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 surface. The residence time of the particle on the electrode is thus controlled by the optical tweezers. The detection is based on diffusional hindrance by the insulating objects which alters the fluxes of the redox Ru(NH3)63+ species toward the UME and thus its mass-transfer limited current. We have optically deposited successively 1, 2, and 3 beads of 3-μm radius on the UME surface, and we have recorded the variations of the current depending on their landing locations that were optically controlled. Finally we decreased the current by partially blocking the electroactive surface with a six-bead assembly. The variation of the steady-state current and the approach curves allow for the indirect electrochemical localization of the bead in the vicinity of the UME, not only when the bead is in contact but also when it is levitated at distances lower than the UME radius. These experiments show that single particles or more complex structures may be manipulated in situ in a contactless mode near the UME surface. From comparison with simulations, the electrochemical detection affords an indirect localization of the object in the UME environment. The developed approach offers a potential application for interrogating the electrochemical activity of single cells and nanoparticles.

 

AnalChem2013 p8902 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... 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... 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.... 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... 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...
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... 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... 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.... 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... 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... 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... 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... 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... 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... 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... 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... 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... 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... 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... Read More...
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... 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... 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... 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... Read More...