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Physical control of spatial localization of the production of gas bubbles from water electrolysis.
At a macroscopic scale, observation of the production of gas (oxygen or hydrogen) bubbles from water electrolysis shows that the phenomenon takes place everywhere on the surface of each electrode because the entire surface area of each of these electrodes is at the same voltage. This illustrates the paradigm of electrolysis where a physical parameter, i.e. the voltage difference between electrodes controls a chemical reaction. Here we show that both applying clever ac electrolysis voltages (...)
Nanometric Protein-Patch Arrays on Glass and Polydimethylsiloxane for Cell Adhesion Studieuses
F. Pi, P. Dillard, L. Limozin, A. Charrier, K. Sengupta
Nano Letters 13 7 3372-3378 (2013)
We developed a simple cost-effective bench-top protocol to functionalize substrates with nanometric protein patches with variable patch size, for cell adhesion studies. Patterned glass slides were used for advanced optical imaging of T-lymphocytes, to explore adhesion by reflection interference contrast microscopy, and the possible colocalization of T-cell receptor microclusters and the activating (...)
A field effect transistor biosensor with a γ-pyrone derivative engineered lipid-sensing layer for ultrasensitive Fe3+ ion detection with low pH interference
Field effect transistors have risen as one of the most promising techniques in the development of biomedical diagnosis and monitoring. In such devices, the sensitivity and specificity of the sensor rely on the properties of the active sensing layer (gate dielectric and probe layer). We propose here a new type of transistor developed for the detection of Fe3+ ions in which this sensing layer is made of a monolayer of lipids, engineered in such a way that it is not sensitive to pH in the (...)
Growth of Si ultrathin films on silver surfaces : Evidence of an Ag(110) reconstruction induced by Si
Romain Bernard, Thomas Leoni, Axel Wilson, Tony Lelaidier, Houda Sahaf, Eric Moyen, Loïc Assaud, Lionel Santinacci, Frédéric Leroy, Fabien Cheynis, Alain Ranguis, Haik Jamgotchian, Conrad Becker, Yves Borensztein, Margrit Hanbücken, Geoffroy Prévot, and Laurence Masson, Phys. Rev. B 88, 121411(R) (2013).
In the past five years, it has been shown that ultrathin Si films with potential intriguing properties can be grown on Ag substrates. A graphene-like signature in photoemission spectra has been (...)
Azacalixphyrin : the hidden porphyrin cousin brought to light
A porphyrin aza analogue that contains no pyrrol subunits absorbs in the entire visible region and partly in the near infra-red (up to 1000 nm). The central 16-membered ring containing four nitrogen atoms has 18 delocalized π electrons, and is thus aromatic. This new class of molecules revealed a high stability (even in the presence of water under air) owing to its unusual bis- zwitterionic character. As they are NIR-absorbing organic materials with a very low gap (Eg = 1.01 eV), the (...)
Comment un agrégat de palladium passe d’un comportement moléculaire à celui du métal massif ?
Il est connu qu’un agrégat de quelques atomes de métal possède une structure électronique proche de celle d’une molécule qui se manifeste par la présence de niveaux électroniques discrets alors que le métal massif possède une structure en bandes continues d’énergie. Ces différences de structure électronique se manifestent dans les propriétés physiques et chimiques des agrégats. Pour savoir comment s’effectue la transition entre ces deux régimes nous avons utilisé une sonde chimique : l’adsorption d’une (...)
One Hundred Years of Helicene Chemistry Synthesis, Chirality and Applications
Helicenes belong to a class of helical and polyaromatic molecules, which have a rich history in chemistry for over 100 years. Their helicity is generated from a twisted and distorded pi-system, coming from steric interactions of a series of ortho-fused benzene rings (figure 1).
Figure 1 : A helicene which contains seven ortho-fused benzene rings : [7]helicene
Their screwed structure provides left- or right-handed chiral molecules with unusual physical and optical properties. It often leads (...)
Des protons nus et autres ions légers à partir de l’eau…
Le contrôle à une échelle nanométrique d’une réaction élémentaire, la dissociation ionique de l’eau, a conduit à la réalisation d’une source ponctuelle de protons et d’ions légers ouvrant des perspectives nouvelles en optique des nano faisceaux d’ions.
Depuis longtemps, il est connu que des ions positifs sont émis dans le vide à partir d’une pointe métallique recouverte d’une couche d’eau lorsque la pointe est portée à un potentiel positif par rapport à son environnement. Initialement identifiés comme (H2O)n+ (...)
Plasmonic resonances in diffractive arrays of gold nanoantennas : near and far field effects
We examine the excitation of plasmonic resonances in arrays of periodically arranged gold nanoparticles placed in a uniform refractive index environment. Under a proper periodicity of the nanoparticle lattice, such nanoantenna arrays are known to exhibit narrow resonances with asymmetric Fano-type spectral line shape in transmission and reflection spectra having much better resonance quality compared to the single nanoparticle case. Using numerical simulations, we first identify two (...)
Ordered Misorientations and Preferential Directions of Growth in Mesocrystalline Red Coral Sclerites
N. Floquet* and D. Vielzeuf Aix-Marseille University, CNRS, CINaM UMR7325, 13288, Marseille, France
Cryst. Growth Des. 2012, 12, 4805−4820
Mesocrystals are superstructures made of mutually oriented submicrometer or nanometer-size crystallites. Sclerites located inside the organic tissues of the red coral are complex-shaped 50−80 μm large structures made of concentric layers of submicrometer crystallites of Mg-calcite. In a previous article (Am. Mineral. 2011, 96, 1228), we showed that (...)
Magnetic anisotropy and surface reaction in Mn5Ge3/Ge heterostructures
As device miniaturization reaches technological limits, adding spin degree of freedom to the electron into conventional electronics appears as a promising solution and magnetic structures based on Ge are particularly believed to lead to a new generation of devices. In this work, published in Physical Review B, we have studied the reorientation of the magnetization in Mn5Ge3 thin films from in plane to out of plane as a function of the film thickness. We have shown that this transition (...)
Nanopores : A Novel Self-Ordered Sub-10 nm Nanopore Template for Nanotechnology
Adv. Mater 24 (2012) 5094 Eric Moyen, Lionel Santinacci, Laurence Masson, Wulf Wulfhekel and Margrit Hanbücken
A wafer scale self-ordered array of high aspect ratio alumina nanopores with low porosity is obtained by anodization of aluminum. On page 5094, Margrit Hanbücken, Eric Moyen, and co-workers show how the understanding of alumina pore nucleation enables the pore diameter control down to less than 10 nm. Such a material can be used as a template to fabricate sub-10 nm zero- and (...)
Actualités
Loïc Assaud, doctorant au CINaM, reçoit le "young scientist award" de l’E-MRS 2013.
Les travaux de Loïc Assaud sur la fonctionnalisation de substrats nanostructurés pour l’énergie sont mis à l’honneur durant le Spring Meeting de l’E-MRS de Strasbourg. Il combine les techniques de structuration électrochimique des surfaces avec la fonctionnalisation par Atomic Layer Deposition (ALD). Ainsi, il a réalisé des nano-condensateurs ou des électro-catalyseurs pour les piles à combustibles. Sa recherche donc a été récompensée lors du symposium intitulé Energy Conversion Applications by Atomic (...)
Kheya Sengupta, chercheuse CNRS au CINaM, s’est vue décerner un financement du Conseil Européen de la Recherche (ERC) pour son projet SYNINTER
Le projet « SYNINTER » (Smart interrogation of the immune synapse by nano-patterned and soft 3D substrates), mené par Kheya Sengupta, vient d’être financé par le Conseil Européen de la Recherche, dans la catégorie « Starting Grants ». Ce projet cherche à comprendre la physique de l’adhésion cellulaire et plus spécifiquement de la synapse immunitaire.
The project “SYNINTER” (Smart interrogation of the immune synapse by nano-patterned and soft 3D substrates), directed by Kheya Sengupta, was recently awarded (...)
À noter
Séminaire CINaM
Ulrich Dahmen, Jeudi 05 Juin 2014 à 16H00 CINaM - Salle Raymond Kern, Recent Advances and (...)
