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Chamorro-Coral W, Caillard A, Brault P, Baranton S, Coutanceau C. Binary and ternary Pt-based clusters grown in a plasma multimagnetron-based gas aggregation source: electrocatalytic evaluation towards glycerol oxidation. Nanoscale Adv 2021; 3:1730-1740. [PMID: 36132561 PMCID: PMC9418899 DOI: 10.1039/d0na01009j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/19/2021] [Indexed: 06/15/2023]
Abstract
Platinum (Pt), platinum-bismuth (PtBi), platinum-copper (PtCu) and platinum-bismuth-copper (PtCuBi) clusters were grown in a gas aggregation source (GAS) equipped with three in-plane plasma magnetrons located in a single region of the gas aggregation zone. The X-ray diffraction results have shown that PtCu clusters form alloys as the decrease of the lattice parameter occurs when the Cu atomic content increases. PtBi clusters do not form alloys, but the presence of secondary Bi oxide phases was detected. Scanning transmission electron microscope mapping images revealed that simultaneously adding Bi and Cu to Pt leads to PtCu alloyed clusters decorated with Bi or CuBi species on the surface. The electrochemical results indicated that the shell might be composed of a metastable CuBi phase. Electrochemical measurements have shown that the addition of Bi or Cu to the Pt clusters enhances the catalytic activity for glycerol oxidation by decreasing the oxidation onset potential.
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Affiliation(s)
- W Chamorro-Coral
- Groupe de Recherches sur l'Energétique des Milieux Ionisés (GREMI), Université d'Orléans, CNRS 14 rue d'Issoudun BP6744 45067 Orléans cedex 2 France
| | - A Caillard
- Groupe de Recherches sur l'Energétique des Milieux Ionisés (GREMI), Université d'Orléans, CNRS 14 rue d'Issoudun BP6744 45067 Orléans cedex 2 France
| | - P Brault
- Groupe de Recherches sur l'Energétique des Milieux Ionisés (GREMI), Université d'Orléans, CNRS 14 rue d'Issoudun BP6744 45067 Orléans cedex 2 France
| | - S Baranton
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS 4 rue Michel Brunet TSA 51106 86073 Poitiers cedex 9 France
| | - C Coutanceau
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS 4 rue Michel Brunet TSA 51106 86073 Poitiers cedex 9 France
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Caillard A, Gayat E, Tantot A, Dubreuil G, M'Bakulu E, Madadaki C, Bart F, Bresson D, Froelich S, Mebazaa A, Vallée F. Comparison of cardiac output measured by oesophageal Doppler ultrasonography or pulse pressure contour wave analysis. Br J Anaesth 2015; 114:893-900. [PMID: 25735709 DOI: 10.1093/bja/aev001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2014] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Maintaining adequate organ perfusion during high-risk surgery requires continuous monitoring of cardiac output to optimise haemodynamics. Oesophageal Doppler Cardiac Output monitoring (DCO) is commonly used in this context, but has some limitations. Recently, the cardiac output estimated by pulse pressure analysis- (PPCO) was developed. This study evaluated the agreement of cardiac output variations estimated with 9 non-commercial algorithms of PPCO compared with those obtained with DCO. METHODS High-risk patients undergoing neurosurgery were monitored with invasive blood pressure and DCO. For each patient, 9 PPCO algorithms and DCO were recorded before and at the peak effect for every haemodynamic challenge. RESULTS Sixty-two subjects were enrolled; 284 events were recorded, including 134 volume expansions and 150 vasopressor boluses. Among the 9 algorithms tested, the Liljestrand-Zander model led to the smallest bias (0.03 litre min(-1) [-1.31, +1.38] (0.21 litre min(-1) [-1.13; 1.54] after volume expansion and -0.13 litre min(-1) [-1.41, 1.15] after vasopressor use). The corresponding percentage of the concordance was 91% (86% after volume expansion and 94% after vasopressor use). The other algorithms, especially those using the Winkessel concept and the area under the pressure wave, were profoundly affected by the vasopressor. CONCLUSIONS Among the 9 PPCO algorithms examined, the Liljestrand-Zander model demonstrated the least bias and best limits of agreement, especially after vasopressor use. Using this particular algorithm in association with DCO calibration could represent a valuable option for continuous cardiac output monitoring of high risk patients. CLINICAL TRIAL REGISTRATION Comité d'éthique de la Société de Réanimation de Langue Française No. 11-356.
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Affiliation(s)
- A Caillard
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France INSERM UMR-942, Paris, France
| | - E Gayat
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France INSERM UMR-942, Paris, France
| | - A Tantot
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France INSERM UMR-942, Paris, France
| | - G Dubreuil
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France
| | - E M'Bakulu
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France
| | - C Madadaki
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France
| | - F Bart
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France
| | - D Bresson
- University Paris Diderot, Paris, France Department of Neurosurgery, Hôpitaux Universitaires St-Louis-Lariboisière, Paris, France
| | - S Froelich
- University Paris Diderot, Paris, France Department of Neurosurgery, Hôpitaux Universitaires St-Louis-Lariboisière, Paris, France
| | - A Mebazaa
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France INSERM UMR-942, Paris, France
| | - F Vallée
- Department of Anesthesiology and Critical Care, Hôpitaux Universitaires St-Louis-Lariboisière-Fernand Widal, Paris, France University Paris Diderot, Paris, France
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Caillard A, Vodovar N, Sadoune S, Meddour M, Mebazaa A, Li Z, Samuel JL. P756Invalidation of mouse QSOX1: consequences upon acute heart failure. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu098.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Caillard A, Dubreuil G, M’Bakulu E, Tantot A, Bart F, Gayat E, Madadaki C, Vallée F, Mebazaa A. Comparaison du débit cardiaque mesuré par Doppler œsophagien et par 9 algorithmes d’analyse du contour de l’onde de pouls au cours d’épreuves thérapeutiques. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.annfar.2013.07.723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Brault P, Caillard A, Baranton S, Mougenot M, Cuynet S, Coutanceau C. One-step synthesis and chemical characterization of Pt-C nanowire composites by plasma sputtering. ChemSusChem 2013; 6:1168-1171. [PMID: 23765573 DOI: 10.1002/cssc.201300236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Indexed: 06/02/2023]
Abstract
Plasma increases activity: A one-step synthesis of Pt-C nanowire composites using a plasma co-deposition method is reported. Electrodes with a very low Pt loading can be obtained. Pt particles with sizes ranging from 1 to 2 nm are decorating the columnar carbon nanostructures because of strong interactions. The composite microstructure is responsible for a very high metal utilization rate as exemplified by reactions occurring in fuel cell electrodes.
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Affiliation(s)
- Pascal Brault
- Groupe de Recherches sur l'Energétique des Milieux Ionisés (GREMI), Université d'Orléans, UMR CNRS 7344, Orléans, France
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Brault P, Josserand C, Bauchire JM, Caillard A, Charles C, Boswell RW. Anomalous diffusion mediated by atom deposition into a porous substrate. Phys Rev Lett 2009; 102:045901. [PMID: 19257443 DOI: 10.1103/physrevlett.102.045901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Indexed: 05/27/2023]
Abstract
Constant flux atom deposition into a porous medium is shown to generate a dense overlayer and a diffusion profile. Scaling analysis shows that the overlayer acts as a dynamic control for atomic diffusion in the porous substrate. This is modeled by generalizing the porous diffusion equation with a time-dependent diffusion coefficient equivalent to a nonlinear rescaling of time.
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Affiliation(s)
- Pascal Brault
- Groupe de Recherches sur l'Energétique des Milieux Ionisés, UMR6606, Université d'Orléans, France
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