Novel silver nanoparticles/polyaniline composites were obtained through a two-phase water/toluene interfacial reaction. We show that by rigorously controlling the reaction time, different structures of nanocomposites can be obtained, such as thin sheet polyaniline around nanoparticles or polymer mass with homogeneously embedded within it. Samples characterized FT-IR, UV−vis−NIR and Raman spectroscopy, X-ray diffraction, cyclic voltammetry, TEM, HRTEM. Conductivity current−voltage...

Dodecanethiol-stabilized platinum nanoparticles of less than 3 nm have been synthesized for the first time through a modified two-phase liquid−liquid route. The H2PtCl6 precursor was transferred from water to toluene using tetra-n-octylammonium bromide, followed by addition dodecanethiol. Results obtained Raman spectroscopy, X-ray absorption near edge structure (XANES), and extended fine (EXAFS) indicate reaction between thiol, resulting in Pt(II)-stable complex that cannot be reduced sodium...

The effect of five different chemical treatments (HNO3, H2SO4, H2O2, HNO3 + H2SO4 and HCl) on the homogeneity, surface chemistry, structure dispersibility in water iron- iron oxide-filled multi-walled carbon nanotube samples was evaluated by X-ray diffractometry (XRD), Raman, UV-Visible photoelectron (XPS) spectroscopies, thermogravimetric analysis (TG) scanning electron microscopy (SEM). results indicate that are generally effective removing non-nanotube carbonaceous species present sample....

Solution processable semiconductor oxides have opened a new paradigm for the enhancement of lifetime thin film solar cells. Their fabrication by low-cost and environmentally friendly solution-processable methods makes them ideal barrier (hole electron) transport layers. In this work, we fabricate flexible ITO-free organic cells (OPV) printing applying an aqueous solution-processed V2O5 as hole layer (HTL) compared to devices PEDOT:PSS. The transparent conducting electrode was...

Abstract In this paper, a rapid and sensitive modified electrode for the simultaneous determination of hydroquinone (HQ) bisphenol A (BPA) is proposed. The these two compounds extremely important since they can coexist in same sample are very harmful to plants, animals environment general. carbon paste (CPE) was with silver nanoparticles (nAg) polyvinylpyrrolidone (PVP). PVP used as reducing stabilizing agent nAg from nitrate aqueous media. nAg‐PVP composite obtained characterized by...

In this work, particles of cobalt oxyhydroxide (III), CoO (OH), synthesized by alkaline precipitation were used in a carbon paste electrode modified [CPEM_CoO(OH)] for the detection phenolic compounds (catechol, guiacol, pyrogallol and salicylic acid). The cobalt-based acts as electron mediator, where ion Co (III) effectively oxidation/reduction analyte, via reductive dissolution. As result, exhibited good performance concentration range between 0 to 0.15 µmol L -1 , with limit (LOD) 10 -8...

The aim of this study was to evaluate the removal astrazon blue (AB) dye from aqueous solution by adsorption on an otherwise despoiling and useless mineral waste obtained coal mining (MWCM) how affected calcination. solid waste, as characterized elemental thermogravimetric analyses, X-ray diffraction, infrared spectroscopy, specific surface area measurements Boehm titrations, found be composed primarily calcite, dolomite, gypsum. Experiments investigated particularly conditions...

Purpose The purpose of this paper is to evaluate the protection against corrosion carbon steel SAE 1020 promoted by a niobium- and titanium-based coating produced from resin obtained Pechini method. Design/methodology/approach A was prepared with ammonium niobium oxalate as precursor K 2 TiF 6 titanium precursor. Carbon Steel plates were dip coated in calcinated for 1 h at 600 ºC. Scanning electron microscopy, energy dispersive spectroscopy X-ray diffraction used characterize morphologically...

This study describes the synthesis of Pani-Chitosan soluble hybrid composite through an in situ polymerization aniline hydrochloride acid media presence chitosan. The optical, morphological, structural, thermal and electrochemical characteristics these materials were studied by UV–Vis, FTIR, SEM, TG CV analysis. From UV-Vis formation was confirmed. SEM images show that Pani presented agglomerate morphology, while shows plate-like with higher surface area results showed has greater stability....

In this paper, we present a simple and inexpensive method for synthesizing conductive polyaniline magnetite composites. Firstly, the was synthesized by precipitation in basic medium from FeCl 3 , Rietveld refinement confirmed spinel structure. Different amounts of were used situ synthesis Pani-Fe3O4 composites to determine influence, resulting following materials: Pani-Fe O 4 (1) with 0.06 g (2) 0.24 g. The x-ray diffractogram demonstrates that interaction occurs between chains particles...

RESUMO Materiais híbridos formados entre polianilina e hidróxidos duplos lamelares de Zn Al (Pani/ZnAlHDL) foram obtidos adicionando a Polianilina (Pani) previamente preparada ao meio reacional da síntese dos HDLs também modificado com os surfactantes aniônicos dodecilsulfato sódio dodecilbenzenosulfato sódio. Os compósitos apresentaram cor azul que é característica fase base esmeraldina Pani. difratogramas raios X destes compostos deslocamento picos (003) (006) do ZnAlHDL para menores...

Abstract The mixed oxides of Ti/Fe were prepared by sol-gel method and the materials synthesized with different ratios (0, 25, 50 75 wt% iron). In spectrum material without iron, it is possible to observe predominant phase titanium oxide was anatase, which can be confirmed through x-ray diffraction. It observed that when iron added, rutile found evidence formation pseudobrookite (Fe

In this work it is described the morphological, structural and electrochemical studies of polyaniline-magnetite hybrid material (Pani-Fe 3 O 4 ), obtained through conventional chemical synthesis.The precursor were synthesized characterized by same techniques to compare evaluate if undergoes changes or improvements in their properties, compared precursor.By scanning electron microscopy observed agglomerates for Pani-Fe X-ray diffraction indicates a good interaction between phases.The UV-Vis...

This paper describes the synthesis and characterization of zirconium oxide (ZrO 2 ) mixed iron (iron zirconate), obtained by gelification (80 °C) calcination (600 citrus pectin inorganic nitrates. Thermal analysis demonstrated presence organic matter in solid after calcination, indicating that was strongly coordinated to phases. The X-ray diffractogram for zirconate, do not show peaks associated with oxides phases, zirconia matrix remained unchanged. Electronic spectra supported observations...

Abstract We report the results obtained on lignocellulosic kraft wastewater cleaning by adsorption using Rohm & Haas polymeric adsorbent Amberlite XAD-7. This resin shows a suitable retention capacity for ligninic compounds, but not carbohydrates derived from cellulose and hemicelluloses. Regeneration has also been studied. can be efficiently achieved with 1 N NaOH.

Cleaner chemical procedures, with low waste generation, less consumption of raw materials and energy, has been a critical challenge towards the development technologically sophisticated or devices, including electrochemical sensors, adsorbents environmental contaminants electronic capacitors.This study was devoted to an alternative synthetic route obtain composite based on polyaniline (Pani) magnetite.The also considered from economical perspective, under green chemistry principles, show how...