Search

Your search keyword '"Lecante, Pierre"' showing total 17 results
Start Over Author "Lecante, Pierre" Search Limiters Full Text
17 results on '"Lecante, Pierre"'

3. Ultrasmall manganese ferrites for in vivo catalase mimicking activity and multimodal bioimaging

Author

Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, La Caixa, Fundación BBVA, Ministerio de Economía, Industria y Competitividad (España), Région Nouvelle-Aquitaine, Ligue Nationale contre le Cancer (France), Instituto de Salud Carlos III, Fundación Pro CNIC, Ministerio de Economía y Competitividad (España), Carregal-Romero, Susana, Miguel-Coello, Ana Beatriz, Martínez-Parra, Lydia, Martí-Mateo, Yolanda, Hernansanz-Agustín, Pablo, Fernández-Afonso, Yilian, Plaza-García, Sandra, Gutiérrez, Lucía, Muñoz-Hernández, María del Mar, Carrillo-Romero, Juliana, Piñol-Cancer, Marina, Lecante, Pierre, Blasco-Iturri, Zuriñe, Fadón, Lucía, Almansa-García, Ana C., Möller, Marco, Otaegui, Dorleta, Enríquez, Jose Antonio, Groult, Hugo, Ruíz-Cabello, Jesús, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, La Caixa, Fundación BBVA, Ministerio de Economía, Industria y Competitividad (España), Région Nouvelle-Aquitaine, Ligue Nationale contre le Cancer (France), Instituto de Salud Carlos III, Fundación Pro CNIC, Ministerio de Economía y Competitividad (España), Carregal-Romero, Susana, Miguel-Coello, Ana Beatriz, Martínez-Parra, Lydia, Martí-Mateo, Yolanda, Hernansanz-Agustín, Pablo, Fernández-Afonso, Yilian, Plaza-García, Sandra, Gutiérrez, Lucía, Muñoz-Hernández, María del Mar, Carrillo-Romero, Juliana, Piñol-Cancer, Marina, Lecante, Pierre, Blasco-Iturri, Zuriñe, Fadón, Lucía, Almansa-García, Ana C., Möller, Marco, Otaegui, Dorleta, Enríquez, Jose Antonio, Groult, Hugo, and Ruíz-Cabello, Jesús

Abstract

Manganese ferrite nanoparticles display interesting features in bioimaging and catalytic therapies. They have been recently used in theranostics as contrast agents in magnetic resonance imaging (MRI), and as catalase-mimicking nanozymes for hypoxia alleviation. These promising applications encourage the development of novel synthetic procedures to enhance the bioimaging and catalytic properties of these nanomaterials simultaneously. Herein, a cost-efficient synthetic microwave method is developed to manufacture ultrasmall manganese ferrite nanoparticles as advanced multimodal contrast agents in MRI and positron emission tomography (PET), and improved nanozymes. Such a synthetic method allows doping ferrites with Mn in a wide stoichiometric range (MnxFe3-xO4, 0.1 ≤ x ≤ 2.4), affording a library of nanoparticles with different magnetic relaxivities and catalytic properties. These tuned magnetic properties give rise to either positive or dual-mode MRI contrast agents. On the other hand, higher levels of Mn doping enhance the catalytic efficiency of the resulting nanozymes. Finally, through their intracellular catalase-mimicking activity, these ultrasmall manganese ferrite nanoparticles induce an unprecedented tumor growth inhibition in a breast cancer murine model. All of these results show the robust characteristics of these nanoparticles for nanobiotechnological applications.

Published
2022

6. Novel nickel nanoparticles stabilized by imidazolium-amidinate ligands for selective hydrogenation of alkynes

Author

Universitat Politècnica de València. Departamento de Química - Departament de Química, European Commission, European Regional Development Fund, Universitat Politècnica de València, Université Toulouse III Paul Sabatier, Instituto de Tecnología Química UPV-CSIC, Instituto de Investigaciones Químicas US-CSIC, Ministerio de Ciencia, Innovación y Universidades, Ministerio de Economía, Industria y Competitividad, Centre National de la Recherche Scientifique, Francia, López-Vinasco, Angela M., Martínez-Prieto, Luis Miguel, Asensio, Juan M., Lecante, Pierre, Chaudret, Bruno, Cámpora, Juan, van Leeuwen, Piet W. N. M., Universitat Politècnica de València. Departamento de Química - Departament de Química, European Commission, European Regional Development Fund, Universitat Politècnica de València, Université Toulouse III Paul Sabatier, Instituto de Tecnología Química UPV-CSIC, Instituto de Investigaciones Químicas US-CSIC, Ministerio de Ciencia, Innovación y Universidades, Ministerio de Economía, Industria y Competitividad, Centre National de la Recherche Scientifique, Francia, López-Vinasco, Angela M., Martínez-Prieto, Luis Miguel, Asensio, Juan M., Lecante, Pierre, Chaudret, Bruno, Cámpora, Juan, and van Leeuwen, Piet W. N. M.

Abstract

[EN] The main challenge in the hydrogenation of alkynes into (E)- or (Z)-alkenes is to control the selective formation of the alkene, avoiding the over-reduction to the corresponding alkane. In addition, the preparation of recoverable and reusable catalysts is of high interest. In this work, we report novel nickel nanoparticles (Ni NPs) stabilized by three different imidazolium-amidinate ligands (ICy center dot(NCN)-N-(Ar); L1: Ar = p-tol, L2: Ar = p-anisyl and L3: Ar = p-ClC6H4). The as-prepared Ni NPs were fully characterized by (HR)-TEM, XRD, WASX, XPS and VSM. The nanocatalysts are active in the hydrogenation of various substrates. They present a remarkable selectivity in the hydrogenation of alkynes towards (Z)-alkenes, particularly in the hydrogenation of 3-hexyne into (Z)-3-hexene under mild reaction conditions (room temperature, 3% mol Ni and 1 bar H-2). The catalytic behaviour of Ni NPs was influenced by the electron donor/acceptor groups (-Me, -OMe, -Cl) in the N-aryl substituents of the amidinate moiety of the ligands. Due to the magnetic character of the Ni NPs, recycling experiments were successfully performed after decantation in the presence of an external magnet, which allowed us to recover and reuse these catalysts at least 3 times preserving both activity and chemoselectivity.

Published
2020

8. A new synthetic method toward bimetallic ruthenium platinum nanoparticles; composition induced structural changes

Author

Pan, Cheng, Dassenoy, Fabrice, Casanove, Marie-Jose, Philippot, Karine, Amiens, Catherine, Lecante, Pierre, Mosset, Alain, and Chaudret, Bruno

Subjects
Chemical reactions -- Observations, Nanotechnology -- Research, Platinum -- Research, Ruthenium -- Research, Chemicals, plastics and rubber industries
Abstract

Research is presented describing the reaction of Pt(dba)2 with Ru(COD)(COT) under dihydrogen with PVP present. The composition of the resultant bimetallic nanoparticles in relation to the concentration of the two complexes in the original solution is described.

Published
1999

11. Novel nickel nanoparticles stabilized by imidazolium-amidinate ligands for selective hydrogenation of alkynes

Author

Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Consejo Superior de Investigaciones Científicas (España), Agencia Estatal de Investigación (España), Centre National de la Recherche Scientifique (France), Université Toulouse III Paul Sabatier, López-Vinasco, Ángela M., Martínez-Prieto, Luis Miguel, Asensio, Juan M., Lecante, Pierre, Chaudret, Bruno, Cámpora, Juan, Leeuwen, P.W.N.M. van, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Consejo Superior de Investigaciones Científicas (España), Agencia Estatal de Investigación (España), Centre National de la Recherche Scientifique (France), Université Toulouse III Paul Sabatier, López-Vinasco, Ángela M., Martínez-Prieto, Luis Miguel, Asensio, Juan M., Lecante, Pierre, Chaudret, Bruno, Cámpora, Juan, and Leeuwen, P.W.N.M. van

Abstract

The main challenge in the hydrogenation of alkynes into (E)- or (Z)-alkenes is to control the selective formation of the alkene, avoiding the over-reduction to the corresponding alkane. In addition, the preparation of recoverable and reusable catalysts is of high interest. In this work, we report novel nickel nanoparticles (Ni NPs) stabilized by three different imidazolium-amidinate ligands (ICy·(Ar)NCN; L1: Ar = p-tol, L2: Ar = p-anisyl and L3: Ar = p-ClC6H4). The as-prepared Ni NPs were fully characterized by (HR)-TEM, XRD, WASX, XPS and VSM. The nanocatalysts are active in the hydrogenation of various substrates. They present a remarkable selectivity in the hydrogenation of alkynes towards (Z)-alkenes, particularly in the hydrogenation of 3-hexyne into (Z)-3-hexene under mild reaction conditions (room temperature, 3% mol Ni and 1 bar H2). The catalytic behaviour of Ni NPs was influenced by the electron donor/acceptor groups (¿Me, ¿OMe, ¿Cl) in the N-aryl substituents of the amidinate moiety of the ligands. Due to the magnetic character of the Ni NPs, recycling experiments were successfully performed after decantation in the presence of an external magnet, which allowed us to recover and reuse these catalysts at least 3 times preserving both activity and chemoselectivity.

Published
2019

13. Organometallic control at the nanoscale: a new, one-pot method to decorate a magnetic nanoparticle surface with noble metal atoms.

Author

Atamena, Nabil, Ciuculescu, Diana, Alcaraz, Gilles, Smekhova, Aletina, Wilhelm, Fabrice, Rogalev, Andrei, Chaudret, Bruno, Lecante, Pierre, Benfield, Robert E., Amiens, Catherine, Atamena, Nabil, Ciuculescu, Diana, Alcaraz, Gilles, Smekhova, Aletina, Wilhelm, Fabrice, Rogalev, Andrei, Chaudret, Bruno, Lecante, Pierre, Benfield, Robert E., and Amiens, Catherine

Abstract

A novel cascade of reactions is designed to control in situ the deposition of noble metal islands (e.g. Rh) on top of nanoparticles of a 3d metal (e.g. Fe, Co).

Published
2010

14. One-pot synthesis of core - Shell FeRh nanoparticles

Author

Ciuculescu, Diana, Amiens, Catherine, Respaud, Marc, Falqui, Andrea, Lecante, Pierre, Benfield, Robert E., Jiang, Linqin, Fauth, Kai, Chaudret, Bruno, Ciuculescu, Diana, Amiens, Catherine, Respaud, Marc, Falqui, Andrea, Lecante, Pierre, Benfield, Robert E., Jiang, Linqin, Fauth, Kai, and Chaudret, Bruno

Published
2007

17. Alloyed Pt 3 M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction.

Author

Louisia S, Thomas YRJ, Lecante P, Heitzmann M, Axet MR, Jacques PA, and Serp P

Abstract

Sulfur- (S-CNT) and nitrogen-doped (N-CNT) carbon nanotubes have been produced by catalytic chemical vapor deposition (c-CVD) and were subject to an annealing treatment. These CNTs were used as supports for small (≈2 nm) Pt 3 M (M = Co or Ni) alloyed nanoparticles that have a very homogeneous size distribution (in spite of the high metal loading of ≈40 wt % Pt), using an ionic liquid as a stabilizer. The electrochemical surface area, the activity for the oxygen reduction reaction and the amount of H 2 O 2 generated during the oxygen reduction reaction (ORR) have been evaluated in a rotating ring disk electrode experiment. The Pt 3 M/N-CNT catalysts revealed excellent electrochemical properties compared to a commercial Pt 3 Co/Vulcan XC-72 catalyst. The nature of the carbon support plays a key role in determining the properties of the metal nanoparticles, on the preparation of the catalytic layer, and on the electrocatalytic performance in the ORR. On N-CNT supports, the specific activity followed the expected order Pt 3 Co > Pt 3 Ni, whereas on the annealed N-CNT support, the order was reversed.

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results