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A new ceramic carbon polyaniline electrode material, namely Sonogel-Carbon-polyaniline (SNG-C-PANI), was synthesized using high-power ultrasound. The synthesis conditions were optimized by means of a full factorial design. The electroactivity of polyaniline, previously characterized by means of Raman spectroscopy, is retained into the sonogel matrix. After the synthesis and the subsequent characterization, the electrode material was applied in the electrochemical determination of a benchmark analyte, 4-chloro-3-methylphenol (PCMC), providing excellent figures of merit, e.g. high sensitivity (5.19 × 103 ± 110 µA/mM·cm2) and low limit of detection (0.36 µM), as well as suitable selectivity and reproducibility (%RSD < 4%). Besides the electroactive surface can be restored by performing a cyclic electrochemical treatment or simple mechanical polishing, minimizing fouling phenomena commonly found in conducting polymer layer-based sensors. The electrochemical detection of other chlorophenols of interest was also performed, obtaining remarkable analytical results. Finally, the electrochemical sensor was successfully applied in spiked tap water analyses. © 2021 The Author(s

Conducting polymers (CPs) are extensively studied due to their high versatility and electrical properties, as well as their high environmental stability. Based on the above, their applications as electronic devices are promoted and constitute an interesting matter of research. This review summa- rizes their application in common electronic devices and their implementation in electronic tongues and noses systems (E-tongues and E-noses, respectively). The monitoring of diverse factors with these devices by multivariate calibration methods for different applications is also included. Lastly, a critical discussion about the enclosed analytical potential of several conducting polymer-based devices in electronic systems reported in literature will be offered.

En este video se lleva a cabo una descripción de los reactivos necesarios para la síntesis ecológica de AuNPs. Se describe el proceso de pesada en balanza de cada uno de ellos y el de preparación de las correspondientes disoluciones.

The present study is focused on the ultrafast and green synthesis, via the co-precipitation method, of magnetic nanoparticles (MNPs) based on iron oxides using design of experiments (DOE) and high energy sonochemical approach, considering two main factors: amplitude (energy) of the ultrasound probe and sonication time. The combination of these techniques allowed the development of a novel one-minute green synthesis, which drastically reduced the amount of consumed energy, solvents, reagents, time and produced residues. This green sonochemical synthesis permitted to obtain mean particle sizes of 11 ± 2 nm under the optimized conditions of amplitude = 40% (2826 J) and time = 1 min. Their composition, structure, size, morphology and magnetic properties were assessed through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning and transmission electron microscopy (SEM & TEM), and vibrating sample magnetometry (VSM). The characterization results indicate the proper formation of MNPs, and the correct functionalization of MNPs with different coating agents. The functionalized MNPs were used as: i) biosensor, which could detect mercury in water in the range of 0.030–0.060 ppm, and ii) support onto which polyclonal antibodies were anchored and successfully bound to an osteosarcoma cell line expressing the target protein (TRIB2-GFP), as part of an immunoprecipitation assay.