Collaborative Research: Dynamic Clustering and Rheology of Magnetic Janus Particles with Shifted Dipoles

合作研究：偶极子移动的磁性 Janus 粒子的动态聚类和流变学

• 批准号: 1705656
• 负责人: Ubaldo Cordova
• 金额: $ 18.96万
• 依托单位: University of Puerto Rico Mayaguez
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1705656&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamic; Clustering; Rheology; Collaborative; Research; Dynamic; Clustering; Rheology

The goal of the project is to engineer the flowability of a fluid, i.e., the ease with which a fluid flows, by addition of active magnetic particles with unique magnetic properties. These particles can be manipulated by a combination of an external magnetic field and an internal chemical gradient. Fluids with varying flowability are important for common technologies, such as printers, fluid shock absorbers, fluid property sensors, biomedical devices, and body armor. Control of the flowability will enable longer lifetimes, broader applicability, reduced cost, and increased stability of the fluids and devices. The proposed research will investigate the assembly properties of active magnetic colloids using experimental and computational techniques. Additional benefits of these studies are the creation of a toolbox for the design of fluids that have their flowability tailored to a particular application. The research addresses the need for an in-depth understanding of the assembly behavior of active magnetic Janus particles with shifted dipoles. In systems with shifted dipoles, the magnetic dipole axis is shifted away from the center of mass of the particle, thereby providing additional control over particle orientation and response. In combination with on-board propulsion, particles with shifted dipoles represent a new and exciting class of active materials. The research described will advance our understanding of magnetic particle interaction, active matter, and the rheology of complex magnetic fluids. This work will enable future studies in which, for example, Brownian Dynamics simulations are used to predict long-time dynamics and to discover novel structures that are difficult to accomplish or detect experimentally. More broadly, research described in the proposal will advance our understanding of the intrinsic role of forces and torques in the structure of complex fluids, thus providing important insights into the statistical physics of out-of-equilibrium systems and enabling researchers to better engineer and utilize many body dynamics in the microscopic regime. The educational goals of this proposal will leverage the collaborative environment between the two participating institutions to enhance student education at various stages and thereby strengthen the diversity of the STEM workforce pipeline.

该项目的目的是通过添加具有独特磁性特性的主动磁性颗粒来设计流体流动的流动性，即流体流动的易感性。这些颗粒可以通过外部磁场和内部化学梯度的组合来操纵。具有不同流动性的流体对于常见技术很重要，例如打印机，流体减震器，流体特性传感器，生物医学设备和身体装甲。控制流动性将使寿命更长，更广泛的适用性，降低的成本以及提高流体和设备的稳定性。拟议的研究将使用实验和计算技术研究主动磁胶体的组装特性。这些研究的其他好处是创建一个工具箱，用于设计具有针对特定应用的流动性的设计。 该研究解决了对具有转移偶极子的主动磁性janus颗粒的组装行为的深入了解。在具有偏移偶极子的系统中，磁偶极子轴从粒子的质量中心转移，从而提供了对粒子方向和响应的额外控制。结合板载推进，带有转移偶极子的颗粒代表了一种新的令人兴奋的活性材料类。所描述的研究将提高我们对磁性颗粒相互作用，活性物质和复杂磁流体的流变学的理解。这项工作将实现未来的研究，例如，布朗动力学模拟用于预测长期动力学，并发现难以实现或检测实验的新结构。更广泛地说，该提案中描述的研究将提高我们对力和扭矩在复杂流体结构中的内在作用的理解，从而为不平衡系统的统计物理学提供重要的见解，并使研究人员能够更好地工程师并利用微观制度中的许多身体动力学。该提案的教育目标将利用两个参与机构之间的协作环境，在各个阶段增强学生教育，从而加强STEM劳动力管道的多样性。