Dr.-Ing. Graduations at I911N after 2017
Dipl.-Ing. Miriam Willger successfully defended her doctoral thesis on March 13th, 2026.
On March 13th, 2026, Dipl.-Ing. Miriam Willger successfully (magna cum laude) defended her doctoral thesis entitled
“Derivabilitry of Activity Coefficients from Raman spectra”.
As a consequence, the title “Doktor Ingenieur” was conferred on her by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg.
Miriam Willger joined I911N as doctoral researcher after she had completed the Diplom-studying prgram "Verfahrenstechnik" at 911BAF. She contributed to several journal papers:
C
, https://doi.org/10.1021/acs.iecr.5c02469 (2025)
(2024)
Felix Spiske M.Sc. successfully defended his doctoral thesis on December 12th, 2025.
On December 12th, 2025, Felix Spiske M.Sc. successfully (magna cum laude) defended his doctoral thesis entitled
“Aerogel-lined capillaries as liquid core waveguides fopr Raman signal gain of aqueous samples”.
As a consequence, the title “Doktor Ingenieur” was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg.
Felix Spiske joined I911N as doctoral researcher after he had completed the master programme “Technische Chemie” at 911 Darmstadt. He contributed to several journal papers:
(2024)
For his scientific article “Particulate vs monolithic aerogel linings in capillaries for Raman signal gain of aqueous solutions,” he was awarded the “Best Author Award” at the Herbstkolloquium Prozessanalytik 2025, held at the DECHEMA-Haus in Frankfurt am Main.
As part of his research work at I911N, Felix Spiske has also contributed his research topics to the “Pop Up Science” series, which makes scientific topics accessible to a non-scientific audience:
He has received various awards for his contributions to scientific conferences and seminars:
- „Poster & Pitch mit bester Story“ on Doktorandenseminar Prozessanalytik at 911 2025 ()
- 1st Poster Award on Herbstkolloquium Prozessanalytik at MERCK Darmstadt, 4.-6th of December 2024 (/news/itun-doktorand-gewinnt-posterpreis)
3rd Presentation Award on Doktorandenseminar Prozessanalytik at Fraunhofer IPM, Freiburg 2024 ()
Martin Dirauf M.Sc. successfully defended his doctoral thesis on August 30th, 2024.
On August 30th, 2024, Martin Dirauf M.Sc. successfully (summa cum laude) defended his doctoral thesis entitled
“Mass transfer during biopolymer aerogel production: measurement and modeling”.
As a consequence, the title “Doktor Ingenieur” was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg.
Martin Dirauf joined I911N as doctoral researcher after he had completed the master programme “Chemie- und Bioingeneiurwesen” at Friedrich-Alexander-Ծä Erlangen-Nürnberg. He contributed to several journal papers:
Michael Fechter M.Sc. successfully defended his doctoral thesis on August 28th, 2023.
On August 28th, 2023, Michael Fechter M.Sc. successfully defended his doctoral thesis entitled
“Measurement of thermodynamic data at elevated pressure and temperature conditions with a microfluidic setup”.
As a consequence, the title “Doktor Ingenieur” was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg.
Michael Fechter joined I911N as doctoral researcher after he had completed the master programme “Verfahrenstechnik” at 911BAF. He contributed to several journal papers:
Laura Lohmeier M.Sc. successfully defended her doctoral thesis on March 27th, 2023.
On March 27th, 2023 Laura Lohmeier M.Sc. Lohmeier successfully defended her doctoral thesis entitled
“Agglomerationstechnologien für Reststoffe aus Midrex-Direktreduktionsanlagen”.
As a consequence, the title “Doktor Ingenieur” was conferred on her by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. Laura Lohmeier contributed to several journal papers:
Katja Schaldach M.Sc. successfully defended her doctoral dissertation on June 22nd, 2022.
Dr.-Ing. Katja Schaldach successfully defended her doctoral dissertation on June 22nd, 2022. As a consequence, the title Dr.-Ing. was bestowed on her by the faculty 4 on behalf of the 911 Bergakademie Freiberg.
The title of her thesis is “Mechanical and thermal conversion of agricultural by-products for the generation of pelletized adsorbents”.
Dr.-Ing. Katja Schaldach joined the I911N-Team as doctoral researcher in 2015 and since has been investigating into the mechanical, thermal and chemical treatment of agricultural by-products for their conversion into pelletized adsorbents. The target was (and has been achieved) the generation of pelletized adsorbents which are competitive to commercially available pelletized activated carbons. From her research some publications resulted:
- Aktivierung und Formgebung zur Verbesserung der Eigenschaften von Adsorbentien aus Agrarreststoffen
(K. Schaldach, V. Herdegen, H.-W. Schröder, J.-U. Repke; Chemie Ingenieur Technik 89 (2017) 12, S. 1669-1678, DOI: 10.1002/cite.201700064) - Agglomerationstechnik auf der ACHEMA 2018
(L. Lohmeier, K. Schaldach, F. Fehse, H.-W. Schröder; Chemie Ingenieur Technik 90 (2018) 12, S. 1998-2003, DOI: 10.1002/cite.201800155) - A concept for an integrated process scheme for by-products from rice and sugarcane processing
(K. Schaldach, H.-W. Schröder, V. Herdegen, D. N. Vinh; Chemie Ingenieur Technik 92 (2020) 11, S. 1790-1796, DOI: 10.1002/cite.202000088) - K. Schaldach, V. Herdegen, A.S. Braeuer, Do Nang Vinh, Nguyen Van Toan, Le Van Tam „Sustainable value added material use of occurring by-products from sugar and rice production in Vietnam”
Science of the Total Environment (2022), 835, 155414,
10.1016/j.scitotenv.2022.155414
Medhanie Tesfay Gebrekidan M.Sc. hon. successfully defended his doctoral thesis on January 17th, 2022.
On January 17th, 2022, Medhanie Tesfay Gebrekidan M.Sc. hon. successfully defended his doctoral thesis.
As a consequence, the title “Doktor Ingenieur” was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. The title of his thesis is:
"Refinement of Raman spectra from extreme background and noise interferences – Cancer diagnostics using Raman spectroscopy"
Dr.-Ing. Gebrekidan was carrying out his research first as scholarship holder at the Erlangen-Graduate School in Advanced Optical Technologies at the Friedrich-Alexander-University Erlangen-Nürnberg, before he moved with his supervisor to the 911 Bergakademie Freiberg. After the move he continued his research funded by the Wilhelm-Sander-Stiftung (Krebsforschungsförderung). Most recognizable are his achievements in the field of spectra processing using methods of artificial intelligence. As a doctoral researcher he contributed significantly to the following high-class publications:
- M.T. Gebrekidan, Ch. Knipfer, A.S. Braeuer
Raman Fiber Bundle Probe of Individually Filter-Coated Fibers
International Journal of Optics and Photonic Engineering (accepted December 2021)
Leo Alexander Bahr M.Sc. successfully defended his doctoral thesis on July 9th, 2021.
On July 9th, 2021, Leo Alexander Bahr M.Sc. successfully defended his doctoral thesis.
As a consequence, the title “Doktor Ingenieur” was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. The title of his thesis is:
"Multivariate Untersuchungen in Gasphasenprozessen und Aerosolen mittels Raman-Spektroskopie"
Dr. Bahr was carrying out his main research within a DFG-funded project “Online Bestimmung der polymorphen Modifikation kristalliner Nanopartikel in der Gasphase” (Online assessment of the crystalline modification of nanoparticles in the gas phase). As a doctoral researcher he contributed significantly to the following high-class publications:
Simon Stehle M.Sc. successfully defended his doctoral thesis on November 20th, 2020.
Simon Stehle M.Sc. promoted to Doctor in Engineering (Dr.-Ing)
On November 20th, 2020, Simon Stehle M.Sc. successfully defended his Doctoral thesis. As a consequence the title "Doktor Ingenieur" was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. The title of his thesis is:
"Raman spektroskopische Untersuchung von einphasigen strukturierten Stoffgemischen in einem Mikrokapillarsystem (Investigations into single-phase structured fluid systems in micro-capillaries using Raman spectroscopy)"
Doctor Stehle was carrying out his research within the frame of an ERC Starting grant project "Inhomogeneities" (637654). As a doctoral researcher he contributed significantly to the following high-class publications:
Dr. Stehle has been working for Eisenbau Heilbronn since April 2019
Julian Schuster M.Sc. successfully defended his doctoral thesis on March 6th, 2020.
Julian Schuster M.Sc. promoted to Doctor in Engineering (Dr.-Ing)
On March 6th, 2020, Julin Schuster M.Sc. successfully defended his Doctoral thesis. As a consequence the title "Doktor Ingenieur" was conferred on him by the Friedrich-Alexader-Ծä Erlangen-Nürnberg. The title of his thesis is:
"Insights into near-critical and supercritical fluid technologies for the treatment of food using Raman spectroscopy"
As a doctoral researcher he contributed significantly to the following high-class publications:
- J.J. Schuster, L.A. Bahr, L. Fehr, M. Tippelt, J. Schulmeyr, A. Wuzik, A.S. Braeuer
Online monitoring of the supercritical CO2 extraction of hop
The Journal of Supercritical Fluids 133, 139-145 (2018)
- A.S. Braeuer, J.J. Schuster, M.T. Gebrekidan, L. Bahr, F. Michelino, A. Zambon, S. Spilimbergo
In situ Raman-analysis of CO2–assisted drying of fruit-slices
Foods 37, 6, 11 pages (2017)
- V. Strobel, J.J. Schuster, A.S. Braeuer, L. Vogt, H. Junge, M. Haumann
Shining light onto the low-temperature methanol aqueous-phase reforming using homogeneous Ru-pincer complexes – operando Raman-GC studies
Reaction Chemistry & Engineering 2, 390-396 (2017)
- G. Ferrentino, J.J. Schuster, A. Braeuer, S. Spilimbergo
In situ Raman quantification of the dissolution kinetics of carbon dioxide in liquid solutions during a dense phase and ultrasound treatment for the inactivation of Saccharomyces cerevisiae
The Journal of Supercritical Fluids 111, 104-111 (2016)
- J.J. Schuster, Ph. Siegler, A. Guenther, K.-E. Wirth, A. Braeuer
Simultaneous analysis of the dispersed liquid and the bulk gas phase of water sprays using Raman spectroscopy
Applied Spectroscopy 70, 1055-1062 (2016)
- A. Braeuer, R. F. Hankel, M. K. Mehnert, J.J. Schuster, S. Will
A Raman technique applicable for the analysis of the working principle of promoters and inhibitors of gas hydrate formation
Journal of Raman Spectroscopy 46, 1145-1149 (2015)
- J. J. Schuster, S. Will, A. Leipertz, A. Braeuer
Deconvolution of Raman spectra for the quantification of ternary high pressure phase equilibria composed of carbon dioxide, water and organic solvent
Journal of Raman Spectroscopy 45, 246-252 (2014) - S.K. Luther, J.J. Schuster, A. Leipertz, A. Braeuer
Microfluidic investigation into mass transfer in compressible multi-phase systems composed of oil, water and carbon dioxide at elevated pressure
The Journal of Supercritical Fluids 84, 121-131 (2013)
- S. K. Luther, J. J. Schuster, A. Leipertz, A. Braeuer
Non-invasive quantification of phase equilibria of ternary mixtures composed of carbon dioxide, organic solvent and water
The Journal of Supercritical Fluids 84, 146-154 (2013)
- R. Adami, J. J. Schuster, S. Liparoti, E. Reverchon, A. Leipertz, A. Braeuer
A Raman spectroscopic method for determining vapour liquid equilibria
Fluid Phase Equilibria 360, 265-273 (2013)
Dr. Schuster has been working for Linde Gas since August 2018.
Tobias Klima M.Sc. successfully defended his doctoral thesis on December 17th, 2019.
Tobias Klima M.Sc. promoted to Doctor in Engineering (Dr.-Ing)
On December 17th, 2019, Tobias Klima M.Sc. successfully defended his Doctoral thesis. As a consequence the title "Doktor Ingenieur" was conferred on him by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. The title of his thesis is:
"Quantitative insights into the transcritical mixture formation at diesel relevant conditions"
Doctor Klima was carrying out his research within the frame of an ERC Starting grant project "Inhomogeneities" (637654). As a doctoral researcher he contributed significantly to the following high-class publications:
Dr. Klima has been working for Diehl Defence since November 2018.
Christine Holzammer M.Sc. successfully defended her doctoral thesis on October 18th, 2019.
On October 18th, 2019, Christine Holzammer M.Sc. successfully defended her Doctoral thesis. As a consequence the title "Doctor Ingenieurin" was conferred on her by the Faculty 4 on behalf of the Technische Ծä Bergakademie Freiberg. The title of her thesis is:
"Raman Spectroscopic Study of the Effect of Aqueous Salt Solutions on the Formation and Dissociation Behavior of CO2 Gas Hydrates"
Doctor Holzammer was carrying out her research within the frame of an ERC Starting grant project "Inhomogeneities" (637654). As a doctoral researcher she contributed significantly to the following high-class publications:
- Ch. C. Holzammer, A.S. Braeuer
Raman spectroscopic study of the effect of aqueous salt solutions on the inhibition of carbon dioxide gas hydrates
The Journal of Physical Chemistry B 123, 2354-2361 (2019)
- Ch. Holzammer, J. Schicks, S. Will, A.S. Braeuer
Influence of Sodium Chloride on the Formation and Dissociation Behavior of CO2 Gas Hydrates
The Journal of Physical Chemistry B 121, 8330-8337 (2017)
- Ch. Holzammer, A. Finckenstein, S. Will, A. Braeuer
How Sodium Chloride Salt Inhibits the Formation of CO2 Gas Hydrates
The Journal of Physical Chemistry B 120, 2452–2459 (2016)
- G. Lipinski, Ch. Holzammer, M. Petermann, M. Richter
Measurement of sorption phenomena near dew points of fluid mixtures: concept for the combination of gravimetric sorption analysis and Raman spectroscopy
Measurement Science and Technology 29, 105501-105506 (2018)
Dr. Holzammer has been working for BASF since July 2019.
Arite Werner M.Sc. successfully defended her doctoral thesis on November 23rd, 2018.
Dr.-Ing. Arite Werner defended her doctoral examination successfully on November 23rd, 2018.
The title of her doctoral thesis is:
"Entwicklung eines membranbasierten Trenn- und Anreicherungsverfahrens zur selektiven Gewinnung von Indium und Germanium aus Laugungslösungen"
The elements indium and germanium are among the economic-strategic elements due to the steadily rising demand and the strong fixation on the nearly sole producer China. Against this background, an alternative method of biohydrometallurgical recovery was investigated at the 2nd Krüger Research College. The focus of this work is the selective separation of indium and germanium from complex model solutions through the application of nanofiltration. By developing a systematic methodology, the pH-dependent separation behaviour of the target elements, with variation of the process parameters and the process control, was specifically investigated. The variation of the pH allows the selective separation of indium and germanium from the model solutions. The transferability to real concentration ratios was successfully implemented by indium enriched in the retentate and germanium was selectively separated with the permeate.
Dipl.-Wi.-Ing. Franz Fehse successfully defebnded his doctoral thesis on June 1st, 2018.
Dr.-Ing. Franz Fehse defended his doctoral examination successfully on June 1st, 2018.
The title of his thesis is “Granulierung von Weichbraunkohle für die stoffliche Nutzung” (Granulation of brown coal for material usage)".
For the material usage of brown coal the mechanical refinement of the coal is an important process step. One example is the production of granules from brown coal with a narrow particle size distribution and high mechanical strength.
In the thesis the granulation of a brown coal from Central Germany was systematically investigated using different procedural approaches. One of the approaches used an intensive mixer for granulation of the coal. In laboratory-scale investigations the influence of the different process and machine parameters was determined independently. Using different sizes of mixers the scale-up behaviour of the granulation process was determined successfully. Thereby it is possible to produce high-quality granules with customised properties e. g. for montan-wax extraction or gas purification.
