COSTA, R. G. F.

MATTOSO, L. H. C.

RIBEIRO, C.

RCAAP - Repositório Científico de Acesso Aberto de Portugal

Functional polymer nanofibers through electrospinning: a route to produce versatile nanocomposites.

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Organised byInstitute of Macromolecular' Science and Engineering{ParumO'eUcadu p~·Q"tK~ttQyamKerofo. Indio. 686028onaC~nt~ejgrRural ManagemenParumbdjkaduP~O./KottayaKerolo. India187Functional Polymer Nannftbers through Electrospinninq:A Route toProduceVersatHe Nanocompositesaue Ribeiro, Rodrigo G. F. Coata and Luiz H, C. Matfosotione! Nanotechnology Laboratory for Agricu/tyre - Embrapa Agricultural instrumentatJon -Carfos, SP, Brazil .smell: cíJve@cnpdia.embrapa.br,he devetoprnent of viable nanetechnolcçles passes through the development of processing techniques,leh can be used in desired productíon scales w1th reprodudb1Hty, especlally ln the cases where the nnaloduct isstill at the nanoscale. This ls the case of nanofiberawhich can be used ln nonwaven products,nsors, cataívtíc supports and other producs. Several processes are used to proouce polymer nanotibers,ever, one of the mast successtul ts the electrcsptnning proeess, based in the Corona .effect developeden a hlgh voltage ls applied to a polymer solution ar melt. The fíbers processed in this condltion-oan easilyttaín diameters ranging frorn 10 to 500 nrn and high surface area-to-volume ratio.he processlng of nanocomposite solutions (polymer rnatrices with synthetic nanopartictes) using thisechníqueshcws a lnteresting physical confinement effect, since the loaded materiais are of the same síze.rder of the final fiber. It is especíalty intere;sting to join the surfaee properties of the loaded nanopartlcles withe general applications of nanofibers, and some bactericída] nanoparticles, sueh as anatase Ti02 or metallie9 nanoparticles.to this study, cornposite nanofibers of PVAlTi02 and PVAlsilver (Ag) were prepared successfully byelectrospinning in optírnlzed condltions. The nanopartlcles used as loadings were syntheslzed andeharacterízed, showínç effectlve sízes below 20 nm. The nanofibers were charecterízeo by SEM, EDS, XRDand UV~Vís dltfuse reflectance spectroscopy, showing that the technique can be used to produce fibers indiarneters below 100 nm wíth good reproducibitlty. The bactericldal and catalytic activlties of the nanofiberswere mvestiçated, showing some oxldative actíve against Rhodamine B dye (ln the case of PVAlTíOlnanofibers) and good bactericidal activities açaínst Staphylococcus aureus (87.8%) and Escherichia coli (85%)(ín the case of PVAlAg nanofibers). The versatility of the technique showed also tne possibítlty of a Iuture useas a coating system for different polyrners, in order to modify theír surface propsrties.*******

Functional polymer nanofibers through electrospinning: a route to produce versatile nanocomposites.

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RCAAP - Repositório Científico de Acesso Aberto de Portugal

Repository Open Access to Scientific Information from Embrapa