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

研究目标是建立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粒子运动中出现的复杂输运现象，以及将这些现象转化为流体装置中悬浮粒子操纵的新原理。目标是对单个粒子在单相和两相系统中穿越空间周期系统时的确定性和随机输运进行统一描述。所提出的基础研究将为合理设计新型微流体分离装置提供基础，超越宏观方法的小型化，充分利用布朗运动和胶体表面相互作用等小尺度的主导物理现象。为了控制这些复杂的现象，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体装置的几何结构和表面化学。该策略是创建特定的周期模式，通过诱导单个物种的空间划分和/或控制非线性流体动力效应，和/或通过创建选择性表面粒子相互作用和/或通过指导它们的布朗运动来指示悬浮粒子的行为。在这个项目中，我们研究了微粒系统中输运现象领域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相性质的周期性系统中悬浮胶体的确定性和随机行为。对这一领域的贡献可以影响广泛的学科，从更好地了解胶体增强地下水库中污染物的运输，到在传统的分析方法如体积平均技术方面取得进展。该研究结果还将影响芯片实验室设备的发展领域，通过提供操纵悬浮物种的新方法，有望彻底改变化学科学。该计划将整合研究与教育，并发展基于网络的微流控装置粒子输运虚拟实验。这些实验室将让用户对工程技术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来理解传输现象中的关键概念。研究与教育结合的第二个方面是设计简单的实验，这些实验可以在宏观尺度上展示控制微流体系统中传输的基本现象。具体来说，我们正在进行钢球在由乐高积木制成的平面、透明、周期性多孔介质中的沉降实验。

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.