1,721,104 research outputs found
Inversely Finding Peculiar Reaction Conditions toward Microfluidic Droplet Synthesis
No full textWith the development of microfluidics, there are increasing reports of syntheses using not only conventional laminar flow at the microscale, but also the dissociation and aggregation of microdroplets. It is known, to some extent, that the microfluidics scale differs from normal scales in terms of the specific surface area, mass diffusion, and heat conduction; these are opposite to those in scale-up in-plant chemical engineering. However, it is not easy to determine what changes when the microdroplet flows through the channel. In this context, the author would like to clarify how the behavior of chemical species, which is expected to appear unique at the nanoscale, contributes to chemical reactions. What do we need in order to develop a completely new theory of chemical reactions? The characteristics of chemical reactions on the nanoscale are clarified via the encountering of solutions by the microfluidic device itself, or the chemical reaction of nanoscale droplets generated by the microfluidic device. Specifically, in recent years, experimental reports have accumulated that are expected to develop a fluidic device that can stably generate nanodroplets, and complex reactions of different reactivity are expected to occur that are specific to the nanoscale. In this short article, microfluidic devices, nanoscale droplets, experimental synthetic examples, and findings that may provide solutions are described
Cases of near misses in chemical laboratories of universities and their countermeasures
Get PDFIn this study, interviews with undergraduate and graduate students about incidents that did not result in an accident but felt dangerous (so-called near miss incidents) that occurred in the chemical laboratory at the university (to which the author belongs) in 2023 were conducted. An explanation of near-miss cases and the causes attributed to the experimenter is provided. Specifically, potential dangers related to (1) contact with hazardous chemicals, (2) handling of glassware, and (3) working spaces and electricity frequently occur. Comparing undergraduate and graduate students, it was found that the former tended to think about concrete and individual countermeasures, while the latter tended to discuss causes and countermeasures from a broader perspective; therefore, they were differentiated based on the description column. Comments from the graduate students were categorized into corresponding case categories and recorded in a discussion column. Furthermore, a summary section is included on who should be careful, their outlook, and their mindset
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