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  • 1.
    Björck, M.
    et al.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Chacon-Carillo, C.
    Universite Paris, France.
    Andersson, G.
    Uppsala Universitet.
    The asymmetric interface structure of bcc Fe82Ni18/Co superlattices as revealed by neutron diffraction2007In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, no 7-8, 3619-3623 p.Article in journal (Refereed)
    Abstract [en]

    The interface structure of Fe82Ni18/Co (001) superlattices was studied by a combination of X-ray and neutron diffraction. The anal. revealed highly asym. interfaces with total interface widths of 10±1 ML (monolayers) for Fe82Ni18 on Co and a max. interface width of 1 ML for Co on Fe82Ni18. In addn., there was no detectable long range B2-type chem. order occurring in the interface region. These results are discussed in the context of previously measured magnetic moments of the same system.

  • 2.
    Brucas, R.
    et al.
    Uppsala Universitet.
    Haferman, Hartmut
    University of Hamburg, 20355 Hamburg, Germany.
    Katsnelson, Michail
    Radboud University, 6525 AJ Nijmegen, The Netherlands .
    Soroka, Inna
    Uppsala Universitet.
    Eriksson, Olle
    Department of Physics and Materials Science, Uppsala University.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Magnetization and domain structure of bcc Fe81Ni19/Co (001) superlattices2004In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 69, no 6, 064411/1-064411/11 p.Article in journal (Refereed)
    Abstract [en]

    Dense stripe domains were obsd. for a Fe81Ni19/Co superlattice grown on a MgO(100) single crystal substrate using dc magnetron sputtering. The stripe domain period exhibits irreversible changes with the magnetic field, as detd. by magnetic force microscopy. We present a simple theor. model for this system and calc. the magnetization and domain period as functions of the applied field by minimizing the total energy. For this purpose, an expression for the domain wall energy and wall width for arbitrary angles and one for the magnetostatic energy are derived. The model correctly predicts a decreasing domain period with the increasing applied field. At larger magnetic fields a transition to "chaotic" two-dimensional stripe patterns is obsd. and a qual. discussion of this phenomenon is given.

  • 3.
    Brucas, Rimantas
    et al.
    Uppsala University.
    Haferman, Hartmut
    University of Hamburg, 20355 Hamburg, Germany.
    Soroka, Inna
    Uppsala Universitet.
    Iusan, D.
    Uppsala Universitet.
    Sanyal, B.
    Uppsala Universitet.
    Katsnelson, M. I.
    Radboud University, 6525 AJ Nijmegen, The Netherlands .
    Eriksson, Olle
    Department of Physics and Materials Science, Uppsala University.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Magnetic anisotropy and evolution of ground-state domain structures in bcc. Fe81Ni19/Co(001) superlattices2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 2, 024421/1-024421/15 p.Article in journal (Refereed)
    Abstract [en]

    The magnetic anisotropy and evolution of striped magnetic domain structures in bcc. Fe81Ni19/Co(001) superlattices with the total thickness ranging from 85 to 1370 nm was studied by magneto-optical Kerr effect and magnetic force microscopy. At a thickness of ∌85 nm [25 bilayers (BL)] the domains appear as stripe domains, typical for perpendicular anisotropy films, with the weak cubic anisotropy of the in-plane magnetization component stabilizing the stripe direction. The magnetic domain period strongly depends on the thickness of the superlattice. As the thickness increases, the equil. magnetization orients at oblique angles with respect to the film plane and continuously varies with the thickness from in-plane to out-of-plane. The authors 1st apply a simple phenomenol. model which correctly predicts the transition from in-plane to out-of-plane magnetization as well as increasing domain period and satn. field with increasing BL no. The results indicate partial flux-closure domains at the film surface with the tilt angle continuously varying with the superlattice thickness. By solving a linearized Landau-Lifshitz equation together with Maxwell's equations in magnetostatic approxn. for samples consisting of up to 1000 individual layers, the authors calc. the spin-wave dispersion and det. the stability conditions for the satd. ferromagnetic state. The dependence of the satn. field on the no. of layers is inferred and agrees well with the expt. The uniaxial bulk anisotropy is attributed to distortions along the c axis and the results further show evidence for the presence of an easy-plane interface anisotropy in these samples. [on SciFinder(R)]

  • 4.
    Butorin, S. M.
    et al.
    Uppsala Universitet.
    Shuh, D. K.
    Uppsala Universitet.
    Kvashnina, K.
    Uppsala Universitet.
    Soroka, Inna L.
    Uppsala Universitet.
    Ollila, K.
    Uppsala Universitet.
    Roberts, K. E.
    Uppsala Universitet.
    Guo, J. -H
    Uppsala Universitet.
    Werme, L.
    Uppsala Universitet.
    Nordgren, J.
    Uppsala Universitet.
    Resonant inelastic soft X-ray scattering studies of U(VI) reduction on iron surfaces2004In: Materials Research Society Symposium Proceedings, ISSN 0272-9172, Vol. 807, no Scientific Basis for Nuclear Waste Management XXVII, 113-118 p.Article in journal (Refereed)
    Abstract [en]

    The authors report on the spectroscopic anal. of several samples relevant to the processes governing the behavior of oxidized U species in groundwater solns. under anoxic conditions. Both Fe samples with different times of exposure to the U(IV) soln. and Fe metal-soln. interfaces in the liq. cell ex-situ and in-situ, resp. Resonant inelastic soft x-ray scattering is sensitive to the chem. state of U. The measurements were performed at a no. of energies of the primary photon beam across the U 5d absorption edge. The results unambiguously indicate the redn. of U(VI) to U(IV) on the Fe surface. [on SciFinder(R)]

  • 5. Dispenza, Clelia
    et al.
    Grimaldi, Natascia
    Sabatino, Maria Antonietta
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Radiation-Engineered Functional Nanoparticles in Aqueous Systems2015In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, Vol. 15, no 5, 3445-3467 p.Article, review/survey (Refereed)
    Abstract [en]

    Controlled synthesis of nanoscalar and nanostructured materials enables the development of novel functional materials with fine-tuned optical, mechanical, electronic, magnetic, conductive and catalytic properties that are of use in numerous applications. These materials have also found their potential use in medicine as vehicles for drug delivery, in diagnostics or in combinations thereof. In principle, nanoparticles can be divided into two broad categories, organic and inorganic nanoparticles. For both types of nanoparticles there are numerous possible synthetic routes. Considering the large difference in nature of these materials and the elementary reactions involved in the synthetic routes, most manufacturing techniques are complex and only suitable for one type of particle. Interestingly, radiation chemistry, i.e., the use of ionizing radiation from radioisotopes and accelerators to induce nanomaterials or chemical changes in materials, has proven to be a versatile tool for controlled manufacturing of both organic and inorganic nanoparticles. The advantages of using radiation chemistry for this purpose are many, such as low energy consumption, minimal use of potentially harmful chemicals and simple production schemes. For medical applications one more advantage is that the material can be sterile as manufactured. Radiation-induced synthesis can be carried out in aqueous systems, which minimizes the use of organic solvents and the need for separation and purification of the final product. The radiation chemistry of water is well known, as are the various ways of fine-tuning the reactivity of the system towards a desired target by adding different solutes. This, in combination with the controllable and adjustable irradiation process parameters, makes the technique superior to most other chemical methods. In this review, we discuss the fundamentals of radiation chemistry and radiation-induced synthesis of nanoparticles in aqueous solutions. The impact of dose and dose rate as well as of controlled addition of various solutes on the final particle composition, size and size distribution are described in detail and discussed in terms of reaction mechanism and kinetics.

  • 6.
    Haferman, Hartmut
    et al.
    University of Hamburg.
    Brucas, Rimantas
    Uppsala University.
    Soroka, I. L.
    Uppsala Universitet.
    Katsnelson, M. I.
    Radboud University.
    Iusan, D.
    Uppsala Universitet.
    Sanyal, B.
    Uppsala Universitet.
    Eriksson, Olle
    Department of Physics and Materials Science, Uppsala University.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Competing anisotropies in bcc Fe81Ni19/Co(001) superlattices2009In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 7, 073102/1-073102/3 p.Article in journal (Refereed)
    Abstract [en]

    A magnetization reorientation transition has been obsd. in Fe81Ni19/Co(001) superlattices by means of magneto-optical Kerr effect and magnetic force microscopy measurements. The transition is driven by the variation of the interface d. First-principles calcns. are combined with a linear stability anal. of the Landau-Lifshitz equation to clarify the mechanism that drives the transition. We are able to identify it as being driven by competing interface in-plane and uniaxial bulk out-of-plane anisotropies. The origin of the bulk anisotropy is attributed to tetragonal distortions exptl. obsd. in these superlattices.

  • 7.
    Häggström, Lennart
    et al.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Kamali, Saeed.
    Uppsala Universitet.
    Thickness dependent crystallographic transition in Fe/Ni multilayers2010In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 217, 012112- p.Article in journal (Refereed)
    Abstract [en]

    The crystallog. transition between bcc- and fcc-structures has been studied in Fe/Ni multilayers with Moessbauer spectroscopy and X-ray diffraction. Layered structures have been confirmed and the structures depends both on individual layer thickness and the ratio of the constituents. Two sets of samples are made: the Fe layer thickness kept const. to 12 monolayer (ML) and 24ML, while the Ni layer thicknesses varied from 3 to 12ML. When the Ni layer is thin, the Fe/Ni multilayers have the bcc phase. When the thickness of Ni layer reaches 6ML and larger, a gradual transition to the fcc phase occurs. Moessbauer spectroscopy studies confirm the existence of a magnetic Fe bcc phase with in-plane magnetization in all samples, two magnetic fcc phases with fields of 28 T and 10 T and small amts. of nonmagnetic fcc phases in the thicker films. The obsd. behavior can be attributed to the existence of two types of interfaces which are not necessary overlapping each other: An elemental interface between Fe and Ni and a structural interface between fcc and bcc phases. [on SciFinder(R)]

  • 8.
    Korzhavyi, Pavel A.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Soroka, Inna
    Uppsala Universitet.
    Boman, Mats
    Uppsala Universitet.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Thermodynamics of stable and metastable Cu-O-H compounds2011Conference paper (Refereed)
    Abstract [en]

    We apply density functional perturbation theory together with experimental studies in order to investigate the structure and physical properties of possible stable and metastable copper(I) compounds with oxygen and hydrogen. Copper(I) hydride, CuH, is found to be a metastable phase which decomposes at ambient conditions and exhibiting a semiconducting gap in the electronic spectrum. The calculated structure and phonon spectra are found to be in good agreement with experimental data. The phonon spectra of a novel metastable phase, copper(I) hydroxide, are also determined.

  • 9.
    Korzhavyi, Pavel A.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.
    Isaev, Eyvaz I.
    Lilja, Christina
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Exploring monovalent copper compounds with oxygen and hydrogen2012In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 109, no 3, 686-689 p.Article in journal (Refereed)
    Abstract [en]

    New important applications of copper metal, e.g., in the areas of hydrogen production, fuel cell operation, and spent nuclear fuel disposal, require accurate knowledge of the physical and chemical properties of stable and metastable copper compounds. Among the copper(I) compounds with oxygen and hydrogen, cuprous oxide Cu(2)O is the only one stable and the best studied. Other such compounds are less known (CuH) or totally unknown (CuOH) due to their instability relative to the oxide. Here we combine quantum-mechanical calculations with experimental studies to search for possible compounds of monovalent copper. Cuprous hydride (CuH) and cuprous hydroxide (CuOH) are proved to exist in solid form. We establish the chemical and physical properties of these compounds, thereby filling the existing gaps in our understanding of hydrogen- and oxygen-related phenomena in Cu metal.

  • 10.
    Kvashnina, K. O.
    et al.
    Uppsala Universitet.
    Butorin, S. M.
    Uppsala Universitet.
    Modin, A.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Marcellini, M.
    Uppsala Universitet.
    Guo, J. -H
    SKB, Sweden.
    Werme, L.
    Uppsala Universitet.
    Nordgren, J.
    Uppsala Universitet.
    Changes in electronic structure of copper films in aqueous solutions2007In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 19, no 22, 226002/1-226002/13 p.Article in journal (Refereed)
    Abstract [en]

    The possibility of using x-ray absorption spectroscopy and resonant inelastic x-ray scattering to probe the Cu oxidn. state and changes in the electronic structure during interaction between copper and ground-water solns. was examd. Surface modifications induced by chem. reactions of oxidized 100 Å thick Cu films with Cl-, SO2-4 and HCO-3 ions in aq. solns. having various concns. were studied in-situ using liq. cells. Copper corrosion processes in ground water were monitored for ≀9 days. By comparing Cu 2p-3d, 4s transitions for a no. of ref. substances previously measured, changes in electronic structure of the Cu films were analyzed. The spectral shape at the Cu edge, chem. shift of the main line for Cu2+, and energy positions of the obsd. satellites served as a tool for monitoring the changes during the reaction. The pH and Cl- concn. in the solns. strongly affect the rate of the corrosion reaction. [on SciFinder(R)]

  • 11.
    Kvashnina, K. O.
    et al.
    Uppsala Universitet.
    Butorin, S. M.
    Uppsala Universitet.
    Modin, A.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Marcellini, M.
    Uppsala Universitet.
    Nordgren, J.
    Uppsala Universitet.
    Guo, J. -H
    SKB, Sweden.
    Werme, L.
    Uppsala Universitet.
    In-situ x-ray absorption study of copper films in ground water solutions2007In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 447, no 1-3, 54-57 p.Article in journal (Refereed)
    Abstract [en]

    Damage to copper by corrosion can be decreased by modifying the chem. of the copper surface environment. The surface modification of oxidized copper films induced by chem. reaction with Cl- and HCO3- ions in aq. solns. was monitored by in-situ x-ray absorption spectroscopy. The corrosion of copper can be significantly decreased by adding even a small amt. of sodium bicarbonate. The copper films corroded rapidly in chloride solns. of synthetic ground water, whereas the same soln. contg. 1.1 mM HCO-3 prevented or slowed down the corrosion processes. [on SciFinder(R)]

  • 12.
    Li, Yunguo
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Lousada, Claudio Miguel
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Bond Network Topology and Antiferroelectric Order in Cuprice CuOH2015In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 54, no 18, 8969-8977 p.Article in journal (Refereed)
    Abstract [en]

    Using density functional theory (DFT) and a graph theory based approach, we investigated the topology of bond network in CuOH(s) (cuprice) considering only symmetry-distinct structures. In parallel, we conducted the synthesis and X-ray diffraction characterization of the compound and used the combined theoretical-experimental effort to validate the lowest energy structure obtained with DFT. The ground-state structure of CuOH(s) consists of compact trilayers of CuOH connected to each other via hydrogen bonds, where the inner layer of each trilayer is composed entirely of Cu atoms. Each trilayer is a dense fabric made of two interlocked arrays of polymer [CuOH]<inf>n</inf> chains. This structure corresponds to an antiferroelectric configuration where the dipole moments of CuOH molecules belonging to adjacent arrays are antiparallel and are arranged in the same way as the water molecules in ice-VIII. It is shown that a collective electrostatic interaction is the main driving force for the cation ordering while the local atomic configuration is maintained. These findings and the possibility of synthesizing exfoliated two-dimensional cuprice are important for some technological applications.

  • 13.
    Li, Yunguo
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Lousada, Cláudio M.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Bonding Topology and Antiferroelectric Order in Cuprice, CuOHManuscript (preprint) (Other academic)
  • 14.
    Li, Yunguo
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Lousada, Cláudio M.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Cation Ordering in Cuprice, CuOH2015In: Proceedings of PTM 2015, 2015Conference paper (Other academic)
  • 15.
    Lousada, Claudio Miguel
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Yagodzinskyy, Y.
    Tarakina, N. V.
    Todoshchenko, O.
    Hänninen, H.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Gamma radiation induces hydrogen absorption by copper in water2016In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 24234Article in journal (Refereed)
    Abstract [en]

    One of the most intricate issues of nuclear power is the long-term safety of repositories for radioactive waste. These repositories can have an impact on future generations for a period of time orders of magnitude longer than any known civilization. Several countries have considered copper as an outer corrosion barrier for canisters containing spent nuclear fuel. Among the many processes that must be considered in the safety assessments, radiation induced processes constitute a key-component. Here we show that copper metal immersed in water uptakes considerable amounts of hydrogen when exposed to γ-radiation. Additionally we show that the amount of hydrogen absorbed by copper depends on the total dose of radiation. At a dose of 69 kGy the uptake of hydrogen by metallic copper is 7 orders of magnitude higher than when the absorption is driven by H2(g) at a pressure of 1 atm in a non-irradiated dry system. Moreover, irradiation of copper in water causes corrosion of the metal and the formation of a variety of surface cavities, nanoparticle deposits, and islands of needle-shaped crystals. Hence, radiation enhanced uptake of hydrogen by spent nuclear fuel encapsulating materials should be taken into account in the safety assessments of nuclear waste repositories.

  • 16.
    Lousada, Cláudio M.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Fernandes, Ricardo M. F.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Tarakina, Nadezda V.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Synthesis of copper hydride (CuH) from CuCO3·Cu(OH)2 – a path to electrically conductive thin films of Cu2017In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 46, no 20, 6533-6543 p.Article in journal (Refereed)
    Abstract [en]

    The most common synthesis methods for copper hydride (CuH) employ hard ligands that lead to the formation of considerable amounts of metallic Cu as side-product. Here we explore a synthesis method for CuH(s) through the reaction of CuCO3 center dot Cu(OH)(2)(s) with hypophosphorous acid (H3PO2) in solution, via the formation of the intermediate Cu(H2PO2)(2)(aq) complex. The reaction products were characterized with XRD, FTIR and SEM at different reaction times, and the kinetics of the transformation of Cu(H2PO2)(2)(aq) to CuH(s) were followed with NMR and are discussed. We show that our synthesis method provides a simple way for obtaining large amounts of CuH(s) even when the synthesis is performed in air. Compared to the classic Wurtz method, where CuSO4 is used as an initial source of Cu2+, our synthesis produces CuH particles with less metallic Cu side-product. We attribute this to the fact that our reaction medium is free from the hard SO42- ligand that can disproportionate Cu(I). We discuss a mechanism for the reaction based on the known reactivity of the reagents and intermediates involved. We explored the possibility of using CuH(s) for making electrically conductive films. Tests that employed water-dispersed CuH particles show that this compound can be reduced with H3PO2 leading to electrically conductive thin films of Cu. These films were made on regular office paper and were found to be Ohmic conductors even after several weeks of exposure to ambient conditions. The fact that the synthesis reported here produces large amounts of CuH particles in aqueous media, with very little impurities, and the fact that these can then be converted to a stable electrically conductive film can open up new applications for CuH such as for printing electrically conductive films or manufacturing surface coatings.

  • 17.
    Schuch, R.
    et al.
    Stockholm University.
    Johansson, A.
    Uppsala Universitet.
    Kumar, R. T. R.
    Stockholm Universitet.
    Sahana, M. B.
    Stockholm University.
    Skog, P.
    Stockholm Universitet.
    Soroka, Inna
    Atomic Physics, Fysikum, AlbaNova, Stockholm, Sweden.
    Vikor, Gy.
    Stockholm University.
    Zhang, H. Q.
    Stockholm University.
    Guiding of highly charged ions through insulating nanocapillaries2008In: Canadian journal of physics (Print), ISSN 0008-4204, E-ISSN 1208-6045, Vol. 86, no 1, 327-330 p.Article in journal (Refereed)
    Abstract [en]

    The guiding of highly charged ions through nanocapillaries in different insulating materials, such as polyethylene terephthalate, SiO2, and Al2O3 was investigated by our group, using 7 keV Ne7+ ions. We find transmission of ions incident at angles larger than the angle given by the capillary aspect ratio in all these materials. The measured angular distributions, however, vary with the membrane material. In this report we compare the exptl. findings with the different membranes. [on SciFinder(R)]

  • 18.
    Skog, P.
    et al.
    Stockholm Universitet.
    Soroka, Inna L.
    Stockholm Universitet.
    Johansson, A.
    Uppsala Universitet.
    Schuch, R.
    Stockholm Universitet.
    Guiding of highly charged ions through Al2O3 nano-capillaries2007In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, Vol. 258, no 1, 145-149 p.Article in journal (Refereed)
    Abstract [en]

    Over the past years, our group has performed expts. on ion guiding in nano-capillary membranes of polyethylene terephthalate (PET), SiO2 and Al2O3. We report the results from our recent expts. on guiding of 7 keV Ne7+-ions in Al2O3 nano-capillaries of about 1/200 aspect ratio. We will compare these exptl. findings with previously obtained and published results of different membrane materials. [on SciFinder(R)]

  • 19.
    Skog, P.
    et al.
    Stockholm Universitet.
    Zhang, H. Q.
    Stockholm University.
    Akram, N.
    Stockholm University.
    Soroka, Inna
    Uppsala Universitet.
    Trautmann, C.
    GSI Helmholtzzentrum fur Schwerionenforschung, Germany.
    Schuch, R.
    Stockholm University.
    Guiding of slow Ne7+-ions through insulating nano-capillaries of various geometrical cross-sections2009In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 194Article in journal (Refereed)
    Abstract [en]

    We have studied guiding of slow highly charged ions through PET, SiO2, Al2O3, and now, for the first time, insulating nano-capillaries of non-circular cross-section. The guiding effect is been explained by self-organized formation of charge patches on the inner capillary walls. We investigate the effects of the geometrical cross-section on the distribution of Ne7+-ions transmitted through nano-capillaries of rhombic cross-section in muscovite mica, using ion beams of different kinetic energies. [on SciFinder(R)]

  • 20.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Björck, M.
    Brucas, R.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Andersson, G.
    Element-specific magnetic moments in bcc Fe81Ni19/Co superlattices2005In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, no 13, 134409- p.Article in journal (Refereed)
    Abstract [en]

    The magnetic moments in bcc Fe81Ni19/Co(001) superlattices with the individual layer thickness of 2-6 monolayers were studied by means of soft x-ray magnetic circular dichroism. It was found that the magnetic moment was enhanced in the Fe81Ni19 layer by about 0.35 mu(B)/atom as compared to the bulk value, while the Co moment remained unaffected by the presence of interfaces. The extension of the region with the high Fe81Ni19 moment in our samples was found to be at least 3 monolayers from the interfaces. Possible sources of the Fe81Ni19 moment enhancement were considered in ab initio calculations, and it was concluded that the enhanced moment may be explained by intermixing and formation of a B2-type short-range order at the interfaces.

  • 21.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Brucas, Rimantas
    Uppsala University.
    Stanciu, V.
    Uppsala Universitet.
    Nordblad, P.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Enhanced magnetic moment at the interfaces in Fe81Ni19/Co superlattices2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 277, no 1-2, 228-235 p.Article in journal (Refereed)
    Abstract [en]

    The structure and magnetic properties of BCC (0 0 1) oriented Fe81Ni19/Co superlattices grown on MgO(0 0 1) substrates by magnetron sputtering are presented. The variation of magnetic moment with the compn. and with the interface d. was studied. A model in which the magnetic moment per atom at the interfaces is different from that in the interior region was used for the anal. The extension of the interface region is ∌3.5 monolayers and the magnetic moment in this region is enhanced by ∌0.3 ΌB/atom, compared to the interior regions. The superlattices form a BCC-like structure with a slight orthorhombic distortion, which gives rise to a weak in-plane uniaxial anisotropy. [on SciFinder(R)]

  • 22.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Origin of uniaxial in-plane magnetic anisotropy in Fe81Ni19/Co superlattices.2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 272, 1247-1248 p.Article in journal (Refereed)
    Abstract [en]

    The authors have studied the in-plane magnetic uniaxial anisotropy, for (0 0 1)-oriented Fe81Ni19/Co superlattices grown on MgO (0 0 1) by magnetron sputtering. The layers in the superlattices have a BCC structure with a slight orthorhombic distortion, which gives rise to a weak in-plane uniaxial anisotropy. [on SciFinder(R)]

  • 23.
    Soroka, Inna L.
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Shchukarev, Andrey
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Tarakina, Nadezda V.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Cuprous hydroxide in a solid form: does it exist?2013In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 42, no 26, 9585-9594 p.Article in journal (Refereed)
    Abstract [en]

    Experimental studies have been performed to obtain the unknown cuprous hydroxide compound, which has recently been predicted theoretically (P. A. Korzhavyi et. al., Proc. Natl. Acad. Sci. U. S. A., 2012, 109, 686-689) to be metastable in a solid form. The reduction of Cu2+ with ferrous ethylenediamine tetraacetate (EDTA) results in the formation of a yellow powder precipitate whose composition corresponds to CuOH x H2O as probed by Fourier Transform Infrared Spectroscopy (FTIR) and cryogenic X-ray Photoelectron Spectroscopy (XPS). A similar compound has been found on the surface of Cu-CuH powder stored in water, as detected by XPS. The reduction of Cu2+ to Cu+ with free radicals in aqueous solutions results in a Cu2O precipitate as the final product, while the formation of the yellow cuprous hydroxide colloids may be an intermediate step. Our studies reveal that cuprous hydroxide does exist in a solid form and most likely has a hydrated form, CuOH x H2O.

  • 24.
    Soroka, Inna L.
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Tarakina, Nadezda V.
    Korzhavyi, Pavel A.
    Stepanenko, Vladimir
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Effect of synthesis temperature on the morphology and stability of copper(I) hydride nanoparticles2013In: CrysteEngComm, ISSN 1466-8033, Vol. 15, no 42, 8450-8460 p.Article in journal (Refereed)
    Abstract [en]

    The effect of synthesis temperature on the morphology and stability of copper(I) hydride nanoparticles is studied. Monovalent copper hydride is obtained by reduction of Cu2+ sulfate with hypophosphorous acid at temperatures ranging from 45 degrees C to 75 degrees C. The CuH nanoparticles that formed have the shape of desert roses and are found to be very porous. The lattice parameter, size, and morphology of these nanoparticles depend on the synthesis temperature. CuH is a metastable compound. In air under ambient conditions, it first decomposes into copper metal and hydrogen gas and then the copper oxidizes. The copper particles that are left after the decomposition of copper(I) hydride in air have the same desert-rose morphology as the CuH nanoparticles. The copper particles with desert-rose shapes are observed for the first time. Copper(I) hydride decomposes slower in an aqueous environment than in air to form copper(I) oxide as the final product through formation of hydrated copper(I) hydroxide as an intermediate phase. The retarded decomposition of CuH in water may be explained by the formation of a protective CuOH center dot H2O layer on the surface of copper(I) hydride.

  • 25.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Rooth, M.
    Uppsala Universitet.
    Lu, J.
    Uppsala Universitet.
    Boman, M.
    Uppsala Universitet.
    Svedlindh, P.
    Uppsala Universitet.
    Carlsson, J. -O
    Uppsala Universitet.
    Hårsta, A.
    Uppsala Universitet.
    Template-based multiwalled TiO2/iron oxides nanotubes: Structure and magnetic properties2009In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 106, no 8, 084313/1-084313/7 p.Article in journal (Refereed)
    Abstract [en]

    Double- and triple-walled TiO2/Fe oxide nanotubes with well defined interfaces have been produced in nanoporous Al2O3 templates using at. layer deposition method. The structural properties of each individual layer are dependent on the deposition temps. The outer layers of TiO2 are polycryst. and consist of a phase mixt. of anatase and rutile, while the inner TiO2 layers grown at lower temp. are amorphous. The Fe oxide layers consist of pure hematite when deposited at 500°, while a phase mixt. of hematite and magnetite was obtained at 400°. The magnetization measurements reveal that the studied nanotubes exhibit weak ferromagnetic behavior and magnetic anisotropy with an easy axis perpendicular to the tube axis.

  • 26.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Stanciu, V.
    Uppsala Universitet.
    Lu, J.
    Uppsala Universitet.
    Nordblad, P.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Structural and magnetic properties of Al2O3/Ni81Fe19 thin films: From superparamagnetic nanoparticles to ferromagnetic multilayers2005In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 17, no 33, 5027-5036 p.Article in journal (Refereed)
    Abstract [en]

    Al2O3/Ni81Fe19 multilayer films were produced by sequential magnetron sputter deposition on thermally oxidized Si(001) substrates. By varying the thickness of the Ni81Fe19 layer from 8 to 30 Aa, while keeping the other parameters unchanged, one can control the film structure from nanoclusters to continuous multilayers. The nanoclustered sample is superparamagnetic while the continuous samples show ferromagnetic behavior. The magnetic moments per atom of the Ni81Fe19 layers decrease with decreasing amt. of metallic deposits, indicating the presence of nonmagnetic layers at the interfaces. The thicknesses of these layers are ∌1 Aa for the flat continuous film and 3.8 Aa for the nanoclustered film. The existence of nonmagnetic layers may be interpreted in terms of the formation of antiferromagnetic oxides at the interfaces. [on SciFinder(R)]

  • 27.
    Soroka, Inna
    et al.
    KTH, School of Chemical Science and Engineering (CHE).
    Tarakina, Nadezda V.
    Hermansson, Anton
    KTH, School of Chemical Science and Engineering (CHE).
    Bigum, Lukas
    KTH, School of Chemical Science and Engineering (CHE).
    Widerberg, Rickard
    KTH, School of Chemical Science and Engineering (CHE).
    Andersson, Mikael S.
    Mathieu, Roland
    Paulraj, Alagar R.
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Kiros, Yohannes
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology. KTH, Superseded Departments (pre-2005), Chemical Engineering and Technology. KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Reaction Engineering.
    Radiation-induced synthesis of nanoscale Co- and Ni-based electro-catalysts on carbon for the oxygen reduction reaction2017In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 46, no 30, 9995-10002 p.Article in journal (Refereed)
    Abstract [en]

    A facile synthesis of 3d-metal based electro-catalysts directly incorporated into a carbon support was carried out by.-radiation. Transition metals of period 4, i.e. Ni and Co, were precipitated and reduced from their respective salt solutions. The obtained materials were characterized by XRD, SEM, SQUID and the BET methods. Thereafter, the electrodes for fuel cells were fabricated out of synthesized material and their electrochemical performance for the oxygen reduction reaction in 6 M KOH was measured. Although the concentrations of Co and Ni in the electrode material were low (3.4% Co and 0.4% Ni) after reduction by irradiation, both the Ni and Co-based gas diffusion electrodes showed high catalytic activity for oxygen reduction both at room temperature and at 60 degrees C.

  • 28.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Vegelius, Johan
    Uppsala Univeritet.
    Korelis, Panagotis
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Butorin, Sergey
    Uppsala Universitet.
    Structural stability and oxidation resistance of amorphous Zr–Al alloys2010In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 401, no 1-3, 38-45 p.Article in journal (Refereed)
    Abstract [en]

    We investigated the structural stability and oxidation resistance of Zr-Al films upon annealing in air. The concentration of Zr was varied from 0 to 100 at.%, with a step of 10 at.%. The films were fabricated using ultra-high vacuum based magnetron sputtering. The as-deposited films with Zr content from 17.3 at.% to 70.7 at.% were found to be X-ray amorphous at room temperature. When exposed to air a thin oxide layer, typically less than 6 nm, is formed. The thickness of the oxide layers increases when the samples are annealed in air and most of these are found to be fully oxidized at 700 degrees C with the formation of crystalline and amorphous oxides on the top of crystalline and amorphous metal films, respectively. The amorphous oxide layers are found to be dense, with well defined thicknesses. An experimental non-equilibrium phase diagram is provided, covering the whole concentration range of the Zr-Al system.

  • 29.
    Stanciu, V.
    et al.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Lu, J.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Nordblad, P.
    Uppsala Universitet.
    Dynamic magnetic properties of Ni81Fe19/Al2O3 multilayers2005In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 286, no SI, 446-449 p.Article in journal (Refereed)
    Abstract [en]

    Discontinuous magnetic metal-insulator multilayers of Ni81Fe19 and Al2O3 were prepd. by sequential magnetron sputtering in an UHV chamber. Ni81Fe19 layers of nominal thickness 8 Å form clusters of quite uniform size having an av. diam. of ∌24 Å. A layered structure is maintained in the out-of-plane direction, but a random distribution of the metal clusters occurs in plane. These films have magnetic properties that vary strongly with the Al2O3 layer thickness-exhibiting ferromagnetic, spin glass like and superparamagnetic behavior as this layer thickness is increased from 10 via 19 to 31

  • 30.
    Van Kampen, M.
    et al.
    Uppsala Universitet.
    Soroka, Inna L.
    Uppsala Universitet.
    Brucas, Rimantas
    Uppsala University.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Wieser, R.
    Universitat Duisburg-Essen, Germany.
    Usadel, K. D.
    Universitat Duisburg-Essen, Germany.
    Hanson, M.
    Chalmers University of Technology.
    Kazakova, O.
    Chalmers University of Technology.
    Grabis, J.
    Ruhr-Universitat Bochum, Germany.
    Zabel, H.
    Ruhr-Universitat Bochum, Germany.
    Jozsa, C.
    Center for NanoMaterials and COBRA Research Institute, Eindhoven University of Technology, The Netherlands.
    Koopmans, B.
    Center for NanoMaterials and COBRA Research Institute, Eindhoven University of Technology, The Netherlands.
    On the realization of artificial XY spin chains2005In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 17, no 2, L27-L33 p.Article in journal (Refereed)
    Abstract [en]

    Spin chains are the most elementary entities in the study of magnetic ordering behavior. The authors describe a route toward the realization of artificial XY spin chains. Using thin-film deposition and e-beam lithog., 300 and 550 nm diam. pillars consisting of alternating disks of permalloy and Al2O3 were made. Shape anisotropy forces the magnetization in plane, creating a chain of two-dimensional magnetic moments →i. The disks couple to each other by their dipolar stray fields, resulting in an interaction Jij→i·→j, with Jij the coupling between disks i and j. This form closely resembles a chain of xy spins, coupled by effective interactions Jij. The authors present a magnetic characterization of the pillars, and compare the results with model calcns. Also, spin dynamics and ordering phenomena are addressed.

  • 31. Vegelius, J. R.
    et al.
    Kvashnina, K. O.
    Hollmark, H.
    Klintenberg, M.
    Kvashnin, Y. O.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Werme, L.
    Butorin, S. M.
    X-ray Spectroscopic Study of Cu2S, CuS, and Copper Films Exposed to Na2S Solutions2012In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 116, no 42, 22293-22300 p.Article in journal (Refereed)
    Abstract [en]

    The electronic structure of copper sulfides was studied using X-ray absorption at Cu K and L-2,L-3 and S L-2,L-3 edges and X-ray emission spectroscopy at S L-2,L-3 thresholds. The experimental data were compared with results of local density approximation calculations taking into account the calculated valence band contributions and core-level chemical shifts between inequivalent sites. The presence of divalent Cu was detected in CuS with X-ray absorption spectroscopy in the high-energy-resolution fluorescence detection (HERFD) mode. The S L-2,L-3 emission spectrum of CuS was found to be significantly broader than that of Cu2S due to contributions from inequivalent S sites. This difference in the spectral width was used to distinguish between sulfide species formed on the Cu foil exposed to Na2S solutions. The Cu-S interaction processes for Cu films of different thicknesses exposed to Na2S solutions were monitored in situ using X-ray absorption spectroscopy in the HERFD mode at the Cu K edge. It was found that Cu ions were diffusing in the sulfide and entering the solution. The rate at which Cu ions enter the solution via diffusion was estimated on the basis of the results for a 1000 angstrom thick film.

  • 32. Vegelius, J. R.
    et al.
    Kvashnina, K. O.
    Klintenberg, M.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Butorin, S. M.
    Cu K beta(2,5) X-ray emission spectroscopy as a tool for characterization of monovalent copper compounds2012In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 27, no 11, 1882-1888 p.Article in journal (Refereed)
    Abstract [en]

    Cu Kβ 2,5 X-ray emission and resonant inelastic X-ray scattering measurements were performed on monovalent and divalent copper compounds. The data were compared with the results of local-density- approximation calculations. The methods were found to be efficient tools for studies of Cu 4p states in the valence band and for distinguishing between different monovalent copper compounds. This is of particular importance for the debate concerning copper corrosion in oxygen-free water.

  • 33.
    Vegelius, J.
    et al.
    Uppsala Universitet.
    Soroka, Inna L.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry (closed 20110630).
    Korelis, P. T.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Butorin, S. M.
    Uppsala Universitet.
    Atomic and electronic structure of amorphous Al-Zr alloy films2011In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 23, no 26, 265503- p.Article in journal (Refereed)
    Abstract [en]

    Amorphous Al73Zr27 alloy film, grown and then subjected to heat treatments at 400 and 700 degrees C, was studied using a combination of x-ray diffraction and soft x-ray spectroscopic techniques. The Al L-2,L-3 and Al K x-ray absorption spectroscopy (XAS) and Al L-2,L-3 x-ray emission spectroscopy (XES) used allowed probing the unoccupied and occupied Al 3s, d states and unoccupied Al 3p states in the sample studied. An irreversible transition from amorphous alloy to a mixture of polycrystalline alloy and amorphous alloy, and then to an amorphous oxide phase was observed. After the annealing at 400 degrees C the Al L-2,L-3 spectra obtained by XAS could be explained as sums of spectra from amorphous Al73Zr27 alloy and (poly) crystalline Al. This indicates that the sample consists of a mixture of Al-rich crystalline and Zr-enhanced amorphous alloys, as compared to the stoichiometry of the as-deposited Al73Zr27 sample, and that the electronic wavefunctions in the crystalline and amorphous regions can be considered to be confined within the respective regions. The relative amounts of Al atoms were found to be around 1: 3 in the crystalline and amorphous phases, respectively, as deduced from the analysis of changes in the electronic structure using Al L-2,L-3 XAS data. The interpretation was confirmed by the Al K XAS and Al L-2,L-3 XES. Upon further annealing at 700 degrees C the polycrystalline phase transformed into amorphous oxide, while the amorphous alloy phase underwent gradual oxidation. The important finding was that the greater part of the sample remained in the amorphous state throughout the temperature regimes described.

  • 34.
    Yang, Miao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. Wuhan University of Technology, China.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Exploring the limitations of the Hantzsch method used for quantification of hydroxyl radicals in systems of relevance for interfacial radiation chemistry2017In: Radiation Physics and Chemistry, ISSN 0969-806X, E-ISSN 1879-0895, Vol. 130, 1-4 p.Article in journal (Refereed)
    Abstract [en]

    In the presence of Tris or methanol, hydroxyl radicals in systems of relevance for interfacial radiation chemistry can be quantified indirectly via the Hantzsch method by determining the amount of the scavenging product formaldehyde formed. In this work, the influence of the presence of H2O2 on the Hantzsch method using acetoacetanilide (AAA) as derivatization reagent is studied. The experiments show that the measured CH2O concentration deviates from the actual concentration in the presence of H2O2 and the deviation increases with increasing [H2O2]0/[CH2O]0. The deviation is negative, i.e., the measured formaldehyde concentration is lower than the actual concentration. This leads to an underestimation of the hydroxyl radical production in systems containing significant amount of H2O2. The main reason for the deviation is found to be three coupled equilibria involving H2O2, CH2O and the derivative produced in the Hantzsch method.

  • 35.
    Yang, Miao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Hydroxyl radical production in aerobic aqueous solution containing metallic tungsten2015In: Catalysis communications, ISSN 1566-7367, E-ISSN 1873-3905, Vol. 71, 93-96 p.Article in journal (Refereed)
    Abstract [en]

    Abstract In this work, we investigate the production of hydroxyl radicals from the W(s)/air aqueous system by quantifying the amount of scavenging product formaldehyde via the modified Hantzsch method. Tris(hydroxymethyl) aminomethane (Tris) and methanol are used as probe for HO. Meanwhile, the amount of dissolved tungsten is determined by ICP-OES. A turnover point ([W] ≈ 200 μM) is observed in the Tris case after which the production rate of CH2O overwhelms the constant rate in the methanol case. Based on the results, a mechanism is proposed for the studied system including both surface and solution reactions.

  • 36.
    Yang, Miao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Hydroxyl Radical Production in Aerobic Aqueous Solution containing Metallic TungstenManuscript (preprint) (Other academic)
  • 37.
    Yang, Miao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Influence of H2O2 on the Quantitative Determination of Formaldehyde using Acetoacetanilide as Detection Reagent in the Hantzsch MethodManuscript (preprint) (Other academic)
  • 38.
    Yang, Miao
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Zhang, Xian
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    Grosjean, Alex
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Jonsson, Mats
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Kinetics and Mechanism of the Reaction between H2O2 and Tungsten Powder in Water2015In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 39, 22560-22569 p.Article in journal (Refereed)
    Abstract [en]

    In this work, the reaction between H2O2 and tungsten powder in the presence of Tris(hydroxymethyl) aminomethane was studied experimentally. The production of hydroxyl radicals can be quantified indirectly by quantifying the scavenging product formaldehyde (CH2O). XRD, XPS, and SEM analysis shows that no significant structural or compositional changes occur after reaction. We compared H2O2 consumption and CH2O formation in both heterogeneous W(s)/H2O2/Tris system and homogeneous W(aq)/H2O2/Tris system. Increasing the amount of W powder leads to the increase in dissolution rate of W species, insignificant increase of H2O2 consumption rate and the decrease of final CH2O production. By contrast, the consumption rate of H2O2 increases as increasing the concentration of dissolved W species. Based on the experimental results, a mechanism of H2O2 reacting with W powder in the presence of Tris is proposed. The mechanism well explained the relationship between surface reactions and homogeneous Haber–Weiss peroxide chain breakdown.

  • 39. Zhang, H. -Q
    et al.
    Akram, N.
    Skog, P.
    Soroka, Inna
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Trautmann, C.
    Schuch, R.
    Tailoring of keV-ion beams by image charge when transmitting through rhombic and rectangular shaped nanocapillaries2012In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 19, 193202- p.Article in journal (Refereed)
    Abstract [en]

    We report on an unexpected effect of tailoring transmission profiles of Ne7 + ions through nanocapillaries of rhombic and rectangular cross sections in mica. We find that capillaries of rhombic cross sections produce rectangular shaped ion transmission profiles and, vice versa, that capillaries of rectangular geometry give a rhombic beam shape. This shaping effect only occurs for transmitted ions and is absent for the small fraction of neutralized particles. The experimental findings and simulations of the projectile trajectories give clear evidence that the observed effect is due to the image forces experienced by the transmitting ions. This novel beam shaping mechanism suggests applications for the guiding, focusing, and shaping of ion beams.

  • 40. Zhang, H. Q.
    et al.
    Akram, N.
    Soroka, Inna L.
    Physics Department, Stockholm University, Sweden.
    Trautmann, C.
    Schuch, R.
    Transmission of highly charged ions through mica nanocapillaries of rhombic cross section2012In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 86, no 2, 022901- p.Article in journal (Refereed)
    Abstract [en]

    The angular distributions of Ne7 + ions transmitted at various kinetic energies of 7-70 keV through muscovite mica nanocapillaries of rhombic cross section are measured. It is found that the transmitted ion beams form a rectangular shape at tilt angles that are small compared to those given by the aspect ratio, i.e., the capillary geometrical opening angle. This shape is retained for all ion energies, but its size changes. The time evolution of the transmitted angular distributions shows that the characteristic profile occurs instantaneously and remains in the stationary state of the transmission, whereas it shifts with the increase of the accumulated incident charge. At tilt angles of the capillaries larger than their aspect ratio, the shape in the transmission profile gets distorted from the rectangle by the deposited charge. Combined with trajectory simulations we show the observed shaping effect is due to the image force seen by the ions, interplaying with a deflection by the deposited charge on the capillary walls.

1 - 40 of 40
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