Unexpected self-assembly of carbon dots during digital light processing 3D printing of vanillin Schiff-base resin

Liguori, Anna; González, Karla Itzel Garfias; Hakkarainen, Minna

doi:10.1016/j.polymer.2023.126252

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…As Figure a,b shows, the top surface morphology of the prepared loofah like composites before curing exhibited some fibrillar structures with the formation of sheets that were uniformly distributed. With higher concentration of CD, a greater number of fibrils was observed, which might correlate to self-assembly of CD, also observed in previous studies with CD containing resins . The participation of CD is supported by the higher amount of fibrils in MHEC-3CD compared with MHEC-1CD.…”

Section: Resultsmentioning

confidence: 99%

“…With higher concentration of CD, a greater number of fibrils was observed, which might correlate to self-assembly of CD, also observed in previous studies with CD containing resins. 44 The participation of CD is supported by the higher amount of fibrils in MHEC-3CD compared with MHEC-1CD. However, these fibrils might also be deduced to freeze-drying at −50 °C as similar surface morphology with fiber formation was also observed for freeze-dried poly(vinyl alcohol) (PVOH) hydrogels.…”

Section: Rheological Analysismentioning

confidence: 96%

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Light Processable Methacrylated Carbon Dot-Hydroxyethyl Cellulose Resins with Potential Applications from Dye Adsorption to Antibacterial Gels and Wet Wipes

Hazarika,

Srivastava,

Hakkarainen

2024

ACS Appl. Polym. Mater.

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Cellulose-derived materials could offer more sustainable alternatives for current single-use hygiene articles produced from nondegradable fossil-based polymers. We successfully fabricated light processable methacrylated carbon dot-hydroxyethyl cellulose resins and illustrated potential applications in dye adsorption, antibacterial gels, and wet wipes. Carbon dots were first produced by microwave-assisted hydrothermal carbonization and the oxidation of cellulose. The obtained carbon dots and hydroxyethyl cellulose were in situ methacrylated to composite resins, which could be cured to gels in a mold or processed to 3D structures with digital light processing 3D printing. The cured gels had an adequate gel content of 80–84% and high swelling degree up to 350% in binary mixtures of water and dimethyl sulfoxide. Furthermore, the gels were effective dye-adsorbents, and they retained some of the antibacterial properties of nonmodified hydroxyethyl cellulose as evaluated by the disc diffusion method. While the gels could still be recovered after 60 days of soil burial at room temperature, clear sign of degradation and opening of the cross-linked structure were observed by scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Finally, a potential wet wipe was fabricated by laminating the produced gel between two electrospun cellulose acetate mats.

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Section: Resultsmentioning

confidence: 99%

Section: Rheological Analysismentioning

confidence: 96%

Light Processable Methacrylated Carbon Dot-Hydroxyethyl Cellulose Resins with Potential Applications from Dye Adsorption to Antibacterial Gels and Wet Wipes

Hazarika,

Srivastava,

Hakkarainen

2024

ACS Appl. Polym. Mater.

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“…Interestingly, the introduction of carbon dots (CD) in methacrylated Schiff base resins before the digital light processing 3D printing had a profound impact on the mechanical and chemical recyclability of the resulting thermosets. 140 While a significant decrease in elastic modulus was observed for the Schiff base thermosets, the presence of CD importantly mitigated this phenomenon, resulting in an almost complete preservation of the original mechanical properties in both mechanically and chemically recycled thermosets. This outcome was attributed to the establishment of secondary interactions in the thermosets, highlighting the synergistic effect of dynamic covalent bonds and supramolecular chemistry in enhancing the recyclability.…”

Section: Polyester-iminesmentioning

confidence: 96%

“…The chemically recycled thermosets showed an elastic modulus comparable to the mechanically recycled films (342 MPa for the chemically recycled thermoset vs 316 MPa for the mechanically recycled thermoset). Interestingly, the introduction of carbon dots (CD) in methacrylated Schiff base resins before the digital light processing 3D printing had a profound impact on the mechanical and chemical recyclability of the resulting thermosets . While a significant decrease in elastic modulus was observed for the Schiff base thermosets, the presence of CD importantly mitigated this phenomenon, resulting in an almost complete preservation of the original mechanical properties in both mechanically and chemically recycled thermosets.…”

Section: Increasing Circularity By Double Dynamic Structuresmentioning

confidence: 99%