Collaborative Research: Template-Free Manufacturing of Regular Microstructures by Ribbing-Enhanced Roll Coating

合作研究：通过罗纹增强辊涂无模板制造规则微结构

• 批准号: 2030404
• 负责人: Chang-Jin Kim
• 金额: $ 44.95万
• 依托单位: University of California-Los Angeles
• 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: 2020-09-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2030404&HistoricalAwards=false
• 关键词: Collaborative; Research; Template; Free; Manufacturing

A technology that can reduce the friction or drag on ship hulls would have a substantial economic and environmental impact by improving fuel efficiency. Microstructured superhydrophobic surfaces may retain air pockets that can act as gas lubrication between the water and the ship hull. Although the superhydrophobic surfaces have been studied for nearly two decades, it is only recently that periodic linear-trench structures have been shown to be effective for marine crafts traveling in open water, which represents sea, oceans, and lakes. The manufacturing of such well-defined micro-trenches has relied on silicon-based microfabrication based on semiconductor manufacturing approaches. These silicon processes are prohibitively expensive and not scalable for large surface areas, such as ship hulls. To address these challenges, a team from North Carolina State University and University of California at Los Angeles would like to utilize roll coating methodology, which is well known for cost-effective and large-scale production, to form the periodic microstructures on large substrates. This new process is researched to develop friction-reduction coatings for ship hulls and study their physical and chemical durability. Hence, outcomes from this research will benefit a wide array of marine applications, including commercial and military ships, which play a significant role in the national and global economies and security applications. This project is investigates the spontaneous pattern generation by ribbing on polymer surfaces during roll coating in an ordered manner using a fundamentally new approach to manufacture three-dimensional micro and nano-scale structures on a large-area substrate. The objectives are to establish the scientific foundation to control the microstructures formed during the roll coating, and to fabricate and validate the drag reduction efficiency of the surfaces in realistic flow conditions of open water and Reynolds number greater than 1 million. The research team will utilize computational modeling to predict the deformation behavior of the viscoelastic polymer verified by the experimental observations. For the proof-of-concept of drag reduction in realistic flows, a microstructured film and a smooth film will be layered on the bottom of a motorboat specifically outfitted to reliably compare the fluid shear stresses on the two. This project will educate the next generation of engineers and scientists through multidisciplinary research involving manufacturing, materials science, computational modeling, and fluid mechanics. The research outcome will be also used to educate K-12, undergraduate, as well as graduate-level students through various formats such as outreach activities and innovative curricular efforts.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.

可以通过提高燃油效率来减少施加摩擦或拖动船体的技术将产生重大的经济和环境影响。微结构的超疏水表面可能会保留空气口袋，这些空气口袋可以充当水与船体之间的气体润滑。尽管已经研究了近二十年的超疏水表面，但直到最近才证明，周期性的线性沟通结构对海洋工艺品有效，代表海洋，海洋和湖泊。这种定义明确的微型运输的制造依赖于基于硅的微加工，基于半导体制造方法。这些硅过程非常昂贵，对于大型表面积（例如船体）而言不可扩展。为了应对这些挑战，北卡罗来纳州立大学和加利福尼亚大学洛杉矶分校的一个团队希望利用卷涂层方法，该方法以具有成本效益和大规模生产而闻名，以形成大型基板的周期性微观结构。研究了这一新过程，以开发用于船体船体的摩擦涂料并研究其物理和化学耐用性。因此，这项研究的结果将使包括商业和军事船在内的各种海洋应用中受益，这些船在国家和​​全球经济和安全应用中发挥了重要作用。该项目通过在卷涂层期间以有序的方式在聚合物表面上进行肋骨来调查自发模式的产生，该项目使用从根本上新的方法在大区块底物上生产三维微型和纳米级结构。这些目标旨在建立科学基础，以控制卷涂层期间形成的微观结构，并在开放水和雷诺数的逼真的流动条件下制造和验证表面的阻力降低效率大于100万。研究团队将利用计算建模来预测通过实验观察验证的粘弹性聚合物的变形行为。为了证明减少逼真的流量的阻力概念，微观结构膜和光滑的膜将分层在摩托艇的底部，专门用来可靠地比较两者上的流体剪切应力。该项目将通过涉及制造，材料科学，计算建模和流体力学的多学科研究来教育下一代工程师和科学家。研究结果还将用于教育K-12，本科生以及研究生级的学生通过各种格式（例如外展活动和创新的课程努力）进行教育。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估审查标准来通过评估来通过评估来支持的。

项目成果

Sustainability of the plastron on nano-grass-covered micro-trench superhydrophobic surfaces in high-speed flows of open water

• DOI: 10.1017/jfm.2023.184
• 发表时间: 2023-04
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Ning Yu;Z. R. Li;Alexander McClelland;Francisco Jose del Campo Melchor;Sun Youb Lee;Jae Hwa Lee;C. Kim

Combined Theory and Experimental Verification of Plastron Stability on Superhydrophobic Surface

超疏水表面腹甲稳定性的理论与实验相结合的验证

• DOI: 10.1109/mems51670.2022.9699456
• 发表时间: 2022
• 期刊: IEEE 35th International Conference on Micro Electro Mechanical Systems Conference (MEMS
• 作者: Yu, Ning;Li, Zhaohui Ray;McClelland, Alexander;Kim, Chang-Jin CJ
• 通讯作者: Kim, Chang-Jin CJ

Superhydrophobic drag reduction in turbulent flows: a critical review

• DOI: 10.1007/s00348-021-03322-4
• 发表时间: 2021-10
• 期刊: Experiments in Fluids
• 影响因子: 2.4
• 作者: Hyungmin Park;Chang‐Hwan Choi;C. Kim

Template‐Free Scalable Fabrication of Linearly Periodic Microstructures by Controlling Ribbing Defects Phenomenon in Forward Roll Coating for Multifunctional Applications

• DOI: 10.1002/admi.202201237
• 发表时间: 2022-08
• 期刊: Advanced Materials Interfaces
• 影响因子: 5.4
• 作者: Md. Didarul Islam;Himendra Perera;B. Black;Matthew Phillips;Muh-Jang Chen;G. Hodges;Allyce Jackman;Yuxuan Liu;C. Kim;M. Zikry;Saad A Khan;Yong Zhu;M. Pankow;J. Ryu