GOALI: Understanding Ice Adhesion and Nucleation on Surfaces

技术概述：这个GOALI项目的目标是对各种表面（包括疏水、亲水、带电、纹理和混合图案表面）上的冰粘附和冰成核有一个基本的理解。尽管对易冰涂层进行了大量的研究和开发，但对冰涂层界面的基本和分子理解以及这些表面上冰成核的动力学仍然缺乏。此外，在分子水平上对这些涂层的冰核和附着力进行原位表征，以及在模拟的大气冰条件下（例如：高速过冷水滴撞击），都是一个巨大的挑战。本课题将通过实验和分子动力学模拟研究涂层化学、形貌和形貌对冰核和粘附的影响。表面敏感红外可见和频产生光谱（SFG）将用于研究水（冰）和模型表面涂层之间的埋藏界面。表面光谱结果将与冰的粘附性相关联，使用GE全球研究中心提供的广泛的冰隧道和风扇测试能力。一系列亲水性、疏水性和带电表面将由短链和长链硅烷基官能团制备。此外，通用电气全球研究中心开发的多种图案和先进的纳米光刻技术将用于制造有纹理的基板。然后，将实验结果与分子动力学模拟结果进行比较。该项目的目的是发展对冰成核的基本理解，这在许多应用中是重要的，如风力涡轮机，飞机发动机和电线。从这项工作中获得的知识将有助于开发或增强下一代防冰涂层，这些涂层可以显着延缓或防止这些表面上的冰形成。实现这种防冰涂层可以显著提高大量作业的效率和安全性。该项目将支持两名研究生，除了在阿克伦大学（UA）学习外，他们将在位于尼斯卡尤纳的通用电气全球研究中心学习一年。与GE的一群科学家一起工作的经历以及使用他们先进的制造和测量设备将为这些学生提供重要的培训和教育。一些外联活动将会进行，包括来自一个行业团队的共同负责人在UA教授技术I课程，以及让高中生参与GE和UA的研究。

TECHNICAL SUMMARYThe objective of this GOALI project is to develop a fundamental understanding of ice adhesion and ice nucleation on a variety of surfaces, including hydrophobic, hydrophilic, charged, textured and mixed patterned surfaces. Despite considerable studies and development of easy-ice-release coatings, the fundamental and molecular understanding of ice-coating interfaces and the kinetics of ice nucleation on these surfaces are lacking. In addition, in-situ characterization of ice nucleation and adhesion of these coatings at the molecular level and under-simulated atmospheric ice conditions (for example: high velocity super-cooled water droplet impact) pose a formidable challenge. This proposal will study the influence of coating chemistry, morphology and topography on ice nucleation and adhesion using both experiments and molecular dynamic simulations. Surface sensitive infrared visible sum frequency generation spectroscopy (SFG) will be used to study the buried interface between water (and ice) and model surface coatings. Surface spectroscopy results will be correlated with adhesion of ice using extensive ice tunnel and fan test capabilities available at GE Global Research. A series of hydrophilic, hydrophobic and charged surfaces will be fabricated from short and long chain silane-based functional groups. Also, multiple patterning and advanced nanolithography techniques developed at GE Global Research will be used to create textured substrates. Thereafter, the experimental results will be compared to the molecular dynamics simulation results.NON-TECHNICAL SUMMARYThe objective of this project is to develop a fundamental understanding of ice nucleation, which is important in many applications such as wind turbines, aircraft engines and electrical wires. The knowledge gained from this work will aid in developing or enhancing next generation anti-icing coatings that may either significantly delay or prevent ice formation on these surfaces. Realization of such anti-icing coatings can dramatically improve the efficiency and safety of large numbers of operations. This project will support two graduate students who will spend one year at GE Global Research Center in Niskayuna, in addition to their studies at The University of Akron (UA). The experience of working with a group of scientists at GE and the use of their advanced fabrication and measurement facilities will provide important training and education to these students. Several outreach activities that involve co-PI from an industry team teaching the Technology I class at UA and involvement of high school students in research at GE and UA will be undertaken.