Biocompatible Au@Carbynoid/Pluronic-F127 nanocomposites synthesized by pulsed laser ablation assisted CO2 recycling

Rosso, Tommaso Del; Louro, Sônia R.W.; Deepak, Francis Leonard; Romani, Eric C.; Zaman, Quaid; Tahir,; Pandoli, Omar; Cremona, M.; Freire, F.L.; Beule, Pieter De; Pierre, T. De St.; Aucélio, Ricardo Q.; Mariotto, G.; Gemini-Piperni, Sara; Ribeiro, Ana R.; Landi, S. M.; Magalhães, Alviclér

doi:10.1016/j.apsusc.2018.02.007

Cited by 19 publications

(19 citation statements)

References 38 publications

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“…Figure 1(c) depicts a STEM image of the synthesized AgNPs obtained via transmission electron microscopy. Consistent with the results published in [60], the AgNPs have a log-normal distribution [50], with an average diameter of approximately 6.7 nm. We verified that even after three cycles of NPs synthesis because of the deposition of the nanomaterial onto the internal channel's wall and slow clogging of the microchannel, the reproducibility of the optical properties of the nanomaterial was compromised.…”

Section: Synthesis and Characterization Of Citrate-stabilized Agnpssupporting

confidence: 89%

“…In comparison with gaseous environments, only a very few studies report the ablation of a metallic thin film in water. PLA of metal targets in liquid environments is mainly used for synthesizing colloidal dispersion of NPs of highly variable materials [28,50,51]. In this framework, ablation of metallic thin films in water has a particular control on both the chemical nature and the size of the produced nanomaterials [52,53].…”

Section: Introductionmentioning

confidence: 99%

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Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

Tahir

Pandoli

Zaman³

et al. 2022

J. Phys. Commun.

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The synthesis of metal nanoparticles (NPs) using microfluidic reactors has become a major method for limiting reagent consumption and achieve a precise control of the morphological properties. Failure in realizing the reproducibility of the results is mostly associated with the accumulation of metallic nanostructures on the walls of the microfluidic devices, periodically removed by acid treatment. In this study, we show that ns-pulsed laser ablation (PLA) in water can be a safe, effective, and green method for the regeneration of clogged microfluidic reactors. The effect of the laser-pulse fluence on the removal of metallic nanostructures was studied for the first time on silver (Ag) thin films with a thickness of 50 nm deposited over SiO2 substrates, using 3-mercaptopropyl trimethoxysilane as a chemical adhesion layer. As point of novelty, the experimental results show that at low fluence (F < 0.1 J/cm2), ablation is principally caused by delamination of the thin film associated with the thermoelastic force while thermal processes inducing phase conversion of the metal dominate at higher fluence. Low-fluence regimes are better suited for the single-pulse removal of the nanomaterial, whereas in high F regimes, we observed melting and recondensation of the metal on the SiO2 surface so that multiple pulse interactions were necessary for complete ablation of the thin film. For the delamination and the phase transformation processes, the threshold fluences were 3.7 × 10−2 and 7.0 × 10−2 J/cm2, respectively. The experimental setup in the thermoelastic PLA regime was applied to unclog glass microfluidic devices used for synthesizing citrate-stabilized AgNPs. Using this simple and easily achievable laser-scanning experimental configuration, we demonstrated that PLA in water is a reliable and efficient technique, with results comparable to acidic treatment in terms of efficiency and time necessary for the complete removal of the Ag nanomaterial.

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Section: Synthesis and Characterization Of Citrate-stabilized Agnpssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

Tahir

Pandoli

Zaman³

et al. 2022

J. Phys. Commun.

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“…These properties open the way to design chemical artificial polyynes able to (i) interact with proteins; (ii) behave as pro-drug systems and (iii) join DNA-complexing substructures. Moreover, relevant clinical results have reached conjugating natural enediynes with monoclonal antibodies [ 21 ], while Del Rosso et al demonstrated the high biocompatibility of a carbenoid-gold (Au@Carbynoid) nanocomposite stabilized by using Pluronic F127 as well as its potentiality in photodynamic therapy and as drug delivery system [ 22 ]. These scientific results highlight the potentiality of hybrid linear carbon chains-gold (Au@LCC) nanocomposites in view of biomedicine applications.…”

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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“…Observing Figure b, we realize that while the bulk sensitivity of the MPTS-based devices is increased by about ∼ 2% after the SLG transfer ( S RI = 63.4 deg RIU –1 ), the FOM is instead reduced. In the few literature contributions available at the moment, the enhancement in the bulk S RI of the SLG Au is associated theoretically with the enhancement in the plasma frequency of the gold layer, because of the formation of the surface dipole distribution at the Au/SLG interface in the air, , similar to the case of special gold–carbon nanocomposites. , In the literature, the increase in the sensitivity depends on the number of graphene layers transferred over the metal thin film and the wavelength of the SPP and may be negligible at telecommunication wavelengths. ,, …”

Section: Discussionmentioning

confidence: 99%

Water Diffusion Effects at Gold–Graphene Interfaces Supporting Surface Plasmon Polaritons

et al. 2022

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We present a detailed investigation on the effects of water diffusion at the different interfaces of gold−graphene plasmonic sensors on the propagation of the supported surface plasmon polaritons (SPPs). The substrate/metal interfacial chemical reactions are investigated by monitoring the full width at half-maximum of the SPR reflectivity curve. Although protection by singlelayer graphene (SLG) grown by chemical vapor deposition inhibits the chemical reactions happening at the metal−dielectric interfaces, SPR experimental results confirm that water diffusion paths through the borders of graphene domains are still present into the plasmonic sensors. Density functional theory calculations show that the doping level of SLG after the transfer on gold as well as interfacial charge transfer can be tuned in the presence of water molecules. On these bases, we propose a simplified effective medium approach for heterogeneous metal−carbon interfaces, where the interaction between the surface atomic layers of the gold thin film, water molecules, and the SLG induces the creation of an extended charge density difference region crossing the Au/H 2 O/SLG/H 2 O heterointerface. The latter is modeled as an ultrathin effective medium with a thickness and extraordinary optical susceptivity and conductivity that are different from those of the free-standing graphene. In this context, the extraordinary refractive index and thickness of the graphene−gold effective medium are measured in the near-infrared on the low-damping SPR platforms by applying the two-medium SPR method. The results are coherent with graphene n-doping in water environment, showing that the optically excited electrons along the extraordinary axis have a substantial bonding character and that the enhancement of the sensitivity of the gold−graphene plasmonic sensors is not related to a shift in the plasma frequency of the metal layer but to the changes in the extraordinary polarizability of graphene. The research highlights the importance of the SLG−substrate and SLG−environment interactions in graphene-protected plasmonics and optoelectronics.

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Biocompatible Au@Carbynoid/Pluronic-F127 nanocomposites synthesized by pulsed laser ablation assisted CO2 recycling

Cited by 19 publications

References 38 publications

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

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

Water Diffusion Effects at Gold–Graphene Interfaces Supporting Surface Plasmon Polaritons

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Biocompatible Au@Carbynoid/Pluronic-F127 nanocomposites synthesized by pulsed laser ablation assisted CO2 recycling

Cited by 19 publications

References 38 publications

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO2 adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO2 adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

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

Water Diffusion Effects at Gold–Graphene Interfaces Supporting Surface Plasmon Polaritons

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Product

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Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles

Thermoelastic pulsed laser ablation of silver thin films with organic metal–SiO₂ adhesion layer in water: application to the sustainable regeneration of glass microfluidic reactors for silver nanoparticles