Controlling silicone polyHIPE materials properties with triblock copolymer surfactants: A route to bottom-up synthesis of metamaterials

用三嵌段共聚物表面活性剂控制有机硅polyHIPE材料的性能：自下而上合成超材料的途径

• 批准号: 1904518
• 负责人: Neil Ayres
• 金额: $ 34万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904518&HistoricalAwards=false
• 关键词: Controlling; silicone; polyHIPE; materials; properties

NON-TECHNICAL SUMMARY:Metamaterials are human-made materials that possess extraordinary physical properties and have been proposed for use as sound barriers, creating super-lenses of remarkable resolution, making invisibility cloaks, and other emerging areas. The objective of this research is to generate new, tailorable, metamaterials in ways that can be easily scaled up and do not rely on complex and expensive approaches. Specifically, this work will produce porous polysilicone materials and generate fundamental understanding of how the structure of polymers used to prepare the porous materials can control their performance as soft metamaterials. In addition to the expected positive impact on metamaterials research, the findings from this work will also benefit scientists studying porous materials used for biomedical and regenerative medicine applications and new silicone materials. There is also a great need for a diverse, globally engaged U.S. workforce possessing world-class skills. This workforce is expected to enhance U.S. leadership in research and education and strengthen national economic competitiveness. The activities in this proposal will include international collaborative research opportunities between the University of Cincinnati and the University of Bordeaux. This will include a trip to France for two undergraduate students from the University of Cincinnati to participate in hands-on research experiences with experts on metamaterials. The effectiveness of the international experiences will be evaluated each year and the results disseminated though conference presentations and scientific papers.TECHNICAL SUMMARY:The fabrication of metamaterials is largely achieved by top-down lithography approaches, which are difficult to scale-up. Alternatively, a bottom-up strategy to make optical and acoustic metamaterials is possible using silicone polymerized high-internal-phase emulsions (polyHIPEs). The objective of this research is to generate new, tailorable, metamaterials. The central hypothesis tested in this project is that the structure and functionality of block copolymer surfactants control the stability and properties of water-in-silicone emulsions and thus the resulting polyHIPEs, and hence the final metamaterials properties. The central hypothesis will be tested by pursuing the following specific aims: Aim 1: Determine how the porosity, storage moduli, and damping of silicone polyHIPEs control the speed of sound within the material as a result of the structure of water-in-silicone emulsions. Aim 2: Prepare polymer cross-linkers as surfactants for water-in-silicone emulsions to maintain porosity and compressibility of silicone polyHIPEs and stabilize gold nanoparticles within the polyHIPE. Accomplishment of these Aims is expected to establish how amphiphilic block polymer surfactant chemistry can be used to prepare new porous silicone polyHIPE materials. This is timely and important, as it could afford tunable, simple, and relatively cheap acoustic metamaterials for applications in imaging, cloaking, and long-wavelength noise reduction. The graduate and undergraduate students engaged in this research will be trained in polymer chemistry, materials synthesis and characterization, and will participate in international collaborative research..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.

非技术概述：超材料是一种人造材料，具有非凡的物理性能，已被建议用作声屏障，创造出分辨率非凡的超级透镜，制造隐形斗篷，以及其他新兴领域。这项研究的目标是产生新的、可定制的超材料，其方法可以很容易地放大，而不依赖于复杂和昂贵的方法。具体地说，这项工作将生产多孔性有机硅材料，并使人们对用于制备多孔性材料的聚合物的结构如何控制其作为软超材料的性能有基本的了解。除了对超材料研究产生预期的积极影响外，这项工作的发现还将有利于研究用于生物医学和再生医学应用的多孔材料和新型有机硅材料的科学家。此外，对拥有世界级技能的多元化、参与全球事务的美国劳动力的需求也很大。这些劳动力预计将增强美国在研究和教育方面的领导地位，并增强国家经济竞争力。该提案中的活动将包括辛辛那提大学和波尔多大学之间的国际合作研究机会。这将包括辛辛那提大学的两名本科生前往法国，与超材料专家一起参加实践研究经验。每年将对国际经验的有效性进行评估，并通过会议报告和科学论文传播结果。技术摘要：超材料的制造主要是通过自上而下的光刻方法实现的，这种方法很难放大。或者，使用有机硅聚合高内相乳液(PolyHIPE)，可以采用自下而上的策略来制造光学和声学超材料。这项研究的目标是产生新的、可定制的超材料。本项目检验的中心假设是，嵌段共聚表面活性剂的结构和官能度控制硅油乳液的稳定性和性能，从而生成多HIPE，从而控制最终的超材料性能。中心假设将通过追求以下具体目标来验证：目标1：确定由于硅油乳状液的结构，有机硅聚HIPE的孔隙率、存储模数和衰减如何控制材料中的声速。目的2：制备聚合物交联剂作为有机硅水乳剂的表面活性剂，以保持有机硅聚HIPE的孔隙率和可压缩性，并稳定聚HIPE中的金纳米粒子。这些目标的实现有望确定如何利用两亲性嵌段聚合物表面活性剂化学来制备新型多孔有机硅聚HIPE材料。这是及时而重要的，因为它可以提供可调的、简单的、相对便宜的声学超材料，用于成像、隐身和长波长降噪应用。从事这项研究的研究生和本科生将接受聚合物化学、材料合成和表征方面的培训，并将参与国际合作研究。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Mechanically tunable PDMS-based polyHIPE acoustic materials

• DOI: 10.1039/d2tc00136e
• 发表时间: 2022
• 期刊: Journal of Materials Chemistry C
• 影响因子: 6.4
• 作者: Tucker J. McKenzie;K. Rost;S. Smail;O. Mondain-Monval;T. Brunet;N. Ayres

Multi-layered polymerized high internal phase emulsions with controllable porosity and strong interfaces

具有可控孔隙率和强界面的多层聚合高内相乳液

• DOI: 10.1016/j.polymer.2021.124116
• 发表时间: 2021
• 期刊: Polymer
• 影响因子: 4.6
• 作者: McKenzie, Tucker J.;Smail, Soren;Rost, Kathryn;Rishi, Kabir;Beaucage, Gregory;Ayres, Neil
• 通讯作者: Ayres, Neil

Storage Moduli and Porosity of Soft PDMS PolyMIPEs Can Be Controlled Independently Using Thiol–Ene Click Chemistry

使用硫醇-烯点击化学可以独立控制软 PDMS PolyMIPE 的储能模量和孔隙率

• DOI: 10.1021/acs.macromol.0c00217
• 发表时间: 2020
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: McKenzie, Tucker J.;Heaton, Paul S.;Rishi, Kabir;Kumar, Raj;Brunet, Thomas;Beaucage, Gregory;Mondain-Monval, Olivier;Ayres, Neil
• 通讯作者: Ayres, Neil

Open-cell PDMS polyHIPEs prepared using polymethylvinylsiloxane to prevent pore collapse

• DOI: 10.1016/j.polymer.2023.125787
• 发表时间: 2023-02
• 期刊: Polymer
• 影响因子: 4.6
• 作者: Anthony Smith;N. Ayres