Drobek M.,Montpellier University |
Motuzas J.,Montpellier University |
Durand V.,Montpellier University |
Durand V.,CEA Marcoule Nuclear Site |
And 6 more authors.
Journal of Membrane Science | Year: 2013
This work evaluates a new eco-friendly strategy for preparing ultrathin gas selective membranes on top of a microporous support. The method involves the dissolution of small amounts of fluorinated oligomers with alkoxysilane functional groups in supercritical CO2 (scCO2) and their transport to the substrate followed by the subsequent deposition/filtration under high pressure using a MFI zeolite membrane support (silicalite-1 (S-1), channel size ~0.55nm. During the deposition process, the oligomers are compressed on the zeolite surface and potentially forced in the intercrystalline defects of the zeolite membrane, if any. The performance of this new type of polymer/zeolite composite membranes has been evaluated for both single gas permeation and gas mixture separations. Attractive results were obtained applying oligomers with short molecular chains (~1.2-2nm; ~300-600gmol-1), easily forming an interpenetrated compact network during the deposition process at ΔP=6MPa and 50°C. High permselectivities were obtained at 25°C (αHe/N2*=85-135 and αCO2/N2*=50-80 with the He and CO2 permeance in the range 1-2.7*10-8molm-2s-1Pa-1) together with attractive separation factors (FHe/N2=49 and FCO2/N2=18). © 2012 Elsevier B.V. Source
Specific Polymers and Seb S.A. | Date: 2011-11-30
Provided is a metal-oxide nanofiller including at least two graft chains, at least one of the chains being hydrophilic and the other being a hydrophobic chain compatible with fluorinated polymers. The hydrophobic chain is an oligomer, the weight-average molar mass Mw of which is between 300 and 20,000 g/mol
Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: NMP.2013.4.0-2 | Award Amount: 3.77M | Year: 2013
The triggering of SOLPROCEL took place when COMSA EMTE and ICFO realized the potential that an organic photovoltaic (OPV) based technology has to be incorporated in transparent modules to generate electricity. Indeed, the OPV technology is the only one capable of producing semitransparent colorless cells providing a clear and undistorted image when looking through the device. It can be perfectly integrated in buildings faades offering an enormous potential for electricity production units to penetrate in urban areas. However, COMSA EMTE is well aware that transparent OPV cells are not yet ready for a module production phase and priority must be given to material research. Several issues, spanning from the development of low cost module fabrication to having stable and durable devices, must be addressed. Much of the success rests on having the materials for such low cost module fabrication. To achieve an optimal light harvesting in a solution-processed semitransparent OPV cell, we propose to combine the device processing developed by FAU with the photonic control developed by ICFO. Encouraged by COMSA EMTE and FAU, ICFO took the lead of SOLPROCEL. The project incorporates 3 companies which will be able to industrially produce the PV and nano materials needed in solution-processed OPV cells: Specific Polymers the PV polymers, Nanograde the nanoparticles used in the buffer layers, and RAS the Ag nanowires used in the electrodes. In SOLPROCEL such companies will be guided by three research institutions which can provide complementary knowhow in three of the fundamental aspects of OPV technology: nano-fabrication (FAU), light management (ICFO), and organic synthesis (FhG-IAP). The quantifiable goal of SOLPROCEL is to obtain the materials needed for fully solution-processed high performance transparent OPV cells and to raise the efficiency of such cells from 5.6% to 9%. This later value corresponding to 80% of the 12% efficiency of the corresponding opaque cell.
Agency: Cordis | Branch: FP7 | Program: CP | Phase: ICT-2013.3.3 | Award Amount: 3.86M | Year: 2013
The paradigm of societal uses protected by biometric identification (ID) from national security and controlled access, to health care, banking and leisure requires coming up with ever more reliable built-in ID detection systems. In this context, PiezoMAT proposes a new technology of high-resolution fingerprint sensors based on a matrix of interconnected piezoelectric nanowires (NWs). The long term objective of PiezoMAT is to offer high performance fingerprint sensors with minimal volume occupation for integration into built-in systems able to compete on the market with the best existing products.PiezoMAT proceeds by local deformation of an array of individually contacted piezoelectric NWs and reconstruction from generated potentials, whose amplitudes are proportional to the NW displacement. Each NW and its associated electronics constitute a sensor, or pixel. The sub-micron dimension of NWs allows for high spatial frequency sampling of every fingerprint feature, enabling extremely reliable fingerprint differentiation through detection of the smallest minutiae (pores and ridge shapes). Charge collection efficiency is very dependent on the electrode configuration on each NW. PiezoMAT explores several possible configurations associated with gradual levels of technological challenges and risks, with a strong focus on developing reliable device design tools for present and future application-related adaptability. For the purpose of the PiezoMAT research, it is foreseen to collect generated charges and analogue output signals via metal lines connected to deported electronics on a printed circuit board. This configuration does not allow for maximum NW integration density but is designed to yield sufficient resolution to demonstrate the concept, major technological achievements and actual performance increase as compared to the state-of-the-art. Long term developments will pursue full electronics integration for an optimal sensor resolution.
Negrell-Guirao C.,Charles Gerhardt Institute |
Carosio F.,Polytechnic University of Turin |
Boutevin B.,Charles Gerhardt Institute |
Cottet H.,Montpellier University |
Loubat C.,Specific Polymers
Journal of Polymer Science, Part B: Polymer Physics | Year: 2013
The work focuses on the synthesis and layer by layer (LbL) assembly of oligoallylamine and phosphonated oligoallylamine. To this aim, the synthesis of oligoallylamine and the phosphonated form have been done by free radical polymerization in aqueous media. First, radical polymerization of acid salt of allylamine was performed. This charged polymer could not be characterized using classical analytical techniques such as size-exclusion chromatography and matrix-assisted laser desorption/ionisation-time of flight mass spectroscopy due to presence of cations. This work demonstrated the interest of capillary electrophoresis (CE) to analyze charged oligomers, using very small amounts of samples. Entangled polymer solution CE was used as a size-based separation technique for the characterization of the molar mass distribution using indirect ultraviolet detection and calibration based on vinyl pyridine standards. Phosphorus-containing oligoallylamines having a number-average molar mass of 1600 g mol-1 and a 2.3 polydispersity index were obtained. When combined using the LbL approach, prepared polymers showed an exponential growth regime as demonstrated by Fourier transform infrared spectroscopy measurements. Furthermore, thermogravimetric analyses of the LbL-assembled polymers showed an extraordinary thermal and thermo-oxidative stability. © 2013 Wiley Periodicals, Inc. Source