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Study on Dynamical and Optical Properties of Non-spherical Submicron Particles

非球形亚微米颗粒的动力学和光学性质研究

基本信息

批准号：
63550717
负责人：
FUKUYAMA Tsutomu
金额：
$ 1.28万
依托单位：
The National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550717/
关键词：
Non-spherical Particles Polystyrene Particles Mobility Light Scattering Differential Mobility Analyzer Dehydration Temperature Fine Crystals Droplet Sizer 非球径粒子

项目摘要

1) By dispersing a mixture of polystyrene (PS) latexes, doublets composed of different-diameter PS particles were obtained. The dynamic mobility diameters (Dm) of the doublets were determined by a differential mobility analyzer (DNA). The relation between Dm and the ratio a/b (a and b are the diameters of the larger and the smaller particles, respectively) was examined and interpreted in terms of the orientation of the doublets with respect to the electric field of DMA. It was also tried to produce particles of varying non-sphericity by heating and melting the doublets.2) Angular dependence of the scattered light intensity was measured for PS singlets and doublets. It was shown that the diameter of the singlets was determinable with precision of <plus-minus>0.005 mum by the comparison of the observed and calculated intensities. The intensities of light scattered by doublets were nearly twice as strong as those by singlets in every angle. This indicates that the incident light is scatte … More red independently by each particle constituting the doublet3) It was tried to prepare two additional samples of non-spherical particles. One of them was triangular or hexagonal fine gold crystals generated in a form of a hydrosol. The other one was PS particles with granules stuck on their surfaces, which were produced by dispersing PS latexes in which inorganic salts were dissolved.4) Dehydration temperature of inorganic fine crystals was determined on the basis of the change in their sizes. The temperature was found to be significantly lower than that for bulk crystals, thus revealing a size effect.5) A device was developed for measuring volume of individual aerosol particles, as the volume was considered to be a measure of size for particles of any shape. In this device, particles are evaporated in collision with a hot film sensor kept at constant temperature, and heat of vaporization is obtained from a change in voltage applied to the sensor. This device has wide applicability as an instrument for measuring a thermodynamical property of particles. Less

1)通过分散聚苯乙烯（PS）胶乳的混合物，得到由不同直径的PS颗粒组成的双峰。通过微分迁移率分析仪（DNA）测定双联体的动态迁移率直径（Dm）。Dm和比率a/B（a和B分别是较大和较小颗粒的直径）之间的关系被检查并根据相对于DMA的电场的双峰的取向来解释。还尝试通过加热和熔化双峰来产生不同非球形度的颗粒。2）测量了PS单线态和双峰态的散射光强度的角度依赖性。结果表明，单重态的直径是可确定的，精度为<plus-minus>0.005妈妈的观察到的和计算的强度的比较。在每个角度上，双峰散射光的强度几乎是单峰散射光的两倍。这表明入射光是散射的。 ...更多信息 3）尝试制备另外两个非球形颗粒的样品。其中之一是以水溶胶的形式生成的三角形或六边形的精细金晶体。另一种是PS颗粒，它是由溶解了无机盐的PS胶乳分散而成的。4）根据无机细晶的尺寸变化确定了无机细晶的脱水温度。发现温度显著低于块状晶体的温度，从而揭示了尺寸效应。5）开发了用于测量单个气溶胶颗粒的体积的装置，因为体积被认为是任何形状的颗粒的尺寸的量度。在该装置中，颗粒在与保持在恒定温度下的热膜传感器碰撞时蒸发，并且从施加到传感器的电压的变化获得蒸发热。该装置作为用于测量颗粒的结晶特性的仪器具有广泛的适用性。少