Structured Surfaces for Prevention of Ice Adhesion and Growth

用于防止冰粘附和生长的结构化表面

• 批准号: 1537474
• 负责人: Chang-Hwan Choi
• 金额: $ 31.64万
• 依托单位: Stevens Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537474&HistoricalAwards=false
• 关键词: Structured; Surfaces; Prevention; Ice; Adhesion

Materials surfaced with highly ice-repelling (ice-phobic) properties are of great significance in many applications. This award supports fundamental research on the understanding of critical surface parameters for super-ice-phobic efficiency and durability of nanostructured surfaces in well-regulated environments. The new scientific insights obtained from this study will be of great importance in the design and development of highly efficient and durable anti-icing coatings and materials for numerous applications including commercial/military aircrafts/vessels, wind turbines, and high voltage power lines. The highly icing-resistant properties of structured surfaces will also significantly advance current de-icing technologies and efficiency. The materials engineered with greater ice-phobic robustness and durability will further influence a broader spectrum of technology issues from energy to civil infrastructure. The educational and outreach activities integrated with this research will also enhance undergraduate students' experiential learning, yield valuable curricular products that can benefit high school students in NJ, provide professional development opportunities to high school teachers, and create a scientific awareness in the under-served/represented communities.The objective of this research is to establish fundamental correlations between hydro-phobicity (non-wettability to water) and ice-phobicity (ability to repel ice or prevent ice formation) of structured surfaces. The main hypothesis is that the anti/de-icing efficiency of hydro-phobic surfaces should be determined by the wetting and adhesion states of super-cooled water or ice droplets on the structured surfaces and that the denser (e.g., nanoscale rather than microscale) structures with lower contact angle hysteresis and greater de-wetting stability should result in more efficient and durable anti/de-icing properties. To verify the hypothesis, how the length scale and kinetic/dynamic parameters of structured surfaces determine the contact angle hysteresis and adhesion/frictional properties against ice via the development of well-controlled surface structure models will be studied. A detailed parametric study will also be performed to understand thermo/hydro/aero-dynamic effects (e.g., temperature, air speed, liquid water content, and size of droplets) on the anti/de-icing effectiveness of hydro-phobic surfaces by using a custom-designed icing wind tunnel system integrated in situ with a centrifugal adhesion tester. For the direct visualization of wetting and adhesion states during the ice formation, several microscopy and nanography techniques will also be employed, including reflection interference contrast microscopy, cryo-scanning electron microscopy, wet scanning transmission electron microscopy, and small angle X-ray scattering. The methods and approaches to be used will lead to a new and deeper understanding of the critical surface parameters impacting ice-phobic efficiency and durability, revealing the correlation between surface hydro-phobicity and ice-phobicity.

表面具有高度斥冰（疏冰）性能的材料在许多应用中具有重要意义。该奖项支持对纳米结构表面在良好监管环境中的超级疏冰效率和耐久性的关键表面参数的理解的基础研究。从这项研究中获得的新的科学见解将在设计和开发高效耐用的防冰涂料和材料方面具有重要意义，这些涂料和材料适用于许多应用，包括商业/军用飞机/船舶，风力涡轮机和高压电力线。结构化表面的高度抗冰性能也将大大提高目前的除冰技术和效率。这些材料具有更强的抗冰坚固性和耐用性，将进一步影响从能源到民用基础设施的更广泛的技术问题。与本研究相结合的教育和推广活动也将加强本科生的体验式学习，产生有价值的课程产品，可以使新泽西州的高中生受益，为高中教师提供专业发展机会，并在服务不足/有代表性的社区建立科学意识。本研究的目的是建立疏水性之间的基本相关性，（对水的不可润湿性）和疏冰性（排斥冰或防止冰形成的能力）。主要假设是疏水性表面的防/除冰效率应该由过冷水或冰滴在结构化表面上的润湿和粘附状态决定，并且密度越大（例如，纳米级而不是微米级）结构，其具有较低的接触角滞后和较大的去湿稳定性，这将导致更有效和持久的防/除冰性能。为了验证这一假设，将研究结构化表面的长度尺度和动力学/动力学参数如何通过开发控制良好的表面结构模型来确定接触角滞后和对冰的粘附/摩擦特性。还将进行详细的参数研究，以了解热/水/空气动力学效应（例如，温度、空气速度、液态水含量和液滴尺寸）对疏水表面防/除冰效果的影响。为了在冰形成过程中的润湿和粘附状态的直接可视化，也将采用几种显微镜和纳米技术，包括反射干涉对比显微镜，低温扫描电子显微镜，湿扫描透射电子显微镜，和小角度X射线散射。所使用的方法和途径将导致对影响疏冰效率和耐久性的关键表面参数的新的和更深入的理解，揭示表面疏水性和疏冰性之间的相关性。