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)

1、機(jī)械專(zhuān)業(yè)中英文文獻(xiàn)翻譯中文 中文 3096 字英文原文 英文原文Dispersion of nanoparticles by novel wet-type pulverizer utilized supersonic jet flowAbstract.We have examined the dispersion of barium titanate nanoparticles (BT-NPs) andhave discussed th

2、e effect of air pressure supplied to the nozzle on the dispersion by using novelwet-type pulverizer utilized supersonic jet flow (SSJM). The aggregated particle size wasdecreased with increasing the air pressure and the

3、collision times. In the optimized condition,almost the BT-NPs were dispersed with the primary particles, however, further excessivecollision had caused reaggregations. The degree of dispersion has been affected by the ai

4、rpressure. The injected droplets had formed almost the same diameter regardless of air pressureand the velocity was increased with increasing of the air pressure and reached 300 m/s. Wehave speculated that the shockwave

5、dominates the dispersion of BT-NPs.1. IntroductionNanoparticles are required highly in many applications such as dielectric materials for electronicdevices, electrode materials for secondary batteries, etc. The nanoparti

6、cles have been frequentlyproduced by the so-called build up processes such as hydrothermal process, coprecipitation process,and sol-gel method. For exploiting size effect of nanoparticles, it is crucial to control the di

7、spersion and aggregation of the nanoparticles in suspension. However, nanoparticles aggregate more easily and strongly than submicron sized particles, and aggregated nanoparticles do not fragment easily.Therefore, it is

8、quite difficult to disperse nanoparticles perfectly, and the dispersion of nanoparticles has become a fundamental technique for handling nanoparticles in industries. It has been reported that he nanoparticles were well-d

9、ispersed by using beads mill [1].Bead milling with balls several tens of micrometers in diameter has recently been developed as anew method to disperse nanoparticles to almost primary particle size [1]. However, the cont

10、amination 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 wet-t

11、ype 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 (BT-NPs) and have discussed the

12、effect of air pressure on the dispersion by using the SSJM.2. Experimental apparatus and procedure2.1. Experimental apparatusFigure1 shows schematic diagram of the SSJM (left). The right part of describes shows the 機(jī)械專(zhuān)業(yè)中

13、英文文獻(xiàn)翻譯Nano-ZS, Malvern,UK). A shape and microstructure of the BT-NPs were examined with a transmission electron microscope (TEM, JEM-3200EX, JEOL, Japan) and a field emission scanning electron microscope (FESEM, S-4800,

14、Hitachi, Japan).For discussing the effect of air pressure on the dispersion by use of the SSJM, size and velocity distributions of droplets were measured as follows. Distilled water was injected under various airpressure

15、s from 0.3 to 0.6 MPa. The size and velocity distribution of droplets at a distance of 100 mm away from the nozzle exit were measured simultaneously by Phase Doppler Anemometry (Dantec Dynamics, Denmark)3. Result and dis

16、cussionFigure 2. Effect of collision number on cumulativemean diameter of sol-gel BTsuspensions under various air pressures.Figure 4. FESEM images of hydrothermal BT-NPs: (A) and (B) were before collision process,and (C)

17、 and (D) were after collision process for 3times at 0.6 MPa3.1. Dispersion of BT-NPs Figure2 shows change of cumulative mean diameter DA, of which the value represents theaverage aggregated size,