Mechanics of Interfacial Assemblies

界面组件的力学

• 批准号: 1438425
• 负责人: Anthony Dinsmore
• 金额: $ 32.81万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1438425&HistoricalAwards=false
• 关键词: Mechanics; Interfacial; Assemblies

CBET 1438425This project examines the mechanical properties of liquid interfaces that are coated by small particles. When the number of particles on a liquid interface is large, the particles can form arrangements called mesostructures, which can change the mechanical stiffness, permeability, appearance, or other properties of the interface. The project will use a combination of experiments, theory, and numerical calculations to show how mesostructure formation affects mechanical properties of the interface. Interfaces covered with particles appear in a wide variety of technological and biological applications including microcapsule formulations for food products and drug delivery, separations in mining operations, and improved, low-toxicity dispersants for treating oil contamination in bodies of water. The information obtained in this project will provide new methods for scientists and engineers to predict, analyze, and control the mechanical properties of interfaces, which can lead to innovative and mechanically robust products. This project will also support the training of undergraduate and graduate students for careers in science or engineering, and it will support outreach to K-12 students and teachers.Particle-coated interfaces, called particle sheets, will be fabricated and their stiffness (moduli) for stretching and bending will be measured. Particle sheets will be subjected to stress or geometric distortion to identify three distinct responses, wrinkling or buckling, tearing or cracking, and the formation of particle-packing defects such as disclinations or dislocations. The response of a particle sheet to uniaxial compression will provide the bending modulus. The response to point-like forces imposed on the sheet by poking will provide the stretching modulus. Changing the curvature of a particle sheet by confining it on a curved interface will elucidate the competition among wrinkles, cracks and particle-packing defects. The experimental and theoretical activities in this project will lead to the development of a structural relaxation phase diagram for thin sheets composed of particles.

这个项目研究被小颗粒包裹的液体界面的机械性能。当液体界面上的颗粒数量很大时，颗粒可以形成称为介观结构的排列，这可以改变界面的机械刚度、渗透性、外观或其他性能。该项目将结合实验、理论和数值计算来展示介观结构的形成如何影响界面的力学性能。被颗粒覆盖的界面出现在各种各样的技术和生物应用中，包括用于食品和药物输送的微胶囊配方，采矿作业中的分离，以及用于处理水体中石油污染的改进的低毒分散剂。该项目获得的信息将为科学家和工程师提供预测、分析和控制界面力学性能的新方法，这可以导致创新和机械坚固的产品。该项目还将支持本科生和研究生在科学或工程领域的职业培训，并将支持对K-12学生和教师的推广。将制造被称为颗粒片的颗粒涂层界面，并测量其拉伸和弯曲的刚度（模量）。颗粒片将受到应力或几何扭曲，以确定三种不同的反应，起皱或屈曲，撕裂或开裂，以及颗粒堆积缺陷的形成，如斜位或位错。颗粒片对单轴压缩的响应将提供弯曲模量。通过戳向薄板施加的点状力的响应将提供拉伸模量。通过将颗粒片限制在弯曲界面上来改变颗粒片的曲率，可以解释褶皱、裂纹和颗粒堆积缺陷之间的竞争。本项目的实验和理论活动将导致由粒子组成的薄片的结构弛豫相图的发展。