A feasibility study on the deposition and in-situ modification of soda lignin by suspension plasma spraying

Johannes Seitz; Carsten Mai; Wolfgang Vi&#246;l; Christoph Gerhard; Robert K&#246;hler

doi:10.1016/j.jobab.2026.100277

Volume 11 Issue 4

Aug. 2026

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Johannes Seitz, Carsten Mai, Wolfgang Viöl, Christoph Gerhard, Robert Köhler. A feasibility study on the deposition and in-situ modification of soda lignin by suspension plasma spraying[J]. Journal of Bioresources and Bioproducts, 2026, 11(4): 100277. doi: 10.1016/j.jobab.2026.100277

Citation:

Johannes Seitz, Carsten Mai, Wolfgang Viöl, Christoph Gerhard, Robert Köhler. A feasibility study on the deposition and in-situ modification of soda lignin by suspension plasma spraying[J]. Journal of Bioresources and Bioproducts, 2026, 11(4): 100277. doi: 10.1016/j.jobab.2026.100277

Citation:

Johannes Seitz, Carsten Mai, Wolfgang Viöl, Christoph Gerhard, Robert Köhler. A feasibility study on the deposition and in-situ modification of soda lignin by suspension plasma spraying[J]. Journal of Bioresources and Bioproducts, 2026, 11(4): 100277. doi: 10.1016/j.jobab.2026.100277

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A feasibility study on the deposition and in-situ modification of soda lignin by suspension plasma spraying

doi: 10.1016/j.jobab.2026.100277

a Faculty of Engineering and Health, University of Applied Sciences and Arts, Göttingen 37085, Germany;
b Department of Wood Biology and Wood Products, University of Göttingen, Göttingen 37077, Germany;
c Fraunhofer Institute for Surface Engineering and Thin Films IST, Application Center for Plasma and Photonics, Göttingen 37085, Germany;
d Department of Physics, Politecnico di Milano, Milan 20133, Italy

Funds:

The authors are grateful for the financial support for this work by zukunft.niedersachsen, the joint science funding program of the Lower Saxony Ministry of Science and Culture and the Volkswagen Foundation.

Received Date: 2026-02-26
Accepted Date: 2026-06-17
Rev Recd Date: 2026-05-16

Available Online: 2026-09-01

Publish Date: 2026-08-01

Abstract

Abstract

In this study, low-energy suspension plasma spraying (LE-SPS) was introduced as a novel approach for the deposition and simultaneous plasma-induced chemical modification of soda lignin. A colloidal lignin particle suspension was deposited onto glass substrates using a modified plasma spraying system with radial suspension injection. Scanning electron microscopy revealed continuous and dense coatings with an average thickness of approximately 4 μm. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, and ¹H/¹³C nuclear magnetic resonance (NMR) spectroscopy analyses indicated substantial plasma-induced chemical restructuring. The coatings exhibited increased oxygen-containing functionalities, including carbonyl and carboxyl/ester-type contributions, together with changes in aromatic signals. These spectroscopic changes are consistent with oxidative modification of lignin and increased contributions from ether- and ester-like environments. Overall, the results demonstrated that LE-SPS enabled lignin deposition accompanied by chemical transformation into a chemically reorganized lignin-based coating without additional crosslinkers, catalysts, or organic solvents.
- Lignin,
- Fourier transform infrared,
- X-ray photoelectron,
- Nuclear magnetic resonance,
- Suspension plasma spraying,
- Biopolymer

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References(37)

References

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