Laboratoire P.A.S.T.E.U.R

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Light-Directed Particle Patterning by Evaporative Optical Marangoni Assembly

Nano Lett. 2015

 

Controlled particle deposition on surfaces is crucial for both exploiting collective properties of particles and their integration into devices. Most available methods depend on intrinsic properties of either the substrate or the particles to be deposited making them difficult to apply to complex, naturally occurring or industrial formulations. Here we describe a new strategy to pattern particles from an evaporating drop, regardless of inherent particle characteristics and suspension composition. We use light to generate Marangoni surface stresses resulting in flow patterns that accumulate particles at predefined positions. 

 
Sulfur radical species form gold deposits on Earth

Proc Natl Acad Sci U S A. 2015 Nov 3;112(44):13484-9.

 

Gold deposits are formed through the mobilization and transport of the metal by hydrothermal fluids circulating in the Earth crust. Precipitation occurs in localized regions leading to gold concentrations 1,000 to 1,000,000 times higher than the average gold concentration in the crust. Solvation of the metal in the hydrothermal fluid arises from the formation of stable complexes with salts present in the fluids.

 

Interactions between Human Antibodies and Synthetic Conformational Peptide Epitopes: Innovative Approach for Electrochemical Detection of Biomarkers of Multiple Sclerosis at Platinum Electrodes

The detection of human antibodies of Multiple Sclerosis patients was investigated based on the electrochemical oxidation of a synthetic antigenic probe, a glycopeptide Fc-CSF114(Glc) bearing a ferrocenyl moiety. Preliminary tests using human sera from patients and healthy donors validated this new approach aimed at developing innovative and fast diagnostic tools, based on electrochemical synthetic antigenic probes.

Discovery and Functional Analysis of a 4th Electron-Transferring Tryptophan Conserved Exclusively in Animal Cryptochromes and (6-4) Photolyases

 

A 4th electron transferring tryptophan in animal cryptochromes and (6-4) photolyases is discovered and functionally analyzed by transient absorption. It yields a much longer-lived flavin-tryptophan radical pair than the mere tryptophan triad in related flavoproteins, questioning the putative role of the primary light reaction of cryptochrome in animal magnetoreception.

Photo-induced cation translocation in a molecular shuttle based on a calix[4]-biscrown including DCM and DMABN chromophores

 

We present a new molecular shuttle, consisting of a calixarene core attached to two different photoactive centers, DCM and DMABN. We show that a K+ ion bound to the DCM-grafted crown is translocated towards the other site of the molecule upon photoexcitation, but not released to the bulk.