GOALI: Understanding Ice Adhesion and Nucleation on Surfaces

技术总结GOALI项目的目标是对各种表面上的冰粘附和冰成核有一个基本的了解，包括疏水、亲水、带电、纹理和混合图案表面。 尽管大量的研究和开发的易冰释放涂层，冰涂层界面和这些表面上的冰成核动力学的基本和分子的理解是缺乏的。 此外，在分子水平上和在模拟大气冰条件下（例如：高速过冷水滴冲击），这些涂层的冰成核和粘附的原位表征构成了一个艰巨的挑战。 该提案将使用实验和分子动力学模拟来研究涂层化学、形态和形貌对冰成核和粘附的影响。 表面敏感红外可见和频发生光谱（SFG）将用于研究水（和冰）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力相关，使用GE全球研究所提供的广泛的冰隧道和风扇测试能力。 一系列的亲水性，疏水性和带电的表面将制造由短链和长链硅烷基官能团。 此外，多重图案化和先进的纳米光刻技术开发的通用电气全球研究将用于创建纹理基板。 此后，实验结果将与分子动力学模拟结果进行比较。非技术总结本项目的目的是发展对冰成核的基本理解，这在许多应用中非常重要，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迟或防止这些表面上的冰形成。 这种防冰涂层的实现可以显著提高大量操作的效率和安全性。 该项目将支持两名研究生，他们将在尼斯卡尤纳的GE全球研究中心学习一年，并在阿克伦大学（UA）学习。 与GE的一群科学家合作的经验以及使用他们先进的制造和测量设施将为这些学生提供重要的培训和教育。 将开展几项外联活动，其中包括来自一个在UA教授技术I课程的行业团队的共同PI，以及高中生参与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.