Publications de Carlos Manuel De Melo Pereira

Flash light synthesis of noble metal nanoparticles for electrochemical applications: silver, gold, and their alloys

Hubert Girault, Victor Costa Bassetto, Carlos Manuel De Melo Pereira

The synthesis of noble metal nanoparticles (i.e., silver and gold) for electrochemical applications has been widely studied using mainly wet synthesis chemical methods or electrochemical deposition methods. In this work, we propose a single-step flash phot ...

SPRINGER2020

Parylene C Coated Microelectrodes For Scanning Electrochemical Microscopy

Hubert Girault, Pekka Eero Peljo, Fernando Cortes Salazar, Haiqiang Deng, Carlos Manuel De Melo Pereira

Herein, we present a simple microelectrode preparation methodology consisting in coating a platinum wire or a carbon fiber with a thin insulating Parylene C film (e.g. 1–10 μm), to produce SECM probes with a small and constant probe RG (i.e. ratio between ...

Elsevier2013

Conductive Gold Nanoparticle Mirrors at Liquid/Liquid Interfaces

Hubert Girault, Frédéric Gumy, Fernando Cortes Salazar, Micheal Diarmaid Scanlon, Dmitry Momotenko, Véronique Amstutz, Haiqiang Deng, Carlos Manuel De Melo Pereira, Pingping Fang

Gold nanoparticle (Au NP) mirrors, that exhibit both high reflectance and electrical conductance, were self-assembled at a [heptane + 1,2-dichloroethane]/water liquid/liquid interface. The highest reflectance, as observed experimentally and confirmed by fi ...

Amer Chemical Soc2013

Differential capacitance of liquid/liquid interfaces of finite thicknesses: a finite element study

Hubert Girault, Dmitry Momotenko, Carlos Manuel De Melo Pereira

Finite element simulations were used to investigate the effect of a smooth variation of permittivity across a polarized liquid/liquid interface on the differential capacitance. The results show that a relative permittivity profile can account for the varia ...

Royal Soc Chemistry2012

Amperometric tape ion sensors for cadmium(II) ion analysis

Hubert Girault, Carlos Manuel De Melo Pereira

This paper describes a novel tape platform ion sensing methodology specific to the detection of cadmium(II) ions in aqueous solution based on assisted ion transfer reactions across a polarized water | organic gel micro-interface. The tape ion sensors were ...

2009

Immobilized pH Gradient Gel Cell To Study the pH Dependence of Drug Lipophilicity

Hubert Girault, Christophe Roussel, Carlos Manuel De Melo Pereira, Hoang-Trang Lam

An experimental setup to study the pH dependence of standard ion-transfer potentials at the water/NPOE interface is presented. The system is composed of a micro-hole generated by laser photoablation in a 12-μm polyethylene terephthalate film, the aqueous p ...

2006

Ag+ transfer across the water|1,2-dichloroethane interface facilitated by complex formation with tetraphenylborate derivatives

Hubert Girault, Carlos Manuel De Melo Pereira, Laure Tomaszewski

The assisted transfer of silver ion, Ag+, by complexation of Ag+ with the tetrakis(4-chlorophenyl)borate (TPBCl−) anion was studied at the interface between two immiscible electrolyte solutions (ITIES). The elucidation of the interfacial mechanisms employe ...

Elsevier2004

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