Advanced Adhesion from Origami Inspired Thin-Film Structures

这项拨款将创造对多功能粘合剂系统的新认识，这些粘合剂系统有可能在粗糙表面上产生牢固的粘合，可用于新的测量技术，并可用于创建响应性粘合剂结构。折纸是一种古老的折纸艺术，它将一张薄纸折叠成一个亲密、复杂和美丽的形状。这种策略并不局限于艺术作品——纸张可以折叠成各种形状，从而解决许多现代工程问题。当应用于粘合技术时，折纸设计可以通过使用薄膜的容易弯曲来改变周围的粗糙度，同时利用薄膜的刚度来创建坚固的结构，从而帮助克服挑战。折纸结构也可以设计成在两种状态下稳定，例如，一种能很好地粘在物体上，另一种不能很好地粘在物体上。通过这种方式，动态系统可以根据要求从低附着状态切换到高附着状态。除了这些实际成果之外，本研究还将对折纸结构的不同基本特征，如褶皱、脊和d锥，建立深刻的基础理解。与此同时，这笔赠款将通过互动示范、暑期学校和公开演讲活动，为k-5学生、少数族裔和当地公众创造教育和推广机会。该研究的具体目标是发现材料类型（弹性，塑性，脆性）和几种折纸启发建筑中聚合物薄膜的粘合性能之间的关系。聚二甲基硅氧烷弹性体、聚碳酸酯和聚苯乙烯将被用作模型材料。实验将在共聚焦显微镜下进行，以便在收集传统力-位移数据的同时获得完整的三维结构信息。薄膜环，皱褶和赖克折纸图案将在压缩和张力中进行测试，量化有用的机械和粘附相关指标，如顺应性和峰值粘附力。具体的重点将给予理解材料性质如何相互作用与结构设计单元在薄膜粘合剂。这项工作将促进对基本薄膜构建块结构（弯曲，折叠，d锥和脊）如何协同工作以在折纸设计中提供宏观性能的基本理解。这项研究将允许PI推进对薄膜力学的结构性质的理解，并提高工程师设计和预测折纸启发结构行为的能力。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This grant will create new understanding of versatile adhesive systems that have the potential to create strong bonds on rough surfaces, to be used as new measurement techniques, and to be used to create responsive adhesive structures. Origami is the ancient art of paper folding which involves folding a thin sheet into an intimate, complex, and beautiful shape. The strategy is not limited to artistic work – sheets can be folded into shapes that can solve many modern engineering problems. When applied to adhesive technologies, Origami design can help overcome challenges by using the easy bending of a thin film to deform around roughness, while exploiting the stiffness of a film to create a strong structure. Origami structures can also be designed to be stable in two states, for example, one that sticks to an object well and one that does not stick well. In this way, dynamic systems can be developed to switch from a low adhesion to a high adhesion state upon request. In addition to these practical outcomes, this research will build a deep fundamental understanding of different basic features of origami structures, such as folds, ridges and d-cones. In concert, the grant will create educational and outreach opportunities for k-5 students, underrepresented minorities and the local public through interactive demonstrations, summer schools, and public speaking events. The specific goal of the research is to discover relations between material type (elastic, plastic, brittle) and adhesive performance of thin polymer films in several origami inspired architectures. Polydimethylsiloxane elastomers, polycarbonate and polystyrene will be used as model materials. Experiments will be performed under a confocal microscope, such that full 3D structural information is obtained at the same time as traditional force-displacement data is collected. Thin film loops, crumples and Reich origami patterns will be tested in compression and tension, quantifying useful mechanical and adhesion related metrics such as compliance and peak adhesive force. Specific focus will be given to understanding how material properties interplay with structural design units in thin film adhesives. The work will advance the fundamental understanding of how basic thin-film building block structures (bends, folds, d-cones, and ridges) work in concert to deliver macroscopic performance in Origami based designs. This research will allow the PI to advance structure-property understanding in thin film mechanics and advance the ability of engineers to design and predict behavior of origami inspired structure.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.