Mechanics of Stimuli-Responsive Membrane-Based Materials

刺激响应膜基材料的力学

• 批准号: 1537410
• 负责人: Eric Freeman
• 金额: $ 28.47万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537410&HistoricalAwards=false
• 关键词: Mechanics; Stimuli; Responsive; Membrane; Based

Membrane-based materials possess fluid compartments separated by thin bilayer membranes. These membranes are capable of mimicking cell membranes, and carefully arranged membrane networks have been considered for use in engineering applications ranging from hearing aids to actuators. This award supports fundamental research on the ability of the membrane to convert mechanical force into meaningful outcomes such as energy conversion and controlled diffusion through the material network. The goal of this work is the advancement of a low-cost material that is simple to assemble while still useful for industries ranging from pharmaceuticals to renewable energy. The research is highly interdisciplinary, combining mechanical, electrical, biological, and chemical engineering. Results from this award will be used to promote interdisciplinary research projects and to develop open-source educational tools and predictive modeling software. There is evidence that these membrane-based materials may be activated and controlled by mechanotransduction, harnessing the unique emulsive elasticity of the material. The multiphysics interactions between applied mechanical force and the response of the internal membranes are not well characterized, requiring new models and experiments for their study. This hypothesized link between material deformation and membrane activity is investigated in detail through this award, creating mechanical models linking the deformation of the bulk material to subsequent deformations of the internal membranes. This task is accomplished through coupled experimental and theoretical work. First, large networks of the membrane-based material will be created. Then these networks will be deformed through various methods including bulk displacement, magnetic forces, osmotic shocks, and high-frequency vibration. Each of these methods for material excitation produces different responses in the interfacial membranes, and will allow for the determination of parameters such as the bulk modulus, stiffness, and damping of the material components. These values will be used to populate models for the material deformation, wherein the material will be simulated as collections of fixed-volume compartments with variable surface elements and contours, examining the dynamic changes in material morphology. This project is designed to address the gaps in current models for the mechanical deformation of the material, and will illustrate the necessary parameters for meaningful mechanotransduction in membrane-based materials.

膜基材料具有由薄双层膜分隔的流体隔室。 这些膜能够模仿细胞膜，并且仔细排列的膜网络已被考虑用于从助听器到致动器的工程应用中。 该奖项支持对膜将机械力转化为有意义的结果的能力的基础研究，例如通过材料网络的能量转换和受控扩散。 这项工作的目标是开发一种低成本的材料，这种材料组装简单，同时仍然适用于从制药到可再生能源等行业。 该研究是高度跨学科的，结合了机械，电气，生物和化学工程。 该奖项的成果将用于促进跨学科研究项目，并开发开源教育工具和预测建模软件。有证据表明，这些基于膜的材料可以通过机械转导来激活和控制，利用材料独特的乳化弹性。 施加的机械力和内部膜的响应之间的多物理场相互作用没有得到很好的表征，需要新的模型和实验进行研究。 通过该奖项详细研究了材料变形和膜活性之间的这种假设联系，创建了将散装材料的变形与内部膜的后续变形联系起来的机械模型。 这一任务是通过耦合实验和理论工作来完成的。 首先，将创建基于膜的材料的大型网络。 然后这些网络将通过各种方法变形，包括体积位移，磁力，渗透冲击和高频振动。 这些材料激励方法中的每一种都会在界面膜中产生不同的响应，并且可以确定材料成分的体积模量、刚度和阻尼等参数。 这些值将用于填充材料变形的模型，其中材料将被模拟为具有可变表面元素和轮廓的固定体积隔室的集合，检查材料形态的动态变化。 该项目旨在解决当前材料机械变形模型中的差距，并将说明膜基材料中有意义的机械转导的必要参数。

项目成果

Morphogenesis-inspired two-dimensional electrowetting in droplet networks

液滴网络中受形态发生启发的二维电润湿

• DOI: 10.1088/1748-3190/acc779
• 发表时间: 2023
• 期刊: Bioinspiration & Biomimetics
• 影响因子: 3.4
• 作者: El-Beyrouthy, Joyce;Makhoul-Mansour, Michelle;Gulle, Jesse;Freeman, Eric
• 通讯作者: Freeman, Eric