Collaborative Research: Designer Microstructures by Additive Manufacturing of Functional Emulsions

合作研究：通过功能乳液增材制造设计微结构

• 批准号: 2054411
• 负责人: Eric Markvicka
• 金额: $ 35.43万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2054411&HistoricalAwards=false
• 关键词: Collaborative; Research; Designer; Microstructures; Additive

Functional emulsions are an emerging material architecture for creating highly functional elastomer composites that are soft and elastically deformable. However, techniques to control local composition and microstructure of the composite material in emulsions, which ultimately govern material properties and performance of the cured elastomer composite, are lacking. This award supports fundamental research to develop an additive manufacturing technique to control liquid inclusion microstructure in emulsions to achieve unprecedented combinations of thermal, electrical, and mechanical functionalities in elastomer composites. By developing the material and manufacturing knowledge to program inclusion microstructure, new paradigms in composite architecture for next generation functional materials are enabled leading to new applications in electronics and robotics, which benefits the U.S. economy and society. Through a collection of ‘behind the research’ videos generated by team members and a manufacturing workshop for 9-12 grade students, the project provides inspiration and training for future leaders in the emerging fields of additive manufacturing and soft robotics. This project is jointly funded by the Advanced Manufacturing (AM) program and the Established Program to Stimulate Competitive Research (EPSCoR).This project establishes the processing-structure-property relationships of additively manufactured functional emulsions that can be cured into an elastomer composite of complex geometry. This is achieved by creating model emulsion inks, processing methods, and in-situ process monitoring to determine how material composition and printing conditions influence material microstructure. These fundamental processing and material insights are combined with new theoretical models for emulsion extrusion to predict the microstructure of liquid phase inclusions throughout a manufactured part. Liquid metal and glycerol liquid phase inclusions are examined as they present distinctly different fundamental properties, but both offer broad applicability in the field of soft matter engineering. In contrast to rigid carbon black, copper, or silica particle fillers that have fixed shape and size, the on-demand control of liquid inclusion morphology via direct ink write processing provides a new and efficient method to manufacture elastomeric composites. During the manufacturing process, the local material composition and liquid inclusion microstructure are actively tailored to control the electrical, thermal, and mechanical properties of elastomeric composites. By combining printing ink properties and process control with tool design and modeling this work provides new fundamental knowledge to create scalable manufacturing strategies for processing emulsions. This leads to novel model material systems with programmable processing-structure-property relationships to determine physics-based properties of multi-component soft matter.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.

功能性乳液是一种新兴的材料结构，用于制造柔软且可弹性变形的高功能弹性体复合材料。然而，缺乏控制乳液中复合材料的局部组成和微观结构的技术，其最终控制固化弹性体复合材料的材料性质和性能。该奖项支持基础研究开发增材制造技术，以控制乳液中的液体夹杂物微观结构，从而在弹性体复合材料中实现前所未有的热，电和机械功能组合。通过开发材料和制造知识来编程夹杂物微观结构，实现了下一代功能材料复合结构的新范例，从而导致电子和机器人技术的新应用，这有利于美国经济和社会。通过收集团队成员制作的“研究背后”视频，以及为9-12年级学生举办的制造研讨会，该项目为增材制造和软机器人等新兴领域的未来领导者提供了灵感和培训。该项目由先进制造（AM）计划和刺激竞争力研究的既定计划（EPSCoR）联合资助。该项目建立了增材制造功能乳液的工艺-结构-性能关系，该乳液可固化成复杂几何形状的弹性体复合材料。这是通过创建模型乳液油墨、加工方法和现场过程监控来实现的，以确定材料成分和印刷条件如何影响材料微观结构。这些基本的加工和材料见解与新的理论模型相结合，用于乳液挤出，以预测整个制造部件中液相夹杂物的微观结构。液态金属和甘油液相夹杂物进行检查，因为它们呈现出明显不同的基本属性，但都提供了广泛的适用性，在软物质工程领域。与具有固定形状和尺寸的刚性炭黑、铜或二氧化硅颗粒填料相比，通过直接墨写加工按需控制液体内含物形态提供了一种制造弹性体复合材料的新的有效方法。在制造过程中，局部材料成分和液体夹杂物微观结构被主动定制，以控制弹性体复合材料的电、热和机械性能。通过将印刷油墨特性和过程控制与工具设计和建模相结合，这项工作提供了新的基础知识，以创建用于加工乳液的可扩展制造策略。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，被认为值得支持。

项目成果

On‐Demand Programming of Liquid Metal‐Composite Microstructures through Direct Ink Write 3D Printing (Adv. Mater. 20/2022)

通过直接墨水写入 3D 打印对液态金属进行按需编程——复合微结构（Adv. Mater. 20/2022）

• DOI: 10.1002/adma.202270163
• 发表时间: 2022
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: Haake, Aaron;Tutika, Ravi;Schloer, Gwyneth M.;Bartlett, Michael D.;Markvicka, Eric J.
• 通讯作者: Markvicka, Eric J.