In Situ Observation of Ultra-fine Particles in an Aqueous Solution by Laser Induced Photoacoustic Spectroscopy

激光诱导光声光谱原位观察水溶液中的超细颗粒

• 批准号: 10640581
• 负责人: SEKINE Tsutomu
• 金额: $ 1.98万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640581/
• 关键词: ULTRA-FINE PARTICLES; PHOTOACOUSTIC SPECTROSCOPY; TECHNETIUM COLLOID; INTERACTION CROSS SECTION OF LIGHT; COLLISION-COAGULATION MODEL; 衝突凝集モデル; 金コロイド; ポリスチレン微粒子; テクネチウム コロイド

Laser induced photoacoustic spectroscopy (LPAS) was successfully applied to a study on colloid formation processes and coagulation processes. The photoacoustic signal intensity was linearly correlated to a product of the number of particles in a unit volume and light absorption cross section of one particle. This relationship was quantitatively confirmed by using gold sols (2 - 20 nm), silver sols (5 - 20 nm), polystyrene particles (100 - 2800 nm), α-FeィイD22ィエD2OィイD23ィエD2 particles (80 - 130 nm) and Tc(IV) colloids (200 - 700 nm). The LPAS method employed here is applicable to examining the colloid formation and coagulation processes with a wide range of particle size from nanometer to micrometer. The present method was useful for the determination of a refractive index of particles suspended even in a liquid medium. Furthermore, the growth of Tc(IV) colloid particles was found to proceed through coagulation of small particles and it was successfully analyzed by applying a newly developed collision-coagulation model in which the coagulation took place between two small particles whose kinetic energy was larger than the potential barrier.

激光诱导光声光谱（LPAS）已成功应用于胶体形成过程和凝固过程的研究。光声信号强度与单位体积中的颗粒数量和一个颗粒的光吸收截面的乘积线性相关。通过使用金溶胶（2 - 20 nm）、银溶胶（5 - 20 nm）、聚苯乙烯颗粒（100 - 2800 nm）、α-FeィイD22ィエD2OィイD23ィエD2颗粒（80 - 130 nm）和Tc（IV）胶体（200 - 700 nm）定量证实了这种关系。这里采用的LPAS方法适用于检查从纳米到微米的各种粒径的胶体形成和凝聚过程。本方法可用于测定悬浮在液体介质中的颗粒的折射率。此外，发现Tc(IV)胶体颗粒的生长是通过小颗粒的凝聚进行的，并通过应用新开发的碰撞凝聚模型成功地进行了分析，其中凝聚发生在两个动能大于势垒的小颗粒之间。

项目成果

T. Sekine, M. Konishi, H. Kudo, K. Tagami, S. Uchida: "Separation of Carrier Free ィイD195mィエD1Tc from Niobium Targets Irradiated with Alpha-Particles"J. Radioanal. Nucl. Chem.. 239. 483-487 (1999)

T. Sekine、M. Konishi、H. Kudo、K. Tagami、S. Uchida：“用 α 粒子照射的铌靶材的分离”J. Radioanal。 ）

T.Sekine: "Laser-Induced Photoacoustic Spectroscopy Applied to a Study on Colloid Formation Processes"Radiochim. Acta. 82. 135-139 (1998)

T.Sekine：“激光诱导光声光谱应用于胶体形成过程的研究”Radiochim。

T.Sekine: "Separation of Carrier free ^<95m>Tc from Niobium Targets Irradiated with α-particles"J. Radioanal .Nucl. Chem. 239. 483-487 (1999)

T.Sekine：“用 α 粒子照射的铌靶材中的无载体 ^<95m>Tc 的分离”J.Radioanal.Nucl。

T.Sekine: "Laser Induced Photoacoustic Spectroscopy Applied to a Study on Colloid Formation Processes"Radiochim. Acta. 82. 135-139 (1998)

T.Sekine：“激光诱导光声光谱应用于胶体形成过程的研究”Radiochim。

S.Naito: "Formation of Tc(IV) Colloids and Coagulation Processes"Radiochim. Acta. 82. 129-132 (1998)

S.Naito：“Tc(IV) 胶体的形成和凝固过程”Radiochim。