G. Tisserant, J. Gillion, J. Lannelongue, Z. Fattah, P. Garrigue, J. Roche, D. Zigah, B. Goudeau, A. Kuhn and L. Bouffier.
ChemElectroChem, 2016, 3, 387-391.
The preparation of surface gradients is a very hot topic in contemporary research. Among various physical chemistry approaches, bipolar electrochemistry allows the control of such gradients through the interfacial polarization between a conducting substrate and the electrolyte solution. Here, we report the straightforward single-step generation of metal composition gradients on cylindrical carbon fibers. The screening of different metal deposit morphologies which evolve gradually along a bipolar electrode is demonstrated with monometallic layers and also a bimetallic composite layer based on copper and nickel.
T. Yutthalekha, C. Warakulwit, J. Limtrakul, A. Kuhn
Electroanalysis, 2015, Special Issue Advanced Materials, in press
Chiral imprinted mesoporous platinum was electrochemically synthesized in the presence of mandelic acid and Brij 56 surfactant as chiral and mesoporous templates, respectively. The chiral cavity obtained by using mandelic acid as template can be used to distinguish between enantiomers of other chiral molecules in which the stereocentre has a correlated configuration with respect to the imprinted one. This recognition versatility was tested for the discrimination of DOPA enantiomers. Mesoporous platinum electrodes imprinted with (R)-mandelic acid preferentially react with L-DOPA and vice versa for the (S)-mandelic acid imprinted one, which is more reactive for D-DOPA.
A. Karajić, S. Reculusa, M. Heim, P. Garrigue, S. Ravaine, N. Mano, A. Kuhn
Adv. Mater. Interfaces, 2015, in press
We report the bottom-up design of a fully integrated and miniaturized electrochemical cell consisting of two independently addressable macroporous electrodes with well-defined porosity, controllable thickness and easily tunable spacing. The concept is based on the electrodeposition of alternating metal layers of gold and nickel through a colloidal crystal synthesized by the Langmuir-Blodgett technique. The proposed architecture shows good structural stability and a significant increase of active surface area. We demonstrate that electroactive species react efficiently with both electrodes, thus opening up new applications in the field of miniaturized electrochemical devices due to the versatility of this straightforward approach.
A. Srinivasan, J. Roche, V. Ravaine and A. Kuhn
Soft Matter, 2015, 11, 3958-3962
In the present work, we introduce a new approach for the synthesis of asymmetric particles made from electrically conducting polyaniline-alginate hydrogels by using bipolar electrochemistry. Such an intrinsic break of symmetry allows the soft beads to exhibit tunable motion at the air/water interface when loaded with ethanol due to controllable directed release of the solvent.
- Shearforce Positioning of Nanoprobe Electrode Arrays for Scanning Electrochemical Microscopy Experiments
- Generation of Metal Composition Gradients by Means of Bipolar Electrodeposition
- Effects of 50 Hz Magnetic Fields on Gap Junctional Intercellular Communication in NIH3T3 Cells
- Synthesis of Multivalent Silica Nanoparticles combining both Enthalpic and Entropic Patchiness