Controlling Friction and Adhesion Using Charged Hydrogel Lubricants During Manufacturing

在制造过程中使用带电水凝胶润滑剂控制摩擦和粘附

• 批准号: 2121681
• 负责人: Rosa Espinosa-Marzal
• 金额: $ 42.61万
• 依托单位: University of Illinois at Urbana-Champaign
• 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=2121681&HistoricalAwards=false
• 关键词: Controlling; Friction; Adhesion; Using; Charged

This grant supports research that contributes new knowledge related to lubrication in manufacturing processes, promoting both the progress of science and advancing national prosperity. Oil-based lubricants generate pollutants and harmful contaminants and, thus, there is a demand for environmentally benign lubricants that are renewable and, at least, as efficient. While lubrication in an aqueous medium could solve this need, it is rarely applied in manufacturing due to the low pressure-coefficient of the viscosity of water, among other reasons. In biological tribosystems like cartilage, these challenges are met by employing gel-assisted aqueous lubrication. Thus inspired, this project designs synthetic waterborne films with charged hydrogel-like structures that enable the active control of friction and adhesion during manufacturing. Active control of hydrogel lubrication not only ensures good manufacturing practices in food, biomedical and pharmaceutical industries, low-carbon footprint and tunable lubrication of machine components, but also enables handling of soft biologically inspired materials and delicate electronic components during manufacturing. Furthermore, the knowledge derived from this research allows machine interfaces to dynamically adapt to their current task, which increases machine versatility, efficiency and product quality. Therefore, results from this research benefit the U.S. economy and society and help to extend U.S. manufacturing to new application areas. The multi-disciplinary approach helps broaden participation of women and underrepresented minority students in research and positively impacts engineering education.This research produces fundamental knowledge on active control of hydrogel-based lubrication via electrical modulation. In particular, the project determines how modulating the balance between physical interactions in three hydrogel systems, (1) electrostatic attraction vs. repulsion, (2) hydrogen bonding vs. electrostatic repulsion, and (3) hydrophobic attraction vs. electrostatic repulsion), dictates the self-assembly pathway and microstructure, and how this can be applied to modulate lubrication. These lubricants are synthesized via microphase separation. The experimental studies combine microscopy, oscillatory shear and normal and lateral force measurements with polymer physics-based models to deliver understanding of the role played by physical associations in the interfacial structure and rheology and how they influence friction and adhesion. This research also advances the knowledge about how chemical and electrical stimulation drives changes in friction and adhesion mechanisms. The new knowledge includes breakthroughs in discovery of hydrogel lubrication mechanisms enabled by the integration of novel and improved experimental and modeling toolsets, novel design rules for responsive hydrogels with control over the structure-property relationships, and a framework to predict the friction coefficient as a function of the operating conditions and hydrogel composition.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.

该补助金支持的研究，有助于在制造过程中与润滑相关的新知识，促进科学进步和促进国家繁荣。油基润滑剂产生污染物和有害污染物，因此，需要可再生的并且至少同样有效的环境友好的润滑剂。虽然水介质中的润滑可以解决这一需求，但由于水的粘度的低压力系数等原因，它很少应用于制造业。在生物摩擦系统如软骨中，这些挑战通过采用凝胶辅助水性润滑来满足。受此启发，该项目设计了具有带电水凝胶状结构的合成水性薄膜，能够在制造过程中主动控制摩擦和粘附力。水凝胶润滑的主动控制不仅确保了食品、生物医学和制药行业的良好制造实践、低碳足迹和机器部件的可调润滑，而且还能够在制造过程中处理柔软的生物材料和精密的电子部件。此外，从这项研究中获得的知识允许机器接口动态地适应其当前任务，从而提高机器的多功能性，效率和产品质量。因此，这项研究的结果有利于美国经济和社会，并有助于将美国制造业扩展到新的应用领域。多学科方法有助于扩大妇女和代表性不足的少数民族学生参与研究，并对工程教育产生积极影响。这项研究产生了通过电调制主动控制水凝胶润滑的基础知识。特别是，该项目确定如何调节三种水凝胶系统中物理相互作用之间的平衡，（1）静电吸引与排斥，（2）氢键与静电排斥，以及（3）疏水性吸引与静电排斥），决定自组装途径和微观结构，以及如何将其应用于调节润滑。这些润滑剂通过微相分离合成。实验研究结合了联合收割机显微镜，振荡剪切和正常和横向力测量与聚合物物理为基础的模型，以提供物理协会在界面结构和流变学中发挥的作用，以及它们如何影响摩擦和粘附力的理解。这项研究还推进了关于化学和电刺激如何驱动摩擦和粘附机制变化的知识。新的知识包括通过整合新的和改进的实验和建模工具集，控制结构-性能关系的响应性水凝胶的新设计规则，该奖项反映了NSF的法定使命，并被认为值得支持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。

项目成果

Insight into the assembly of lipid-hyaluronan complexes in osteoarthritic conditions

深入了解骨关节炎条件下脂质-透明质酸复合物的组装

• DOI: 10.1116/6.0002502
• 发表时间: 2023
• 期刊: Biointerphases
• 影响因子: 2.1
• 作者: Sun, Kangdi;Shoaib, Tooba;Rutland, Mark W.;Beller, Joesph;Do, Changwoo;Espinosa-Marzal, Rosa M.
• 通讯作者: Espinosa-Marzal, Rosa M.

Control of Surface Morphology, Adhesion and Friction of Colloidal Gels with Lamellar Surface Interactions

• DOI: 10.1002/adfm.202300896
• 发表时间: 2023-04-06
• 期刊: ADVANCED FUNCTIONAL MATERIALS
• 影响因子: 19
• 作者: Deptula, Alexander;Rangel-Galera, Jessica;Espinosa-Marzal, Rosa. M. M.
• 通讯作者: Espinosa-Marzal, Rosa. M. M.