Solvent-dependent termination, size and stability in polyynes synthesized <i>via</i> laser ablation in liquids

Peggiani, Sonia; Marabotti, Pietro; Lotti, R.; Facibeni, Anna; Serafini, Patrick; Milani, Alberto; Russo, Valeria; Bassi, Andrea; Casari, Carlo Spartaco

doi:10.1039/d0cp04132g

Cited by 21 publications

(75 citation statements)

References 54 publications

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“…Spectroscopic analyses confirm that the achieved LCCs are hydrogen capped sp hybridized carbon structures with alternating single and triple bonds [ 24 , 25 ], while Au NPs are spherical with an average size of 5 nm [ 25 , 26 ]. However, the poor colloidal stability of the obtained LCCs leads to reorganization phenomena via crosslinking reaction in sp

structures [ 27 ]. To overcome this limit, the employment of spacers at the end of an sp-carbon chain, such as the embedding of these carbon chains in solid matrices (PVA, SiO

, metal nanoparticles), is an efficient strategy that helps to avoid sample degradation [ 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Nano-Hybrid Au@LCCs Systems Displaying Anti-Inflammatory Activity

et al. 2022

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Gold nanoparticles (Au NPs) have received great attention owing to their biocompatible nature, environmental, and widespread biomedical applications. Au NPs are known as capable to regulate inflammatory responses in several tissues and organs; interestingly, lower toxicity in conjunction with anti-inflammatory effects was reported to occur with Au NPs treatment. Several variables drive this benefit-risk balance, including Au NPs physicochemical properties such as their morphology, surface chemistry, and charge. In our research we prepared hybrid Au@LCC nanocolloids by the Pulsed Laser Ablation, which emerged as a suitable chemically clean technique to produce ligand-free or functionalized nanomaterials, with tight control on their properties (product purity, crystal structure selectivity, particle size distribution). Here, for the first time to our knowledge, we have investigated the bioproperties of Au@LCCs. When tested in vitro on intestinal epithelial cells exposed to TNF-α, Au@LCCs sample at the ratio of 2.6:1 showed a significantly reduced TNF gene expression and induced antioxidant heme oxygenase-1 gene expression better than the 1:1 dispersion. Although deeper investigations are needed, these findings indicate that the functionalization with LCCs allows a better interaction of Au NPs with targets involved in the cell redox status and inflammatory signaling.

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structures [ 27 ]. To overcome this limit, the employment of spacers at the end of an sp-carbon chain, such as the embedding of these carbon chains in solid matrices (PVA, SiO

, metal nanoparticles), is an efficient strategy that helps to avoid sample degradation [ 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Nano-Hybrid Au@LCCs Systems Displaying Anti-Inflammatory Activity

et al. 2022

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“…Indeed, the presence of a liquid layer strongly confines the plasma plume compared to ablation experiments performed in vacuum or low-pressure gas atmosphere, reducing the area of target ablation to approximately the laser spot and increasing the temperature and pressure inside the plasma [21,34,39,40]. At the plasma-liquid interface, the high temperatures cause the degradation, ionization, and pyrolisis of the solvent molecules [34,[41][42][43]. During this process, highly reactive species (e.g.…”

Section: Fundamental Process Occuring During Plalmentioning

confidence: 99%

“…This elongation process, called polymerization, competes with the hydrogenation process that instead tends to terminate the chain with a hydrogen atom [60]. Moreover, in the case of a carbon-based target or powder, both the target and the solvent provide carbon atoms or radicals for the polymerization mechanism [42]. Indeed, the high temperatures reached by the plasma plume cause the atomization of the several atomic layers of the target surface and induces the degradation of the solvent promoting the release of carbon atoms and/or C n radicals [42,60,62,63].…”

Section: Mechanisms Of Formation Of Polyynes By Plalmentioning

confidence: 99%

“…Moreover, in the case of a carbon-based target or powder, both the target and the solvent provide carbon atoms or radicals for the polymerization mechanism [42]. Indeed, the high temperatures reached by the plasma plume cause the atomization of the several atomic layers of the target surface and induces the degradation of the solvent promoting the release of carbon atoms and/or C n radicals [42,60,62,63]. Concerning the hydrogenation process and assuming a target only made of carbon (e.g.…”

Section: Mechanisms Of Formation Of Polyynes By Plalmentioning

confidence: 99%

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Pulsed laser ablation in liquid of sp-carbon chains: Status and recent advances

Marabotti

Peggiani²,

Vidale³

et al. 2022

Chinese Phys. B

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This review provides a discussion of the current state of research on sp-carbon chains synthesized by pulsed laser ablation in liquid. In recent years, pulsed laser ablation in liquid (PLAL) has been widely employed for polyynes synthesis thanks to its flexibility with varying laser parameters, solvents, and targets. This allows the control of sp-carbon chains properties as yield, length, termination and stability. Although many reviews related to PLAL have been published, a comprehensive work reporting the current status and advances related to the synthesis of sp-carbon chains by PLAL is still missing. Here we first review the principle of PLAL and the mechanisms of formation of sp-carbon chains. Then we discuss the role of laser fluence (i.e. energy density), solvent, and target for sp-carbon chains synthesis. Lastly, we report the progress related to the prolonged stability of sp-carbon chains by PLAL encapsulated in polymeric matrices. This review will be a helpful guide for researchers interested in synthesizing sp-carbon chains by PLAL.

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“…49 Casari et al recently reported the detection of hydrogenterminated oligoynes as long as H-(CRC) 11 -H via pulsed laser ablation of a graphite target in acetonitrile or alcohol solvents. 50 For the controlled laboratory synthesis of longer oligoynes attention turned to attaching very bulky aryl end-groups to prevent intermolecular reactions. Hirsch et al characterised a (CRC) 10 oligoyne with dendron-substituted aryl end-groups.…”

Section: Highlights Of Oligoyne Synthesismentioning

confidence: 99%