Simplified Cost-Effective Preparation of High-Performance Ag-Pt Nanowire Motors

A simplified cost-effective template approach for preparing efficient gold-free bimetal Ag–Pt nanowire motors, where the silver segment is obtained by a partial removal of the silver sacrificial layer is described (see figure). The unusual behavior, reflecting the ‘active’ role of the Ag segment and the asymmetry of the catalytic surface provides the ultrafast motion of these nanomotors

Simplified Cost-Effective Preparation of High-Performance Ag-Pt Nanowire Motors

A simplified cost-effective template approach for preparing efficient gold-free bimetal Ag–Pt nanowire motors, where the silver segment is obtained by a partial removal of the silver sacrificial layer is described (see figure). The unusual behavior, reflecting the ‘active’ role of the Ag segment and the asymmetry of the catalytic surface provides the ultrafast motion of these nanomotors

Determinação seletiva de p-nitrofenol com eletrodo de carbono vitreo recoberto com membrana de Nafion

Orientador: Lauro Tatsuo KubotaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de QuimicaMestrad

Development of an amperometric electrode for determination of glutathione in erythrocytes

Orientadores: Lauro Tatsuo Kubota, Nelci Fenalti HoehrTese (doutorado) - Universidade Estadual de Campinas, Instituto de QuimicaDoutoradoQuimica AnaliticaDoutor em Ciência

Recentes avanços e novas perspectivas dos eletrodos íon-seletivos

This paper describes the recent progress in the development of polymeric membranes for ion-selective electrodes. The importance of knowing the mechanism of potential development in membranes for ion-selective electrodes to reach lower detection limits and improve selectivity are discussed. Recent advances and future trends of research on ion-selective electrodes are also reported

Recentes avanços e novas perspectivas dos eletrodos íon-seletivos

This paper describes the recent progress in the development of polymeric membranes for ion-selective electrodes. The importance of knowing the mechanism of potential development in membranes for ion-selective electrodes to reach lower detection limits and improve selectivity are discussed. Recent advances and future trends of research on ion-selective electrodes are also reported

Nanomolar Detection Limits Of Cd\u3csup\u3e2+\u3c/sup\u3e, Ag\u3csup\u3e+\u3c/sup\u3e, And K \u3csup\u3e+\u3c/sup\u3e Using Paper-Strip Ion-Selective Electrodes

Paper-based ion-selective electrodes (ISEs) are simple, flexible, and cost-efficient in comparison to conventional solid-contact ISEs. Yet, paper-based ISEs have poor limits of detection (in the micromolar range) relative to conventional solid-contact ISEs. Here we describe the construction and optimization of ISEs based on commercially available filter paper modified with single-walled carbon nanotubes (SWCNTs), sputtered gold, and conductive polymer poly(3-octylthiophene) to support an ion-selective membrane. The ion-selective membrane presented here is based on the copolymer methyl methacrylate-decyl methacrylate (MMA-DMA). The copolymer MMA-DMA is highly water-repellent and has a low coefficient of diffusion, which makes it particularly suitable for the creation of sensors with high performance in reaching low limits of detection. Three different configurations of the electrodes have been characterized by using contact angle surface analysis, oxygen influence, and testing for the presence of a water layer. Paper-strip ISEs for cadmium, silver, and potassium ions were developed with groundbreaking limits of detection of 1.2, 25.1, and 11.0 nM, respectively. In addition to such low limits of detection, paper-strip ISEs display high selectivity for their ion of interest and high reproducibility. © 2014 American Chemical Society

Visible Light Activated Ion Sensing Using A Photoacid Polymer For Calcium Detection

Presented here is a sensing membrane consisting of a modified merocyanine photoacid polymer and a calcium ionophore in plasticized poly(vinyl chloride). This membrane is shown to actively exchange protons with calcium ions when switched ON after illumination at 470 nm, and the exchange can be followed by UV-vis spectroscopy. The sensing membrane shows no response in the ON state when calcium ions are absent. The limit of detection of the sensor is 5.0 × 10-4 M with an upper detection limit of 1.0 M. Thus, we demonstrate for the first time the use of a visible light activated, lipophilic photoacid polymer in an ion-sensing membrane for calcium ions, which highly discriminates potassium, sodium, and magnesium ions. © 2014 American Chemical Society