Carbon dots as green photocatalysts for atom transfer radical polymerization of methacrylates

Campalani, Carlotta; Bragato, Nicola; Morandini, Andrea; Selva, Maurizio; Fiorani, Giulia; Perosa, Alvise

doi:10.1016/j.cattod.2023.114039

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…The nitrogen‐doped carbon dots ( a ‐ N ‐ CDs ) examined in the present investigation have been synthesized through the hydrothermal treatment of an aqueous solution of citric acid and diethylenetriamine, as already reported elsewhere [27–30] . The presence of different organic functionalities on the surface of the carbon nanoparticles has been pointed out by means of FT‐IR spectroscopy analysis (Figures S1–S2 in the supporting information).…”

Section: Resultsmentioning

confidence: 93%

“…The nitrogen-doped carbon dots (a-N-CDs) examined in the present investigation have been synthesized through the hydrothermal treatment of an aqueous solution of citric acid and diethylenetriamine, as already reported elsewhere. [27][28][29][30] The presence of different organic functionalities on the surface of the carbon nanoparticles has been pointed out by means of FT-IR spectroscopy analysis (Figures S1-S2 in the supporting information). In particular, a broad band assigned to the presence of hydroxyl groups can be seen at 3400 cm À 1 , together with another peak at 3300-3000 cm À 1 , due to the stretching of NÀ H bonds and one at 3000-2800 cm À 1 , reasonably assigned to the presence of ammonium groups.…”

Section: Synthesis and Characterization Of Amorphous Nitrogen-doped C...mentioning

confidence: 99%

“…Synthesis of nitrogen-doped carbon dots (a-N-CDs). CDs employed in the present investigation were synthesized through hydrothermal treatment, by adapting a protocol already reported in literature [27][28][29][30]. An aqueous solution of citric acid (2 g in 20 mL of MilliQ water) and diethylenetriamine (0.67 g) was heated in a sealed autoclave for 6 h at 180 °C.…”

Section: Experimental Partmentioning

confidence: 99%

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Nitrogen‐doped Carbon Dots as Biobased Catalysts for Visible Light Driven 1,2‐Functionalization of Olefins through an Atom Transfer Radical Addition Process

Hamadamin,

Benazzi,

Campalani

et al. 2023

ChemCatChem

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Amorphous nitrogen‐doped carbon dots (a‐N‐CDs) have been obtained under hydrothermal conditions from citric acid and diethylenetriamine (DETA) as the carbon and nitrogen source, respectively. Such materials exhibit a significant absorption in the visible light region and have been successfully employed as photoredox catalyst under violet LED irradiation for the 1,2‐difunctionalization of olefins via an atom transfer radical addition (ATRA) process. The reported approach occurs smoothly under metal‐free conditions in an aqueous medium, showcasing the (yet not completely explored) applications of such bio‐derived carbon materials in organic synthesis.

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Section: Resultsmentioning

confidence: 93%

Section: Synthesis and Characterization Of Amorphous Nitrogen-doped C...mentioning

confidence: 99%

Section: Experimental Partmentioning

confidence: 99%

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Nitrogen‐doped Carbon Dots as Biobased Catalysts for Visible Light Driven 1,2‐Functionalization of Olefins through an Atom Transfer Radical Addition Process

Hamadamin,

Benazzi,

Campalani

et al. 2023

ChemCatChem

Self Cite

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“…Perosa and his colleagues synthesized N-CDs from citric acid and diethylenetriamine and employed them as an effective photocatalyst for photoATRP of MA using visible light. [26] Their study revealed that the reaction was highly efficient in a water-based solvent, especially in a water/methanol (1:1) solution. Additionally, the use of N-CDs facilitated the usage of a small amount of metal catalyst (1% mol based on the monomer).…”

Section: Photoatrp Catalyzed By Metal-free Qdsmentioning

confidence: 99%

“…[25] However, recent years have seen increased interest in using metal-free QDs photocatalysts due to their cost-eff-ectiveness, reduced metal contamination, and improved biocompatibility of polymer products. Several metal-free QDs, such as N-doped carbon dots (N-CDs) [12,[26][27][28][29][30] and silicon quantum dots (SiQDs) [7] have been explored as photocatalysts for photoATRP. Many monomers, such as methyl methacrylate (MMA), methyl acrylate (MA), n-butyl acrylate (BA), 2-hydroxyethyl acrylate (HEA), benzyl methacrylate (BzMA), styrene (St), butyl methacrylate (BMA), tert-butyl acrylate (tBA), dimethyl acrylamide (DMA) and ethylene glycol methyl ether methacrylate (EGMEA), have been successfully polymerized using QDs-based photoATRP to form well-defined polymers (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Recent Advances on Metal-Free Quantum Dots as Green Photocatalysts for Photoinduced Atom Transfer Radical Polymerization

2024

General Chemistry

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Visible-light mediated photoinduced reversible deactivation radical polymerization (RDRP) is a promising method for producing well-defined polymers; however, it typically requires metal-containing catalysts, which can be toxic and limit practical applications. Therefore, developing new RDRP techniques is crucial. One promising approach is visible-light mediated photoinduced atom transfer radical polymerization (photoATRP), which utilizes metal-free photocatalysts and eco-friendly light to catalyze polymerization. PhotoATRP offers more precise control over polymerization kinetics and can be performed in diverse solvents, including water, enhancing versatility and enabling the production of polymers with well-defined structures, low molecular weight distribution indexes, and controllable relative molecular weights. This minireview outlines recent advances on photoATRP using metal-free quantum dots (QDs) as photocatalysts. The research progress and influence factors for QDs-based photoATRP, as well as the mechanistic insights into the process, were discussed. Finally, we address the challenges and opportunities facing QDs-based photoATRP.

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Fish Scales for Wearable Patches: Tailoring Films Assembled From Fish Waste Gelatin, Carbon Dots and Chitin Nanocrystals

Segato,

Calmanti,

Gnoato

et al. 2024

Advanced Sustainable Systems

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The properties of gelatin and collagen extracted from fishery wastes, specifically from mullet (Mugil Cephalus) scales, are modified with the aim to achieve biocompatible films with tunable characteristics to design sustainable UV protection solutions in the healthcare sector. Different additives are used to the scope including plasticizers, cross‐linkers, surfactants and optical modifiers. Carbon dots (CDs) obtained from seabass (Dicentrarchus labrax) scales combined with polysorbate‐20 (PS) as a dispersant agent, enable the fabrication of materials capable of blocking UV radiation almost completely, a crucial feature for dermal contact applications. The addition of hydrophobic surfactants and crosslinkers as citric acid, chitosan and surface deacetylated chitin nanocrystals (CsNCs) allowed to modulate the water adsorption of the films in the range 3–30% and to reach a twofold and 4.5‐fold increase of tensile strength and elastic modulus, respectively, as compared to the neat gelatin film. Moreover, film thickness is shown to be another adjustable parameter to enhance optic, mechanical, and permeation properties: the higher the thickness, the greater the UV‐blocking properties, elongation‐at‐break and water vapor permeability, leading to films with attractive characteristics as wearable patches.

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Carbon dots as green photocatalysts for atom transfer radical polymerization of methacrylates

Cited by 8 publications

References 40 publications

Nitrogen‐doped Carbon Dots as Biobased Catalysts for Visible Light Driven 1,2‐Functionalization of Olefins through an Atom Transfer Radical Addition Process

Nitrogen‐doped Carbon Dots as Biobased Catalysts for Visible Light Driven 1,2‐Functionalization of Olefins through an Atom Transfer Radical Addition Process

Recent Advances on Metal-Free Quantum Dots as Green Photocatalysts for Photoinduced Atom Transfer Radical Polymerization

Fish Scales for Wearable Patches: Tailoring Films Assembled From Fish Waste Gelatin, Carbon Dots and Chitin Nanocrystals

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