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Nano-rheology engineering using in-air micro-droplet technology

使用空气微滴技术的纳米流变工程

基本信息

批准号：
19360039
负责人：
SAKAI Keiji
金额：
$ 11.81万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2009
项目状态：
已结题

项目摘要

Soft condensed materials, such as liquid crystal, gel, micelle and bio systems are characterized by its organized micro-structures, which is formed in a self assembling manner. These materials are also featured by its strong response to the outer stimulation such as the change of temperature and pressure, shear deformation, and the application of the electric/magnetic field. Recently, many investigations have been carried out to realize the fabrication of soft integrated devices by using the above soft condensed materials. The purpose of this study is to establish the nano-rheoloy engineering technique which observes the dynamic process of micro fluid droplet formed and undergoing various phase transition in the air. In the study, we developed a new technique to observe the pico-litter chemical reaction through the microscopic and high speed observation of the collision of micro particles. We succeeded in explaining the proceeding of the chemical reaction in terms of the diffusion of molecules in small chemical reactors.We have also developed a new technique to fabricate a series of liquid particle with high reputation rate of 500,000 shots per our by using the spontaneous growth of the fluctuation in diameter in the one dimensional fluid system : a liquid jet continuously generated from a thin nozzle is modulated in its diameter by a piezo-driver. By observing the break-up phenomena of the fluid jet, we could successfully show that evolution in the shape of the jet provides us of the dynamic mechanical properties of the aqueous solution, such as surface tension and visco-elasticity. In conclusion, the technique developed by us in this project would be powerful tools to investigate the nanoscopic fluid physics.

液晶、凝胶、胶束、生物体系等软凝聚体材料具有自组装形成的有序微结构。这些材料还具有对外界刺激的强烈响应，如温度和压力的变化，剪切变形，以及电场/磁场的应用。最近，已经进行了许多研究以实现通过使用上述软凝聚材料制造软集成器件。本研究的目的是建立一种纳米流变学工程技术，观察微流体液滴在空气中形成和发生各种相变的动态过程。在本研究中，我们发展了一种新的技术，通过显微镜和高速观察微观粒子的碰撞来观察微微垃圾的化学反应。我们成功地用小化学反应器中分子的扩散解释了化学反应的过程，并开发了一种新技术，利用一维流体系统中直径涨落的自发增长，制造了一系列具有50万次发射率的液体粒子：从细喷嘴连续产生的液体射流在其直径上由压电驱动器调制。通过观察流体射流的破碎现象，我们可以成功地表明，射流形状的演变为我们提供了水溶液的动态力学性质，如表面张力和粘弹性。总之，我们在这个项目中开发的技术将是研究纳米流体物理的有力工具。