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Dr. rer. nat. Alexandra Wittmar

Fakultät für Chemie - NanoEnergieTechnikZentrum (NETZ)

Address
Carl-Benz-Str. 199
47057 Duisburg
Room
LN 4.13
Phone
+49 203 379 8226

Functions

  • Wissenschaftliche/r Mitarbeiter/in, Prof. Andronescu

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

  • Wittmar, Alexandra S. M.; Salam, Mohamed; Ulbricht, Mathias
    Cellulose-Based Adsorbents for Decontamination of Multi-Pollutant Contaminated Waters
    In: Chemie - Ingenieur - Technik (CIT), Vol. 97, 2025, Nr. 10, pp. 953 – 963
    DOI (Open Access)
  • Wittmar, Alexandra; Bödeker, Wilhelm D.; Hasnain, Najeeb; Hagemann, Ulrich; Olean-Oliveira, André; Čolić, Viktor; Ulbricht, Mathias
    Conversion of acrylic/wool fibers to N-doped carbon materials for adsorption and electrochemical oxygen reduction to hydrogen peroxide
    In: Surfaces and Interfaces, Vol. 69, 2025, 106756
    DOI (Open Access)
  • Wittmar, Alexandra S. M.; Prymak, Oleg; Homm, Thomas; Surholt, Felix; Uhlemann, Jörg; Stranghöner, Natalie; Ulbricht, Mathias
    Formation of all-biopolymer-based composites with cellulose as the main component
    In: RSC Applied Interfaces, Vol. 2, 2025, Nr. 2, pp. 508 – 520
    DOI (Open Access)
  • 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
    DOI (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
    DOI (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
    DOI (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
    DOI (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
    DOI (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
    DOI
  • 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
    DOI
  • 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
    DOI, 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
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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
    DOI (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
    DOI
  • 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
    DOI (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
    DOI (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
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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, 1463
    DOI
  • 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
    DOI
  • 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
    DOI
  • 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
    DOI

    • Abstracts

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