Size Classification of Au Nanometer-sized Particles by DMA and Their Application as a Catalyst

DMA 对金纳米粒子的尺寸分类及其作为催化剂的应用

• 批准号: 13650824
• 负责人: KUGA Yoshikazu
• 金额: $ 2.24万
• 依托单位: MURORAN INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650824/
• 关键词: differential mobility analyzer (DMA); gold particles; nanometer sized particles; catalyst; size classification; gas phase; Transmission electron microscope; TEM

Au nanometer-sized particles were generated by evaporation-condensation method, and their particles size distributions were measured by a Differential Mobility Analyzer (DMA) system. As a result of raising the Au particles generator temperature from 1000 to 1100 ℃, the generation of Au particles with 1.7 nm to 3.5 nm in size was experimentally confirmed. Good correlation was obtained when we compared the mean diameter D_<m,TEM> which was calculated from the TEM observation of particles with the D_<DMA> which was DMA targeted size. Consequently, we concluded that our DMA system was available to classification of the nanometer-sized particles. As application as a catalyst, we confirmed the generation of Au nanometer-sized particles ranging from 1.7 to 10 nanometers in size which might show high catalytic activity. The size distribution of these particles was controlled by changing the furnace temperature, although the particle concentration decreased with the decrease in the furnace temperature. The morphology of Au particles was found to be not spherical from the TEM observation. In order to generate the spherical Au nanoparticles, we installed reheating furnace between the outlet of particle generator and the aerosol charger, It was experimentally confirmed that shape of Au particles with 4.3 nm in size tended to be sphere by this processing. The catalytic performance of thus treated Au nanometer size-selected particles are now under way.

采用蒸发-冷凝法制备了Au纳米粒子，并利用微分迁移率分析仪（DMA）测量了其粒径分布。通过将Au粒子发生器温度从1000 ℃提高到1100 ℃，实验证实了尺寸为1.7 nm到3.5 nm的Au粒子的产生。当我们比较由颗粒的TEM观察计算的平均直径D_&lt;m，TEM&gt;与DMA目标尺寸D_时，获得了良好的相关性<DMA>。因此，我们得出结论，我们的DMA系统是可用的纳米级颗粒的分类。作为催化剂的应用，我们证实了Au纳米尺寸颗粒的产生，其尺寸范围为1.7至10纳米，这可能显示出高催化活性。这些颗粒的尺寸分布是通过改变炉温来控制的，尽管颗粒浓度随着炉温的降低而降低。从TEM观察发现Au颗粒的形态不是球形的。为了制备球形Au纳米粒子，我们在粒子发生器出口和气溶胶充电器之间安装了再加热炉，实验证实，通过这种工艺，尺寸为4.3 nm的Au粒子的形状趋于球形。这样处理的Au纳米尺寸选择颗粒的催化性能现在正在进行中。

项目成果

T.Fujimoto, Y.Kuga, S.E.Pratsinis, K.Okuyama: "Unipolar Ion Charging and Coagulation during Aerosol Formation by Chemical Reaction"Powder Technology. (印刷中). (2003)

T.Fujimoto、Y.Kuga、S.E.Pratsinis、K.Okuyama：“化学反应形成气溶胶期间的单极离子充电和凝结”粉末技术（2003 年）。

T. Fujimoto, Y. Kuga, S. E. Pratsinis, K. Okuyama: "Unipolar Ion Charging and Coagulation during Aerosol Formation by Chemical Reaction"Powder Technology. in press. (2003)

T. Fujimoto、Y. Kuga、S. E. Pratsinis、K. Okuyama：“化学反应形成气溶胶过程中的单极离子充电和凝结”粉末技术。

Y.Kuga, T.Fujimoto, A.Funabiki, D.Takeda: "Penetration of nanometer-sized particles through a laminar flow tube under low-pressure conditions"Proceedings of the 15th International Congress of Chemical and Process Engineering (CHISA 2002). CD ROM. 4.01 (20

Y.Kuga、T.Fujimoto、A.Funabiki、D.Takeda：“低压条件下纳米尺寸颗粒穿过层流管的渗透”第 15 届国际化学与过程工程大会论文集 (CHISA 2002)。

T.Fujiimoto, Y.Kuga, S.E.Pratsinis, K.Okuyama: "Unipolar Ion Charging and Coagulation during Aerosol Formation by Chemical Reaction"Powder Technology. (印刷中). (2003)

T.Fujiimoto、Y.Kuga、S.E.Pratsinis、K.Okuyama：“化学反应形成气溶胶期间的单极离子充电和凝结”粉末技术（2003 年）。

Y.Kuga, T.Fujimoto, A.Funabiki, D.Takeda: "Penetration of nanometer-sized particles through a laminar flow tube under low-pressure conditions"Proceedings of the 15th International Congress of Chemical and Process Engineering (CHISA 2002). (CD ROM). 4.01-1

Y.Kuga、T.Fujimoto、A.Funabiki、D.Takeda：“低压条件下纳米尺寸颗粒穿过层流管的渗透”第 15 届国际化学与过程工程大会论文集 (CHISA 2002)。