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Papers by Wanderson Silva
Applied Materials Today, 2018
The search for both new and sophisticated materials that meet the needs of the modern era, and fo... more The search for both new and sophisticated materials that meet the needs of the modern era, and for sustainable eco-efficient processes, has raised deep eutectic solvents (DES) to a prominent place. Research focused on the use of these solvents-highly advantageous in economic, practical, and environmental terms-for the creation of innovative materials has been growing fast, and a very large number of publications reporting the use of DES as valuable alternatives to overcome the limitations of conventional solvents, and even ionic liquids, has been published. DES have proved to offer tremendous opportunities and have opened new perspectives to produce novel and refined materials. This review focuses on recent advances concerning these new materials and on the practices that have been developed employing DES as solvents. The definition, preparation and unique properties of DES are first addressed, followed by a more extensive description of their applications in polymer, metal deposition and nanomaterial science and sensing technologies. Their impact in the production processes and in the properties of the materials obtained, as well as their key role as designer solvents, is highlighted.
A simply electrochemical method based on CdSe microparticles modified glassy carbon electrode (GC... more A simply electrochemical method based on CdSe microparticles modified glassy carbon electrode (GCE) was developed to determine theophylline using cyclic voltammetry and differential pulse voltammetry. Theophylline showed a well-defined oxidation peak at the fabricated electrode in phosphate buffer solution and the oxidation peak current is much higher than that at the bare GCE, indicating that CdSe can effectively improve the oxidation of theophylline. Several effect factors on theophylline determination were optimised, such as CdSe amount, solution pH, scan rate and accumulation time. Under the optimal conditions, the oxidation peak current of theophylline was proportional to its concentration in the range of 1.0–40 and 40–700 lM with a correlation coefficient of 0.9974 and 0.9956, respectively. The limit of detection was estimated to be 0.4 lM (S/N = 3). The developed method showed good reproducibility and excellent selectivity. The fabricated electrode was successfully used to determine theophylline in tea, carbonated cola drink, fruit juice drink, fermented milk drink and preserved fruit with acceptable recovery.
Applied Materials Today, 2018
The search for both new and sophisticated materials that meet the needs of the modern era, and fo... more The search for both new and sophisticated materials that meet the needs of the modern era, and for sustainable eco-efficient processes, has raised deep eutectic solvents (DES) to a prominent place. Research focused on the use of these solvents-highly advantageous in economic, practical, and environmental terms-for the creation of innovative materials has been growing fast, and a very large number of publications reporting the use of DES as valuable alternatives to overcome the limitations of conventional solvents, and even ionic liquids, has been published. DES have proved to offer tremendous opportunities and have opened new perspectives to produce novel and refined materials. This review focuses on recent advances concerning these new materials and on the practices that have been developed employing DES as solvents. The definition, preparation and unique properties of DES are first addressed, followed by a more extensive description of their applications in polymer, metal deposition and nanomaterial science and sensing technologies. Their impact in the production processes and in the properties of the materials obtained, as well as their key role as designer solvents, is highlighted.
A simply electrochemical method based on CdSe microparticles modified glassy carbon electrode (GC... more A simply electrochemical method based on CdSe microparticles modified glassy carbon electrode (GCE) was developed to determine theophylline using cyclic voltammetry and differential pulse voltammetry. Theophylline showed a well-defined oxidation peak at the fabricated electrode in phosphate buffer solution and the oxidation peak current is much higher than that at the bare GCE, indicating that CdSe can effectively improve the oxidation of theophylline. Several effect factors on theophylline determination were optimised, such as CdSe amount, solution pH, scan rate and accumulation time. Under the optimal conditions, the oxidation peak current of theophylline was proportional to its concentration in the range of 1.0–40 and 40–700 lM with a correlation coefficient of 0.9974 and 0.9956, respectively. The limit of detection was estimated to be 0.4 lM (S/N = 3). The developed method showed good reproducibility and excellent selectivity. The fabricated electrode was successfully used to determine theophylline in tea, carbonated cola drink, fruit juice drink, fermented milk drink and preserved fruit with acceptable recovery.