Open Access publication

X. Luo, J. Wan, N. Meckbach, S. Li, V. Strehmel, Z. Chen, B. Strehmel, "Porphyrin Based Organic Network Comprising Sustainable Carbon Dots for Photopolymerization" Angewandte Chemie International Edition 2022, e202208180. https://doi.org/10.1002/anie.202208180, "Porphyrinbasiertes organisches Netzwerk bestehend aus nachhaltigen Kohlenstoffpunkten für die Photopolymerisation" Angewandte Chemie 2022, e202208180.

Q. Wang, S. Popov, A. Feilen, V. Strehmel, B. Strehmel, "Rationale Auswahl von Cyaninen zur Erzeugung von konjugierter Säure und freien Radikalen für die Photopolymerisation durch Belichtung bei 860 nm", Angewandte Chemie 2021, 133, 27059–27070,   https://doi.org/10.1002/ange.202108713, „Rational Selection of Cyanines to Generate Conjugate Acid and Free Radicals for Photopolymerization upon Exposure at 860 nm“, Angewandte Chemie International Edition 2021, 60, 26855-26865. https://doi.org/10.1002/anie.202108713

C. Kütahya, Y. Zhai, S. Li, S. Liu, J. Li, V. Strehmel, Z. Chen, B. Strehmel, "Verschiedene nachhaltige Kohlenstoffnanopunkte für die freie radika- lische Photopolymerisation, die Photo-ATRP und die Photo-CuACC Chemie" Angewandte Chemie 2021, 133, 11078-11087, https://doi.org/10.1002/ange.202015677, „Distinct Sustainable Carbon Nanodots Enable Free Radical Photopolymerization, Photo-ATRP and Photo-CuAAC Chemistry“, Angewandte Chemie International Edition 2021, 60, 10983-10991. https://doi.org/10.1002/anie.202015677

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“, Angewandte Chemie 2021, 133, 1486 – 1495. https://doi.org/10.1002/ange.202010746    „NIR-Sensitized Cationic and Hybrid Radical/Cationic Polymerization and Crosslinking“, Angewandte Chemie International Edition 2021, 60, 1465-1473. https://doi.org/10.1002/anie.202010746

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. https://doi.org/10.1002/ange.201912343 „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. https://doi.org/10.1002/anie.201912343. 

D. Oprych, B. Strehmel, „Mediated Generation of Conjugate Acid by UV and Blue Sensitizers with Upconversion Nanoparticles at 980 nm“, Chemistry – A European Journal 2021, 27, 4297-4301. https://doi.org/10.1002/chem.202005076

C. Kütahya, N. Meckbach, V. Strehmel, B. Strehmel, „Cyanines comprising barbiturate group facilitate NIR‐light assisted ATRP under anaerobic and aerobic conditions at two wavelengths using Fe(III) catalyst“, Journal of Polymer Science 2021, 59, 2023-2035. https://doi.org/10.1002/pol.20210273

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 Journal2020, 26, 10444-10451.

Y. Pang, S. Fan, Q. Wang, D. Oprych, A. Feilen, K. Reiner, D. Keil, Y. L. Slominsky, S. Popov, Y. Zou, B. Strehmel, „NIR-Sensitized Activated Photoreaction between Cyanines and Oxime Esters: Free-Radical Photopolymerization“, Angew Chem Int Ed Engl 2020, 59, 11440-11447.  https://doi.org/10.1002/anie.202004413

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 chemistry2020, 16, 415-444.

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. https://doi.org/10.1002/chem.201985661  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. https://doi.org/10.1002/chem.201985661

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. https://doi.org/10.1002/cptc.201900170

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. https://doi.org/10.1002/cptc.201900196. 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. https://doi.org/10.1002/cptc.201900251

Further selected articles

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 Coatings2020, 144, 105663.

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.https://doi.org/10.1002/anie.201813696 "Neue Hochleistungs-LEDs ermöglichen Photochemie für die Nahinfrarot-sensibilisierte radikalische und kationische Photopolymerisation" Angewandte Chemie 2019, 131, 4445-4450. https://doi.org/10.1002/ange.201813696 selected as VIP paper by the editor.

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. https://doi.org/10.1002/cptc.201900012

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

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. https://doi.org/10.1002/anie.201802964  "Nahinfrarot‐sensibilisierte photoinduzierte ATRP mit einer Kupfer(II)‐Katalysatorkonzentration im ppm‐Bereich" Angew. Chem., 2018, 130, 8025-8030. https://doi.org/10.1002/ange.201802964 

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.

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.

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.

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.

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. 

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.

T. Brömme, D. Oprych, J. Horst, P. S. Pinto, B. Strehmel, „New iodonium salts in NIR sensitized radical photopolymerization of multifunctional monomers“, RSC Advances 2015, 5, 69915-69924. https://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra12236h

S. Berdzinski, B. Strehmel, V. Strehmel, „Photogenerated lophyl radicals in 1-alkyl-3-vinylimidazolium bis(trifluoromethylsulfonyl)imides“, Photochemical & Photobiological Sciences 2015, 14, 714-725.

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.

S. Berdzinski, N. Strehmel, H. Lindauer, V. Strehmel, B. Strehmel, „Extended mechanistic aspects on photoinitiated polymerization of 1,6-hexanediol diacrylate by hexaarylbisimidazoles and heterocyclic mercapto compounds“, Photochemical & Photobiological Sciences 2014, 13, 789-798.

[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.

• 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: https://orcid.org/0000-0001-7830-5013

Responsibilities

2018-2021: Chair of the Fachgruppe Photochemie of the German Chemical Society (GDCh)

2017-now: Chair 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

Education

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

Fellowships

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: https://orcid.org/0000-0001-7830-5013

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.