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  1. Article ; Online: Determining the Gibbs Energy Contributions of Ion and Electron Transfer for Proton Insertion in ϵ-MnO

    Malaie, Keyvan / Scholz, Fritz / Schröder, Uwe / Wulff, Harm / Kahlert, Heike

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2022  Volume 23, Issue 24, Page(s) e202200364

    Abstract: Electrochemically active ϵ- ... ...

    Abstract Electrochemically active ϵ-MnO
    MeSH term(s) Manganese Compounds/chemistry ; Oxides/chemistry ; Protons ; Electrons ; Electrodes
    Chemical Substances Manganese Compounds ; Oxides ; Protons
    Language English
    Publishing date 2022-10-17
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2025223-7
    ISSN 1439-7641 ; 1439-4235
    ISSN (online) 1439-7641
    ISSN 1439-4235
    DOI 10.1002/cphc.202200364
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  2. Article: Seaweed and Dendritic Growth in Unsaturated Fatty Acid Monolayers.

    Gellert, Florian / Ahrens, Heiko / Wulff, Harm / Helm, Christiane A

    Membranes

    2022  Volume 12, Issue 7

    Abstract: The lateral movement in lipid membranes depends on their diffusion constant within the membrane. However, when the flux of the subphase is high, the convective flow beneath the membrane also influences lipid movement. Lipid monolayers of an unsaturated ... ...

    Abstract The lateral movement in lipid membranes depends on their diffusion constant within the membrane. However, when the flux of the subphase is high, the convective flow beneath the membrane also influences lipid movement. Lipid monolayers of an unsaturated fatty acid at the water-air interface serve as model membranes. The formation of domains in the liquid/condensed coexistence region is investigated. The dimension of the domains is fractal, and they grow with a constant growth velocity. Increasing the compression speed of the monolayer induces a transition from seaweed growth to dendritic growth. Seaweed domains have broad tips and wide and variable side branch spacing. In contrast, dendritic domains have a higher fractal dimension, narrower tips, and small, well-defined side branch spacing. Additionally, the growth velocity is markedly larger for dendritic than seaweed growth. The domains' growth velocity increases and the tip radius decreases with increasing supersaturation in the liquid/condensed coexistence region. Implications for membranes are discussed.
    Language English
    Publishing date 2022-07-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2614641-1
    ISSN 2077-0375
    ISSN 2077-0375
    DOI 10.3390/membranes12070698
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Surface Stoichiometry and Depth Profile of Ti

    Mukhopadhyay, Arun Kumar / Roy, Avishek / Bhattacharjee, Gourab / Das, Sadhan Chandra / Majumdar, Abhijit / Wulff, Harm / Hippler, Rainer

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 12

    Abstract: We report the surface stoichiometry of Tix-CuyNz thin film as a function of film depth. Films are deposited by high power impulse (HiPIMS) and DC magnetron sputtering (DCMS). The composition of Ti, Cu, and N in the deposited film is investigated by X-ray ...

    Abstract We report the surface stoichiometry of Tix-CuyNz thin film as a function of film depth. Films are deposited by high power impulse (HiPIMS) and DC magnetron sputtering (DCMS). The composition of Ti, Cu, and N in the deposited film is investigated by X-ray photoelectron spectroscopy (XPS). At a larger depth, the relative composition of Cu and Ti in the film is increased compared to the surface. The amount of adventitious carbon which is present on the film surface strongly decreases with film depth. Deposited films also contain a significant amount of oxygen whose origin is not fully clear. Grazing incidence X-ray diffraction (GIXD) shows a Cu3N phase on the surface, while transmission electron microscopy (TEM) indicates a polycrystalline structure and the presence of a Ti3CuN phase.
    Language English
    Publishing date 2021-06-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14123191
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  4. Article ; Online: Deposition of Zn-containing films using atmospheric pressure plasma jet

    Galmiz Oleksandr / Stupavska Monika / Wulff Harm / Kersten Holger / Brablec Antonin / Cernak Mirko

    Open Chemistry, Vol 13, Iss

    2014  Volume 1

    Keywords atmospheric pressure plasma jet ; film deposition ; zinc ; Chemistry ; QD1-999
    Language English
    Publishing date 2014-11-01T00:00:00Z
    Publisher De Gruyter
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Nonaqueous atomic layer deposition of aluminum phosphate.

    Knohl, Stefan / Roy, Amit K / Lungwitz, Ralf / Spange, Stefan / Mäder, Thomas / Nestler, Daisy J / Wielage, Bernhard / Schulze, Steffen / Hietschold, Michael / Wulff, Harm / Helm, Christiane A / Seidel, Falko / Zahn, Dietrich R T / Goedel, Werner A

    ACS applied materials & interfaces

    2013  Volume 5, Issue 13, Page(s) 6161–6167

    Abstract: Aluminum phosphate was deposited onto bundles of carbon fibers and flat glassy carbon substrates using atomic layer deposition by exposing them to alternating pulses of trimethylaluminum and triethylphosphate vapors. Energy dispersive X-ray spectroscopy ( ...

    Abstract Aluminum phosphate was deposited onto bundles of carbon fibers and flat glassy carbon substrates using atomic layer deposition by exposing them to alternating pulses of trimethylaluminum and triethylphosphate vapors. Energy dispersive X-ray spectroscopy (EDXS) and solid state nuclear magnetic resonance (SS-NMR) spectra confirmed that the coating comprises aluminum phosphate (orthophosphate as well as other stoichiometries). Scanning electron microscopic (SEM) images revealed that the coatings are uniform and conformal. After coating, the fibers are still separated from each other like the uncoated fibers. Thermogravimetric analysis (TGA) indicates an improvement of oxidation resistance of the coated fibers compared to uncoated fibers.
    Language English
    Publishing date 2013-07-10
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/am401092z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Nonaqueous Atomic Layer Deposition of Aluminum Phosphate

    Knohl, Stefan / Goedel Werner A / Helm Christiane A / Hietschold Michael / Lungwitz Ralf / Mäder Thomas / Nestler Daisy J / Roy Amit K / Schulze Steffen / Seidel Falko / Spange Stefan / Wielage Bernhard / Wulff Harm / Zahn Dietrich R. T

    ACS Applied Materials & Interfaces. 2013 July 10, v. 5, no. 13

    2013  

    Abstract: Aluminum phosphate was deposited onto bundles of carbon fibers and flat glassy carbon substrates using atomic layer deposition by exposing them to alternating pulses of trimethylaluminum and triethylphosphate vapors. Energy dispersive X-ray spectroscopy ( ...

    Abstract Aluminum phosphate was deposited onto bundles of carbon fibers and flat glassy carbon substrates using atomic layer deposition by exposing them to alternating pulses of trimethylaluminum and triethylphosphate vapors. Energy dispersive X-ray spectroscopy (EDXS) and solid state nuclear magnetic resonance (SS-NMR) spectra confirmed that the coating comprises aluminum phosphate (orthophosphate as well as other stoichiometries). Scanning electron microscopic (SEM) images revealed that the coatings are uniform and conformal. After coating, the fibers are still separated from each other like the uncoated fibers. Thermogravimetric analysis (TGA) indicates an improvement of oxidation resistance of the coated fibers compared to uncoated fibers.
    Keywords aluminum phosphate ; carbon ; carbon fibers ; coatings ; energy-dispersive X-ray analysis ; nuclear magnetic resonance spectroscopy ; orthophosphates ; oxidation ; scanning electron microscopy ; thermogravimetry ; vapors
    Language English
    Dates of publication 2013-0710
    Size p. 6161-6167.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021%2Fam401092z
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Structure, insertion electrochemistry, and magnetic properties of a new type of substitutional solid solutions of copper, nickel, and iron hexacyanoferrates/hexacyanocobaltates.

    Widmann, Antje / Kahlert, Heike / Petrovic-Prelevic, Irena / Wulff, Harm / Yakhmi, J V / Bagkar, Nitin / Scholz, Fritz

    Inorganic chemistry

    2002  Volume 41, Issue 22, Page(s) 5706–5715

    Abstract: Substitutional solid solutions of metal hexacyanometalates in which low-spin iron(III) and cobalt(III) ions populate the carbon-coordinated sites were synthesized and studied by powder diffraction including Rietveld refinement, cyclic voltammetry of ... ...

    Abstract Substitutional solid solutions of metal hexacyanometalates in which low-spin iron(III) and cobalt(III) ions populate the carbon-coordinated sites were synthesized and studied by powder diffraction including Rietveld refinement, cyclic voltammetry of immobilized microparticles, diffuse reflection vis-spectrometry, and magnetization techniques. The continuous solid solution series of potassium copper(II), potassium nickel(II), and iron(III) [(hexacyanoferrate(III))(1-x)(hexacyanocobaltate(III))(x)] show that the substitution of low-spin iron(III) by cobalt(III) in the hexacyanometalate units more strongly affects the formal potentials of the nitrogen-coordinated copper(II) and high-spin iron(III) ions than those of the remaining low-spin iron(III) ions. In the case of copper(II) and iron(III) [(hexacyanoferrate(III))(1-x)(hexacyanocobaltate(III))(x)] the peak currents decrease much more than can be explained by stoichiometry, indicating that the charge propagation is slowed by the substitution of low-spin iron(III) by cobalt(III). The Rietveld refinement of all compounds confirmed the structure initially proposed by Keggin for Prussian blue and contradicts the structure described later by Ludi. The dependencies of lattice parameters on composition exhibit in all series of solid solutions studied similar, although small, deviations from ideality, which correlate with the electrochemical behavior. Finally, a series of solid solutions of the composition KNi(0.5)(II)Cu(0.5)(II)[Fe(III)(CN)(6)](1-x)[Co(III)(CN)(6)](x), where both the nitrogen- and carbon-coordinated metal ions are mixed populated and were synthesized and characterized. These are the first examples of solid solutions of metal hexacyanometalates with four different metal ions, where both the nitrogen- and the carbon-coordinated sites possess a mixed population.
    Language English
    Publishing date 2002-11-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/ic0201654
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