Heim M., Wattanakit C., Reculusa S., Warakulwit C., Limtrakul J., Ravaine S., Kuhn A.,
Electroanalysis 2013, 25, 888-894.
Hierarchically ordered macro-mesoporous Pt films have been synthesized on gold microwires by filling the void space of a colloidal crystal template with mesoporous Pt through electrodepositing the metal in the presence of self-assembled surfactant molecules, followed by a dissolution of the template. The network of interconnected macro- and mesopores in the homogeneous films was characterized using microscopy (SEM, TEM) and electrochemical techniques. The active surface areas of the porous wires increased by more than three orders of magnitude compared to non-porous samples. These high surface-to-volume ratios resulted in a high electrocatalytic activity for methanol oxidation.
Surface Compaction Versus Stretching in Pickering Emulsions Stabilised by Microgels 
jeudi 7 novembre 2013 Schmitt V., Ravaine V.,Curr. Opin. Colloid Interface Sci. 2013, 18, 532–541. Review Colloidal gel particles called microgels have shown their ability to adsorb at an oil–water interface and stabilise emulsion named Pickering emulsions. Such particles are soft, deformable, and porous, and they can swell or contract under the action of an external stimulus. These specificities make them...
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Electrokinetic Assembly of One-Dimensional Nanoparticle Chains with Cucurbit[7]uril Controlled Subnanometer Junctions 
vendredi 1 novembre 2013 Husken N., Taylor R. W., Zigah D., Taveau J.-C., Lambert O., Scherman O. A., Baumberg J. J., Kuhn A.,Nano Lett. 2013, 13, 6016–6022. One-dimensional (1D) nanoparticle chains with defined nanojunctions are of strong interest due to their plasmonic and electronic properties. A strategy is presented for the assembly of 1D gold-nanoparticle chains with fixed and rigid cucurbit[n]uril-nanojunctions...
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Electrochemical Detection of Single Microbeads Manipulated by Optical Tweezers in the Vicinity of Ultramicroelectrodes 
mardi 10 septembre 2013 Suraniti E., Kanoufi F., Gosse C., Zhao X., Dimova R., Pouligny B., Sojic N.,Anal. Chem. 2013, 85, 8902–8909. Editors' Highlight ! Latex micrometric beads are manipulated by optical tweezers in the vicinity of an ultramicroelectrode (UME). They are optically trapped in solution and approached the electrode surface. After the electrochemical measurement, they are optically removed from the...
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Comprehensive Study of DNA Binding on Iron(II,III) Oxide Nanoparticles with a Positively Charged Polyamine Three-Dimensional Coating 
mardi 13 août 2013 Yiu H. H. P., Bouffier L., Boldrin P., Long J., Claridge J. B., Rosseinsky M. J.,Langmuir 2013, 29, 11354-11365. Iron (II,III) oxide Fe3O4 nanoparticles (25 and 50 nm NPs) are grafted with amine groups through silanization in order to generate a positively charged coating for binding negatively charged species including DNA molecules. The spatial nature of the coating changes from a...
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Capillary Electrophoresis as a Production Tool for Asymmetric Microhybrids 
mercredi 17 juillet 2013 Fattah Z., Garrigue P., Goudeau B., Lapeyre V., Kuhn A., Bouffier L.,Electrophoresis 2013, 34, 1985-1990. The site selective electrodeposition of silver metal onto a conducting object such as carbon microtubes (CMTs) in an electrolytic solution could be achieved by means of bipolar electrochemistry. Two half reactions are simultaneously carried out at both extremities of the CMT, which act as a...
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Development of Electrochemical Microsensors for the Monitoring of Mitochondrial Activities 
mardi 18 juin 2013 Vanhove E., Ben-Amor S., Charlot S., Colin D., Devin A., Rigoulet M., Sojic N., Sékli Belaïdi F., Launay J., Temple-Boyer P., Arbault S.,I.E.E.E., Proceedings of Transducers 2013, 1135-1138. (Pt-Pt-Ag/AgCl) electrochemical microcell arrays were realized using silicon-based microtechnologies. Integrated working platinum ultra-microelectrodes (UME) were characterized compared to standard...
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Bipolar Electrochemistry: From Materials Science to Motion and Beyond 
mercredi 29 mai 2013 Loget G., Zigah D., Bouffier L., Sojic N., Kuhn A.Acc. Chem. Res. 2013, 46, 2513-2523. Bipolar electrochemistry, a phenomenon which generates an asymmetric reactivity onthe surface of conductive objects in a wireless manner, is an important concept for many purposes, from analysis to materials science as well as for the generation of motion. Chemists have known the basic concept for a long time,...
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Photochemical Crosslinking of Hyaluronic Acid confined in Nanoemulsions: towards Nanogels with a Controlled Structure 
mardi 7 mai 2013 Messager L., Portecop N., Hachet E., Lapeyre V., Pignot-Paintrand I., Catargi B., Auzély-Velty R., Ravaine V.,J. Mater. Chem. B 2013, 1, 3369-3379. We present the preparation of nanogels made of hyaluronic acid (HA) with a well-controlled structure. To this end, HA precursors with polymerizable methacrylate groups (HA-MA) were confined within water-in-oil nanoemulsion droplets as nanoreactors...
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Monitoring Metabolic Responses of Single Mitochondria within PDMS Wells: Study of their Endogenous NADH Evolution 
vendredi 19 avril 2013 Suraniti E., Vajrala S. R., Goudeau B., Bottari S., Rigoulet M., Devin A., Sojic N., Arbault S.,Anal. Chem. 2013, 85, 5146-5152. It is now demonstrated that mitochondria individually function differently because of specific energetic needs in cell compartments but also because of the genetic heterogeneity within the mitochondrial pool-network of a cell. Consequently, understanding mitochondrial...
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Functionalization of Optical Nanotip Arrays with an Electrochemical Microcantilever for Multiplexed DNA Detection 
vendredi 12 avril 2013 Descamps E., Duroure N., Deiss F., Leichlé T., Adam C., Mailley P., Aït-Ikhlef A., Livache T., Nicu L., Sojic N.,Lab on a Chip 2013, 13, 2956-2962. Optical nanotip arrays fabricated on etched fiber bundles were functionalized with DNA spots. Such unconventional substrates (3D and non-planar) are difficult to pattern with standard microfabrication techniques but, using an electrochemical...
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Enhanced Electrogenerated Chemiluminescence in Thermo-Responsive Microgels 
vendredi 29 mars 2013 Pinaud F., Russo L., Pinet S., Gosse I., Ravaine V., Sojic N.,J. Am. Chem. Soc. 2013, 135, 5517-5520. The electrochemistry, photoluminescence and electrogenerated chemiluminescence of thermoresponsive redox microgels were investigated. For the first time, reversible ECL enhancement is demonstrated in stimuli-responsive 100-nm microgel particles. Such an unexpected amplification reached 2 orders...
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Introducing a well-ordered Volume Porosity in 3-Dimensional Gold Microcantilevers 
lundi 4 février 2013 Ayela C., Lalo H., Kuhn A.,Appl. Phys.Lett. 2013, 102, 053501. The purpose of the present work is the introduction of a combined bottom-up and top-down approach to generate 3-dimensional gold microcantilevers, where the porosity in the volume of the free-standing microstructure is well-controlled. By combining the elaboration of a colloidal crystal, followed by electrodeposition, with a...
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Enhanced Hydrogen Peroxide Sensing based on Prussian Blue modified Macroporous Microelectrodes 
dimanche 27 janvier 2013 Mokrushina A. V., Heim M., Karyakina E. E., Kuhn A., Karyakin A. A.,Electrochem. Comm. 2013, 29, 78-80. We report on the successful modification of macroporous microelectrodes with the electrocatalyst Prussian Blue, resulting in improved hydrogen peroxide sensing. When the pores of the electrode surface are completely filled with the electrocatalyst the resulting sensor shows a behavior similar...
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Wireless Electrografting of Molecular Layers for Janus Particle Synthesis 
vendredi 28 décembre 2012 Kumsapaya C., Bakai M.-F., Loget G., Goudeau B., Warakulwit C., Limtrakul J., Kuhn A., Zigah D.,Chemistry - A European Journal 2013, 19, 1577-1580. Glassy carbon beads are selectively functionalized on one side with an ultrathin organic layer by bipolar electrochemical reduction of diazonium salts to give Janus-type beads with a hybrid organic–inorganic composition (see scheme). The presence of...
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Hierarchical Macro-mesoporous Pt Deposits on Gold Microwires for Efficient Methanol Oxidation 
lundi 5 novembre 2012 Heim M., Wattanakit C., Reculusa S., Warakulwit C., Limtrakul J., Ravaine S., Kuhn A.,Electroanalysis 2013, 25, 888-894. Hierarchically ordered macro-mesoporous Pt films have been synthesized on gold microwires by filling the void space of a colloidal crystal template with mesoporous Pt through electrodepositing the metal in the presence of self-assembled surfactant molecules, followed by a...
Design of a Wireless Electrochemical Valve 
jeudi 1 novembre 2012 Bouffier L., Kuhn A., Nanoscale 2013, 5, 1305-1309. The control of motion of small objects is an emerging research area. Their design strongly depends on the strategy chosen to trigger the locomotion, which is typically obtained by either physical or chemical fueling. An ongoing challenge in this field is the remote control of the motion with space and time resolution. In this context, we...
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Effect of Novel Antibacterial Gallium-Carboxymethyl Cellulose on Pseudomonas Aeruginosa 
mardi 30 octobre 2012 Valappil S. P., Yiu H. H. P., Bouffier L., Hope C. K., Evans G., Claridge J. B., Higham S. M., Rosseinsky M. J., Dalton Trans. 2013, 42, 1778-1786. Gallium has emerged as a new therapeutic agent due partly to the scarcity in development of new antibiotics. In this study, a novel antibacterial gallium exchanged carboxymethyl cellulose (Ga-CMC) has been developed and tested for the susceptibility...
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Interest of the Sol-Gel Approach for Multiscale Tailoring of Porous Bioelectrode Surfaces 
vendredi 26 octobre 2012 Bon Saint Côme Y., Lalo H., Wang Z., Kohring G.W, Hempelmann R., Etienne M., Walcarius A., Kuhn A., Electroanalysis 2013, 25, 621-629. Gold nanoparticles have been co-encapsulated with d-sorbitol dehydrogenase and diaphorase in electrodeposited thin sol-gel films. We demonstrate here that the nanoparticles allow improving significantly the catalytic efficiency of the bioelectrodes. The hybrid...
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