Prof. Dr. Bernd Strehmel

Hochschule Niederrhein. Dein Weg.



Lukas Appelhoff won in the competition for the "GDCh Studienreise", which will make possible to attend the next ACS Fall Meeting- Congratulations - there was always big competition and we are proud again that people from our group were selected.

We welcome Xiongfei Luo from China in our group. Xiongfei receied a scholarship from CSRC to pursue research abroad for a year. He is going to do research with Carbon Nanodots with focus on photocatalysis.

Michael Schläpfer successfully his Thesis at the University of Paderborn.

Ceren Kütahya sucessfully defended her thesis at the University of Duisburg-Essen.



Important Publications

Open Access publication

[1]    Y. Pang, A. Shiraishi, D. Keil, S. Popov, V. Strehmel, H. Jiao, J. S. Gutmann, Y. Zou, B. Strehmel, „NIR-sensibilisierte kationische und hybride radikalische/kationische Polymerisation und Vernetzung“, Angew. Chem. 2021, 133, 1486 – 1495.  „NIR-Sensitized Cationic and Hybrid Radical/Cationic Polymerization and Crosslinking“, Angew. Chem. Int Ed. 2021, 60, 1465-1473.

[2]    D. Oprych, B. Strehmel, „Mediated Generation of Conjugate Acid by UV and Blue Sensitizers with Upconversion Nanoparticles at 980 nm“, Chemistry – A European Journal 2020, accepted, 

[3] C. Kütahya, P. Wang, S. Li, S. Liu, J. Li, Z. Chen, B. Strehmel, „Kohlenstoff-Nanopunkte als Photokatalysatoren für die freie radikalische und ATRP-basierte radikalische Photopolymerisation mit blauen LEDs“, Angewandte Chemie 2020, 132, 3192-3197. „Carbon Dots as a Promising Green Photocatalyst for Free Radical and ATRP-Based Radical Photopolymerization with Blue LEDs“, Angewandte Chemie International Edition 2020, 59, 3166-3171. Selected as hot Paper.

[4]    C. Kütahya, N. Meckbach, V. Strehmel, J. S. Gutmann, B. Strehmel, „NIR Light-Induced ATRP for Synthesis of Block Copolymers comprising UV-absorbing Moieties“, Chemistry – A European Journal 2020, 26, 10444-10451.

[5]    B. Strehmel, C. Schmitz, C. Kütahya, Y. Pang, A. Drewitz, H. Mustroph, „Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0“, Beilstein journal of organic chemistry 2020, 16, 415-444.

[6] B. Strehmel, C. Schmitz, K. Cremanns, J. Göttert, „Photochemistry with Cyanines in the Near Infrared: A Step to Chemistry 4.0 Technologies“, Chemistry – A European Journal 2019, 25, 12855-12864.  Belongs to the top 20% of accepted manuscripts. Frontispiece: „Frontispiece: Photochemistry with Cyanines in the Near Infrared: A Step to Chemistry 4.0 Technologies“, Chemistry – A European Journal 2019, 25

[7] A. Kocaarslan, C. Kütahya, D. Keil, Y. Yagci, B. Strehmel, „Near-IR and UV-LED Sensitized Photopolymerization with Onium Salts Comprising Anions of Different Nucleophilicities“, ChemPhotoChem 2019, 3, 1127-1132.

[8] D. Oprych, C. Schmitz, C. Ley, X. Allonas, E. Ermilov, R. Erdmann, B. Strehmel, „Photophysics of Up-Conversion Nanoparticles: Radical Photopolymerization of Multifunctional Methacrylates Comprising Blue- and UV-Sensitive Photoinitiators“, ChemPhotoChem 2019, 3, 1119-1126. we also won the cover feature: „Cover Feature: Photophysics of Up-Conversion Nanoparticles: Radical Photopolymerization of Multifunctional Methacrylates Comprising Blue- and UV-Sensitive Photoinitiators (ChemPhotoChem 11/2019)“, ChemPhotoChem 2019, 3, 1057-1057.

Further selected articles

[1]    C. Schmitz, T. Poplata, A. Feilen, B. Strehmel, „Radiation crosslinking of pigmented coating material by UV LEDs enabling depth curing and preventing oxygen inhibition“, Progress in Organic Coatings 2020, 144, 105663.

[2] C. Schmitz, Y. Pang, A. Guelz, M. Gläser, J. Horst, M. Jaeger, B. Strehmel, "New High-Power LEDs Open Photochemistry for Near-Infrared-Sensitized Radical and Cationic Photopolymerization" Angew. Chem., Int. Ed. 2019, 58, 4400-4404. "Neue Hochleistungs-LEDs ermöglichen Photochemie für die Nahinfrarot-sensibilisierte radikalische und kationische Photopolymerisation" Angewandte Chemie 2019, 131, 4445-4450. selected as VIP paper by the editor.

[3] C. Kütahya, Y. Yagci, B. Strehmel, „Near-Infrared Photoinduced Copper-Catalyzed Azide-Alkyne Click Chemistry with a Cyanine Comprising a Barbiturate Group“, ChemPhotoChem 2019, 3, 1180-1186.

[4] C. Schmitz, B. Strehmel, „NIR LEDs and NIR lasers as feasible alternatives to replace oven processes for treatment of thermal-responsive coatings“, Journal of Coatings Technology and Research 2019, 16, 1527-1541. <Go to ISI>://WOS:000498638400002

[5] C. Kütahya, C. Schmitz, V. Strehmel, Y. Yagci, B. Strehmel, "Near‐Infrared Sensitized Photoinduced Atom‐Transfer Radical Polymerization (ATRP) with a Copper(II) Catalyst Concentration in the ppm Range" Angew. Chem. Int. Ed. Engl., 2018, 57, 7898-7902.  "Nahinfrarot‐sensibilisierte photoinduzierte ATRP mit einer Kupfer(II)‐Katalysatorkonzentration im ppm‐Bereich" Angew. Chem., 2018, 130, 8025-8030. Selected as HOT paper by the editor.

[6] Z. Chen, D. Oprych, C. Xie, C. Kutahya, S. Wu, B. Strehmel, "Upconversion-Nanoparticle-Assisted Radical Polymerization at λ=974 nm and the Generation of Acidic Cations" ChemPhotoChem 2017, 1, 499-503. Selected from Angewandte Chemie as Top Contribution from our Sister Journals.

[7] C. Schmitz, B. Strehmel, "Photochemical Treatment of Powder Coatings and VOC-Free Coatings with NIR Lasers Exhibiting Line-Shaped Focus: Physical and Chemical Solidification" ChemPhotoChem 2017, 1, 26-34.

[8] C. Schmitz, A. Halbhuber, D. Keil, B. Strehmel, "NIR-Sensitized Photoinitiated Radical Polymerization and Proton Generation with Cyanines and LED Arrays" Progress in Organic Coatings 2016, 100, 32-46.

[9] C. Schmitz, B. Gökce, J. Jakobi, S. Barcikowski, B. Strehmel, "Integration of Gold Nanoparticles into NIR-Radiation Curable Powder Resin" ChemistrySelect 2016, 1, 5574-5578.

[10] T. Brömme, C. Schmitz, N. Moszner, P. Burtscher, N. Strehmel, B. Strehmel, "Photochemical Oxidation of NIR Photosensitizers in the Presence of Radical Initiators and Their Prospective Use in Dental Applications" ChemistrySelect 2016, 1, 524-532. Belongs to the 10 most cited papers from ChemistrySelect in 2016

[11] T. Brömme, C. Schmitz, D. Oprych, A. Wenda, V. Strehmel, M. Grabolle, U. Resch-Genger, S. Ernst, K. Reiner, D. Keil, P. Lüs, H. Baumann, B. Strehmel, "Digital Imaging of Lithographic Materials by Radical Photopolymerization and Photonic Baking with NIR Diode Lasers" Chem. Eng. Technol. 2016, 39, 13-25.



Review - Book Chapter - Book

[1] C. Schmitz, D. Oprych, C. Kutahya, B. Strehmel, NIR Light for Initiation of Photopolymerization, in Photopolymerisation Initiating Systems (Eds.: J. Lalevée, J.-P. Fouassier), Royal Society of Chemistry, 2018, pp. 431-478.

[2] B. Strehmel, C. Schmitz, T. Brömme, A. Halbhuber, D. Oprych, J. S. Gutmann, "Advances of Near Infrared Sensitized Radical and Cationic Photopolymerization: from Graphic Industry to Traditional Coatings" Journal of Photopolymer Science and Technology 2016, 29, 111-121.

[3] T. Brock, M. Groteklaes, P. Mischke, B. Strehmel, Lehrbuch der Lacktechnologie, 5. Auflage, 2016, Vincentz Network.

[4] B. Strehmel, T. Brömme, C. Schmitz, K. Reiner, S. Ernst, D. Keil, NIR-Dyes for Photopolymers and Laser Drying in the Graphic Industry, in Dyes and Chromophores in Polymer Science, Eds.: J.-P. Fouassier, J. Laleveé, John Wiley & Sons, Inc., 2015, pp. 213-249.

[5] B. Strehmel, S. Ernst, K. Reiner, D. Keil, H. Lindauer, H. Baumann, "Application of NIR-Photopolymers in the Graphic Industry: From Physical Chemistry to Lithographic Applications" Z. Phys. Chem. 2014, 228, 129-153.

Funded Projects

  • 2017-2020 (Ministerium für Kultur und Wissenschaft des Landes NRW, Programm "FH Zeit für Forschung"): REFUBELAS: Reversibel funktionalisierte Oberflächenbeschichtungen mit NIR Linienfokus-Lasern und NIR-LEDs, Projektleiter: Prof. Dr. B. Strehmel
  • 2018-2020 (BMWi): Charakterisierung und Anwendungstests von kratzfesten neuen Nanolacken, Projektleiter: Prof. Dr. B. Strehmel
  • 2016-2019 (BMWi): Entwicklung von isocyanatfreien wässrigen Polyurethanlacken zum Beschichten von Parketten und elastischen Bodenbelägen; wässrige Dispersionen von isocyanatfreien Polyurethanbindemitteln, Projektleiter: Prof. Dr. B. Strehmel
  • 2016-2017 (DFG): Hexaarylbisimidazole zur Funktionalisierung und Selbstheilung von Oberflächen mit NIR Lasern und NIR-LEDs, Projektnummer 318930685, Projektleiter: Prof. Dr. B. Strehmel, Projektakademie Ingenieurwissenschaften
  • 2014-2017 (BMBF): FHprofUnt 2014: MoMaDruDig (Moderne Materialien für den ultraschnellen Druck im digitalen Zeitalter), Projektleiter: Prof. Dr. B. Strehmel und Prof. Dr. V. Strehmel
  • 2012-2015 (BMWi): Photoinitiatoren für Ressourcen und energieschonende Polymeriationstechniken, Projektleiter: Prof. Dr. B. Strehmel


more details: ORCID:


2018-now: Chair of the Fachgruppe Photochemie of the German Chemical Society (GDCh)

2017-now: Cahir of the Institute for Coatings and Surface Technology at Niederrgein University of Applied Sciences

2016-now: Member of the review board of the DFG (406-4: Structuring and Functionalization)

2014-now: Chair of the Ortsverband Krefeld of the German Chemical Society (GDCh)

2014-now: Member of the Fachbereichsrat of the Chemistry Department at Niederrhein University of Applied Sciences


2003: Habilitation in Physical Chemistry at Humboldt University of Berlin

1988: Dr. rer. nat. (equiv. with PhD outside of Germany) at former Technical University of Merseburg


Habilitation Fellowship of the DFG

DAAD Fellowship

Humboldt fellowship for research at technical University of Berlin in 1992 and 1992

Professional Development

2011-now: Professor of Coating Chemistry and New Materials, Niederrhein University of Applied Sciences

2003-2011: Research Chemist, Kodak Graphic Communication GmbH

2000-2003: Staff for research and education, University of Potsdam

1999-2000: Research Scientist, University of Applied Sciences Merseburg

1998-1999: Senior Scientist, Bowling Green State University, USA

1994-1998: Habilitation Fellow of the DFG, Humboldt University of Berlin

1993-1994: Research Scientist at Technical University of Berlin

1993-1994: DAAD Fellow, Stanford University, USA

19982-1992: Technical University of Merseburg



for more details see: ORCID:

Our research focusses on the use of light for different applications for solidifications of coatings. Photoinitiatiators covering the UV, visible and NIR range belong to our most investigated targets.

LEDs and NIR lasers have been the most employed light sources in our projects to cure coatings.

In addition, new functionalized monomers and binders have been additional interesting fields in our research.

Both, research with focus on fundamentals of photopolymerization and applied aspects of photopolymerization have been key fields in our research.

Our Team in the Lab

Dennis Oprych, M.Eng.
Doktorand / Betreuer an der HN: Prof. Dr. Bernd Strehmel Mitglied ILOC-Institut
Yulian Pang, M.Sc.
Doktorandin / Betreuer an der HN: Prof. Dr. Bernd Strehmel Mitglied ILOC-Institut
Qunying Wang, M.Eng.
Doktorandin / Betreuer an der HN: Prof. Dr. Bernd Strehmel Mitglied ILOC-Institut
Paul Jonas Hermes, M.Eng.
Doktorand / Betreuer an der HN: Prof. Dr. Bernd Strehmel
Lukas Appelhoff, M. Eng.
Doktorand / Betreuer an der HN: Prof. Dr. Bernd Strehmel Mitglied ILOC-Institut


Lackchemie und Neue Materialien ILOC-Institutsleiter


Info für Studierende

Frühjahrssemester 2021


Alle Lehrveranstaltungen werden ONLINE stattfinden.

Inhouse Abschlussarbeiten

Warum woanders hingehen, wenn man im Lacklabor beste Betreuung erhalten kann. 

Prinzipiell ist es bei uns möglich, Abschlussarbeiten Inhouse durchzufühen. Das garantiert eine optimale Betreuung und die Möglichkeit moderne Methoden (z. B. NMR Spektroskopie, GPC, Viskosimetrie, Elementaranalyse, Ultraschall) einzusetzen. Weiterhin besteht die Möglichkeit zur Nutzung der Infrastruktur des ILOC. Ausgewählte Themen können auch in Zusammenarbeit mit dem HIT der Hochschule Niederrhein sowie mit den Kooperationspartnern bearbeitet werden.

Das kann zu folgenden Themen erfolgen, welche einen starken Bezug zur Forschung haben:

- kontrollierte maßgeschneiderte Synthese von polymeren Bindemitteln

- polymere Netzwerke

- Synthese und Charakterisierung von neuen Monomeren und Präpolymere für Lackanwendungen

- Licht als kleinstes Reagenz und Werkzeug


Monomere und Polymere (Vorlesung, Seminar, Praktikum)


Modul Grüne Chemie

Technische Photochemie






Folgende Lehrveranstaltungen werden von mir angeboten:


Modul Lackchemie 1 (Modulverantwortlicher)

Bindemittel (Vorlesung, Seminar, Praktikum)


Chemische Verfahrenstechnik 1 (Modulverantwortlicher)

Werkstoffkunde  (Vorlesung, Seminar, Praktikum)

Versuch 1

Versuch 2

Versuch 3


Wissenschaftliches Arbeiten

Wissenschaftliches Arbeiten (Vorlesung)