Borchers, Christine

[["dc.bibliographiccitation.artnumber","065115"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","AIP Advances"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Borchers, C."],["dc.contributor.author","Martin, M. L."],["dc.contributor.author","Vorobjeva, G. A."],["dc.contributor.author","Morozova, O. S."],["dc.contributor.author","Firsova, A. A."],["dc.contributor.author","Leonov, A. V."],["dc.contributor.author","Kurmaev, E. Z."],["dc.contributor.author","Kukharenko, A. I."],["dc.contributor.author","Zhidkov, I. S."],["dc.contributor.author","Cholakh, S. O."],["dc.date.accessioned","2019-09-24T07:35:27Z"],["dc.date.available","2019-09-24T07:35:27Z"],["dc.date.issued","2019"],["dc.description.abstract","Mechanochemical synthesis based on ball-milling of individual oxides was applied as a one-step preparation technique for CuO-CeO2 catalyst for preferential CO oxidation in H2 excess. The mechanical energy dose transferred to the original powder mixture determines both the catalyst composition and activity. It is found that after 90 min of milling (corresponding to a dose of 372 kJ mol–1), a mixture of 10 wt.% CuO-CeO2 powder exhibits a CO conversion of 97% at 423 K. Four active oxygen states, which are not observed in case of pure CeO2, were detected in the nanocomposite lattice and attributed to the presence of Cu in surface sites as well as in subsurface bulk sites of CeO2, in nearest neighbor and next nearest neighbor positions. Correspondingly, oxidation of CO to CO2 was found to occur in a two-stage process with Tmax = 395/460 K, and oxidation of H2 to H2O likewise in a four-stage process with Tmax = 426/448/468/516 K. The milled powder consists of CeO2 crystallites sized 8–10 nm agglomerated to somewhat larger aggregates, with CuO dispersed on the surface of the CeO2 crystallites, and to a lesser extent present as Cu2O."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2018"],["dc.identifier.doi","10.1063/1.5109067"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16255"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62437"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","2158-3226"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","CuO-CeO2 nanocomposite catalysts produced by mechanochemical synthesis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","292"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Journal of Thermal Spray Technology"],["dc.bibliographiccitation.lastpage","298"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Kliemann, J.-O."],["dc.contributor.author","Gutzmann, H."],["dc.contributor.author","Gaertner, Frank"],["dc.contributor.author","Huebner, H."],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Klassen, Thomas"],["dc.date.accessioned","2018-11-07T09:00:32Z"],["dc.date.available","2018-11-07T09:00:32Z"],["dc.date.issued","2011"],["dc.description.abstract","Titanium dioxide (TiO2) coatings have potential applications in biomedical implants or as photo-catalytic functional systems. Cold spraying is a well-established method for metal on metal coatings. In cold spraying, the required heat for bonding is provided by plastic deformation of the impacting ductile particles. In contrast, few authors have investigated the impact phenomena and layer formation process for spraying brittle ceramic materials on ductile metal surfaces. In this study, the formation of TiO2 coatings on aluminum, copper, titanium, and steel substrates was investigated by SEM, TEM, XRD, and Raman spectroscopy. The results show that the deposition efficiency depends on spray temperature, powder properties, and in particular on substrate ductility, even for impact of ceramic particles during a second pass over already coated areas. Ceramic particles bond to metallic substrates showing evidence of shear instabilities. High-resolution TEM images revealed no crystal growth or phase transitions at the ceramic/metal interfaces."],["dc.identifier.doi","10.1007/s11666-010-9563-3"],["dc.identifier.isi","000285421000034"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6825"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24190"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","New york"],["dc.relation.eventend","2010-05-05"],["dc.relation.eventlocation","Singapore, Singapore"],["dc.relation.eventstart","2010-05-03"],["dc.relation.issn","1544-1016"],["dc.relation.issn","1059-9630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.title","Formation of Cold-Sprayed Ceramic Titanium Dioxide Layers on Metal Surfaces"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","517"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Applied Physics. A, Materials Science & Processing"],["dc.bibliographiccitation.lastpage","526"],["dc.bibliographiccitation.volume","90"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Schmidt, T."],["dc.contributor.author","Gaertner, Frank"],["dc.contributor.author","Kreye, H."],["dc.date.accessioned","2018-11-07T11:17:20Z"],["dc.date.available","2018-11-07T11:17:20Z"],["dc.date.issued","2008"],["dc.description.abstract","Cold spraying is a new coating technique in which dense, tightly bonded coatings form only due to the high kinetic energy of impinging particles of the spray powder. These particles are still in the solid state during impact. Explosive powder compaction is a technique where powder is consolidated by a shock wave. In the shock front the powder is deformed under high strain rates, which under suitable conditions results in high-strength bonding of the particles. Thus, the microstructural features obtained by both techniques should be similar. This study correlates the microstructure of cold-sprayed 316L austenitic steel coatings in comparison to the microstructure of 316L samples obtained by explosive compaction. The results provide insight into the prevailing local deformation mechanisms, as well as into the physical background of observed phase transformations."],["dc.identifier.doi","10.1007/s00339-007-4314-0"],["dc.identifier.isi","000251821200022"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6712"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54778"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0947-8396"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.title","High strain rate deformation microstructures of stainless steel 316L by cold spraying and explosive powder compaction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1263"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Metals"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Edalati, Kaveh"],["dc.contributor.author","Li, Hai-Wen"],["dc.contributor.author","Kilmametov, Askar"],["dc.contributor.author","Floriano, Ricardo"],["dc.contributor.author","Borchers, Christine"],["dc.date.accessioned","2021-10-01T09:58:29Z"],["dc.date.available","2021-10-01T09:58:29Z"],["dc.date.issued","2021"],["dc.description.abstract","High-pressure torsion (HPT) is widely used not only as a severe plastic deformation (SPD) method to produce ultrafine-grained metals but also as a mechanical alloying technique to synthesize different alloys. In recent years, there have been several attempts to synthesize functional high-entropy alloys using the HPT method. In this paper, the application of HPT to synthesize high-entropy materials including metallic alloys, hydrides, oxides and oxynitrides for enhanced mechanical and hydrogen storage properties, photocatalytic hydrogen production and high light absorbance is reviewed."],["dc.description.abstract","High-pressure torsion (HPT) is widely used not only as a severe plastic deformation (SPD) method to produce ultrafine-grained metals but also as a mechanical alloying technique to synthesize different alloys. In recent years, there have been several attempts to synthesize functional high-entropy alloys using the HPT method. In this paper, the application of HPT to synthesize high-entropy materials including metallic alloys, hydrides, oxides and oxynitrides for enhanced mechanical and hydrogen storage properties, photocatalytic hydrogen production and high light absorbance is reviewed."],["dc.description.sponsorship","Ministry of Education, Culture, Sports, Science and Technology"],["dc.description.sponsorship","Volkswagen Stiftung"],["dc.identifier.doi","10.3390/met11081263"],["dc.identifier.pii","met11081263"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/90073"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-469"],["dc.publisher","MDPI"],["dc.relation.eissn","2075-4701"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","https://creativecommons.org/licenses/by/4.0/"],["dc.title","High-Pressure Torsion for Synthesis of High-Entropy Alloys"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]