Formation of Al–Al2O3 core–shell nanosphere chains during electron beam melting of γ-TiAl

Several core–shell nanosphere chains were observed in the electron beam melted Ti–48Al–2Cr–2Nb samples. The formation mechanism of such core–shell nanospheres, induced by Al vaporization, during the electron beam melting of γ-TiAl was investigated using the HRTEM, FESEM, STEM, and XRD analyses. The solidification of TiAl/Ti3Al lamellae, in the vicinity of the Al-diminished zones, was disclosed by microstructural studies. The core and shell of the nanospheres were characterized as porous Al and α-Al2O3, respectively. Finally, the formation of core–shell nanosphere chains in the additive manufactured γ-TiAl was schematically illustrated. © 2021 Elsevier Lt

BN-Fe3O4-Pd nanocomposite modified carbon paste electrode: Efficient voltammetric sensor for sulfamethoxazole

The present research presents synthesis and substantial utilization of a nanocomposite of boron nitride-Fe3O4�Pd (BN�Fe3O4�Pd) for modifying carbon paste electrode (CPE) to determine sulfamethoxazole (SMZ). Various techniques such as transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy were applied to characterize the synthesized nanocomposite. In addition, differential pulse voltammetry (DPV) was employed for anodic peak and quantitatively detecting SMZ. Based on the optimized condition, this novel sensor exhibited a linear response of 0.02�420.0 μM. The limitation of detection and quantitation values for SMZ were determined to be 0.008 μM and 0.027 μM, respectively. Moreover, this electrode could substantially be applied for the analysis of SMZ in the real samples (e.g., urine, tap water, river water). © 2021 Elsevier Ltd and Techna Group S.r.l

Recent developments in voltammetric and amperometric sensors for cysteine detection

This review article aims to provide an overview of the recent advances in the voltammetric and amperometric sensing of cysteine (Cys). The introduction summarizes the important role of Cys as an essential amino acid, techniques for its sensing, and the utilization of electrochemical methods and chemically modified electrodes for its determination. The main section covers voltammetric and amperometric sensing of Cys based on glassy carbon electrodes, screen printed electrodes, and carbon paste electrodes, modified with various electrocatalytic materials. The conclusion section discusses the current challenges of Cys determination and the future perspectives. © The Royal Society of Chemistry 2021