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Dr. rer. nat. Alexandra Wittmar

Fakultät für Chemie

Room
S07 S01 C38
Phone
+49 201 183 6159

Functions

  • Wissenschaftliche/r Mitarbeiter/in, Prof. Ulbricht

The following publications are listed in the online university bibliography of the University of Duisburg-Essen. Further information may also be found on the person's personal web pages.

    Journal articles

  • Gao, Zhuo; Sanjuán, Ignacio; Hagemann, Ulrich; Wittmar, Alexandra S. M.; Andronescu, Corina; Ulbricht, Mathias
    Polyacrylonitrile-based porous polymer spheres and their conversion to N-doped carbon materials for adsorption and electrocatalysis
    In: Journal of Applied Polymer Science Vol. 141 (2024) Nr. 22, e55438
    Online Full Text: dx.doi.org/ (Open Access)
  • Wittmar, Alexandra; Vigneswaran, Thaarmikaa; Ranković, Nikola; Hagemann, Ulrich; Hartmann, Nils; Martínez-Hincapié, Ricardo; Čolić, Viktor; Ulbricht, Mathias
    N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H₂O₂ generation
    In: RSC Advances Vol. 13 (2023) Nr. 33, pp. 22777 - 22788
    Online Full Text: dx.doi.org/ (Open Access)
  • Wittmar, Alexandra S. M.; Ropertz, Marcus; Braun, Michael; Hagemann, Ulrich; Andronescu, Corina; Ulbricht, Mathias
    Preparation of N-doped carbon materials from cellulose:chitosan blends and their potential application in electrocatalytic oxygen reduction
    In: Polymer Bulletin Vol. 80 (2023) Nr. 7, pp. 7827 - 7845
    Online Full Text: dx.doi.org/ (Open Access)
  • Wittmar, Alexandra; Baumert, Daniel; Ulbricht, Mathias
    Cotton as Precursor for the Preparation of Porous Cellulose Adsorbers
    In: Macromolecular Materials and Engineering Vol. 306 (2021) Nr. 5, pp. 2000778
    Online Full Text: dx.doi.org/ (Open Access)
  • Madauß, Lukas; Pollmann, Erik; Foller, Tobias; Schumacher, Jens; Hagemann, Ulrich; Heckhoff, Tobias; Herder, Matthias; Skopinski, Lucia; Breuer, Lars; Hierzenberger, Anke; Wittmar, Alexandra; Lebius, Henning; Benyagoub, Abdenacer; Ulbricht, Mathias; Joshi, Rakesh; Schleberger, Marika
    A swift technique to hydrophobize graphene and increase its mechanical stability and charge carrier density
    In: npj 2D Materials and Applications Vol. 4 (2020) Nr. 1, 11
    Online Full Text: dx.doi.org/ (Open Access)
  • Wittmar, Alexandra; Klug, Jonathan; Ulbricht, Mathias
    Cellulose/chitosan porous spheres prepared from 1-butyl-3-methylimidazolium acetate/dimethylformamide solutions for Cu²⁺ adsorption
    In: Carbohydrate Polymers Vol. 237 (2020) 116135
    Online Full Text: dx.doi.org/
  • Surmeneva, Maria A.; Chudinova, Ekaterina A.; Chernozem, Roman V.; Lapanje, Ales; Koptyug, Andrey V.; Rijavec, Tomaž; Loza, Kateryna; Prymak, Oleg; Epple, Matthias; Wittmar, Alexandra; Ulbricht, Mathias; Surmenev, Roman A.
    Development of a bone substitute material based on additive manufactured Ti6Al4V alloys modified with bioceramic calcium carbonate coating : Characterization and antimicrobial properties
    In: Ceramics International Vol. 46 (2020) Nr. 16, Part A, pp. 25661 - 25670
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Koch, Dereck; Prymak, Oleg; Ulbricht, Mathias
    Factors Affecting the Nonsolvent-Induced Phase Separation of Cellulose from Ionic Liquid-Based Solutions
    In: ACS Omega Vol. 5 (2020) Nr. 42, pp. 27314 - 27322
    Online Full Text: dx.doi.org/ Online Full Text (Open Access)
  • Wittmar, Alexandra; Böhler, Hendrik; Kayali, Ahmad L.; Ulbricht, Mathias
    One-step preparation of porous cellulose/chitosan macro-spheres from ionic liquid-based solutions
    In: Cellulose Vol. 27 (2020) pp. 5689 - 5705
    Online Full Text: dx.doi.org/
  • Chudinova, Ekaterina A.; Surmeneva, Maria A.; Timin, Alexander S.; Karpov, Timofey E.; Wittmar, Alexandra; Ulbricht, Mathias; Ivanova, Anna; Loza, Kateryna; Prymak, Oleg; Koptyug, Andrey; Epple, Matthias; Surmenev, Roman A.
    Adhesion, proliferation, and osteogenic differentiation of human mesenchymal stem cells on additively manufactured Ti6Al4V alloy scaffolds modified with calcium phosphate nanoparticles
    In: Colloids and Surfaces B: Biointerfaces Vol. 176 (2019) pp. 130 - 139
    Online Full Text: dx.doi.org/
  • Chernozem, Roman V.; Surmeneva, Maria A.; Krause, Bärbel; Baumbach, Tilo; Ignatov, Viktor P.; Prymak, Oleg; Loza, Kateryna; Epple, Matthias; Ennen-Roth, Franka; Wittmar, Alexandra; Ulbricht, Mathias; Chudinova, Ekaterina A.; Rijavec, Tomaž; Lapanje, Aleš; Surmenev, Roman A.
    Functionalization of titania nanotubes with electrophoretically deposited silver and calcium phosphate nanoparticles : Structure, composition and antibacterial assay
    In: Materials Science and Engineering C: Biomimetic and Supramolecular Systems Vol. 97 (2019) pp. 420 - 430
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Fu, Qian; Ulbricht, Mathias
    Photocatalytic and magnetic porous cellulose macrospheres for water purification
    In: Cellulose Vol. 26 (2019) Nr. 7, pp. 4563 - 4578
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Ulbricht, Mathias
    Ionic Liquid-Based Route for the Preparation of Catalytically Active Cellulose-TiO
    In: Industrial and Engineering Chemistry Research (I&EC research) Vol. 56 (2017) Nr. 11, pp. 2967 - 2975
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Fu, Qian; Ulbricht, Mathias
    Photocatalytic and Magnetic Porous Cellulose-Based Nanocomposite Films Prepared by a Green Method
    In: ACS Sustainable Chemistry & Engineering Vol. 5 (2017) Nr. 11, pp. 9858 - 9868
    Online Full Text: dx.doi.org/
  • Gorodzha, S.N.; Surmeneva, M.A.; Koval, N.; Teresov, A.; Epple, Matthias; Ulbricht, Mathias; Wittmar, Alexandra; Prymak, Oleg; Surmenev, R.A.
    Correlation between surface properties and wettability of multi-scale structured biocompatible surfaces
    In: IOP Conference Series: Materials Science and Engineering Vol. 98 (2015) pp. 012026
    Online Full Text: dx.doi.org/ (Open Access)
  • Surmeneva, Maria A.; Kleinhans, Claudia; Vacun, Gabriele; Kluger, Petra Juliane; Schönhaar, Veronika; Müller, Michael; Hein, Sebastian Boris; Wittmar, Alexandra; Ulbricht, Mathias; Prymak, Oleg; Oehr, Christian; Surmenev, Roman A.
    Nano-hydroxyapatite-coated metal-ceramic composite of iron-tricalcium phosphate : Improving the surface wettability, adhesion and proliferation of mesenchymal stem cells in vitro
    In: Colloids and Surfaces B: Biointerfaces Vol. 135 (2015) pp. 386 - 393
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Thierfeld, Hanna; Köcher, Steffen; Ulbricht, Mathias
    Routes towards catalytically active TiO2 doped porous cellulose
    In: RSC Advances Vol. 5 (2015) Nr. 45, pp. 35866 - 35873
    Online Full Text: dx.doi.org/ (Open Access)
  • Wittmar, Alexandra; Vorat, Dimitri; Ulbricht, Mathias
    Two step and one step preparation of porous nanocomposite cellulose membranes doped with TiO2
    In: RSC Advances Vol. 5 (2015) Nr. 107, pp. 88070 - 88078
    Online Full Text: dx.doi.org/ (Open Access)
  • Gorodzha, S. N.; Surmeneva, M.A.; Surmenev, R.A.; Gribennikov, M.V.; Pichugin, V.F.; Sharonova, A.A.; Pustovalova, A.A.; Prymak, Oleg; Epple, Matthias; Wittmar, Alexandra; Ulbricht, Mathias; Gogolinskii, K.V.; Kravchuk, K.S.
    Erratum to: Wettability of Thin Silicate-Containing Hydroxyapatite Films formed by RF-Magnetron Sputtering
    In: Russian Physics Journal Vol. 56 (2014) Nr. 11, pp. 1318
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Gautam, Devendraprakash; Schilling, Carolin; Dörfler, Udo; Mayer-Zaika, Wolfgang; Winterer, Markus; Ulbricht, Mathias
    Stable zinc oxide nanoparticle dispersions in ionic liquids
    In: Journal of Nanoparticle Research Vol. 16 (2014) pp. 2341
    Online Full Text: dx.doi.org/
  • Gorodzha, S.N.; Surmeneva, M.A.; Surmenev, R.A.; Gribennikov, M.V.; Pichugin, V.F.; Sharonova, A.A.; Pustovalova, A.A.; Prymak, Oleg; Epple, Matthias; Wittmar, Alexandra; Ulbricht, Mathias; Gogolinskii, K.V.; Kravchuk, K.S.
    Wettability of Thin Silicate-Containing Hydroxyapatite Films Formed by RF-Magnetron Sputtering
    In: Russian Physics Journal Vol. 56 (2014) Nr. 10, pp. 1163 - 1169
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Gajda, Martyna; Gautam, Devendraprakash; Dörfler, Udo; Winterer, Markus; Ulbricht, Mathias
    Influence of the cation alkyl chain length of imidazolium-based room temperature ionic liquids on the dispersibility of TiO2 nanopowders
    In: Journal of Nanoparticle Research Vol. 15 (2013) Nr. 3, pp. 1463
    Online Full Text: dx.doi.org/
  • Surmeneva, Maria A.; Kovtun, Anna; Peetsch, Alexander; Goroja, S. N.; Sharonova, Anna; Pichugin, Vladimir F.; Grubova, Irina Y.; Ivanova, Anna A.; Teresov, A. D.; Koval, N. N.; Buck, Volker; Wittmar, Alexandra; Ulbricht, Mathias; Prymak, Oleg; Epple, Matthias; Surmenev, R. A.
    Preparation of a silicate-containing hydroxyapatite-based coating by magnetron sputtering : structure and osteoblast-like MG63 cells in vitro study
    In: RSC Advances Vol. 3 (2013) Nr. 28, pp. 11240 - 11246
    Online Full Text: dx.doi.org/
  • Gorodzha, S.N.; Surmeneva, M.A.; Surmenev, R.A.; Gribennikov, M.V.; Pichugin, V.F.; Sharonova, A.A.; Pustovalova, A.A.; Prymak, Oleg; Epple, Matthias; Wittmar, Alexandra; Ulbricht, Mathias; Gogolinskii, K.V.; Kravchuk, K.S.
    Wettability of surface of silicate-containing hydroxyapatite-based coating prepared by rf-magnetron sputtering
    In: Izvestija vysšich učebnych zavedenij: Fizika Vol. 10 (2013) Nr. 10, pp. 54 - 59
    Online Full Text
  • Wittmar, Alexandra; Ruiz-Abad, David; Ulbricht, Mathias
    Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology
    In: Journal of Nanoparticle Research Vol. 14 (2012) Nr. 2, pp. 651
    Online Full Text: dx.doi.org/
  • Wittmar, Alexandra; Ulbricht, Mathias
    Dispersions of various titania nanoparticles in two different ionic liquids
    In: Industrial and Engineering Chemistry Research (I&EC research) Vol. 51 (2012) Nr. 25, pp. 8425 - 8433
    Online Full Text: dx.doi.org/

    • Abstracts

  • Wittmar, Alexandra
    Functional porous cellulose-based nanocomposites by phase separation from ionic liquid based solvents
    In: ACS National Meeting / American Chemical Society Vol. 256 (2018) pp. 599