Stabilization of polyaniline by the incorporation of magnetite nanoparticles

Abstract

a b s t r a c tNanocomposites obtained from the polymerization of aniline in the presence of nanoparticles of magnetite (Fe 3 O 4 ) have been investigated in previous studies. However, there is a lack of information available on the redox interaction of the nanoparticle/conductive polymer couple and the stability that such an oxide can give to the organic phase. In this work, Fe 3 O 4 nanoparticles were incorporated into a PANi matrix by the in-situ oxidative polymerization method. A combination of X-ray diffraction, Mössbauer spectroscopy, transmission electronic microscopy, UV-visible spectroscopy as well as the cyclic voltammetric and Raman spectroscopy techniques, was used to understand the redox effect that the partially oxidized nanoparticles produced on the polymer. It was found that magnetite greatly stabilised PANi, mainly by enhancing the Leucoemeraldine/Emeraldine redox couple and also by reducing the bipolaronic state.

Heat transfer intensification using polyaniline based nanofluids: Preparation and application

“…Characterization colloidal PANI nanoparticles used in preparation of nanofluids Fig. 1 shows an absorbance band at 280 nm which is consistent with the literature reported data [39][40][41][42]. This band corresponds to the p-p * transition of the conjugated polymer.…”

Evidence of redox interactions between polypyrrole and Fe3O4 in polypyrrole–Fe3O4 composite films

“…Magnetite (Fe 3 O 4 ) particles were prepared using a hydrothermal method reported in the literature with few modifications [14][15][16][17]. Ferrous chloride solution was added dropwise (0.8 mL/s) to an alkaline solution (0.06 mol L −1 NaNO 3 and 3.3 mol L −1 NaOH) with 0.18 mol L −1 polyethylenglycol (PEG).…”

“…1a shows a TEM image of the synthesized magnetite particles obtained with a Tecnai 20 TW, D345, FP 5020/10 Phillips microscope. It is possible to observe the typical cubic shape of magnetite crystals around 100 nm size [17,18]. Moreover, an estimation of size distribution of magnetite particles in solution was made using light scattering (Malvern Instruments Ltd.), as shown in Fig.…”

Compósitos de polianilina e nanopartículas de magnetita eletropolimerizados sobre o aço AISI 1020: correlação entre variáveis operacionais, características eletroquímicas e propriedades anticorrosiva

“…1º ciclo: traço-ponto e traço-duplo ponto; 2º ciclo: linha cheia e traço.respectivamente). Este resultado difere de outros reportados na literatura; Jaramillo-Tabares et al observaram um deslocamento do par C/C' para valores pouco mais anódicos nos filmes compósitos de PAni/Fe 3 O 4 -np em relação aos de PAni[153].…”

“…ES é maior na presença das nanopartículas. Este resultado sugere uma estabilização eletroquímica do polímero em função da interação com as partículas de óxido e está de acordo com o proposto por Jaramillo-Tabares et al[153], embora estes autores não tenham detectado um deslocamento do par de oxirredução atribuído aos produtos de oxidação da PAni. Os demais autores citados também não relatam deslocamentos deste par[54,141,159].…”