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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Evaluating arc spray process parameters to synthesize highly spherical TiO_2 nanoparticles
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Evaluating arc spray process parameters to synthesize highly spherical TiO_2 nanoparticles

机译：评估电弧喷涂工艺参数以合成高度球形的TiO_2纳米颗粒

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摘要

This work characterizes the metal nanoparticle fabrication process using in situ nanoparticle measurement to obtain the desired geometric sphericity of nanoparticles. Without process characterization and control, the sphericity of prepared TiO_2 nanoparticles varied widely by up to 10% or more of the particle diameter. Therefore, an in situ particle sampling method was employed to collect on-line prepared particles and the particle contours were obtained by FE-SEM. They were analyzed using an image processing approach that had been developed to quantify the sphericity of TiO_2 nanoparticles. Experimental results indicate that the discharge energy parameters, including the operating temperature, vacuum pressure, pulsed peak voltage, pulsed peak current, the pulse on-time and the pulse off-time influence the particles' sphericity. The improved process parameters enhance the average sphericity of the prepared TiO_2 particles by up to 40%.
机译：这项工作表征了使用原位纳米颗粒测量获得所需纳米颗粒几何球形度的金属纳米颗粒制造过程。如果没有过程表征和控制，制得的TiO_2纳米颗粒的球形度变化幅度最大可达粒径的10％或更多。因此，采用原位颗粒采样法收集在线制备的颗粒，并通过FE-SEM获得颗粒轮廓。使用图像处理方法对它们进行了分析，该方法已被开发用来量化TiO_2纳米颗粒的球形度。实验结果表明，包括工作温度，真空压力，脉冲峰值电压，脉冲峰值电流，脉冲开启时间和脉冲关闭时间在内的放电能量参数会影响颗粒的球形度。改进的工艺参数使所制备的TiO_2颗粒的平均球形度提高了40％。

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