Search results for "Oxidació electroquímica"

showing 3 items of 3 documents

Synthesis of polymer nanogels by electro-Fenton process: investigation of the effect of main operation parameters

2017

Recently, electro-Fenton (EF) process has been shown as a promising, facile, effective, low cost and environmentally-friendly alternative for synthesizing polymer nanogels suitable as biocompatible nanocarriers for emerging biomedical applications. Here, the electrochemically-assisted modification of poly(vinylpyrrolidone) (PVP) by EF process was studied to assess the role of key operation parameters for a precise modulation of polymer crosslinking and its functionalization with [sbnd]COOH and succinimide groups. The dimensions of the nanogels, in terms of hydrodynamic radius (Rh) and weight-average molecular weight (Mw), can be tuned up by controlling the electrolysis time, current density…

Hydrodynamic radiusGeneral Chemical Engineering02 engineering and technology010402 general chemistry01 natural scienceslaw.inventionGel permeation chromatographychemistry.chemical_compoundSuccinimidelawPolymer chemistryElectrochemistryChemical Engineering (all)Static light scatteringGas-diffusion electrodechemistry.chemical_classificationElectrolysisPolymer crosslinkingOxidació electroquímicaPolymerSettore ING-IND/27 - Chimica Industriale E Tecnologica021001 nanoscience & nanotechnology0104 chemical sciencesElectrolytic oxidationChemical engineeringchemistryElectrochemical synthesiSurface modificationElectro-Fenton proceSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyHydroxyl radicalNanogelElectrochimica Acta
researchProduct

Facile crosslinking of poly(vinylpyrrolidone) by electro-oxidation with IrO2-based anode under potentiostatic conditions

2018

Abstract: The modification of polymer architectures by reaction with chemically adsorbed hydroxyl radicals has been thoroughly investigated by electrolyzing dilute aqueous solutions of the biocompatible polymer poly(vinylpyrrolidone) (PVP), using an undivided electrolytic cell with a Ti/IrO2–Ta2O5(DSA®) anode. Several electrolyses were performed to assess the influence of the applied potential, the circulated charge and the PVP concentration, which was always kept low to avoid chain overlapping. From the results obtained, it can be concluded that the electro-oxidation of PVP solutions using a cheap anode is an effective method to crosslink initially isolated polymer chains, eventually incre…

Materials Chemistry2506 Metals and AlloysRadicals (Chemistry)Materials sciencePolymersElectrolytic cellGeneral Chemical EngineeringRadicalmacromolecular substances02 engineering and technologyPoly(vinylpyrrolidone)010402 general chemistryElectrochemistry01 natural sciencesElectrosynthesiElectrolysisNanogelAdsorptionElectròlisiMaterials ChemistryElectrochemistryChemical Engineering (all)chemistry.chemical_classificationCrosslinkingAqueous solutiontechnology industry and agricultureDimensionally stable anodeOxidació electroquímicaRadicals (Química)PolymerSettore ING-IND/27 - Chimica Industriale E Tecnologica021001 nanoscience & nanotechnologyPolímers0104 chemical sciencesAnodeElectrolytic oxidationchemistryChemical engineeringSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyHydroxyl radicalElectrode potentialJournal of Applied Electrochemistry
researchProduct

Crosslinking of poly(vinylpyrrolidone) activated by electrogenerated hydroxyl radicals: a first step towards a simple and cheap synthetic route of na…

2016

A facile electrosynthesis route for the preparation of polymer nanogels based on the in situ production of hydroxyl radicals is reported for the first time. Electro-Fenton process with continuous H2O2 electrogeneration and Fe2+ regeneration performs better than electro-oxidation with a boron-doped diamond or dimensionally stable anode for promoting crosslinking of poly(vinylpyrrolidone). Keywords: Electrogenerated hydroxyl radicals, BDD, DSA, Electro-Fenton, Polymer modification, Nanogel

Radicals (Chemistry)PolymersRadical02 engineering and technologyengineering.material010402 general chemistryElectrosynthesisDSA01 natural scienceslcsh:ChemistryNanogelPolymer chemistryElectrochemistrychemistry.chemical_classificationDiamondOxidació electroquímicaRadicals (Química)Electrogenerated hydroxyl radicalPolymer021001 nanoscience & nanotechnology0104 chemical sciencesAnodePolímersPolymer modificationElectrolytic oxidationlcsh:Industrial electrochemistrylcsh:QD1-999chemistryElectro-Fentonengineering0210 nano-technologyBDDlcsh:TP250-261Nanogel
researchProduct