Borchers, Christine

[["dc.bibliographiccitation.artnumber","104904"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Journal of Applied Physics"],["dc.bibliographiccitation.volume","110"],["dc.contributor.author","Shkvarin, A. S."],["dc.contributor.author","Yarmoshenko, Yu M."],["dc.contributor.author","Zatsepin, Nadia A."],["dc.contributor.author","Dolgikh, V. E."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Nemnonov, S. N."],["dc.contributor.author","Cherkashenko, V. M."],["dc.contributor.author","Skorikov, N. A."],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Borchers, Christine"],["dc.date.accessioned","2018-11-07T08:49:51Z"],["dc.date.available","2018-11-07T08:49:51Z"],["dc.date.issued","2011"],["dc.description.abstract","Titanium is well known as a light-weight hydrogen storage material that is applied as a component of hydrogen storage composites together with Mg and other metals. Amorphous boron, boron nitride, and graphite were used as additives to improve Ti-H(2) reactivity during ball-milling due to its anti-sticking and matrix-forming properties. The chemical state and local electronic structure of Ti atoms were studied by hard x-ray emission spectroscopy (XES). We have measured fluorescent Ti K beta(5) (4p -> 1s transition) x-ray emission spectra, which are very sensitive to the local surroundings of exciting atoms, and found additional features coinciding in energy with spectra of reference samples TiB(2), TiN, and TiC. Based on these measurements, it is concluded that atoms of additives form chemical bonding with Ti due to the occupation of interstitials in the host Ti-lattice. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3662200]"],["dc.description.sponsorship","Research Council of the Russian Federation [NSH-1929.2008.2]"],["dc.identifier.doi","10.1063/1.3662200"],["dc.identifier.isi","000297943700133"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21554"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0021-8979"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Effect of additives on titanium-hydrogen interaction under ball milling of Ti powder probed by hard x-ray emission spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","309"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Journal of Alloys and Compounds"],["dc.bibliographiccitation.lastpage","312"],["dc.bibliographiccitation.volume","483"],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Leonov, Alexander V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Moewes, A."],["dc.date.accessioned","2018-11-07T11:25:35Z"],["dc.date.available","2018-11-07T11:25:35Z"],["dc.date.issued","2009"],["dc.description.abstract","Mechanically activated TiH2/h-BN, TiH2/C and TiH2/B mixtures was studied by temperature-programmed desorption, X-ray diffraction, transmission electron microscopy and X-ray emission spectroscopy. Ball milling in the presence of additives results in a modification of hydrogen occupation sites. Additional Ti-N, Ti-C or Ti-B bonds from chemical bonding of Ti with interstitial N, C and B atoms, are formed in TiH2 due to contact of TiH2 nanoparticles with the respective additive matrix materials. Mixed configurations around Ti atoms with proportional combination of local Ti-H and Ti-N, Ti-C or Ti-B bonds significantly decrease the thermal stability of TiH2. The effect is most pronounced when boron is the additive. (C) 2008 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jallcom.2008.08.093"],["dc.identifier.isi","000270619600075"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56655"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Sa"],["dc.publisher.place","Lausanne"],["dc.relation.conference","14th International Symposium on Metastable and Nano-Materials"],["dc.relation.eventend","2007-08-30"],["dc.relation.eventlocation","Corfu, Greece"],["dc.relation.eventstart","2007-08-26"],["dc.relation.issn","0925-8388"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Effect of N, C and B interstitial atoms on local bonding structure in mechanically activated TiH2/h-BN, TiH2/C, and TiH2/B mixtures"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","240"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Journal of Alloys and Compounds"],["dc.bibliographiccitation.lastpage","246"],["dc.bibliographiccitation.volume","395"],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Nemnonov, S. N."],["dc.contributor.author","Harada, Y."],["dc.contributor.author","Tokushima, T."],["dc.contributor.author","Osawa, H."],["dc.contributor.author","Takeuchi, T."],["dc.contributor.author","Shin, S."],["dc.date.accessioned","2018-11-07T10:59:22Z"],["dc.date.available","2018-11-07T10:59:22Z"],["dc.date.issued","2005"],["dc.description.abstract","The local bonding structure of mechanically activated TiH2 and TiH2/graphite mixture is studied by means of temperature-programmed desorption (TPD), X-ray emission- and absorption-spectroscopy. Ball milling of TiH2 in the presence of graphite results in a modification of the hydrogen occupation sites. Additional Ti-C bonds from chemical bonding of Ti with carbon, which occupies octahedral interstitials, appears in TiH2 due to intimate contact between graphite and TiH2 nanoparticles embedded into an amorphous graphite matrix. Mixed configurations around Ti atoms with proportional combination of local Ti-H and Ti-C bonds significantly decrease the thermal stability of TiH2. © 2004 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jallcom.2004.11.031"],["dc.identifier.isi","000229410600044"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50682"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0925-8388"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Local bonding structure in mechanically activated TiH2 and TiH2 plus graphite mixture"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Journal of Nanoparticle Research"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Martin, May L."],["dc.contributor.author","Vorobjeva, Galina A."],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Firsova, Alla A."],["dc.contributor.author","Leonov, Alexander V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Kukharenko, Andrey I."],["dc.contributor.author","Zhidkov, Ivan S."],["dc.contributor.author","Cholakh, Seif O."],["dc.date.accessioned","2018-11-07T10:05:41Z"],["dc.date.available","2018-11-07T10:05:41Z"],["dc.date.issued","2016"],["dc.description.abstract","Catalytic systems designated for preferential oxidation of CO in the presence of H-2 are prepared by ball milling of Cu and CeO2, a simple and cheap onestep process to synthesize such catalysts. It is found that after 60 min of milling, a mixture of 8 wt.% Cu-CeO2 powders exhibits CO conversion of 96% and CO selectivity of about 65% at 438 K. Two 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. Correspondingly, oxidation of CO to CO2 was found to occur in a two-stage process with T-max approximate to 395/460 K, and oxidation of H-2 to H2O likewise in a two-stage process with T-max approximate to 465/490 K. The milled powder consists of CeO2 crystallites sized 810 nm agglomerated to somewhat larger aggregates, with Cu dispersed on the surface of the CeO2 crystallites, and to a lesser extent present as Cu2O."],["dc.identifier.doi","10.1007/s11051-016-3640-6"],["dc.identifier.isi","000390063800003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38948"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1572-896X"],["dc.relation.issn","1388-0764"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Cu-CeO2 nanocomposites: mechanochemical synthesis, physico-chemical properties, CO-PROX activity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","748"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","physica status solidi (b)"],["dc.bibliographiccitation.lastpage","754"],["dc.bibliographiccitation.volume","252"],["dc.contributor.author","Boukhvalov, D. W."],["dc.contributor.author","Korotin, D. M."],["dc.contributor.author","Efremov, A. V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Zhidkov, Ivan S."],["dc.contributor.author","Gunderov, D. V."],["dc.contributor.author","Valiev, R. Z."],["dc.contributor.author","Gavrilov, N. V."],["dc.contributor.author","Cholakh, Seif O."],["dc.date.accessioned","2018-11-07T09:59:02Z"],["dc.date.available","2018-11-07T09:59:02Z"],["dc.date.issued","2015"],["dc.description.abstract","The results of XPS measurements (core levels and valence bands) of P+, Ca+, P+Ca+ and Ca+P+ ion implanted (E = 30 keV, D = 1 x 10(17) cm(-2)) commercially pure titanium (cp-Ti) and first-principles density functional theory (DFT) calculations demonstrates formation of various structural defects in titanium dioxide films formed on the surface of implanted materials. We have found that for double implantation (Ti:P+, Ca+ and Ti:Ca+, P+) the outermost surface layer is formed mainly by Ca and P, respectively, i.e. the implantation sequence is very important. The DFT calculations show that under P+ and Ca+P+ ion implantation the formation energies for both cation (P-Ti) and anion (P-O) substitutions are comparable, which can induce the creation of [PO4](3-) and Ti-P species. For Ca+ and P+Ca+ ion implantation the calculated formation energies correspond to Ca2+-Ti4+ cation substitution. This conclusion is in agreement with XPS Ca 2p and Ti 2p core levels and valence-band measurements and DFT calculations of the electronic structure of related compounds. The conversion of implanted ions to Ca2+ and [PO4](3-) species provides a good biocompatibility of cp-Ti for further formation of hydroxyapatite. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim"],["dc.description.sponsorship","Russian Scientific Foundation [14-22-00004]"],["dc.identifier.doi","10.1002/pssb.201451362"],["dc.identifier.isi","000352643900015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37497"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1521-3951"],["dc.relation.issn","0370-1972"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Modification of titanium and titanium dioxide surfaces by ion implantation: Combined XPS and DFT study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5869"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","The Journal of Physical Chemistry. C, Nanomaterials and interfaces"],["dc.bibliographiccitation.lastpage","5879"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Leonov, Alexander V."],["dc.contributor.author","Postnikov, A. V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Moewes, A."],["dc.contributor.author","Pundt, A."],["dc.date.accessioned","2018-11-07T11:16:03Z"],["dc.date.available","2018-11-07T11:16:03Z"],["dc.date.issued","2008"],["dc.description.abstract","The effect of h-BN additive on hydrogen sorption by Ti under mechanical treatment in H-2/He flow and on the thermal stability of Ti-hydride produced during milling were studied using kinetic, structural, microscopic, and spectroscopic techniques and theoretical first-principles calculations. The results obtained were compared with the corresponding properties of pure Ti and Ti with graphite additive. Like graphite, hexagonal BN was found to be an effective additive to improve the hydrogen sorption capacity of Ti. New types of occupation sites available for hydrogen, very similar to those detected for Ti/C, were observed. These sites are characterized by a low H-2 desorption temperature: 630-670 K instead of similar to 1000 K."],["dc.identifier.doi","10.1021/jp077582s"],["dc.identifier.isi","000254883100029"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54505"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1932-7447"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Effect of h-BN additive on hydrogen sorption by Ti under mechanical treatment in H-2/He flow"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1812"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Journal of Biomedical Materials Research Part B Applied Biomaterials"],["dc.bibliographiccitation.lastpage","1816"],["dc.bibliographiccitation.volume","100B"],["dc.contributor.author","Korotin, D. M."],["dc.contributor.author","Bartkowski, S. B."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Mueller, M."],["dc.contributor.author","Neumann, M."],["dc.contributor.author","Gunderov, D. V."],["dc.contributor.author","Valiev, R. Z."],["dc.contributor.author","Cholakh, Seif O."],["dc.date.accessioned","2018-11-07T09:05:33Z"],["dc.date.available","2018-11-07T09:05:33Z"],["dc.date.issued","2012"],["dc.description.abstract","XPS measurements of coarse-grained and nanostructured nitinol (Ni50.2Ti49.8) before and after chemical treatment in hydrofluoric acid (40% HF, 1 min) are presented. The nanostructured state, providing the excellent mechanical properties of nitinol, is achieved by severe plastic deformation. The near-surface layers of nitinol were studied by XPS depth profiling. According to the obtained results, a chemical treatment in hydrofluoric acid reduces the thickness of the protective TiO2 oxide layer and induces a nickel release from the nitinol surface and an arsenic contamination, and can therefore not be recommended as conditioning to increase the roughness of NiTi-implants. A detailed evaluation of the resulting toxicological risks is given. (C) 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2012."],["dc.identifier.doi","10.1002/jbm.b.32748"],["dc.identifier.isi","000308403200011"],["dc.identifier.pmid","22807469"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25350"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1552-4981"],["dc.relation.issn","1552-4973"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Arsenic contamination of coarse-grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","757"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Current Nanoscience"],["dc.bibliographiccitation.lastpage","769"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Leonov, Alexander V."],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Cizek, Jakub"],["dc.contributor.author","Prochazka, Ivan"],["dc.contributor.author","Shkvarin, A. S."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Moewes, A."],["dc.date.accessioned","2018-11-07T08:50:49Z"],["dc.date.available","2018-11-07T08:50:49Z"],["dc.date.issued","2011"],["dc.description.abstract","Morphological, structural and chemical evolution in Ti/B/H-2 system is studied in detail as a function of mechanical treatment. Ti/B powder continuously changes both in composition and morphology during ball-milling in H-2 flow: The powder composition varies from Ti/B to TiH2-x/B causing a change in mechanical properties. The role of boron additive also changes from preventing the Ti nanoparticles from sticking together in the early stages to a matrix material participating in Ti - B interface reactions in the intermediate and final stages of the process. Boron atoms participating in the formation of nanoscopic holes give rise to new H states in the hydride by changing the local atomic state of Ti atoms. The dynamics of the formation of these sites and the redistribution of hydrogen between different types of occupation sites in dependence of phase composition and milling time of the powders are also studied."],["dc.identifier.doi","10.2174/157341311797483817"],["dc.identifier.isi","000299678400013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21779"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1573-4137"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Boron Enhanced Synthesis of Ti-hydride Nanoparticles by Milling Ti/B in Hydrogen Flow"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","196"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Journal of Physical Chemistry B"],["dc.bibliographiccitation.lastpage","204"],["dc.bibliographiccitation.volume","110"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Galakhov, A. V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","McNaughton, J."],["dc.contributor.author","Yabloskikh, M. V."],["dc.contributor.author","Moewes, A."],["dc.date.accessioned","2018-11-07T10:26:46Z"],["dc.date.available","2018-11-07T10:26:46Z"],["dc.date.issued","2006"],["dc.description.abstract","The effect of graphite addition on the mechanism of hydrogen uptake by titanium during mechanochemical activation in hydrogen flow was studied using kinetic, structural, microscopic, and spectroscopic techniques. As was found, already a small graphite admixture of about 0.5 wt % changed the kinetics of mechanically induced H-2 sorption and significantly stimulated Ti-H-2 interaction. Two new types of occupation sites available for hydrogen were observed, which are characterized by low H-2 desorption temperatures: about 650 and 750 K instead of 1000 K."],["dc.identifier.doi","10.1021/jp054505t"],["dc.identifier.isi","000234520700038"],["dc.identifier.pmid","16471521"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43113"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1520-6106"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Influence of graphite addition on the reactivity of Ti powder with H-2 under ball milling"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","82"],["dc.bibliographiccitation.issue","1-3"],["dc.bibliographiccitation.journal","Chemical Physics Letters"],["dc.bibliographiccitation.lastpage","85"],["dc.bibliographiccitation.volume","465"],["dc.contributor.author","Borchers, Christine"],["dc.contributor.author","Morozova, Olga S."],["dc.contributor.author","Khomenko, T. I."],["dc.contributor.author","Leonov, Alexander V."],["dc.contributor.author","Kurmaev, Ernst Z."],["dc.contributor.author","Moewes, A."],["dc.contributor.author","Pundt, Astrid"],["dc.date.accessioned","2018-11-07T11:09:14Z"],["dc.date.available","2018-11-07T11:09:14Z"],["dc.date.issued","2008"],["dc.description.abstract","The effect of graphite and BN on hydrogen absorption by Ti under milling in H-2/He flow and on the thermal stability of Ti-hydride produced during milling is compared. BN is the more effective additive than graphite to improve hydrogen sorption capacity of Ti because of the stimulation of a higher hydrogen uptake. Both additives stimulate the formation of occupation sites characterized by a H-2 desorption temperature that is up to 400 K lower than that of pure Ti. The reasons for the higher performance of hexagonal BN as compared to graphite are found to be entropic in nature. (c) 2008 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.cplett.2008.09.054"],["dc.identifier.isi","000260259100017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52962"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0009-2614"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Ti/C and Ti/h-BN nanocomposites: Comparison of hydrogen sorption/desorption properties"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]