Low-temperature intermediates to oxygen reduction reaction catalysts based on amine-modified metal-loaded carbons. An XPS and ss-NMR investigation

Marzorati, Stefania; Ragg, Enzio; Longhi, Mariangela; Formaro, L.

doi:10.1016/j.matchemphys.2015.05.063

Cited by 24 publications

(14 citation statements)

References 74 publications

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“…The N 1s and Si 2p peaks are presented in Figure b and the corresponding elemental relative concentrations are shown in the table embedded in Figure . Regarding nitrogen, Marzorati et al have reported binding energies for terminal amines between 398.4 and 398.8 eV, for secondary or tertiary amines between 400.0 and 400.5 eV, and in the case of intra- or intermolecular bonding, binding energies between 402.0 and 403.0 eV . These three peaks can be distinguished in the N 1s spectrum of Figure b.…”

Section: Resultsmentioning

confidence: 92%

“…An X-ray photoelectron spectroscopy (XPS) analysis was performed in order to obtain have reported binding energies for terminal amines between 398.4 and 398.8 eV, for secondary or tertiary amines between 400.0 and 400.5 eV and in the case of intra-or inter-molecular bonding a binding energy between 402.0 and 403.0 eV. 54 These three peaks can be distinguished in the N1s spectrum of Fig. 5b.…”

Section: Resultsmentioning

confidence: 99%

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Antibacterial Cellulose Nanopapers via Aminosilane Grafting in Supercritical Carbon Dioxide

Darpentigny

Sillard

Menneteau

et al. 2020

ACS Appl. Bio Mater.

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In this work, we present an innovative strategy for the grafting of an antibacterial agent onto nanocellulose materials in supercritical carbon dioxide (scCO 2 ). Dense cellulose nanofibril (CNF) nanopapers were prepared and subsequently functionalized in supercritical carbon dioxide with an aminosilane, N-(6-aminohexyl)aminopropyltrimethoxysilane (AHA-P-TMS). Surface characterization (X-ray photoelectron spectroscopy, contact angle, zeta potential analysis) evidenced the presence of the aminosilane. Results show that the silane conformation depends on the curing process: a non-polycondensed conformation of grafted silane with the amino groups facing outwards was favored by curing in an oven while the curing step performed 2 in scCO 2 yielded CNF structures with the alkyl chain facing outwards. The grafted nanopapers exhibited antibacterial activity and no antibacterial agent was released into the media. Furthermore, these materials proved to benefit from a low cytotoxicity. This study offers a proof of concept for the covalent grafting of active species on nanocellulose structures and the control of aminosilane orientation using a green and controlled approach. These newly designed materials could be used for their antibacterial activity in the biomedical field. Thus, perspectives for topical administration and design of wound dressing could be envisaged.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Antibacterial Cellulose Nanopapers via Aminosilane Grafting in Supercritical Carbon Dioxide

Darpentigny

Sillard

Menneteau

et al. 2020

ACS Appl. Bio Mater.

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“…Quantitative XPS demonstrated that the O/C atomic ratio of P75-reduced biochar (0.27) was lower than that in P75 biochar (0.40), which indicated that P75-reduced biochar was more reduced than P75 biochar (Figure S4). The C 1s XPS spectra revealed the prominent peaks, i.e., C–C, C–O, and CO groups, with binding energies of ∼284.8, ∼286.0, and ∼288.3 eV, respectively, in P75 biochar. ,, In contrast, there were only C–C and C–O groups in P75-reduced biochar, with binding energies of 284.8 and 286.2 eV, respectively. Moreover, the O 1s XPS spectra also confirmed that the CO group was present only in P75 biochar (Figure D) .…”

Section: Results and Discussionmentioning

confidence: 98%

Revealing the Mechanism of Biochar Enhancing the Production of Medium Chain Fatty Acids from Waste Activated Sludge Alkaline Fermentation Liquor

Wei

et al. 2021

ACS EST Water

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In this work, the effectiveness of biochar with distinctively different particle sizes (i.e., 2000−5000 and 75−150 μm) derived from anaerobically digested sludge was comprehensively evaluated in the production of enhancing MCFAs (medium chain fatty acids) using waste activated sludge alkaline fermentation liquor as feedstock with ethanol as the electron donor. The results showed that fine biochar (i.e., 75−150 μm) was more favorable for enhancing the production of MCFAs with an increased electron transfer efficiency reaching 92.6%. Metagenomic analysis revealed that the total microbial taxonomic composition shifted in favor of the production of MCFAs (e.g., Clostridium kluyveri sp., Clostridium magnum sp., and Clostridium botulinum sp.). The increased relative abundance of functional enzymes associated with the production of MCFAs confirmed that both the reverse β-oxidation pathway and the fatty acid biosynthesis pathway were enhanced by biochar. Mechanistic studies revealed that the biochar had high redoxactive properties due to the functional groups (mainly quinones and hydroquinone) on its surface and an important ability to charge and/or discharge, which thus promoted the transfer of electrons for the production of MCFAs during the CE process.

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“…Nevertheless, as time increases, the amount of Fe 2+ gradually increasing while the Fe 3+ decreased. We attributed this iron reduction to the presence of the amide bond with the EDC-NHS, thus the nitrogen gradually displaces the Fe 3+ to Fe 2+ (Additional file 1 : Figure S2A and B) [ 60 ]. In the Additional file the evolution of compositions for Fe 3 O 4 NPs and Fe 3 O 4 –EDC-NHS-NPs for 30 days after synthesis is summarized (Additional file 1 : Figure S2A).…”

Section: Resultsmentioning

confidence: 99%

Isolation of exosomes from whole blood by a new microfluidic device: proof of concept application in the diagnosis and monitoring of pancreatic cancer

et al. 2020

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Background Exosomes are endocytic-extracellular vesicles with a diameter around 100 nm that play an essential role on the communication between cells. In fact, they have been proposed as candidates for the diagnosis and the monitoring of different pathologies (such as Parkinson, Alzheimer, diabetes, cardiac damage, infection diseases or cancer). Results In this study, magnetic nanoparticles (Fe3O4NPs) were successfully functionalized with an exosome-binding antibody (anti-CD9) to mediate the magnetic capture in a microdevice. This was carried out under flow in a 1.6 mm (outer diameter) microchannel whose wall was in contact with a set of NdFeB permanent magnets, giving a high magnetic field across the channel diameter that allowed exosome separation with a high yield. To show the usefulness of the method, the direct capture of exosomes from whole blood of patients with pancreatic cancer (PC) was performed, as a proof of concept. The captured exosomes were then subjected to analysis of CA19-9, a protein often used to monitor PC patients. Conclusions Here, we describe a new microfluidic device and the procedure for the isolation of exosomes from whole blood, without any need of previous isolation steps, thereby facilitating translation to the clinic. The results show that, for the cases analyzed, the evaluation of CA19-9 in exosomes was highly sensitive, compared to serum samples.

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Low-temperature intermediates to oxygen reduction reaction catalysts based on amine-modified metal-loaded carbons. An XPS and ss-NMR investigation

Cited by 24 publications

References 74 publications

Antibacterial Cellulose Nanopapers via Aminosilane Grafting in Supercritical Carbon Dioxide

Antibacterial Cellulose Nanopapers via Aminosilane Grafting in Supercritical Carbon Dioxide

Revealing the Mechanism of Biochar Enhancing the Production of Medium Chain Fatty Acids from Waste Activated Sludge Alkaline Fermentation Liquor

Isolation of exosomes from whole blood by a new microfluidic device: proof of concept application in the diagnosis and monitoring of pancreatic cancer

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