MoS<sub>2</sub> nanoflower-decorated lignin nanoparticles for superior lubricant properties

Lindenbeck, Lucie Marie; Beele, Björn B.; Morsali, Mohammad; Budnyk, Serhiy; Frauscher, Marcella; Chen, Jianhong; Sipponen, Mika H.; Slabon, Adam; Rodrigues, Bruno V. M.

doi:10.1039/d3nr00458a

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Benzaldehyde (5) which should be the product of C-C bond cleavage of (2), was also identified both in 1 H NMR (Figure S3, peaks at 10 ppm, 8.0 ppm, 7.5 ppm) and LC-HRMS (Figure S5). A possible route for benzoic acid (8) observed in LC-HRMS might be the following: 1 reacts with atmospheric oxygen to form the peroxy radical (6). 6 subsequently abstracts protons from water molecules present in the solvent to generate hydroperoxide (7) which is attacked by H + (coming from HBr), and transformed to benzoic acid (8) and phenol (4).…”

Section: Resultsmentioning

confidence: 99%

“…2 Lignocellulosic biomass has received significant interest in recent years due to its potential application as second generation biofuels and CO2-neutral renewable feedstock for platform chemicals and materials. [3][4][5][6] Lignin, being one of the three main constituents of the plant cell walls is the largest available biomass of aromatic compounds. 7 However, it is a great challenge to produce monomers from natural or technical lignins due to their extremely complex, three-dimensional and cross-linked structure formed mainly by the radical coupling reactions of monolignols which are phydroxyphenyl (H), guaiacyl (G), and syringyl (S) units (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

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Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Kaya

Atsay

Gündüz

et al. 2023

Preprint

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The development of sustainable valorization methods for lignin is a challenging task, because the vast majority of the reported methods require either harsh conditions or the use of expensive transition metal catalysts. Inspired from the natural-sunlight degradation of lignin, known as lignin yellowing, we report here the use of a commercially available cheap organic photocatalyst, namely, phenacyl bromide (PAB), for the efficient cleavage of lignin model compound 2-phenoxyacetophenone (2-PAP), and the depolymerization of soda pulped lignin (SL) under UV-A irradiation under ambient conditions. Real-time NMR investigations of the photoreaction between the model compound and PAB shed light on the possible reaction mechanisms involving different radical species, HBr, and molecular oxygen. Interestingly, combined spectral, chromatographic, powder X-ray diffraction and thermal studies of the photocatalytic reaction between PAB and SL indicated the formation of guaiacyl alcohol. The unprecedented catalytic performance of such a simple organic photocatalyst is attributed to the generation of phenacyl radicals, photolabile brominated species and HBr playing key roles in the cleavage of β-O-4 linkages. This study represents a new edge for lignin valorization under mild reaction conditions and offers the opportunity for large-scale environment-neutral production of valuable aromatics using technical lignins as feedstock.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Kaya

Atsay

Gündüz

et al. 2023

Preprint

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Improving the Strain Control Performance of MoS₂ Monolayer to Develop Flexible Electronics

Chen,

Qiu,

Babichuk

et al. 2023

Adv Eng Mater

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In recent years, two‐dimensional (2D) materials with unique mechanical, optical, and electrical properties have attracted extensive attention. In terms of mechanical properties, 2D molybdenum disulfide (MoS2) can perform larger strains than traditional semiconductor materials. In this contribution, we used the chemical vapor deposition (CVD) technique to grow MoS2 films on a Si wafer and transfer them onto a flexible substrate. The controlled deformation of 2D MoS2 samples was realized by encapsulating them with a flexible acrylate film via successive spin‐coating and photopolymerization. Improved strain control was achieved due to the perfect integration of different components (MoS2/substrate) and the high adhesion of polymers. This approach provided a better detection of the changing structure of the MoS2 monolayer on the flexible substrate during tensile. It is noted that the crystal symmetry damage caused by strain is reflected in the redshift of the characteristic bands of MoS2. Hence, we provided an effective way for strain regulation of MoS2 for future applications in flexible devices.This article is protected by copyright. All rights reserved.

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Nature‐Inspired Depolymerization of Soda Lignin: Light‐Induced Free Radical Promoted Cleavage of β‐O‐4 Bonds

Kaya,

Atsay,

Gunduz

et al. 2023

Advanced Sustainable Systems

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The development of sustainable valorization methods for lignin is a challenging task because the vast majority of the reported studies involve either harsh conditions or expensive transition metal catalysts. Inspired by the sunlight degradation of lignin compounds, known as lignin yellowing, the use of a commercially available cheap organic photoinitiator, namely, phenacyl bromide (PAB) is reported here, for the efficient cleavage of lignin model compound 2‐phenoxyacetophenone (2‐PAP) and for the depolymerization of soda pulped lignin (SL) under UV‐A irradiation and ambient conditions. Real‐time NMR investigations of the photoreaction between 2‐PAP and PAB shed light on the possible reaction mechanisms involving different radical species, HBr, and molecular oxygen. Interestingly, combined spectral, chromatographic, powder X‐ray diffraction, and thermal studies of the photoreaction between PAB and SL indicate the formation of guaiacyl alcohol as the main product. The unprecedented performance of PAB is attributed to the excess generation of phenacyl radicals, the generation of photolabile brominated species, and HBr playing key roles in the cleavage of β‐O‐4 linkages. This work represents a new edge for sustainable lignin valorization under mild reaction conditions and offers the opportunity for large‐scale production of valuable aromatics using technical lignins as feedstock.

show abstract

MoS₂ nanoflower-decorated lignin nanoparticles for superior lubricant properties

Abstract: Lignin has been for long treated as a low-value waste product. To change this scenario, high-value applications have been recently pursued, e.g., the preparation of hybrid materials with inorganic components....

Cited by 4 publications

References 41 publications

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Improving the Strain Control Performance of MoS₂ Monolayer to Develop Flexible Electronics

Nature‐Inspired Depolymerization of Soda Lignin: Light‐Induced Free Radical Promoted Cleavage of β‐O‐4 Bonds

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MoS2 nanoflower-decorated lignin nanoparticles for superior lubricant properties

Abstract: Lignin has been for long treated as a low-value waste product. To change this scenario, high-value applications have been recently pursued, e.g., the preparation of hybrid materials with inorganic components....

Cited by 4 publications

References 41 publications

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Improving the Strain Control Performance of MoS2 Monolayer to Develop Flexible Electronics

Nature‐Inspired Depolymerization of Soda Lignin: Light‐Induced Free Radical Promoted Cleavage of β‐O‐4 Bonds

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Product

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MoS₂ nanoflower-decorated lignin nanoparticles for superior lubricant properties

Improving the Strain Control Performance of MoS₂ Monolayer to Develop Flexible Electronics