In Situ Observation of Ultra-fine Particles in an Aqueous Solution by Laser Induced Photoacoustic Spectroscopy
| Project/Area Number |
10640581
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
分離・精製・検出法
|
|---|
| Research Institution | TOHOKU UNIVERSITY |
|---|
Principal Investigator |
SEKINE Tsutomu Department of Chemistry, Graduate School of Science, Tohoku Univ., ASSOCIATE PROFESSOR, 大学院・理学研究科, 助教授 (20154651)
|
|---|
| Project Period (FY) |
1998 – 1999
|
| Project Status |
Completed (Fiscal Year 1999)
|
| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,200,000 (Direct Cost: ¥2,200,000)
|
|---|
| Keywords | 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 |
|---|
| Research Abstract |
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.
|
Report
(3 results)
Research Products
(11 results)
