GOALI: Biomimetic Design of Fibrillar Interfaces for Adhesion, Tribology, and other Surface Properties

摘要0527785在蜥蜴和昆虫中，大自然进化出了一些表面结构，以控制附着、摩擦学和其他在人造材料中没有的表面特性。例如，蜥蜴使用相对坚硬的材料附着在各种粗糙和光滑的表面上的能力是非常了不起的。在不确定的表面上进行接触和普遍粘附的一个共同特征（根据物种有重要的变化）是使用具有板状铲状末端元件的分层纤维结构。从最近的研究来看，其独特的表面性能，如附着力、摩擦学和可重用性，源于优化的结构设计。该项目旨在开发具有纤维界面的材料，以模仿蜥蜴和昆虫的表面结构。这项工作是由三位学术研究人员与杜邦公司的一个工业研究小组密切合作共同进行的。他们的工作需要几门学科的影响。进行生物学研究是为了检查大自然进化设计的细节和她使用的材料。研究人员开发理论模型，以了解材料特性和结构如何与性能相关。需要了解的现象是这些材料提供的增强接触依从性，由于表面力影响下的侧向坍塌等现象造成的约束，以及在界面分离过程中增强能量耗散的机制。这些被转化为仿生结构的设计标准。研究人员利用微光刻技术根据这些设计标准制造纤维结构，并测试其作为具有有用性能的表面的性能。如果最终目标成功，该计划将为社会提供一种全新的紧固件材料。预期的性能，如单侧性、可重用性、低速率依赖性和设计的方向性，形成了现有紧固件无法达到的独特组合，例如压敏粘合剂和钩/环紧固件（例如魔术贴）。我们希望这种新材料将在服装、半导体处理和机器人等各种应用中得到应用。该项目将培养研究生以高度跨学科的方式工作。它平衡了高科学质量和培训与工业相关性和兴趣。

Abstract 0527785Among lizards and insects, Nature has evolved surface structures for controlled adhesion, tribology, and other surface properties that have no counterparts among man-made materials. The ability of lizards, for example, to adhere to a variety of rough and smooth surfaces using relatively stiff materials is remarkable. A common feature for contact and universal adhesion against an indeterminate surface, with important variations based on species, is the use of a hierarchical fibrillar structure with a plate-like spatular terminal element. It appears from recent studies that its unique surface properties, such as adhesion, tribology, and re-usability, result from optimized architectural design. This project aims to develop materials with fibrillar interfaces that mimic surface structures in lizards and insects.This work is being conducted jointly by three academic researchers working in close collaboration with an industrial research group at the DuPont Company. Their work requires the influence of several disciplines. Biological studies are undertaken to examine the details of the designs Nature has evolved and the materials she uses. The investigators develop theoretical models to understand how materials properties and architecture relate to performance. Phenomena that need to be understood are the enhanced contact compliance offered by these materials, constraints due to phenomena such as lateral collapse under the influence of surface forces, and mechanisms by which energy dissipation is enhanced during interfacial separation. These are converted into design criteria for biomimetic structures. The investigators fabricate fibrillar structures based on these design criteria using micro-lithographic techniques and test their performance as surfaces with useful properties.If successful in its ultimate aim, this program will provide society with an entirely new class of fastener materials. Anticipated properties, such as one-sidedness, re-usability, low rate-dependence, and designed directionality, form a unique set not accessible by extant fasteners, for example, pressure sensitive adhesives and hook/loop fasteners (e.g. Velcro). We expect the new material will find use in applications as diverse as apparel, semiconductor handling, and robotics. The project will train graduate students to work in a highly interdisciplinary manner. It balances high scientific quality and training with industrial relevance and interest.