GOALI: Collaborative Research: Non-invasive measurement of kinematics and rheology in a non-equilibrium drying complex fluid

目标：合作研究：非平衡干燥复杂流体中运动学和流变学的非侵入性测量

• 批准号: 1931681
• 负责人: James Gilchrist
• 金额: $ 30.4万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1931681&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Non; invasive

Coatings impact many applications, including consumer products, medicine, food, and engineering applications, typically serve one of three purposes: to protect and extend the life of a product, to improve aesthetics, or to add new functionality. Small defects that form during solidification of a fluid film coating can harm the ultimate functionality of the coating. In a single automotive plant, painting accounts for 60% of the energy consumption, and refinishing to repair defects can cost more than $10 million/year. There are few methods capable of non-invasive tracking of the coating properties during drying. The objective of this project is to develop the capability to measure the transient viscosity and flow of a drying coating with time- and space- resolved optical measurements. The underlying knowledge gained via this project in relation to how transient rheology affects fluid flow will be applicable to a multitude of coating manufacturing processes. The project will have significant impact on coatings design and processing, help to bridge the gap between academia and industry, and include outreach to the science, technology, engineering, and math communities.The research objective of this proposal is to measure the transient rheology and kinematics of a drying complex fluid. Traditional macroscopic rheological techniques require physical contact with the coating during the measurement (i.e. the technique is invasive and alters drying) and are unable to spatially resolve rheological changes within the coating. This project will be enabled by non-invasive, high temporal and spatial resolution optical techniques to measure the time- and space-resolved rheology and flow in model complex fluids. Specifically, the research goals are to (1) measure the spatial dependence of rheology in a drying thin film with varied viscosity, (2) to determine and implement a suitable method of convection correction for thin films of drying viscoelastic fluids, and (3) to measure the impact of formulation and substrate angle on the transient convection cell structure and related microstructure formation in thin films of drying viscoelastic fluids. The proposed work on model ~0.100 mm thin films will be applicable to a broad set of applications and will complement ongoing work the industrial partner, PPG. When successful, this research will significantly enhance the design and processing of coatings for a wide range of applications.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.

涂料影响许多应用，包括消费品、医药、食品和工程应用，通常用于以下三个目的之一：保护和延长产品的使用寿命、改善美观或添加新功能。流体薄膜涂层固化过程中形成的小缺陷可能会损害涂层的最终功能。 在一家汽车工厂中，喷漆占能源消耗的 60%，而修补缺陷的修补漆每年的成本可能超过 1000 万美元。 很少有方法能够在干燥过程中非侵入性地跟踪涂层特性。 该项目的目标是开发通过时间和空间分辨光学测量来测量干燥涂层的瞬态粘度和流动的能力。通过该项目获得的有关瞬态流变如何影响流体流动的基础知识将适用于多种涂料制造工艺。该项目将对涂料设计和加工产生重大影响，有助于弥合学术界和工业界之间的差距，并包括向科学、技术、工程和数学界的推广。该提案的研究目标是测量瞬态流变性和干燥复杂流体的运动学。传统的宏观流变技术需要在测量过程中与涂层进行物理接触（即该技术是侵入性的并改变干燥），并且无法在空间上解析涂层内的流变变化。该项目将通过非侵入性、高时间和空间分辨率光学技术来实现，以测量模型复杂流体中的时间和空间分辨流变性和流动性。具体来说，研究目标是（1）测量具有不同粘度的干燥薄膜中流变学的空间依赖性，（2）确定并实施适合干燥粘弹性流体薄膜的对流校正方法，以及（3）测量配方和基材角度对干燥粘弹性流体薄膜中瞬态对流细胞结构和相关微观结构形成的影响。拟议的 ~0.100 mm 薄膜模型工作将适用于广泛的应用，并将补充工业合作伙伴 PPG 正在进行的工作。一旦成功，这项研究将显着增强涂料的设计和加工，以适应广泛的应用。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力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

Three-Dimensional Sag Tracking in Falling Liquid Films

下落液膜的三维流挂跟踪

• DOI: 10.1021/acs.langmuir.2c01232
• 发表时间: 2022-09
• 期刊: Langmuir
• 影响因子: 3.9
• 作者: Issa, Marola W.;Yu, Hairou;Roffin, Maria Chiara;Barancyk, Steven V.;Rock, Reza M.;Gilchrist, James F.;Wirth, Christopher L.
• 通讯作者: Wirth, Christopher L.