Collaborative Research: Electrotunable and Curvature-Dependent Friction at Nanoscale Contacts Lubricated by Ionic Liquids

合作研究：离子液体润滑纳米级接触处的电可调和曲率相关摩擦

• 批准号: 2216256
• 负责人: Rui Qiao
• 金额: $ 29.12万
• 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: 2023-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2216256&HistoricalAwards=false
• 关键词: Collaborative; Research; Electrotunable; Curvature; Dependent

Effective friction control is crucial in manufacturing processes: in macroscale manufacturing, minimizing friction helps lower costs; in micro-manufacturing and ultra-high precision manufacturing, friction control often determines the quality and functionalities of finished products. This project aims to explain how ionic liquids lubricate single-point contacts between dielectric and conducting surfaces, and to investigate how the friction can be tuned using electrical potential between the surfaces. The research will be conducted by integrating atomic force microscopy experiments and molecular modeling. The mechanistic insight gained in this project will help improve the design of new ionic liquid lubricants and additives. This progress will help improve the sustainability and efficiency of manufacturing processes and thus increase U.S. industrial productivity and competitiveness. Furthermore, the collaborative project will help develop the workforce in the US, broaden the participation of underrepresented groups in research, and positively impact engineering education and the dissemination of research to industry.This project will determine the relationship between surface curvature, surface potential, and friction at single-asperity contacts mediated by ionic liquids. Model systems consisting of atomic force microscopy tips and nanoparticle-decorated substrates coated with durable single-layer graphene will be adopted to quantify the effects of surface roughness and potential on lubrication. Rigorous molecular simulations, in which electrical potentials are imposed on conducting surfaces, will resolve ionic liquids' molecular structure and dynamics in nanoscale tribosystems to elucidate the mechanisms underlying electrotunable friction. Molecular modeling and atomic force microscopy experiments will be used in a complementary manner and at accessible length scales to enable the molecular understanding of friction. The fundamental insights on the modulation of lubrication by surface roughness and electrical potential at single-asperity contacts will provide the theoretical underpinning for understanding how tribological behaviors depend on choices of ionic liquids and surfaces.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.

有效的摩擦控制对于制造过程至关重要：在宏观制造中，最大程度地减少摩擦有助于降低成本；在微型制造和超高精度制造中，摩擦控制通常决定成品的质量和功能。该项目的目的是解释离子液体如何在介电和导电表面之间润滑单点接触，并研究如何使用表面之间的电势调整摩擦。该研究将通过整合原子力显微镜实验和分子建模来进行。该项目获得的机械洞察力将有助于改善新的离子液体润滑剂和添加剂的设计。这一进展将有助于提高制造过程的可持续性和效率，从而提高美国的工业生产力和竞争力。此外，该协作项目将有助于发展美国的劳动力，扩大代表性不足的群体的参与，并对工程教育产生积极影响，并将研究传播给行业。该项目将确定表面曲率，表面电位和在单个耐受性接触中介导的摩擦之间的关系。将采用由原子力显微镜尖端和涂有耐用单层石墨烯涂层的纳米颗粒装饰底物组成的模型系统，以量化表面粗糙度和潜力对润滑的影响。严格的分子模拟，其中将电势施加在进行表面上，它将在纳米级的托架系统中解决离子液体的分子结构和动力学，以阐明可电摩擦的机制。分子建模和原子力显微镜实验将以互补的方式和可访问的长度尺度使用，以使分子理解摩擦。对单份接触时的表面粗糙度和电势调节润滑调节的基本见解将为理论基础，以理解摩擦学行为如何取决于离子液体和表面的选择。该奖项反映了NSF的法定任务，反映了通过使用基金会的智能构成和广泛的影响，并通过评估了支持。