Ultrasound directed self-assembly of non-periodic patterns of particles

超声引导非周期粒子自组装

• 批准号: 2246277
• 负责人: Bart Raeymaekers
• 金额: $ 35.45万
• 依托单位: Virginia Polytechnic Institute and State 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: 2023-08-15 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246277&HistoricalAwards=false
• 关键词: Ultrasound; directed; self; assembly; non

This award supports research into the theoretical and experimental foundation required to organize and orient particles dispersed in a fluid medium into specific patterns, using the forces associated with an ultrasound wave field. The research specifically focuses on using multi-frequency rather than single-frequency ultrasound wave fields to enable assembling arbitrary, non-periodic patterns of particles. A host of engineering applications could benefit from this research, including particle and cell separation processes, mixing and dispersion control of suspensions, non-contact particle manipulation, and manufacturing of engineered composite materials with tailored properties. Fundamental theory to optimize the parameters (amplitude, phase, and set of frequencies) to assemble any pattern of spherical particles in multiple dimensions will be developed. Broadening participation of underrepresented groups in STEM education will be promoted by partnering with the Center for Enhancement of Engineering Diversity at Virginia Tech and contributing to the Computers and Technology summer camp and the Women’s Preview Weekend.The research objective of this award is to theoretically derive and experimentally validate the scientific foundation that enables organizing and orienting particles dispersed in a fluid medium into any periodic or non-periodic pattern, utilizing the forces associated with a multi-frequency ultrasound wave field. A theoretical and experimental study will be implemented that covers four technical thrusts to solve this problem. They include: 1) derivation of multi-frequency ultrasound directed self-assembly (DSA) theory for both spherical and high aspect ratio particles, 2) experimental validation of the multi-frequency ultrasound DSA theory, 3) integration of multi-frequency ultrasound DSA with vat-polymerization AM to demonstrate proof-of-concept of manufacturing polymer matrix composite materials with tailored properties, and 4) packaging the knowledge resulting from this research in an open-source software tool to make it accessible for other users. Together, the outcomes of these four research thrusts will describe the physical underpinnings of ultrasound DSA based on multi-frequency wave fields. The results of this award will advance discovery, implementation, and deployment of external field DSA methods, and control of organization and orientation of particulates within multiphase mixtures.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.

该奖项支持利用与超声波场相关的力将分散在流体介质中的颗粒组织和定向为特定模式所需的理论和实验基础的研究，该研究特别侧重于使用多频而不是单频超声波。许多工程应用可以从这项研究中受益，包括颗粒和细胞分离过程、悬浮液的混合和分散控制、非接触式颗粒操纵以及工程复合材料的制造。材料与定制将通过与增强中心合作，开发优化参数（振幅、相位和频率组）以在多个维度上组装任何球形粒子模式的基本理论，以扩大代表性不足的群体对 STEM 教育的参与。弗吉尼亚理工大学工程多样性博士，并为计算机和技术夏令营和女性预览周末做出贡献。该奖项的研究目标是从理论上推导出并通过实验验证能够组织和指导的科学基础利用与多频超声波场相关的力，将粒子分散在流体介质中成任何周期性或非周期性图案，该研究将涵盖四个技术要点，包括： 1。 ) 推导球形和高纵横比颗粒的多频超声定向自组装 (DSA) 理论，2) 多频超声 DSA 理论的实验验证，3) 多频超声 DSA 与vat-polymerization AM 展示制造具有定制特性的聚合物基复合材料的概念验证，以及 4）将本研究产生的知识打包在开源软件工具中，以便其他用户可以共同获取结果。这四个研究重点将描述基于多频波场的超声 DSA 的物理基础。该奖项的结果将推动外场 DSA 方法的发现、实施和部署，以及多相内颗粒的组织和方向的控制。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。