CAREER: Deterministic and stochastic transport of suspended particles in periodic systems: fundamentals and applications in separation sciences.

研究目标是开发一个综合的研究和教育计划，致力于研究空间周期系统中悬浮颗粒运动中出现的复杂传输现象，以及将这些现象转化为在流体设备中操纵悬浮颗粒的新原理。其目的是建立单个粒子在单相和两相系统中空间周期系统中确定性和随机性输运的统一描述，这些基础研究将为合理设计新型微流控分离装置提供基础，这些装置超越了宏观方法的小型化，并充分利用了小尺度上的主要物理现象，如布朗运动和胶体表面相互作用。为了利用这些复杂的现象，我们将利用当前制造技术提供的优越控制来确定平面微流控器件的几何结构和表面化学。其策略是创建特定的周期模式，通过诱导对单个物种的空间分配和/或控制非线性流体动力效应，和/或通过创建选择性的表面-粒子相互作用和/或通过引导其布朗运动，来指示悬浮粒子的行为。在这个项目中，我们调查了颗粒系统中传输现象领域中的一个具有挑战性的问题。也就是说，理解具有各向异性和非均质性质的周期体系中悬浮胶体的确定性和随机性行为。对这一领域的贡献可能会对广泛的学科产生影响，从更好地了解胶体强化污染物在地下水库中的传输，到在体积平均技术等传统分析方法方面取得进展。这一结果还将影响芯片设备实验室的不断扩大，该设备实验室有望通过提供操纵悬浮物质的新方法来彻底改变化学科学。该项目将把研究和教育与开发基于网络的微流控设备中颗粒传输的虚拟实验相结合。这些实验室将让用户对工程学的最新发展有一个令人兴奋的了解。同时，这些实验室将提供一个平台，以了解交通现象中的关键概念。研究与教育相结合的第二个方面是设计简单的实验，这些实验展示了在宏观尺度上控制微流体系统中传输的基本现象。具体地说，我们正在开展由乐高积木制成的平面、透明、周期性多孔介质中钢球的沉积实验。

0954840DrazerThe research goal is to develop an integrated research and education program dedicated to investigate the complex transport phenomena that arises in the motion of suspended particles in spatially periodic systems, as well as the translation of these phenomena into new principles for the manipulation of suspended particles in fluidic devices. The objective is to develop a unified description of the deterministic and stochastic transport of individual particles as they move through spatially periodic systems in both single phase and two phase systems.The proposed fundamental studies will provide the foundations for the rational design of novel microfluidic separation devices, that go beyond the miniaturization of macroscopic methods, and fully exploit the dominant physical phenomena at small scales, such as Brownian motion and colloid surface interactions. To harness these complex phenomena we will take advantage of the superior control provided by current fabrication techniques to determine the geometrical structure and surface chemistry of planar microfluidic devices. The strategy is to create specific periodic patterns that dictate the behavior of the suspended particles by inducing spatial partitioning on individual species and/or controlling non linear hydrodynamic effects, and/or by creating selective surface-particle interactions and/or by directing their Brownian motion. In this project we investigate a challenging problem in the area of transport phenomena in particulate systems. That is, understanding the deterministic and stochastic behavior of suspended colloids in periodic systems that have anisotropic and heterogeneous properties. Contributions to this field could impact a broad range of disciplines, from a better understanding of colloid enhanced transport of pollutants in underground water reservoirs, to making progress in traditional analytical methods such as volume averaging techniques. The results will also impact the growing area of lab on a chip devices, which promises to revolutionize the chemical sciences, by providing novel methods to manipulate suspended species.The project will integrate research and education with the development of web based virtual experiments on particle transport in microfluidic devices. The labs will give the users an exciting look into state of the art developments in engineering. At the same time, the labs will provide a platform to understand key concepts in transport phenomena. A second aspect of the integration between research and education is the design of simple experiments that demonstrate the fundamental phenomena that control the transport in microfluidic systems, but at a macroscopic scale. Specifically, we are developing experiments on the sedimentation of steel balls in planar, transparent, periodic porous media fabricated from LEGO pieces.