A laboratory experiment in which students synthesize Ag, Au, and Pt nanoparticles (NPs) and use them to modify screen printed carbon electrodes for the electroanalysis of the hydrogen peroxide content in commercially available teeth whitening strips is described. This experiment is designed for two 3-h laboratory periods and can be adapted for upper-division undergraduate students in instrumental analysis, materials science, or physical chemistry laboratories. The experiment presented has already been used as a hands-on component in a Functional Nanomaterials Course, which exposed students to the analysis of the electrochemical properties of metal nanoparticles. Moreover, it allows for teaching the basics of nanoparticle synthesis and enables students to learn the fundamentals of electrochemical sensing with nanostructured materials.
Droplet microfluidics can improve and accelerate chemical and biochemical processes by reducing volumes and times involved in processes such as diffusion, heating and mixing. Besides, the control of reaction time and interfacial properties can be also provided. Thus, a study on how to control and stabilize these particles has great importance. The present work presents simulations in CFD of a T Mixer, viewing to predict the size of droplets from the number of capillary. Some experiments are also carried out and the computational simulations can be considered validated.
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