Search results for: Jean-Yves Hihn

Items from 1 to 20 out of 25 results

article

Alkanethiol self-assembling on gold: Influence of high frequency ultrasound on adsorption kinetics and electrochemical blocking

Florian Roy, Abdeslam Et Taouil, Fabrice Lallemand, Olivier Heintz, more

Ultrasonics Sonochemistry > 2018 > 40 > PB > 9-16

Self-assembling of undecanthiol (C11SH) on polycrystalline gold was investigated under two different conditions. The kinetics of C11SH grafting was studied without and under high frequency ultrasound irradiation. Two electrochemical experiments were extensively carried out in order to determine electrochemical surface blocking of adsorbed layers as a function of grafting time: chronoamperometry in-situ...

article

Effect of ultrasound on silver electrodeposition: Crystalline structure modification

Aymeric Nevers, Loïc Hallez, Francis Touyeras, Jean-Yves Hihn

Ultrasonics Sonochemistry > 2018 > 40 > PB > 60-71

An attractive possibility for influencing microstructures of electrodeposited coatings, and therefore their properties such as hardness, brightness etc. resides in the use of ultrasound. This method is particularly competitive as it may result in a reduction of chemical use, or even in the complete suppression of chemicals. This paper deals with silver coatings depending strongly on current density,...

article

An ultrasonic-assisted process for copper recovery in a des solvent: Leaching and re-deposition

Marie-Laure Doche, Audrey Mandroyan, Mahmoud Mourad-Mahmoud, Virginie Moutarlier, more

Chemical Engineering and Processing: Process Intensification > 2017 > 121 > C > 90-96

The continuous growth of the electronic equipment market has led to an increased amount of scraping that it becomes necessary to recover. A hydrometallurgical method for copper and precious metal recovery from e-waste must consist of a number of steps: leaching, ion separation and subsequent electrochemical re-deposition of the target metal. Although this task is achievable in aqueous solutions, it...

article

Use of sinusoidal voltages with fixed frequency in the preparation of tyrosinase based electrochemical biosensors for dopamine electroanalysis

Cecilia Lete, Boris Lakard, Jean-Yves Hihn, Francisco Javier del Campo, more

Sensors and Actuators B: Chemical > 2017 > 240 > C > 801-809

Sinusoidal voltages (SV) of fixed frequency were used in the preparation of electrochemical biosensors based on gold (Au) disk microelectrode arrays (MEAs) modified with a bio-composite material consisting of poly(3,4-ethylenedioxythiophene) conducting polymer (PEDOT) and tyrosinase (Tyr). The SV was applied over a d.c. potential of 0.60V vs. Ag/AgCl/KCl (3M) in order to assess the contribution of...

article

Investigation of pharmaceutically active ionic liquids as electrolyte for the electrosynthesis of polypyrrole and active component in controlled drug delivery

Stéphanie Carquigny, Boris Lakard, Sophie Lakard, Virginie Moutarlier, more

Electrochimica Acta > 2016 > 211 > C > 950-961

Ionic liquids containing pharmaceutically active ingredients (API-ILs) have been used to electrosynthesize polypyrrole (PPy) films. Two different cations have been investigated, imidazolium and cholinium, respectively. These cations have been paired with saccharinate, acesulfamate and ibuprofenate anions. Growth of polypyrrole films in neat imidazolium API-ILs, which are liquid at room temperature,...

article

Enhancement and quenching of high-intensity focused ultrasound cavitation activity via short frequency sweep gaps

Loïc Hallez, Judy Lee, Francis Touyeras, Aymeric Nevers, more

Ultrasonics Sonochemistry > 2016 > 29 > C > 194-197

This letter reports on the use of frequency sweeps to probe acoustic cavitation activity generated by high-intensity focused ultrasound (HIFU). Unprecedented enhancement and quenching of HIFU cavitation activity were observed when short frequency sweep gaps were applied in negative and positive directions, respectively. It was revealed that irrespective of the frequency gap, it is the direction and...

article

Influence of modification time and high frequency ultrasound irradiation on self-assembling of alkylphosphonic acids on stainless steel: Electrochemical and spectroscopic studies

Florian Roy, Abdeslam Et Taouil, Fabrice Lallemand, Jean-Marie Melot, more

Ultrasonics - Sonochemistry > 2016 > 28 > Complete > 269-275

Self-assembly of alkylphosphonic acids on stainless steel was investigated under different conditions. Four different alkylphosphonic acids exhibiting alkyl chain of various size were synthesized and studied: butylphosphonic acid (C4P), octylphosphonic acid (C8P), decylphosphonic acid (C10P), and hexadecylphosphonic acid (C16P). Electrochemistry experiments were extensively carried out in order to...

article

Characterization of the activity of ultrasound emitted in a perpendicular liquid flow using Particle Image Velocimetry (PIV) and electrochemical mass transfer measurements

Magali Barthès, Gerald Mazue, Dimitri Bonnet, Remy Viennet, more

Ultrasonics > 2015 > 59 > Complete > 72-78

The present work is dedicated to the study of the interactions between a liquid circulation and a perpendicular acoustic wave propagation. A specific experimental setup was designed to study one transducer operating at 20kHz, with the help of electrochemical mass transfer measurements combined with Particle Image Velocimetry (PIV) determination. Electrodes were located on the wall opposite to the...

article

Multi-analyte determination of dopamine and catechol at single-walled carbon nanotubes – Conducting polymer – Tyrosinase based electrochemical biosensors

Cecilia Lete, Stelian Lupu, Boris Lakard, Jean-Yves Hihn, more

Journal of Electroanalytical Chemistry > 2015 > 744 > Complete > 53-61

Simultaneous electrochemical determination of dopamine and catechol was achieved at gold (Au) disk microelectrode arrays (MEAs) and interdigitated microband electrode arrays (IDEs), modified with a bio-composite material consisting of single-walled carbon nanotubes (CNT), functionalized with carboxylic groups, poly(3,4-ethylenedioxythiophene) (PEDOT), and tyrosinase (Ty). The bio-composite material...

article

Influence of a perpendicular liquid flow on a cleaning process using 20 kHz ultrasound: Characterization of the agitation at vicinity of the surface opposite to the transducer

Gérald Mazue, Rémy Viennet, Jean‐Yves Hihn, Dimitri Bonnet, more

The Canadian Journal of Chemical Engineering > 93 > 2 > 201 - 205

This work is part of a project consisting of the development of an automatic cleaning station for the immersed part of boats. This self‐service station combines ultrasound for washing with a specific water treatment. Since, in this case, displacement of the transducers plus suction of the dirt removed induce circulation, we need to measure the ultrasound activity which reaches the surface despite...

article

Effects of ultrasound and temperature on copper electro reduction in Deep Eutectic Solvents (DES)

Audrey Mandroyan, Mahmoud Mourad-Mahmoud, Marie-Laure Doche, Jean-Yves Hihn

Ultrasonics Sonochemistry > 2014 > 21 > 6 > 2010-2019

This paper concerns a preliminary study for a new copper recovery process from ionic solvent. The aim of this work is to study the reduction of copper in Deep Eutectic Solvent (choline chloride–ethylene glycol) and to compare the influence of temperature and the ultrasound effects on kinetic parameters. Solutions were prepared by dissolution of chloride copper salt CuCl₂ (to obtain Copper in oxidation...

article

Adsorption of gelatin during electrodeposition of copper and tin–copper alloys from acid sulfate electrolyte

Charline Meudre, Laurence Ricq, Jean-Yves Hihn, Virginie Moutarlier, more

Surface & Coatings Technology > 2014 > 252 > Complete > 93-101

An acid Cu–Sn deposition bath was developed, and copper and copper–tin coatings were electrodeposited on polycrystalline platinum. The effect of gelatin on copper and copper–tin electrodeposition from acid sulfate solutions has been investigated by a variety of electrochemical methods (voltammetric studies and electrochemical quartz crystal microbalance) as well as by morphologic technique (scanning...

article

Effects of high frequency ultrasound irradiation on doping level and electroactivity of conducting polymers: Influence of OH• radicals

Abdeslam Et Taouil, Fabrice Lallemand, Jean-Yves Hihn, Loïc Hallez, more

Polymer Degradation and Stability > 2013 > 98 > 8 > 1413-1418

Chemical effects of ultrasound on conducting polymers were studied, especially the effects of OH• radicals. In spite of OH• radicals formation by ultrasound, electroactivity of sonicated films is not degraded. That was explained by the too low concentration of these active species generated in irradiated media. These same radical species are, for the first time, claimed to be at the origin of the...

article

In situ electrodeposition of biocomposite materials by sinusoidal voltages on microelectrodes array for tyrosinase based amperometric biosensor development

Stelian Lupu, Cecilia Lete, Paul Cǎtǎlin Balaure, Francisco Javier del Campo, more

Sensors & Actuators: B. Chemical > 2013 > 181 > Complete > 136-143

The amperometric detection of dopamine (DA) and catechol (CT) was achieved at tyrosinase (Ty)-poly(3,4-ethylenedioxythiophene) (PEDOT) bio-composite film-modified gold (Au) disc microelectrode arrays. The PEDOT-Ty bio-composite coatings were prepared by electrochemical polymerization of the corresponding monomer 3,4-ethylenedioxythiophene (EDOT) in the presence of various amounts of Ty on Au microelectrode...

article

Corrosion protection by sonoelectrodeposited organic films on zinc coated steel

Abdeslam Et Taouil, Mahmoud Mourad Mahmoud, Fabrice Lallemand, Séverine Lallemand, more

Ultrasonics - Sonochemistry > 2012 > 19 > 6 > 1186-1193

A variety of coatings based on electrosynthesized polypyrrole were deposited on zinc coated steel in presence or absence of ultrasound, and studied in terms of corrosion protection. Cr III and Cr VI commercial passivation were used as references. Depth profiling showed a homogeneous deposit for Cr III, while SEM imaging revealed good surface homogeneity for Cr VI layers. These chromium-based passivations...

article

Novel in situ electrochemical deposition of platinum nanoparticles by sinusoidal voltages on conducting polymer films

Stelian Lupu, Boris Lakard, Jean-Yves Hihn, Jérôme Dejeu

Synthetic Metals > 2012 > 162 > 1-2 > 193-198

Platinum (Pt) nanoparticles were successfully electrodeposited in situ on an organic conductive polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), using for the first time sinusoidal voltages of various frequencies in a chloroplatinic acid solution. The organic PEDOT matrix was electrodeposited on Pt electrode chips. The Pt electrode chips consist of a 150nm Pt layer deposited on 100-oriented standard...

article

Relation between structure and ions mobility in polypyrrole electrosynthesized under high frequency ultrasound irradiation

Abdeslam Et Taouil, Fabrice Lallemand, Jean-Yves Hihn, Loïc Hallez, more

Electrochimica Acta > 2011 > 58 > Complete > 67-75

High frequency ultrasound (500kHz) was shown to have very interesting effects on PPy elaborated with various counter-ions: perchlorate (ClO ₄ ⁻ ), p-toluenesulfonate (TS ⁻ ) and molybdate (MoO ₄ ²⁻ ). Changes in polymer growth for sonicated films were highlighted by Atomic Force Microscopy (AFM) while Scanning Electron Microscopy (SEM) showed thinner and more homogeneous...

article

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

Stelian Lupu, Boris Lakard, Jean-Yves Hihn, Jérôme Dejeu, more

Thin Solid Films > 2011 > 519 > 22 > 7754-7762

Electrochemical in situ preparation and morphological characterization of inorganic redox material-organic conducting polymer coatings as thin films on platinum electrodes are presented. Composite inorganic–organic coatings consist of Prussian blue (PB) and [poly(3,4-ethylenedioxythiophene)] (PEDOT), and PEDOT organic polymers doped with ferricyanide (PEDOT–FeCN). The PEDOT coating deposited from...

article

Microtribological and corrosion behaviors of 1H,1H,2H,2H-perfluorodecanethiol self-assembled films on copper surfaces

Tilia Patois, Abdeslam Et Taouil, Fabrice Lallemand, Luc Carpentier, more

Surface & Coatings Technology > 2010 > 205 > 7 > 2511-2517

Fluoroorganic monolayers adsorped on copper are studied in terms of organization, structure, electrochemical behavior, corrosion and tribological properties. 1H,1H,2H,2H-perfluorodecanethiol thin films are grafted on copper via a self-assembling process. PM-IRRAS and XPS were used to investigate the organization, composition and structural properties of the SAMs. Cyclic voltammetry studies revealed...

article

Adsorption of thiourea on polycrystalline platinum: Influence on electrodeposition of copper

Magali Quinet, Fabrice Lallemand, Laurence Ricq, Jean-Yves Hihn, more

Surface & Coatings Technology > 2010 > 204 > 20 > 3108-3117

Although previous works have shown the marked influence of thiourea as an organic additive in electrolyte bulk on copper electrodeposition, a variety of mechanisms could be responsible. The present paper concerns the effect of a thiourea layer adsorbed prior to copper electrodeposition. First evidence of a monolayer on platinum substrate was revealed by X-ray photoelectron spectroscopy. Two different...

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Search results for: Jean-Yves Hihn

Alkanethiol self-assembling on gold: Influence of high frequency ultrasound on adsorption kinetics and electrochemical blocking

Effect of ultrasound on silver electrodeposition: Crystalline structure modification

An ultrasonic-assisted process for copper recovery in a des solvent: Leaching and re-deposition

Use of sinusoidal voltages with fixed frequency in the preparation of tyrosinase based electrochemical biosensors for dopamine electroanalysis

Investigation of pharmaceutically active ionic liquids as electrolyte for the electrosynthesis of polypyrrole and active component in controlled drug delivery

Enhancement and quenching of high-intensity focused ultrasound cavitation activity via short frequency sweep gaps

Influence of modification time and high frequency ultrasound irradiation on self-assembling of alkylphosphonic acids on stainless steel: Electrochemical and spectroscopic studies

Characterization of the activity of ultrasound emitted in a perpendicular liquid flow using Particle Image Velocimetry (PIV) and electrochemical mass transfer measurements

Multi-analyte determination of dopamine and catechol at single-walled carbon nanotubes – Conducting polymer – Tyrosinase based electrochemical biosensors

Influence of a perpendicular liquid flow on a cleaning process using 20 kHz ultrasound: Characterization of the agitation at vicinity of the surface opposite to the transducer

Effects of ultrasound and temperature on copper electro reduction in Deep Eutectic Solvents (DES)

Adsorption of gelatin during electrodeposition of copper and tin–copper alloys from acid sulfate electrolyte

Effects of high frequency ultrasound irradiation on doping level and electroactivity of conducting polymers: Influence of OH• radicals

In situ electrodeposition of biocomposite materials by sinusoidal voltages on microelectrodes array for tyrosinase based amperometric biosensor development

Corrosion protection by sonoelectrodeposited organic films on zinc coated steel

Novel in situ electrochemical deposition of platinum nanoparticles by sinusoidal voltages on conducting polymer films

Relation between structure and ions mobility in polypyrrole electrosynthesized under high frequency ultrasound irradiation

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

Microtribological and corrosion behaviors of 1H,1H,2H,2H-perfluorodecanethiol self-assembled films on copper surfaces

Adsorption of thiourea on polycrystalline platinum: Influence on electrodeposition of copper

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