Showing results 541 to 560 of 583
 Conjugated polymers strongly adhering to electrically conductinos substrates; Jérôme, Christine  ; et alPoster (2003, May 16) Detailed reference viewed: 13 (1 ULg)Surface modification of metallic stents by strongly adhering aliphatic polyestersAqil, Abdelhafid ; ; et alPoster (2003, May 16) Detailed reference viewed: 11 (3 ULg)Functionalization of AFM tips by electrograftingJérôme, Christine ; Willet, Nicolas ; Gabriel, Sabine et alPoster (2003, May 16) Detailed reference viewed: 17 (3 ULg)Preparation of reactive surfaces by electrografting: a route to biosensorsGabriel, Sabine ; Jérôme, Christine ; Jérôme, Robert Poster (2003, May 16) Detailed reference viewed: 7 (2 ULg)Polymer functionalized multi-walled carbon nanotubes; ; et al Poster (2003, May 16) Detailed reference viewed: 21 (3 ULg)Preparation and labelling of biodegradable drug nanocarriersRieger, Jutta ; ; et alPoster (2003, May 16) Detailed reference viewed: 8 (1 ULg)Controlled free radical polymerization initiated from the surface of electrically conducting substrates; Jérôme, Christine ; Detrembleur, Christophe et alPoster (2003, May 16) Detailed reference viewed: 10 (1 ULg)Functionalization of gold nanoparticles by stimuli responsive polymers for supramolecular assembling; Jérôme, Christine ; Jérôme, Robert Poster (2003, May 16) Detailed reference viewed: 10 (3 ULg) A micellar route to ordered arrays of magnetic nanoparticles: From size-selected pure cobalt dots to cobalt-cobalt oxide core-shell systems; ; et al in Advanced Functional Materials (2003), 13(5), 359-364 Starting with Co-salt-loaded inverse micelles, which form if the diblock copolymer polystyrene-block-poly(2-vinylpyridine) is dissolved in a selective solvent like toluene and CoCl2) is added to the ... [more ▼] Starting with Co-salt-loaded inverse micelles, which form if the diblock copolymer polystyrene-block-poly(2-vinylpyridine) is dissolved in a selective solvent like toluene and CoCl2) is added to the solution, monomicellar arrays of such micelles exhibiting a significant hexagonal order can be prepared on top of various substrates with tailored intermicellar distances and structure heights. In order to remove the polymer matrix and to finally obtain arrays of pure Co nanoparticles, the micelles are first exposed to an oxygen plasma, followed by a treatment in a hydrogen plasma. Applying in-situ X-ray photoelectron spectroscopy, it is demonstrated that: 1) The oxygen plasma completely removes the polymer, though conserving the original order of the micellar array. Furthermore, the resulting nanoparticles are entirely oxidized with a chemical shift of the Co 2P(3/2) line pointing to the formation Of Co3O4. 2) By the subsequent hydrogen plasma treatment the nanoparticles are fully reduced to metallic Co. 3) By exposing the pure Co nanoparticles for 100 s to various oxygen partial pressures p(O2), a stepwise oxidation is observed with a still metallic Co core surrounded by an oxide shell. The data allow the extraction of the thickness of the oxide shell as a function of the total exposure to oxygen (p(O2) x time), thus giving the opportunity to control the ferromagnetic-antiferromagnetic composition of an exchange-biased magnetic system. [less ▲] Detailed reference viewed: 13 (4 ULg)Complexation of uranyl ions by polypyrrole doped by sulfonated and phosphonated polyethyleneimine; ; et al in Journal of Applied Polymer Science (2003), 88(2), 352-359 Branched polyethyleneimine (PEI) was sulfonated by reaction with chloropropanesulfonylchloride and phosphonated by reaction with phosphorous acid and formaldehyde. The accordingly formed polyanions were ... [more ▼] Branched polyethyleneimine (PEI) was sulfonated by reaction with chloropropanesulfonylchloride and phosphonated by reaction with phosphorous acid and formaldehyde. The accordingly formed polyanions were used as doping agents for polypyrrole (PPy). The amount of doping polyanions into thin films of PPy was measured by Rutherford back-scattering. These films were tested for their capacity to extract uranyl ions from liquid wastes of low level activity. The uranium content was determined by neutron activation analysis, autoradiography, and gravimetry of uranium oxide after calcination. The resistance against static and dynamic leachings was also estimated. [less ▲] Detailed reference viewed: 19 (4 ULg)Controlled free radical polymerization of styrene initiated from alkoxyamine attached to polyacrylate chemisorbed onto conducting surfaces; Jérôme, Christine ; Detrembleur, Christophe et alin Chemistry of Materials (2003), 15(4), 923-927 A new inimer that associates an alkoxyamine, which is an initiator/mediator in nitroxide mediated radical polymerization (NMP), and a polymerizable acrylate has been synthesized and used in a two-step ... [more ▼] A new inimer that associates an alkoxyamine, which is an initiator/mediator in nitroxide mediated radical polymerization (NMP), and a polymerizable acrylate has been synthesized and used in a two-step "grafting-from" method. The acrylate has been first electropolymerized under a cathodic potential, such that the polymer is chemisorbed on the cathode. NMP of styrene has then been initiated from the electrografted polyacrylate chains with formation of polystyrene with controlled molecular weight and narrow polydispersity. [less ▲] Detailed reference viewed: 27 (5 ULg) Process for depositing strong adherend polymer coating onto an electrically conductive surfaceDetrembleur, Christophe ; ; et alPatent (2002) Process for depositing by electrografting a strong adherent polymer coating onto an electrically conductive surface comprising an electrochemical grafting at the surface of an active monomer for forming a ... [more ▼] Process for depositing by electrografting a strong adherent polymer coating onto an electrically conductive surface comprising an electrochemical grafting at the surface of an active monomer for forming a primer coating P onto said surface and having as general formula: X0 (meth)acrylate wherein X is either part of a preformed polymer or is an intermediate agent for polyaddition reaction or is an anchoring group for attachment of a molecule having at least one complementary reactive group. Such process allows formation of new primer by one-step electro-grafting of a reactive polymer called macromonomer.; Such process also allows further modification of an initial electrografted polymer (called primer coating) to increase the coating thickness by the so-called grafting-from technique i.e. polymerization of a second monomer or to introduce other types of polymers(also called top coating) via covalent attachment between the primer and the top coating through the X ester group by the so called grafting onto technique. Such process also allows to graft onto the primer coating compounds like functional polymer, peptide, protein, oligonucleotide, dyes, drugs, anti-bacterian compounds. [less ▲] Detailed reference viewed: 8 (4 ULg)Process for depositing strong adherend polymer coating onto an electrically conductive surface; Jérôme, Robert ; et alPatent (2002) Detailed reference viewed: 21 (2 ULg)Electrochemistry of lanthanum and uranium chlorides in organic media: Deposition of lanthanum and uranium; ; Marien, José et alin Journal of Radioanalytical & Nuclear Chemistry (2002), 253(3), 407-412 Molten salts have been widely used for the electrochemical preparation of lanthanum and uranium metals at high temperature. In this paper we demonstrate the feasibility of a similar process in ... [more ▼] Molten salts have been widely used for the electrochemical preparation of lanthanum and uranium metals at high temperature. In this paper we demonstrate the feasibility of a similar process in dimethylformamide (DMF) and in the mixture gamma-butyrolactone/tetrahydrofuran (gamma-BL/THF) The best conditions for the preparation were deduced from preliminary transient electrochemistry experiments and from secondary ions mass spectrometry (SIMS) measurements involving SIMS mappings and SIMS depth profile analyses. [less ▲] Detailed reference viewed: 17 (2 ULg)Full electrochemical synthesis of conducting polymer films chemically grafted to conducting surfaces; Jérôme, Christine ; et alin Langmuir (2002), 18(13), 5222-5230 This paper reports on the full electrochemical synthesis of electrically conducting polymers chemically grafted to conducting surfaces (e.g., glassy carbon, stainless steel, nickel, gold). It is based on ... [more ▼] This paper reports on the full electrochemical synthesis of electrically conducting polymers chemically grafted to conducting surfaces (e.g., glassy carbon, stainless steel, nickel, gold). It is based on new functional acrylate monomers, i.e., 3-(2-acryloyloxyethyl)thiophene and N-(2-acryloyloxyethyl)pyrrole, whose the synthesis is reported in this work. The polymerization process consists of two electrochemical steps. The first one is the cathodic electrografting of polyacrylate chains bearing a precursor of the conducting polymer in the ester group, either thiophene or pyrrole. In the second step, this precursor is polymerized under anodic polarization, in the presence or not of additional unsubstituted monomer in the electrochemical bath. Cyclic voltammetry was used to confirm that the two-component film is conducting and electrochemically active (reversible doping and dedoping). The chemical composition and the microscopic morphology of these composites were characterized by X-ray photoelectron spectroscopy and atomic force microscopy, respectively. [less ▲] Detailed reference viewed: 62 (0 ULg)Electrografting of preformed aliphatic polyesters onto metallic surfaces; Jérôme, Christine ; Detrembleur, Christophe et alin Langmuir (2002), 18(7), 2785-2788 Preformed aliphatic polyesters bearing pendent acrylate groups, poly(4-acryloyloxy-epsilon-caprolactone)co-epsilon-caprolactone) [poly(ACL-co-epsilonCL)], were grafted onto metallic surfaces by a cathodic ... [more ▼] Preformed aliphatic polyesters bearing pendent acrylate groups, poly(4-acryloyloxy-epsilon-caprolactone)co-epsilon-caprolactone) [poly(ACL-co-epsilonCL)], were grafted onto metallic surfaces by a cathodic electrochemical process. Content of acrylates must exceed a lower limit for them to be adsorbed on the cathode with the proper orientation and for the grafting to be successful. The strongly adhering films were analyzed by IR reflection-absorption spectroscopy and scanning electron microscopy. As a result of the known miscibility of poly-e-caprolactone with poly(vinyl chloride) (PVC), the pregrafting of poly(ACL-co-epsilonCL) imparts strong adhesion to PVC topcoats. [less ▲] Detailed reference viewed: 15 (3 ULg)New silica based polymeric systems designed for the solid-liquid extraction of uranyl ions; Leroy, Delphine ; et alin Journal of Materials Chemistry (2002), 12(1), 137-142 Detailed reference viewed: 103 (14 ULg)Electrografting of conducting polymers onoto ITO surfaces; Jérôme, Christine ; et alPoster (2001, May 16) Detailed reference viewed: 16 (2 ULg)Surface modification of conductive substrates by electrografting combined with controlled/living polymerization techniquesJérôme, Christine ; ; Detrembleur, Christophe et alConference (2001, May 16) Detailed reference viewed: 10 (1 ULg)Full-electrochemical preparation of conducting/insulating binary polymer filmsJérôme, Christine ; ; et alin Chemistry of Materials (2001), 13(5), 1656-1664 Binary polymer films consisting of an insulating polymer and a conducting polymer have been successfully prepared by sequential electropolymerization of the parent monomers. The insulating polymer ... [more ▼] Binary polymer films consisting of an insulating polymer and a conducting polymer have been successfully prepared by sequential electropolymerization of the parent monomers. The insulating polymer (polyacrylonitrile or polyethylacrylate) is formed under cathodic polarization in a potential range where the growing chains are chemically grafted onto the nickel or carbon electrode. The conducting polymer (polybithiophene or polypyrrole) is formed by electrooxidation of the parent monomer. The electrochemical reactions and the electrochemical properties of the films have been analyzed by cyclic voltammetry and chronoamperometry. The influence of the main experimental parameters on the composition and morphology of the films has been investigated by X-ray photoelectron spectroscopy and atomic force microscopy. This approach strongly improves the adhesion of the conducting polymer as a result of its combination with the grafted polyacrylonitrile. This combination of insulating and conducting polymers is a way to tune the electroactivity of the conjugated chains. [less ▲] Detailed reference viewed: 53 (0 ULg) |
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