Growth of Silver Nanoclusters on Monolayer Nanoparticulate Titanium-oxo-alkoxy Coatings

Jia, Zixian; Amar, Mounir Ben; Brinza, Ovidiu; Astafiev, Artyom A.; Надточенко, В. А.; Evlyukhin, Andrey B.; Chichkov, Boris N.; Duten, Xavier; Kanaev, Andreï

doi:10.1021/jp303356y

Cited by 21 publications

(15 citation statements)

References 48 publications

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“…These fields and a large contact area between mitochondria and nanoparticles are responsible for strong enhancement of Raman scattering of cytochrome c in ETC of intact mitochondria. Our numerical model suggests that direct interactions between nanoparticles are not important 37 . Note that so far we did not take into account surface plasmon resonances (SPR) 38 39 .…”

Section: Discussionmentioning

confidence: 80%

Probing cytochrome c in living mitochondria with surface-enhanced Raman spectroscopy

Brazhe

Evlyukhin

Goodilin

et al. 2015

Sci Rep

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Selective study of the electron transport chain components in living mitochondria is essential for fundamental biophysical research and for the development of new medical diagnostic methods. However, many important details of inter-and intramembrane mitochondrial processes have remained in shadow due to the lack of non-invasive techniques. Here we suggest a novel label-free approach based on the surface-enhanced Raman spectroscopy (SERS) to monitor the redox state and conformation of cytochrome c in the electron transport chain in living mitochondria. We demonstrate that SERS spectra of living mitochondria placed on hierarchically structured silver-ring substrates provide exclusive information about cytochrome c behavior under modulation of inner mitochondrial membrane potential, proton gradient and the activity of ATP-synthetase. Mathematical simulation explains the observed enhancement of Raman scattering due to high concentration of electric nearfield and large contact area between mitochondria and nanostructured surfaces.Mitochondria are organelles of fundamental importance for cellular energy production, metabolic regulation, aging and cell survival under stress [1][2][3] . Normal function of mitochondria and their pathological changes, including production of reactive oxygen species (ROS), are heavily dependent on the redox state of the electron transport chain (ETC) cytochromes and cytochrome c in particular 4,5 . At present, most of the studies of isolated mitochondria and mitochondria in cells are performed by fluorescent microscopy, absorption spectroscopy and measurements of O 2 consumption 3,[6][7][8] . The fluorescent microscopy with small fluorescent dyes (rhodamin and MitoTracker-family, etc.) or fluorescent proteins (GFP, YFP, RFP) can provide general information about changes in the potential of the inner mitochondrial membrane (Δ Φ ), the mitochondrial volume, and the co-localization of certain mitochondrial components with a molecule of interest

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Section: Discussionmentioning

confidence: 80%

Probing cytochrome c in living mitochondria with surface-enhanced Raman spectroscopy

Brazhe

Evlyukhin

Goodilin

et al. 2015

Sci Rep

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“…where r AgNPs is the spherical radius of nanosilver (nm), σ Ag is the surface free energy of silver (1.4 × 10 -3 kJ⋅m -2 ) (Cai et al 1998, Plieth 1982, M Ag is the atomic weight of silver (107.87 g⋅mol -1 ) 180 (Aston 1935), and ρ Ag is silver density (10.49 × 10 6 g⋅m -3 ) (Khanna et al 2007). According to Equation 1, the smallest nanosilver or one silver atom (radius ~ 0.16 nm) (Jia et al 2012, Wang 182 and Mak 2003, Zhao and Mak 2004 would have a ΔG 0 f(AgNPs) value of approximately 180 kJ⋅mol -…”

Section: Components Of δG F(agnps) In Aquatic Environmentsmentioning

confidence: 99%

Silver nanoparticles in aquatic environments: Physiochemical behavior and antimicrobial mechanisms

2016

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Nanosilver (silver nanoparticles or AgNPs) has unique physiochemical properties and strong antimicrobial activities. This paper provides a comprehensive review of the physicochemical behavior (e.g., dissolution and aggregation) and antimicrobial mechanisms of nanosilver in aquatic environments. The inconsistency in calculating the Gibbs free energy of formation of nanosilver [ΔGf(AgNPs)] in aquatic environments highlights the research needed to carefully determine the thermodynamic stability of nanosilver. The dissolutive release of silver ion (Ag(+)) in the literature is often described using a pseudo-first-order kinetics, but the fit is generally poor. This paper proposes a two-stage model that could better predict silver ion release kinetics. The theoretical analysis suggests that nanosilver dissolution could occur under anoxic conditions and that nanosilver may be sulfidized to form silver sulfide (Ag2S) under strict anaerobic conditions, but more investigation with carefully-designed experiments is required to confirm the analysis. Although silver ion release is likely the main antimicrobial mechanism of nanosilver, the contributions of (ion-free) AgNPs and reactive oxygen species (ROS) generation to the overall toxicity of nanosilver must not be neglected. Several research directions are proposed to better understand the dissolution kinetics of nanosilver and its antimicrobial mechanisms under various aquatic environmental conditions.

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“…Silver nanoparticles deposition was performed following the method presented in a previous study [91]. In this same study, atomic force microscopy (AFM, Veeco, Munich, Germany), scanning electron microscopy (SEM, Supra 40 VP, Zeiss, France) and transmission electron microscopy (TEM, 200 kV JEM 2011, JEOL, France) measurements showing a homogeneous dispersion of silver nanoclusters on the TiO 2 monolayer can be found.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Plasma-Catalysis for Volatile Organic Compounds Decomposition: Complexity of the Reaction Pathways during Acetaldehyde Removal

2020

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Acetaldehyde removal was carried out using non-thermal plasma (NTP) at 150 J·L−1, and plasma-driven catalysis (PDC) using Ag/TiO2/SiO2, at three different input energies—70, 350 and 1150 J·L−1. For the experimental configuration used, the PDC process showed better results in acetaldehyde (CH3CHO) degradation. At the exit of the reactor, for both processes and for all the used energies, the same intermediates in CH3CHO decomposition were identified, except for acetone which was only produced in the PDC process. In order to contribute to a better understanding of the synergistic effect between the plasma and the catalyst, acetaldehyde/catalyst surface interactions were studied by diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS). These measurements showed that different species such as acetate, formate, methoxy, ethoxy and formaldehyde are present on the surface, once it has been in contact with the plasma. A reaction pathway for CH3CHO degradation is proposed taking into account all the identified compounds in both the gas phase and the catalyst surface. It is very likely that in CH3CHO degradation the presence of methanol, one of the intermediates, combined with oxygen activation by silver atoms on the surface, are key elements in the performance of the PDC process.

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Growth of Silver Nanoclusters on Monolayer Nanoparticulate Titanium-oxo-alkoxy Coatings

Cited by 21 publications

References 48 publications

Probing cytochrome c in living mitochondria with surface-enhanced Raman spectroscopy

Probing cytochrome c in living mitochondria with surface-enhanced Raman spectroscopy

Silver nanoparticles in aquatic environments: Physiochemical behavior and antimicrobial mechanisms

Plasma-Catalysis for Volatile Organic Compounds Decomposition: Complexity of the Reaction Pathways during Acetaldehyde Removal

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