Effects of Photothermal Conversion on the Laser-Photophoresis of Micro-Particles in Liquid Media.

光热转换对液体介质中微粒激光电泳的影响。

基本信息

批准号：
15350042
负责人：
MONJUSHIRO Hideaki
金额：
$ 8.26万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Laser-Photophoresis is a promising technique to migrate and to separate microparticles in liquid media. However, the effect of photothermal conversion on the photophoretic behavior of photo-absorbing microparticles is still ambiguous. In this research project, we have made the following studies to elucidate the effect of photothermal effects on the laser-photophoretic migration of microparticles. 1. Laser Photophoretic Migration with Periodic Expansion-Contraction Motion of Photo-Absorbing Microemulsion Droplets in Water. : It was elucidated that the origin of the motion is photothermal conversion and the mechanism of the periodic expansion-contraction motion is consisted of three steps. 2. Temperature Distribution in the Laser-Irradiated Droplet in Water. : The temperature of the front-side of the irradiated droplet is higher than that of the back-side of the droplet. This temperature distribution results in the reverse photophoresis. 3. Separation of Blood Cells by Laser-Photophoresis. : We proposed the method for the photophoretic separation of red blood cells and white blood cells. 4. Formation and Trapping of Bubbles in the Organic Solvents. We found new phenomena that the laser induces the formation of bubble in organic solvents and the bubble can be trapped by the laser beam. 5. Photophoretic behaviors of water droplets and aqueous solution droplets in organic solvents. : It was found that water absorbs 1064 nm laser light and this causes complex photophoretic behavior of aqueous droplets in organic solvents. These behaviors cannot be explained by the simple Mie scattering model

激光电泳是一种很有前景的在液体介质中迁移和分离微粒的技术。然而，光热转换对光吸收微粒的发光行为的影响仍然不明确。在本研究项目中，我们进行了以下研究来阐明光热效应对微粒激光光泳迁移的影响。 1. 水中光吸收微乳液液滴周期性膨胀-收缩运动的激光光迁移。：阐明了运动的起源是光热转换，周期性膨胀-收缩运动的机制由三个步骤组成。 2. 水中激光照射液滴的温度分布。：被照射的液滴的正面的温度比液滴的背面的温度高。这种温度分布导致反向电泳。 3. 通过激光电泳分离血细胞。：我们提出了红细胞和白细胞的电泳分离方法。 4. 有机溶剂中气泡的形成和捕获。我们发现了新现象：激光诱导有机溶剂中形成气泡，并且气泡可以被激光束捕获。 5、水滴和水溶液滴在有机溶剂中的发光行为。：发现水吸收 1064 nm 激光，这会导致水滴在有机溶剂中出现复杂的发光行为。这些行为无法用简单的米氏散射模型来解释