Cooperative work of the hda research group

Production of nanoparticles with micro process technology (C. Graf & F. Schael).

Theses:

  • Simon Stiller, Optimization of the synthesis of gold-shell silica nanoparticles using microreactor technology (bachelor's thesis, 2018).
  • Benjamin Steup, Investigation and optimization of microreactor-assisted synthesis of silica noble metal core-shell particles (bachelor's thesis, 2021)
  • Florian Wolf, Bachelor's thesis, Investigation of the formation of silica particles covered with gold clusters in the microreactor as a precursor to the synthesis of metal shell particles (2022)
  • Julie Teumi, Optimization of silver coating of silica nanoparticles using a microreactor (professional internship semester, 2021).

Publications:

  • Scheghajegh Kord Daroun Kalai, Simon Stiller, Frank Schael, Christina Graf, Metal Shell Silica Core Nanoparticles - Progresses and Applications, 27th Assembly of the Advanced Materials Congress, (invited talk, Stockholm, 2019).
  • Christina Graf, Scheghajegh Kord Daroun Kalai, Simon Stiller, Benjamin Steup, Florian Wolf, Madlen Schmudde, Thomas Risse, Frank Schael, "Advances in the Preparation and Application of metal shell particles, semi-shell particles, and arrays thereof", Second EUt+ Workshop on Nanomaterials and Nanotechnologies, (invited talk, Cartagena / Spain, 2022).
  • F. Schael, Continuous chemical manufacturing with milli/microreactors for fine chemicals and nanomaterials, Second EUt+ Workshop on Nanomaterials and Nanotechnologies (virtual lecture, Cartagena / Spain, 2022).

Preparation of highly purified formaldehyde for Raman spectroscopic studies (D. Geyer & F. Schael).

Student work

  • Benjamin Smith, Construction and test operation of a microreactor system for high-temperature gas phase reactions (Master's thesis, Darmstadt, 2020).
  • Marcus Probst, Production of formaldehyde by thermolysis of paraformaldehyde for calibration of a gas analysis, lab report, Darmstadt 2018.

Publications

  • Kevin Dieter, Dirk Geyer, Konrad Koschnick, Martin Richter and Frank Schael, nvestigation of the Temperature dependent Cross Section of Gaseous Formaldehyde, Polytechnic Summit (registered talk, Darmstadt, 2022).
  • Dieter, K., Richter, M., Trabold, J., Koschnick, K., Schael, F., Dreizler, A., Geyer, D.: Temperature Dependent Raman Spectra of Pure, Gaseous Formaldehyde for Combustion Diagnostics. Proc. Combust. Inst. 39, accepted for publication.

Syntheses and diagnostics of nanomaterials (Graf, Geyer, Schael)

Research project funded by the Central Research Funding of the ZFE Center of Darmstadt University of Applied Sciences, since 2021.

Clean Circles - Iron as an energy carrier of a climate-neutral circular economy (Geyer, Hartl)

Focus 1: Laser diagnostic investigation of the Fe-O ratio of microparticles in oxidation and reduction processes

Focus 2: Scale-reduced modeling for reduction and oxidation of iron(oxide) considering heterogeneous kinetics and complex mixing processes

Raman spectroscopic data analysis (Geyer, Weinmann)

Supervision of a PhD thesis started in 02/2022 on "Development of robust application-adapted machine learning methods for the analysis of Raman spectroscopic process diagnostic data". This deals with data analysis of already existing measurement data acquired with existing spectrometer setups in the cooperation of the Department of Reactive Flows and Measurement (FG RSM, A. Dreizler) of TUDa and the ODEE laboratory.

Experimental and numerical investigation of gas species concentrations and temperatures in reacting flows of renewable fuels such as H2 (Geyer, Hartl).

In the cooperation of the Department of Reactive Flows and Metrology (FG RSM, A. Dreizler) at TUDa and the ODEE laboratory (Hartl, Geyer), a highly flexible code that can be intuitively applied to different site or measurement stands is further developed to evaluate experimental data from combined Raman and Rayleigh measurements. The code is based on the hybrid matrix inversion approach and allows flexible evaluation of experimental data and calculation of species concentrations and temperatures.

Regime identification based on Raman/Rayleigh line measurements and numerical data sets canonical flame configurations and technical applications (Hartl, Geyer).

Focus: Gradient-free detection and characterization of reaction zones from instantaneous 1D Raman/Rayleigh measurement data of the main species and temperature as well as from instantaneous numerical data.