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 - 遗传学是一种在液体培养基中迁移和分离微粒的有前途的技术。然而，光热转化对吸收照片微粒的光体行为的影响仍然模棱两可。在这项研究项目中，我们进行了以下研究，以阐明光热影响对微粒激光粒子迁移的影响。 1。激光照射迁移，随着水中的光乳液吸收液滴的周期性膨胀 - 收集运动。：阐明了运动的起源是光热转化，周期性膨胀征收运动的机制包括三个步骤。 2。在水中激光辐照的液滴中的温度分布。：辐照液滴的前侧温度高于液滴的背面的温度。该温度分布导致反向光体。 3。通过激光 - 遗传学分离血细胞。：我们提出了红细胞和白细胞的光体分离的方法。 4。有机溶剂中气泡的形成和捕获。我们发现新现象是激光诱导有机溶剂中气泡的形成，并且气泡可能被激光束捕获。 5。有机溶剂中的水滴和水溶液液滴的光性行为。：发现水吸收了1064 nm激光，这会导致有机溶剂中水滴的复杂的照射行为。这些行为无法通过简单的MIE散射模型来解释