Scalable Capillary-Driven Assembly of Asymmetric Nanoparticles via Inkjet Printing

通过喷墨打印可扩展毛细管驱动的不对称纳米粒子组装

• 批准号: 1200385
• 负责人: Ying Sun
• 金额: $ 25万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1200385&HistoricalAwards=false
• 关键词: Scalable; Capillary; Driven; Assembly; Asymmetric

This grant provides funding for the investigation of capillary-driven self-assembly of asymmetric nanoparticles in inkjet printing of colloidal suspensions for scalable nanomanufacturing. Low-cost inkjet printing for the delivery of solution-processed functional materials onto flexible substrates has become a revolutionary technology for roll-to-roll processing of electronics and photovoltaics. However, the current technology is incapable of producing nanosized features and well-controlled patterns due to the well-known coffee-stain effect. Asymmetric nanoparticles can break the symmetry during capillary-driven self-assembly and may lead to improved feature resolution during printing. Janus nanoparticles (JNPs), which refer to colloidal particles with two regions of different surface chemical composition, will be used in this study to facilitate particle assembly due to the orientation-dependent interactions. The project that combines novel nanoparticle synthesis, multiscale modeling, in-situ observation, and advanced characterization will focus on the fundamental understanding of orientation-dependent interactions of JNPs with a moving contact line and a liquid-vapor interface away from equilibrium. If successful, the results of this research will lead to several technology advancements. Using JNPs as solid surfactants, the deposition of JNPs can be better controlled to avoid coffee-ring patterns commonly encountered in inkjet-printed structures. Using JNPs as tunable building blocks will lead to a large class of dynamically switchable micro-devices and smart surfaces. The proposed work will help establish important correlations between the assembly and deposition of JNP-based inks from evaporating colloidal drops and thin films, as well as the JNP design, ink formulations, processing conditions, and substrate properties. Such knowledge will potentially enable environmentally-benign, large-area inkjet printing, spray deposition, and slot-die coating processes for high-throughput production of next generation flexible electronics. This project will build an exciting interdisciplinary collaboration, enable new course materials, and directly benefit undergraduate researchers and K-12 teachers via Drexel?s REU and RET sites, as well as women and under-represented minority students.

该补助金为可扩展纳米制造的胶体悬浮液喷墨打印中毛细管驱动的不对称纳米颗粒自组装的研究提供资金。用于将溶液处理的功能材料递送到柔性基底上的低成本喷墨印刷已经成为电子和光电子学的卷对卷处理的革命性技术。然而，由于众所周知的咖啡污渍效应，目前的技术不能产生纳米尺寸的特征和良好控制的图案。不对称纳米颗粒可以在毛细管驱动的自组装期间打破对称性，并且可以在打印期间导致改进的特征分辨率。Janus纳米粒子（JNPs）是指具有两个不同表面化学组成区域的胶体粒子，将用于本研究中，以促进由于取向依赖性相互作用引起的粒子组装。该项目结合了新型纳米颗粒合成，多尺度建模，原位观察和高级表征，将重点关注JNPs与移动接触线和远离平衡的液-气界面的取向相关相互作用的基本理解。如果成功，这项研究的结果将导致几项技术进步。使用JNPs作为固体表面活性剂，可以更好地控制JNPs的沉积，以避免喷墨打印结构中常见的咖啡环图案。使用JNPs作为可调的构建块将导致一大类动态可切换的微型器件和智能表面。拟议的工作将有助于建立JNP为基础的油墨从蒸发胶体液滴和薄膜，以及JNP设计，油墨配方，加工条件和基板性能的组装和沉积之间的重要相关性。这些知识将有可能实现环境友好的大面积喷墨印刷，喷雾沉积和狭缝式模具涂布工艺，用于下一代柔性电子产品的高产量生产。这个项目将建立一个令人兴奋的跨学科合作，使新的课程材料，并直接受益于本科研究人员和K-12教师通过德雷克塞尔？的REU和RET站点，以及女性和代表性不足的少数族裔学生。