Publications de Evgeny Smirnov

Ionosomes: Observation of Ionic Bilayer Water Clusters

Hubert Girault, Sunny Isaïe Maye, Pekka Eero Peljo, Evgeny Smirnov

Emulsification of immiscible two-phase fluids, i.e., one condensed phase dispersed homogeneously as tiny droplets in an outer continuous medium, plays a key role in medicine, food, chemical separations, cosmetics, fabrication of micro- and nanoparticles an ...

AMER CHEMICAL SOC2021

Solid electrochemical energy storage for aqueous redox flow batteries: The case of copper hexacyanoferrate

Hubert Girault, Grégoire Clément Gschwend, Pekka Eero Peljo, Danick Reynard, Evgeny Smirnov, Christopher Raymond Dennison, Elena Zanzola, Solène Cindy Gentil

All redox flow batteries suffer from low energy storage density in comparison with conventional Li-ion batteries. However, this issue can be mitigated by utilization of solid energy storage materials to enhance the energy storage capacity. In this paper we ...

2019

Effect of Chaotropes on the Transfer of Ions and Dyes across the Liquid–Liquid Interface

Hubert Girault, Grégoire Clément Gschwend, Pekka Eero Peljo, Evgeny Smirnov, Lucie Josette Renée Rivier, Elena Vladimirova

Chaotropes such as urea can break the structure of water, weakening the hydrophobic effect and reducing aggregation. Here, we investigated how the addition of urea affects the transfer of ions and cationic dyes across the interface between immiscible elect ...

2018

Gold Nanofilms at Liquid–Liquid Interfaces: An Emerging Platform for Redox Electrocatalysis, Nanoplasmonic Sensors, and Electrovariable Optics

Thomas James Stockmann, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov

The functionality of liquid–liquid interfaces formed between two immiscible electrolyte solutions (ITIES) can be markedly enhanced by modification with supramolecular assemblies or solid nanomaterials. The focus of this Review is recent progress involving ...

2018

Large-scale layer-by-layer inkjet printing of flexible iridium-oxide based pH sensors

Hubert Girault, Fernando Cortes Salazar, Andreas Stephan Lesch, Jonnathan Cesar Hidalgo Acosta, Evgeny Smirnov, Victor Costa Bassetto, Milica Jovic

2018

Gold Raspberry-Like Colloidosomes Prepared at the Water-Nitromethane Interface

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov

Here, we propose a simple shake-flask method to produce micron-size colloidosomes from a liquid-liquid interface functionalized with a gold nanoparticle film. A step-by-step extraction process of an organic phase partially miscible with water led to the fo ...

2018

Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports

Hubert Girault, Astrid Johana Olaya Avendano, Thomas James Stockmann, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov, Lucie Josette Renée Rivier

Redox electrocatalysis (catalysis of electron-transfer reactions by floating conductive particles) is discussed from the point-of-view of Fermi level equilibration, and an overall theoretical framework is given. Examples of redox electrocatalysis in soluti ...

2017

Electrovariable gold nanoparticle films at liquid–liquid interfaces: from redox electrocatalysis to Marangoni-shutters

Hubert Girault, Grégoire Clément Gschwend, Pekka Eero Peljo, Evgeny Smirnov

Control over the physical properties of nanoparticle assemblies at a liquid–liquid interface is a key technological advancement to realize the dream of smart electrovariable nanosystems. Electrified interfaces, such as the interface between two immiscible ...

Royal Society of Chemistry2017

Assemblies of gold nanoparticles at liquid-liquid interfaces : from liquid optics to electrocatalysis

Evgeny Smirnov

The interface between two immiscible liquids, i.e. oil and water, is an extremely attractive scaffold to self-assemble nanoparticles (NP) in arranged films. The liquid-liquid interfaces (LLIs) are defect-free and pristine by the nature, they are transparen ...

EPFL2017

Self-assembly and redox induced phase transfer of gold nanoparticles at the water-propylene carbonate interface

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov

Citrate-stabilized gold nanoparticles were found to spontaneously self-assemble into a lustrous film at a bare water–propylene carbonate interface after vigorous shaking, due to the extremely low interfacial tension. The presence of an electron donor, tetr ...

Royal Society of Chemistry2017

Heterogeneous versus homogeneous electron transfer reactions at liquid–liquid interfaces: The wrong question?

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov

Functionalization of a soft or liquid-liquid interface by a one gold nanoparticle thick “nanofilm” provides a conductive pathway to facilitate interfacial electron transfer from a lipophilic electron donor to a hydrophilic electron acceptor in a process kn ...

Elsevier Science Sa2016

Self-Healing Gold Mirrors and Filters at Liquid-Liquid Interfaces

Hubert Girault, Frédéric Gumy, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov

The optical and morphological properties of lustrous metal self-healing liquid-like nanofilms were systematically studied towards different applications (e.g., optical mirrors or filters). These nanofilms were formed by a one-step self-assembly methodology ...

Royal Soc Chemistry2016

Gold Nanofilm Redox Catalysis for Oxygen Reduction at Soft Interfaces

Hubert Girault, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov

Functionalization of a soft or liquid-liquid interface by a one gold nanoparticle thick “nanofilm” provides a conductive pathway to facilitate interfacial electron transfer from a lipophilic electron donor to a hydrophilic electron acceptor in a process kn ...

Elsevier2016

Interfacial Redox Catalysis on Gold Nanofilms at Soft Interfaces

Hubert Girault, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov

Soft or “liquid-liquid” interfaces were functionalized by half a monolayer of mirror-like nanofilms of gold nanoparticles using a precise interfacial microinjection method. The surface coverage of the nanofilm was characterized by ion transfer voltammetry. ...

Amer Chemical Soc2015

Charging and Discharging at the Nanoscale: Fermi Level Equilibration of Metallic Nanoparticles

Hubert Girault, Manuel Alejandro Méndez Agudelo, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Evgeny Smirnov

The redox properties of metallic nanoparticles are discussed, in particular the relationships between excess charge, size and the Fermi level of the electrons. The redox potentials are derived using simple electrostatic models to provide a straightforward ...

Royal Soc Chemistry2015

Ultrafast Population Dynamics of Surface-Active Dyes during Electrochemically Controlled Ion Transfer across a Liquid|Liquid Interface

Pierre-François Marie Brevet, Hubert Girault, Astrid Johana Olaya Avendano, Evgeny Smirnov

We present for the first time experimental measurements on the ultrafast population dynamics of the model surface-active dye methyl orange (MO) during its ion transfer across the water|1,2-dichloroethane interface by using time-resolved surface second harm ...

Amer Chemical Soc2014

Gold Metal Liquid-Like Droplets

Pierre-François Marie Brevet, Hubert Girault, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Dmitry Momotenko, Micheal Diarmaid Scanlon, Evgeny Smirnov

Simple methods to self-assemble coatings and films encompassing nanoparticles are highly desirable in many practical scenarios, yet scarcely any examples of simple, robust approaches to coat macroscopic droplets with continuous, thick (multilayer), reflect ...

Amer Chemical Soc2014