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 the grafted organic layers is revealed either by co-adsorption of gold nanoparticles or by coupling with a fluorescent molecule.

 

ChemEurJ2013 p1577 TOC

 

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... Read More...
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... Read More...
Photochemical Functionalisation of Optical Nanotips with a Rhodamine Chemosensor for Remote Through-Fiber Detection of Hg2+
lundi 21 octobre 2013
Chen K., Adam C., Sojic N., Schmittel M.,RSC Adv. 2013, 33, 24140–24145. For remote Hg2+ detection, an array of nanotips was covalently functionalised using a versatile photochemical approach. After chemical etching of an optical fiber bundle to generate the nanotip array, a protected n-propyl amine was grafted onto the tip surface by silanisation and thereafter photodeprotected by irradiation... Read More...
Pickering Emulsions Stabilized by Soft Microgels: Influence of the Emulsification Process on Particle Interfacial Organization and Emulsion Properties
jeudi 19 septembre 2013
Destribats M., Wolfs M., Pinaud F., Lapeyre V., Sellier E., Schmitt V., Ravaine V.,Langmuir 2013, 29, 12367–12374. This work reports a new evidence of the versatility of soft responsive microgels as stabilizers for Pickering emulsions. The organization of microgels at the oil–water interface is a function of the preparation pathway. The present results show that emulsification energy can be... Read More...
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... Read More...
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... Read More...
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... Read More...
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... Read More...
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,... Read More...
Electrochemiluminescent Polymer Film with suitable Redox “turn-off” Absorbance window for Remote Selective Sensing of Hg2+
jeudi 16 mai 2013
Shu Q., Adam C., Sojic N., Schmittel M.,Analyst 2013, 138, 4500-4504. An electrochemiluminescent sensing scheme is presented for remote detection of Hg2+ through an ITO-coated nanostructured optical fibre bundle. It is based on the electropolymerisation of CPDT-linked ruthenium phenanthroline complexes carrying azacrown ethers as the receptor units (CPDT =... Read More...
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... Read More...
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... Read More...
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... Read More...
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... Read More...
Chemiluminescence from Asymmetric Inorganic Surface Layers generated by Bipolar Electrochemistry
jeudi 7 mars 2013
Fattah Z., Roche J., Garrigue P., Zigah D., Bouffier L., Kuhn A.,Chem. Phys. Chem. 2013, 14, 2089-2093. Blue light on a Janus rod: Prussian Blue (PB) is locally generated in an asymmetric way on a graphite rod by indirect bipolar electrodeposition (IBED). The presence of this inorganic layer efficiently promotes luminol chemiluminescence, which is revealed by an emission of blue light at one end... Read More...
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... Read More...
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... Read More...
Oxygen Plasma Treatment Of Platinized Ultramicroelectrodes Increases Sensitivity For Hydrogen Peroxide Detection On Mitochondria
jeudi 24 janvier 2013
Ben-Amor S., Devin A., Rigoulet M., Sojic N., Arbault S., Electroanalysis 2013, 25, 656-663. Hydrogen peroxide is a major bio-active molecule produced by mitochondria during aerobic metabolism. In order to monitor that production, platinized ultramicroelectrodes with high surface-area were used. Their sensitivity was significantly improved following an oxygen plasma treatment. Cyclic voltammetry... Read More...
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...
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... Read More...
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... Read More...
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... Read More...
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... Read More...