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Torsten Kowald

 
 
  Torsten Kowald
 
 

Anschrift:

 
 

Dr. rer. nat. Torsten Kowald

 
 

Universität Siegen
Naturwissenschaftlich-Technische Fakultät
Department Chemie - Biologie
Institut für Bau- und Werkstoffchemie
Paul-Bonatz-Str. 9-11
57076 Siegen-Weidenau

Tel.: 0271-740 4702 (direkt)
Sekr.: 0271-740 2901
Fax: 0271-740 2938
E-Mail: kowald@chemie.uni-siegen.de

 
 
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Tätigkeitsfeld

  • Nanokomposite auf Basis anorganischer Bindemittel
  • Betreuung des SPM-Labors (AFM, STM, CLSM, SNOM)
  • Betreuung der Röntgenpulverdiffraktometrie
  • Betreuung der Lichtmikroskopie

Spezialgebiete

  • Charakterisierung der Mikro- und Nanostruktur von Bindemitteln
  • Röntgenpulverdiffraktometrie und Rietveld Methode

Veröffentlichungen, peer-reviewed

  • Emami, Mohammadamin; Kowald, Torsten; Trettin, Reinhard (2016): Preliminary archaeometallur-gical studies on copper extraction from polymetallic ore sources in Meymand, south central Iranian desert. In Archaeol Anthropol Sci. DOI: 10.1007/s12520-016-0319-y.
  • Krämer, Christina; Kowald, Torsten L.; Butters, Volker; Trettin, Reinhard H. F. (2016): Carbon nano-tube-stabilized three-phase-foams. In J Mater Sci 51 (8), pp. 3715–3723. DOI: 10.1007/s10853-015-9689-2.
  • Sepideh Khandan Del and Rainer Bornemann and Andreas Bablich and Heiko Schäfer-Eberwein and Jiantong Li and Torsten Kowald and Mikael Östling and Peter Haring Bolívar and Max C Lem-me (2015): Optimizing the optical and electrical properties of graphene ink thin films by laser-annealing. In: 2D Materials 2 (1), S. 11003.
  • Krämer, Christina; Kowald, Torsten L.; Trettin, Reinhard H.F. (2015): Pozzolanic hardened three-phase-foams. In Cement and Concrete Composites 62, pp. 44–51. DOI: 10.1016/j.cemconcomp.2015.06.002.
  • Krämer, Christina; Schauerte, Matthias; Kowald, Torsten L.; Trettin, Reinhard H.F. (2015): Three-phase-foams for foam concrete application. In Materials Characterization 102, pp. 173–179. DOI: 10.1016/j.matchar.2015.03.004.
  • Roßkopf, C.; Afflerbach, S.; Schmidt, M.; Görtz, B.; Kowald, T.; Linder, M.; Trettin, R. (2015): Investi-gations of nano coated calcium hydroxide cycled in a thermochemical heat storage. In Energy Conversion and Management 97, pp. 94–102. DOI: 10.1016/j.enconman.2015.03.034.
  • Butters, Volker; Kowald, Torsten; Mahjoori, Majid; Trettin, Reinhard (2015): Surface Modified Car-bon Nanotubes for an Enhanced Interaction with Cement Based Binders. In Konstantin Sobolev, Surendra P. Shah (Eds.): Nanotechnology in Construction. Cham: Springer International Publish-ing, pp. 253–258.
  • Krämer, Christina; Kowald, Torsten; Trettin, Reinhard (2015): Three-Phase-Foams as New Light-weight Materials and Their Use in Foam Concretes. In Konstantin Sobolev, Surendra P. Shah (Eds.): Nanotechnology in Construction. Cham: Springer International Publishing, pp. 435–439.
  • Krämer, Christina; Schauerte, Matthias; Kowald, Torsten; Trettin, Reinhard (2015): CNT-stabilized foam concrete on the basis of ultra high performance concrete (UHPC). In: Proceedings of the ICCC 2015.
  • Butters, V.; Kowald, T.; Trettin, R. (2013): Coating of CNTs by SiO2 and their influence on hydrating tricalcium silicate. In: 1st International Conference on the Chemistry of Construction Materials. Ber-lin, October 7 - 9, 2013. Frankfurt, M: GDCh (GDCh monograph, 46), pp. 377–380.
  • Korpa, A.; Kowald, T.; Trettin, R. (2014): Principles of development, phase composition and nanostructural features of multiscale Ultra High Performance Concrete modified with pyrogenic nanoparticles – A review article. In American Journal of Materials Science and Application 2 (2), pp. 17–30. Available online at http://www.openscienceonline.com/journal/archive2?journalId=730&paperId=163.
  • Korpa, A.; Kowald, T.; Trettin, R.; Kota, T.; Xhaxhiu, K.; Mele, A. (2012): Pyrogenic Tiny Particles for Large Contributions on the Properties of Advanced Ultra High Performance Cement-based Com-posites. In Maria S. Konsta-Gdoutos (Ed.): 4th International Symposium on Nanotechnology in Construction. Proceedings of the NICOM4.
  • Emami, S. M. A.; Kowald, T.; Trettin, R. (2009): Mineralogical and Chemical Investigation on the Recrystallization Process During Sintering in Phase-Interface Areas in Ancient Ceramic Matrices. In Materials and Manufacturing Processes 24 (9), pp. 934–941. DOI: 10.1080/10426910902979934.
  • Korpa, A.; Kowald, T.; Trettin, R. (2009): Phase development in normal and ultra high performance cementitious systems by quantitative X-ray analysis and thermoanalytical methods. In Cement and Concrete Research, p. Vol. 39, No. 2 (2009),69-76.
  • Kowald, T.; Eser, S.; Trettin, R. (2009): Carbon nanostructures incorporated to C3S- and cement-based binders. In Zement 3, pp. 89–92.
  • Kowald, T.; Trettin, R. (2009): Improvement of Cementitious Binders by Multi-Walled Carbon Nano-tubes. In Zdeněk Bittnar, Peter J. M. Bartos, Jiri Nemecek, Vit Šmilauer, Jan Zeman (Eds.): Nano-technology in Construction 3: Springer, pp. 261–266.
  • Korpa, A.; Kowald, T.; Trettin, R. (2008): Hydration behaviour, structure and morphology of hydration phases in advanced cement-based systems containing micro and nanoscale pozzolanic additives. In Cement and Concrete Research 38 (7), pp. 955–962.
  • Kowald, Torsten; Eser, Sancar; Trettin, Reinhard (2007): Carbon nanostructures incorporated to C3S- and cement-based binders. In J. Beaudoin (Ed.): 12th International Congress on the Chemis-try of Cement. Available online at http://www.iccc2007.org/.
  • Jiang, Xin; Kowald, Torsten; Staedler, Torsten; Trettin, Reinhard (2005): Carbon nanotubes as a new reinforcement material for modern cement-based binders. In Yolanda R. de Miguel (Ed.): 2nd international Symposium on Nanotechnology in Construction. NICOM 2 ; Bilbao, Spain, 13 - 16 November 2005. Bagneux: RILEM Publications (RILEM proceedingsPRO, 45), pp. 209–213.
  • Korpa, A.; Trettin, R. (2005): Pyrogenic nano-oxides in modern cement based composites. In Yolanda R. de Miguel (Ed.): 2nd international Symposium on Nanotechnology in Construction. NICOM 2 ; Bilbao, Spain, 13 - 16 November 2005. Bagneux: RILEM Publications (RILEM procee-dingsPRO, 45), pp. 313–319.

Weitere Veröffentlichungen

  • Butters, V.; Kowald, T.; Mahjoori, M.; Trettin, R. (2015): Wechselwirkung von oberflächenmodifizier-ten Carbon Nanotubes mit zementären Bindemittelsystemen. In Horst Michael Ludwig, Hans-Bertram Fischer (Eds.): Tagungsbericht / Ibausil, 19. Internationale Baustofftagung, 16. - 18. Sep-tember 2015, Weimar, Bundesrepublik Deutschland, vol. 1. Weimar: Bauhaus-Univ, pp. 1-1207 - 1-1213.
  • Krämer, Christina; Kowald, Torsten; Trettin, Reinhard (2015): Dreiphasenschäume als neue Leicht-bauwerkstoffe und deren Einsatz in Schaumbeton und Ultrahochleistungsschaumbeton. In Horst Michael Ludwig, Hans-Bertram Fischer (Eds.): Tagungsbericht / Ibausil, 19. Internationale Bau-stofftagung, 16. - 18. September 2015, Weimar, Bundesrepublik Deutschland, vol. 2. Weimar: Bau-haus-Univ, pp. 2-1391 - 2-1397.
  • Krämer, Christina; Schauerte, Matthias; Kowald, Torsten; Trettin, Reinhard (2015): CNT-stabilisierte Ultrahochleistungsschaumbetone. In Horst Michael Ludwig, Hans-Bertram Fischer (Eds.): Ta-gungsbericht / Ibausil, 19. Internationale Baustofftagung, 16. - 18. September 2015, Weimar, Bun-desrepublik Deutschland, vol. 2. Weimar: Bauhaus-Univ, pp. 2-227 - 2-234.
  • Schauerte, Matthias; Kowald, Torsten; Trettin, Reinhard (2015): Minerally bond foams modified by different types of nanoscale materials. In Konstantin Sobolev, Surendra P. Shah (Eds.): Nanotech-nology in Construction. Supplementary Proceedings.
  • Trettin, Reinhard; Kowald, Torsten; Korpa, Arjan (2015): Nanoparticles in Ultra- High Performance Concretes. In Konstantin Sobolev, Surendra P. Shah (Eds.): Nanotechnology in Construction. Supp-lementary Proceedings.
  • Butters, V.; Kowald, T.; Mahjoori, M.; Trettin, R. (2014): Obertflächenmodifizierte Carbon Nanotubes für eine verbesserte Wechselwirkung mit zementären Bindemittelsystemen. In Bernhard Midden-dorf (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauchemie. 6. - 8. Oktober 2014, Kassel. (Stand: 19.08.2014). Frankfurt, M: GDCh (Monographie / Gesellschaft Deutscher Chemiker, 48), pp. 163–166.
  • Kowald, T.; Schauerte, M.; Trettin, R.; Weber, P. (2014): Nano-engineered Ultra-High Performance Concrete for leakage-free, low-maintenance Cementing (ceUHPC). In Robert McCaffrey (Ed.): 1st Global Well Cem Conference and Exhibition 2014. 1st Global Well Cem Conference and Exhibition 2014. Dubai, UAE, 13.-14.1.2014 (1).
  • Schauerte, M.; Kowald, T.; Trettin, R. (2014): Der Einfluss nanoskaliger Zusatzstoffe auf die Eigen-schaften minerailischer Schäume. In Bernhard Middendorf (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauchemie. 6. - 8. Oktober 2014, Kassel. (Stand: 19.08.2014). Frankfurt, M: GDCh (Monographie / Gesellschaft Deutscher Chemiker, 48), pp. 105–108.
  • Trettin, R.; Kowald, T.; Korpa, A. (2014): Einsatz von Nanopartikeln in Hochleistungsbindemittelsys-temen. In Bernhard Middendorf (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauchemie. 6. - 8. Oktober 2014, Kassel. (Stand: 19.08.2014). Frankfurt, M: GDCh (Monographie / Gesellschaft Deutscher Chemiker, 48), pp. 49–52.
  • Weitzel, B.; Hansen, M. R.; Kowald, T. L.; Müller, T.; Spiess, H. W.; Trettin, H. F. R. (2012): Spectro-scopic Studies of the Influence of Multi-Walled Carbon Nanotubes on the Hydration of Tricalcium Silicate and Microstructure of Calcium Silicate Hydrate Phases. In Maarten A.T.M Broekmans (Ed.): Proceedings of the 10th International Congress for Applied Mineralogy (ICAM): Springer Berlin Heidelberg, pp. 765–772. Available online at http://dx.doi.org/10.1007/978-3-642-27682-8_92.
  • Butters, V.; Kowald, T.; Trettin, R. H. F. (2011): Untersuchungen zur Beeinflussung der Interfacial Transition Zone: In F. Schmidt-Döhl (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauchemie. 6. und 7. Oktober 2011 in Hamburg-Harburg. Frankfurt, Main: GDCh Ges. Dt. Chemiker (GDCh-Monographie, 44), pp. 295–300.
  • Trettin, R.; Kowald, T. (2011): Nutzung von Nanopartikeln zur Eigenschaftsverbesserung von Bin-demittelsystemen. In F. Schmidt-Döhl (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauche-mie. 6. und 7. Oktober 2011 in Hamburg-Harburg. Frankfurt, Main: GDCh Ges. Dt. Chemiker (GDCh-Monographie, 44), p. 55.
  • Weitzel, B.; Hansen, M. R.; Kowald, T.; Müller, T.; Spiess, H. W.; Trettin, R. (2011): Der Einfluss von Multiwalled Carbon Nanotubes auf die Struktur von CSH-Phasen. In F. Schmidt-Döhl (Ed.): Tagung Bauchemie der GDCh-Fachgruppe Bauchemie. 6. und 7. Oktober 2011 in Hamburg-Harburg. Frankfurt, Main: GDCh Ges. Dt. Chemiker (GDCh-Monographie, 44), p. 178.
  • Kowald, Torsten; Trettin, Reinhard (2008): Improvement of Modern Building Materials by Carbon Nanotubes. In: 8th International Symposium on Utilization of High-Strength and High-Performance Concrete, pp. 206–211.
  • Kowald, Torsten; Trettin, Reinhard; Dörbaum, Nils; Städler, Thorsten; Jiang, Xin (2008): Influence of Carbon Nanotubes on the micromechanical properties of a model system for ultra-high perfor-mance concrete. In Ekkehard Fehling (Ed.): Ultra high performance concrete. (UHPC) ; proceed-ings of the Second International Symposium on Ultra High Performance Concrete, Kassel, Germa-ny, March 05 - 07, 2008, vol. 10. Kassel: Kassel Univ. Press (Structural materials and engineering series, No. 10), pp. 129–134.
  • Kowald, Torsten; Trettin, Reinhard H. F. Prof. Dr. (2007): Aktive Beeinflussung der Hydratation und des Mikro- / Nanogefüges durch Einsatz kohlenstoffbasierter Nanoröhren. In Reinhard Trettin (Ed.): Tagung Bauchemie. Der GDCh-Fachgruppe Bauchemie 27. bis 28. September 2007 in Siegen, vol. 37. With assistance of Torsten Kowald. 1. Aufl. Frankfurt am Main: Gesellschaft Dt. Chemiker (GDCh Monographie, 37), pp. 37–46.
  • Trettin, Reinhard; Kowald, Torsten (2005): Nanotubes für Hochleistungsbetone. In BFT INTERNA-TIONAL Betonwerk + Fertigteil-Technik 71 (2), pp. 20–21.
  • Korpa, A.; Trettin, R. (2004): The use of synthetic colloidal silika dispersions for making high per-formance und ultra high performance systems (HPC/UHPC). In M. Schmidt (Ed.): Ultra high per-formance concrete (UHPC). Proceedings of the International Symposium on Ultra High Perfor-mance Concrete, Kassel, Germany, September 13 - 15, 2004. Kassel: Univ. Press (Schriftenreihe Baustoffe und Massivbau, 3), pp. 155–164.
  • Kowald, Torsten; Trettin, Reinhard (2004): Influence of surface-modified Carbon Nanotubes on Ultra-High Performance Concrete. In M. Schmidt (Ed.): Ultra high performance concrete (UHPC). Proceedings of the International Symposium on Ultra High Performance Concrete, Kassel, Germa-ny, September 13 - 15, 2004. Kassel: Univ. Press (Schriftenreihe Baustoffe und Massivbau, 3), pp. 195–202.
  • Kowald, Torsten; Trettin, Reinhard (2004): Kohlenstoffbasierte Nanostrukturen in modernen anor-ganischen Bindemitteln. In J. Neubauer (Ed.): Tagung Bauchemie. GDCh-Fachgruppe Bauchemie, 7. und 8. Oktober 2004 in Erlangen, vol. 31. Frankfurt am Main: Gesellschaft Dt. Chemiker (GDCh-Monographie, 31), pp. 162–165.