機(jī)械外文翻譯---利用超音速射流分散納米粒子的新型濕式粉碎機(jī)-其他專業(yè)(已修改)
2025-02-04 06:15 本頁(yè)面
【正文】 機(jī)械專業(yè)中英文文獻(xiàn)翻譯 中文 3096 字 英文原文 Dispersion of nanoparticles by novel wettype pulverizer utilized supersonic jet flow have examined the dispersion of barium titanate nanoparticles (BTNPs) and have discussed the effect of air pressure supplied to the nozzle on the dispersion by using novel wettype pulverizer utilized supersonic jet flow (SSJM). The aggregated particle size was decreased with increasing the air pressure and the collision times. In the optimized condition, almost the BTNPs were dispersed with the primary particles, however, further excessive collision had caused reaggregations. The degree of dispersion has been affected by the air pressure. The injected droplets had formed almost the same diameter regardless of air pressure and the velocity was increased with increasing of the air pressure and reached 300 m/s. We have speculated that the shockwave dominates the dispersion of BTNPs. 1. Introduction Nanoparticles are required highly in many applications such as dielectric materials for electronic devices, electrode materials for secondary batteries, etc. The nanoparticles have been frequently produced by the socalled build up processes such as hydrothermal process, coprecipitation process,and solgel method. For exploiting size effect of nanoparticles, it is crucial to control the dispersion and aggregation of the nanoparticles in suspension. However, nanoparticles aggregate more easily and strongly than submicron sized particles, and aggregated nanoparticles do not fragment , it is quite difficult to disperse nanoparticles perfectly, and the dispersion of nanoparticles has bee a fundamental technique for handling nanoparticles in industries. It has been reported that he nanoparticles were welldispersed by using beads mill [1]. Bead milling with balls several tens of micrometers in diameter has recently been developed as a new method to disperse nanoparticles to almost primary particle size [1]. However, the contamination caused by the grinded ball in bead milling was ten times higher than that caused by dry grinding [2].For providing nanoparticles dispersing method that can solve the above problem, we have developed novel wettype pulverizer utilized supersonic jet flow (hereafter referred to as supersonic wet jet mill。SSJM). In this study, we have reported the dispersing result of barium titanate nanoparticles (BTNPs) and have discussed the effect of air pressure on the dispersion by using the SSJM. 2. Experimental apparatus and procedure . Experimental apparatus Figure1 shows schematic diagram of the SSJM (left). The right part of describes shows the internal configuration of the nozzle part. The pressed air (maximum air pressure was MPa) was supplied at the top part of the nozzle. The Laval nozzle, which was used for the SSJM as 機(jī)械專業(yè)中英文文獻(xiàn)翻譯 shown in Figure1, is used to accelerate a pressed air passing through it to a supersonic speed, and upon expansion, to form the exha
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