Measuring the non-uniform surface interactions experienced by a Janus particle

测量 Janus 粒子经历的非均匀表面相互作用

• 批准号: 2314405
• 负责人: Christopher Wirth
• 金额: $ 35万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2314405&HistoricalAwards=false
• 关键词: Measuring; non; uniform; surface; interactions

Janus particles are small particles that are measured in micrometers and have a non-uniform surface chemistry. They have the potential to revolutionize many technologies, including defense applications, understanding microorganisms' behavior in nature, and improving human health by serving as micrometer scale cargo carriers. The primary challenge this award aims to address is understanding how Janus particles interact with boundaries, which is relevant to each of these applications. To achieve this goal, the project team plans to use a unique microscope to study these interactions. Additionally, the team will investigate how Janus particles use chemical signals to navigate when they are near a boundary. Further, they aim to standardize and disseminate educational modules based on colloidal and interfacial phenomena, which is a fundamental concept explored during this work.Over the past decade, Janus particles have emerged as a promising type of anisotropic particle with potential applications in various technological fields. The main goal of this award is to accurately measure the non-uniform surface interactions of both active and non-active Janus particles near a boundary. To achieve this objective, the proposed work will leverage a recently developed tool called Scattering Morphology Resolved Total Internal Reflection Microscopy (SMR-TIRM) to investigate the interactions and dynamics of Janus particles. The approach involves mapping the scattering from Janus particles at different azimuthal angles and then using this information to track the position and orientation of a mobile Janus particle. Despite recent progress in understanding these complex materials, significant questions remain about their dynamics. This award aims to address two of these questions related to the non-uniform interactions experienced by a Janus particle in the presence and absence of self-propulsion. To answer these questions, it is crucial to monitor the Janus particle dynamics and infer the surface forces that the particle experiences. In particular, the project team will conduct these measurements in the presence and absence of chemical fuel, which a catalytic Janus particle uses to generate a mechanical force.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

Janus颗粒是以微米测量的小颗粒，具有不均匀的表面化学性质。它们有可能彻底改变许多技术，包括国防应用，了解微生物在自然界中的行为，以及通过充当微米级货物载体来改善人类健康。该奖项旨在解决的主要挑战是理解Janus粒子如何与边界相互作用，这与这些应用中的每一个都相关。为了实现这一目标，项目团队计划使用一种独特的显微镜来研究这些相互作用。此外，该团队还将研究Janus粒子在边界附近如何使用化学信号进行导航。此外，他们的目标是标准化和传播基于胶体和界面现象的教育模块，这是在这项工作中探索的一个基本概念。在过去的十年中，Janus粒子已经成为一种有前途的各向异性粒子，在各个技术领域具有潜在的应用。该奖项的主要目标是精确测量边界附近活动和非活动Janus粒子的非均匀表面相互作用。为了实现这一目标，拟议的工作将利用最近开发的称为散射形态分辨全内反射显微镜（SMR-TIRM）的工具来研究Janus粒子的相互作用和动力学。该方法涉及映射不同方位角的Janus粒子的散射，然后使用此信息来跟踪移动的Janus粒子的位置和方向。尽管最近在理解这些复杂材料方面取得了进展，但关于它们的动力学仍然存在重大问题。该奖项旨在解决其中两个与Janus粒子在存在和不存在自推进时所经历的非均匀相互作用有关的问题。为了回答这些问题，至关重要的是监测Janus粒子动力学并推断粒子所经历的表面力。特别是，该项目团队将在存在和不存在化学燃料的情况下进行这些测量，催化Janus粒子用于产生机械力。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估而被认为值得支持。