Share Email Print
cover

Proceedings Paper

Re-disperse of aggregated colloidal quantum dots
Author(s): Noriyoshi Manabe; Sanshiro Hanada; Yasuhiro Futamura; Akiyoshi Hoshino; Tadafumi Adschiri; Kenji Yamamoto
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Nanoparticles, whose size is 1-100 nm, easily aggregate as their size becomes smaller. Therefore, it is difficult to produce solution in which nanoparticles are dispersed. We have, as a way to disperse aggregated particles, for example, a media-typed disperse machine. During the procedures, however, we have to deal with some complicating operations; separation of the media from the solution, the defacement of the media into the solution, and so on. Furthermore, it is not an effective method for particles whose size is less than 50 nm. We tried to find an easier and more effective method for producing solution in which we re-disperse aggregated nanoparticles to still smaller particles. The aggregated particles were put into a machine with a pinhole small needle valve, and they were re-dispersed by "sheering stress". The estimation of re-dispersion was carried out by the measurement of their size distribution and surface z-average. With the utility of the machine, the re-dispersions of aggregated particles were observed. Furthermore, the increase of the pressure and of the velocity of the flow caused the decrease of particle size, which makes the surface area larger and therefore the surface z-average larger. It become clear that it is possible to re-disperse aggregated nanoparticles by adding shearing stress. We can regulate shearing stress by controlling the pressure and flow, and therefore we can control the effectiveness and the yield.

Paper Details

Date Published: 18 February 2010
PDF: 4 pages
Proc. SPIE 7575, Colloidal Quantum Dots for Biomedical Applications V, 757514 (18 February 2010); doi: 10.1117/12.842986
Show Author Affiliations
Noriyoshi Manabe, International Clinic Research Ctr., International Medical Ctr. of Japan (Japan)
Japan Association for the Advancement of Medical Equipment (Japan)
Sanshiro Hanada, International Clinic Research Ctr., International Medical Ctr. of Japan (Japan)
Japan Association for the Advancement of Medical Equipment (Japan)
Yasuhiro Futamura, International Clinic Research Ctr., International Medical Ctr. of Japan (Japan)
Akiyoshi Hoshino, International Clinic Research Ctr., International Medical Ctr. of Japan (Japan)
Tadafumi Adschiri, Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ. (Japan)
Kenji Yamamoto, International Clinic Research Ctr., International Medical Ctr. of Japan (Japan)


Published in SPIE Proceedings Vol. 7575:
Colloidal Quantum Dots for Biomedical Applications V
Marek Osinski; Wolfgang J. Parak; Thomas M. Jovin; Kenji Yamamoto, Editor(s)

© SPIE. Terms of Use
Back to Top