAY ASTRONOMY: 6th International Meeting on High Energy Gamma-Ray Astronomy. Author(s), 2017. http://dx.doi.org/10.1063/1.4972369.

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Suwa, Hidekazu, Sora Nishiinoue, Kensuke Koseki, Iduru Shigeta, Masakazu Ito, Masahiko Hiroi, Hirotaka Manaka und Norio Terada. „Study on the Half-Heusler Compounds Co1+δTiSb with Excess Cobalt“. In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013). Journal of the Physical Society of Japan, 2014. http://dx.doi.org/10.7566/jpscp.3.017017.

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Zhang, D., S. Yang, Z. Chen, L. Feng, W. Huang, W. Zhao, S. Dong und X. Li. „Multiferroic properties of neodymium and cobalt co-doped four-layer Aurivillius compounds“. In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156528.

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Yamskikh, A. A., und L. A. Ivanova. „Synthesis of chelated compounds of amino acids with metals“. In VIII Vserossijskaja konferencija s mezhdunarodnym uchastiem «Mediko-fiziologicheskie problemy jekologii cheloveka». Publishing center of Ulyanovsk State University, 2021. http://dx.doi.org/10.34014/mpphe.2021-251-254.

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The article describes the reactions of glycine synthesis with alkaline, alkaline-earth and divalent 3-d metals, which were carried out during the experiment. Hydroxides or sulfates of lithium, magnesium, calcium, manganese, iron, copper, zinc, cobalt and sodium were used as reagents for the synthesis. The physicochemical properties of the obtained compounds were studied. Keywords: chelates, glycinates of alkaline and alkaline earth metals, glycinates of divalent 3-d metals.

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Ilyushin, Mikhail, Irina Shugalei, Andrey Tverjanovich, Juliya Pavlyukova, Zoya Kapitonenko, Andrey Smirnov und Igor Tselinskiya. „COMMUNICATION OF INITIAL STAGES OF DECOMPOSITION OF LIGANDS OF AMMINE TETRAZOLATES COBALT (III) WITH THE INITIATING ABILITY OF COMPLEXES“. In Chemistry of nitro compounds and related nitrogen-oxygen systems. LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m790.aks-2019/347-351.

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Inoue, Fumihiro, Jaber Derakhshandeh, Carine Gerets und Eric Beyne. „Cobalt-Tin Intermetallic Compounds as Alternative Surface Finish for Low Temperature Die-to-Wafer Solder Stacking“. In 2021 International Conference on Electronics Packaging (ICEP). IEEE, 2021. http://dx.doi.org/10.23919/icep51988.2021.9451972.

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Sakata, K., K. Nakano, H. Miyahara, Y. Matsubara und K. Ogi. „Microstructure Control of Thermally Sprayed Co-based Self-fluxing Alloy Coatings by Diffusion Treatment“. In ITSC2007, herausgegeben von B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima und G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p1023.

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Abstract This paper describes microstructure control aimed for wear-resistance improvement of Co-based (Co-Cr-W-B-Si) self-fluxing alloy coating by diffusion treatment. The diffusion treatments of thermally sprayed Co-based self-fluxing alloy coating on steel substrate were carried out at 1370K to 1450K for 600s to 6000s under an Ar gas atmosphere. Microstructural variations of the coating and the interface between the substrate and the coating were investigated in detail. A proper diffusion treatment precipitates two kinds of fine compounds in Co-based matrix. XRD and EPMA analysis revealed these precipitates to be a chromium boride dissolving cobalt and a wolfram boride containing cobalt and chromium. The size of each precipitate became larger with increasing treatment temperature and time. A coating with the proper size borides showed a superior wear-resistance.

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Jin, Zhiyi, Zhenqiang Yao und Hong Shen. „Investigation on Mechanical Properties and Corrosion Resistance of Cobalt-Based Alloy Cladding Layer“. In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11104.

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Abstract Austenitic stainless steel was cladded with Cobalt-based alloy by means of Tungsten inert gas (TIG) welding to improve the performance of the working parts such as the thrust bearing plates under dynamic loads and corrosive liquid. Specimens were prepared with different welding parameters, namely the cladding current, preheating temperature, inter-layer temperature and post heat treatment temperature, so as to investigate their influence on micro-hardness, as well as tensile and bending strength. It is revealed that the lower welding current coincides with higher micro-hardness as well as tensile and bending strength. The higher inter-layer temperature will result inhigher overlay micro-hardness. The post weld heat treatment temperature influences the bending strength of the overlay weld specimens. In addition, the accumulation of Cr and Ni compounds on weldment surface is found to coincide with higher corrosion resistance in over-layers by means of XRD.

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Asmatulu, R., A. Garikapati, H. E. Misak, Z. Song, S. Y. Yang und P. Wooley. „Cytotoxicity of Magnetic Nanocomposite Spheres for Possible Drug Delivery Systems“. In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40269.

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Cytotoxicity test is a rapid and standardized in vitro method to determine the harmful effects of materials used for biomedical purposes, such as drug carriers, implants and their coatings, biosensors and surgical/medical devices. In the present study, sol-gel driven nickel ferrite (NiFe2O4) and cobalt ferrite (CoFe2O4) nanoparticles (10–25 nm) at different concentrations were incorporated into biodegradable polymer, poly(lactic-co-glycolic acid) (PLGA), using oil-in-oil emulsion/solvent evaporation technique, and then the cytotoxicity of magnetic nanocomposite spheres was characterized using raw cells. The test provides the toxicity of the products prior to their real applications, which may limit animal experimentation, remove potential toxic compounds and reduce the downstream costs. The cytotoxicity results showed that both magnetic nanocomposite spheres were toxic at some degree to the raw cells; however, the cobalt ferrite nanoparticles in nanocomposite spheres are more toxic than the nickel ferrite nanoparticles.

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Baiamonte, L., G. Pulci, E. Hlede, C. Bartuli, T. Valente und F. Marra. „Self-Lubricating Cobalt-Based Composite Coatings Deposited by Plasma Transferred Arc“. In ITSC2017, herausgegeben von A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen und C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p1153.

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Abstract Wear-resistant cobalt–based alloy (Stellite 12) coatings deposited by plasma transferred arc (PTA), commonly used to protect critical mechanical components in harsh environments, were modified by addition of hard ceramic particles (TiC) and solid lubricant compounds (MoS2 and CaF2) to improve the overall tribological performance. In this preliminary study, microstructural, microhardness and tribological analyses were carried out to assess: a) the feasibility of PTA deposition of thermally sensitive phases characterised by very low density; b) the effect of the addition of a mixture of soft and hard phases on the coating hardness; c) the effect of the modified composition in terms of wear resistance; d) the effect of the addition in terms of lubrication (friction coefficient and produced heat). Results showed that: a) an appropriate pre-consolidation of feedstock materials can be effective in preserving the heat-sensitive phases within the microstructure of PTA deposits; b) the addition of a total amount of 5% wt. of solid lubricants and reinforcing carbides produced a limited decrease in the coating hardness (about 13%) and an evident improvement in terms of friction coefficient but, on the other hand, a remarkable reduction (about 30%) in wear resistance. Further investigation will be addressed to optimize the composition of modified feedstock to counteract the softening effect of lubricant phases without depressing the self-lubrication behaviour.

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Berichte der Organisationen zum Thema "Cobalt compounds"

Leighton, Chris. Novel Ground States and Phase Transitions in Cobalt-Based Compounds and Heterostructures. Final report, 03/15/2006 - 03/14/2019. Office of Scientific and Technical Information (OSTI), November 2019. http://dx.doi.org/10.2172/1575888.

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