Publications by Vincent Laporte

Postpolymerization Modification of Poly(glycidyl methacrylate) Brushes: An XPS Depth-Profiling Study

Raphaël Barbey, Harm-Anton Klok, Vincent Laporte

Surface-initiated polymerization represents a versatile strategy to modify a diverse range of materials with thin, functional polymer coatings. While in many cases the desired functional groups can be directly incorporated via (co)polymerization of the app ...

American Chemical Society2013

Transfer and State Changes of Fluorine at Polytetrafluoroethylene/Titania Boundaries by Mechanical Stressing and Thermal Annealing

Vincent Laporte, Danielle Gomes Passos Silva, Di Wang

Fluorine in polytetrafluoroethylene (PTFE) changes its states and transfers to titania by comilling and annealing of a titania-PTFE mixture. XPS, F-19 MAS NMR, FT-IR. Raman spectra, TEM and EDX analyses consistently indicated the oxidative decomposition of ...

Amer Chemical Soc2013

Characterization of Three Amino-Functionalized Surfaces and Evaluation of Antibody Immobilization for the Multiplex Detection of Tumor Markers Involved in Colorectal Cancer

Nicolas Xanthopoulos, Vincent Laporte

Antibody microarrays are powerful and high-throughput tools for screening and identifying tumor markers from small sample volumes of only a few microliters. Optimization of surface chemistry and spotting conditions are crucial parameters to enhance antibod ...

Amer Chemical Soc2013

Application of a Versatile Nanoparticle Stabilizer in Phase Transfer and Catalysis

Paul Joseph Dyson, Vincent Laporte, Ilaria Biondi

Gold and rhodium nanoparticles stabilized by a cationic polymer can be readily modified by anion exchange to afford nanoparticles that may be dispersed in a wide range of organic solvents and ionic liquids. The catalytic activity of the Rh nanoparticle dis ...

Wiley-V C H Verlag Gmbh2012

TaOxNy Sputtered Photoanodes For Solar Water Splitting

Michael Graetzel, Rosendo Sanjines, Nicolas Xanthopoulos, Maurin Cornuz, Vincent Laporte, Kevin Sivula

A series of TaOxNy photoelectrodes were deposited on F:SnO2 (FTO) substrates by DC reactive sputtering at room temperature, under a mixture of Ar, N-2 and O-2. The effects of the O-2 partial pressure during deposition (Po-2) on the films crystallinity, the ...

Elsevier Science Bv2012

Combustion synthesized TiO2 for enhanced photocatalytic activity under the direct sunlight-optimization of titanylnitrate synthesis

Vincent Laporte

Optimized synthesis of Ti-precursor 'titanylnitrate' for one step combustion synthesis of N- and C-doped TiO2 catalysts were reported and characterized by using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), diffused reflectance UV ...

Pergamon-Elsevier Science Ltd2012

Low-Temperature Preparation of Tailored Carbon Nanostructures in Water

Raffaele Mezzenga, Vincent Laporte, Davide Demurtas, Anna Fontcuberta i Morral, Bernt Ketterer, Holger Frauenrath, Tobias Hoheisel, Ruth Szilluweit, Martin Fritzsche

The development of low-temperature carbonization procedures promises to provide novel nanostructured carbon materials that are of high current interest in materials science and technology. Here, we report a "wet-chemical" carbonization method that utilizes ...

American Chemical Society2012

Surface Functionalisation of Alumina Ceramic Foams with Organic Ligands

Sandrine Gerber, Vincent Laporte, Françoise Borcard, Pascal Miéville, Marc Anthony Caporini

Different anchoring groups have been studied with the aim of covalently binding organic linkers to the surface of alumina ceramic foams. The results suggested that a higher degree of functionalisation was achieved with a pyrogallol derivative - as compared ...

2012

Reducing recombination in ZnO photoanodes for dye sensitised solar cells through simple chemical synthesis

Michael Graetzel, Vincent Laporte, Lioz Etgar

A method has been developed to synthesise zinc oxide nanowire arrays that demonstrate superior device performance compared to conventional ZnO nanowires within dye sensitised solar cells (DSSCs). This simple yet effective methodology has produced nanowires ...

Royal Society of Chemistry2012

Introduction of oxygen vacancies and fluorine into TiO2 nanoparticles by co-milling with PTFE

Vincent Laporte, Benjamin Bauer

Solid-state processes of introducing oxygen vacancies and transference of fluorine to n-TiO2 nanoparticles by co-milling with poly(tetrafluoroethylene) (PTFE) powder were examined by diffuse reflectance spectroscopy (DRS) of UV, visual, near- and mid-IR re ...

2012

Highly active oxide photocathode for photoelectrochemical water reduction

Michael Graetzel, Vincent Laporte, Kevin Sivula, Adriana Paracchino

A clean and efficient way to overcome the limited supply of fossil fuels and the greenhouse effect is the production of hydrogen fuel from sunlight and water through the semiconductor/water junction of a photoelectrochemical cell, where energy collection a ...

Nature Publishing Group2011

Measurement and anisotropy of grain boundary energy in Cu-1 wt.% PB

Andreas Mortensen, Vincent Laporte, Doris Empl

A method is presented for the simultaneous measurement of relative grain boundary energy and all five macroscopic grain boundary degrees of freedom in leaded copper. When compared to the Wynblatt–Takashima model, results suggest a lowered boundary energy w ...

2010

Improvement of elevated temperature mechanical properties of Cu–Ni–Sn–Pb alloys

Andreas Mortensen, Vincent Laporte, Doris Empl

Cu-Ni-Sn alloys with Pb additions exhibit high mechanical strength at room temperature coupled with good machinability but experience a significant ductility loss above the melting point of lead. We explore here the influence of minor additions of Al, Mn, ...

Elsevier2010

Dihedral Angles in Cu-1wt.%Pb: Grain Boundary Energy and Grain Boundary Triple Line Effects

Laurent Felberbaum, Andreas Mortensen, Vincent Laporte, Doris Empl

The dihedral angle shown by intergranular lead inclusions in Cu-1 wt.% Pb alloys is measured varying the purity of the metal and the temperature. Several measurement methods are used and compared, namely classical two-dimensional (2D) methods based on meta ...

2009

Processing of Ag-Cu alloy foam by the replication process

Andreas Mortensen, Ludger Weber, Etienne Combaz, Vincent Laporte, Frédéric Diologent, Fabien Duc

Particulate reinforced material ...

2009

Intermediate temperature embrittlement of copper alloys

Andreas Mortensen, Vincent Laporte

Copper and its alloys generally display a severe reduction in ductility between roughly 300 and 600 degrees C, a phenomenon variously called 'intermediate temperature embrittlement' or 'ductility trough behaviour'. This review of the phenomenon begins by p ...

2009

Equilibrium shape of a liquid intergranular inclusion in a stressed elastic solid

Laurent Felberbaum, Andreas Mortensen, Vincent Laporte

The influence of applied stress on the equilibrium shape of a liquid intergranular inclusion is derived to show that (i) results differ significantly from those for a void, and (ii) this difference explains the experimental data if liquid inclusions behave ...

2008

Corrélation entre la forme d'inclusions intergranulaires et l'énergie de joints de grains dans un alliage Cu-1Pb

Andreas Mortensen, Vincent Laporte, Frédéric Diologent

2006