RESUMEN
In this study, we present a novel method for fabricating semi-transparent electrodes by combining silver nanowires (AgNW) with titanium nitride (TiN) layers, resulting in conductive nanocomposite coatings with exceptional electromechanical properties. These nanocomposites were deposited on cellulose nanopaper (CNP) using a plasma-enhanced pulsed laser deposition (PE-PLD) technique at low temperatures (below 200 °C). Repetitive bending tests demonstrate that incorporating AgNW into TiN coatings significantly enhances the microstructure, increasing the electrode's electromechanical robustness by up to four orders of magnitude compared to commercial PET/ITO substrates. Furthermore, the optical and electrical conductivities can be optimized by adjusting the AgNW network density and TiN synthesis temperature. Our results also indicate that the nanocomposite electrodes exhibit improved stability in air and superior adhesion compared to bare AgNW coatings.
RESUMEN
BACKGROUND: Stable and non-toxic fluorescent markers are gaining attention in molecular diagnostics as powerful tools for enabling long and reliable biological studies. Such markers should not only have a long half-life under several assay conditions showing no photo bleaching or blinking but also, they must allow for their conjugation or functionalization as a crucial step for numerous applications such as cellular tracking, biomarker detection and drug delivery. RESULTS: We report the functionalization of stable fluorescent markers based on nanodiamonds (NDs) with a bifunctional peptide. This peptide is made of a cell penetrating peptide and a six amino acids long ß-sheet breaker peptide that is able to recognize amyloid ß (Aß) aggregates, a biomarker for the Alzheimer disease. Our results indicate that functionalized NDs (fNDs) are not cytotoxic and can be internalized by the cells. The fNDs allow ultrasensitive detection (at picomolar concentrations of NDs) of in vitro amyloid fibrils and amyloid aggregates in AD mice brains. CONCLUSIONS: The fluorescence of functionalized NDs is more stable than that of fluorescent markers commonly used to stain Aß aggregates such as Thioflavin T. These results pave the way for performing ultrasensitive and reliable detection of Aß aggregates involved in the pathogenesis of the Alzheimer disease.
Asunto(s)
Enfermedad de Alzheimer/diagnóstico , Amiloide/análisis , Colorantes Fluorescentes/química , Nanodiamantes/química , Amiloide/metabolismo , Péptidos beta-Amiloides/análisis , Péptidos beta-Amiloides/metabolismo , Animales , Benzotiazoles/química , Benzotiazoles/toxicidad , Biomarcadores/análisis , Línea Celular , Supervivencia Celular/efectos de los fármacos , Péptidos de Penetración Celular/química , Colorantes Fluorescentes/toxicidad , Humanos , Ratones Transgénicos , Nanodiamantes/toxicidad , Agregado de ProteínasRESUMEN
The design of an optical current sensor to be used in a pulsed power generator is presented. The current sensor is based on the polarization rotation by the Faraday effect. GEPOPU is a pulsed power generator, 110 kA, 120 ns double transit time, 1.5 Ω coaxial geometry, and current rise time of 50 ns. Two different optical geometries surrounding the conductor were tried, using Amici roof prism and pentaprism to go around the current once, as a way to preserve the state of polarization along the optical path by means of complementary reflections within the sensing element. We believe this to be the first time that such large and rapidly varying currents have been measured with this configuration. The values obtained for both geometries agree with the values obtained with a Rogowski coil. The traces obtained are completely noise-free and no significant time lag has been observed between the current determined from the Faraday rotation and the current measured using a Rogowski coil.