CAREER: Measurement and Analysis of Osmosis-Mediated, Closed-cell Poroelastic Dynamics

这个教师早期职业发展（CAREER）奖将描述闭孔流体-固体复合材料的物理-化学-流体力学行为下的运动驱动的制度。植物王国安静而高效地生活，没有肌肉组织的帮助。尽管缺乏这种能力，植物可以利用水作为驱动力产生大的甚至快速的运动。这些运动使能量收集成为可能。该奖项支持使用这种运动驱动的运动作为灵感的研究工作。在利用植物结构中，由这些努力产生的合成植物组织类似物将提供无毒、节能和定制的响应。同时，这种材料在水中使用时不需要连接外部电源。这些水工建筑物的预期响应可以被调整以提供作为时间和位置两者的函数的响应变化。诸如此类的反应对于许多组织治疗是必不可少的，并将通过在医疗保健和生物力学中的应用造福社会。此外，该奖项支持的基本努力将丰富对植物水力响应的理解，这是详细气候模型的必要组成部分。此外，还将在体育训练营中开展针对年轻女运动员的STEM推广教育活动，并与伊利诺伊大学的英语教授合作，举办关于科学演讲的交流/修辞的课外研讨会。研究小组将根据现有的有限变形固体多孔弹性理论，为这类目前尚未描述的材料开发本构模型。模型将通过对合成植物组织类似物的实验来了解，这些实验是为了在浸入水性环境中时产生均匀的变形反应而设计的。作为对最终模型的验证，动态和/或非连续变形的建筑复合材料将被设计和制造，目标是亚稳态的，分层的自组装结构。在成功地模拟这些材料，这项工作将填补现有的空白，在植物组织中的“水关系”的理解。具体而言，通过工程水-固复合材料控制材料和表面特性，这项工作将解决关于细胞间和细胞内水流途径及其对细胞内渗透压和静水压力的依赖性的持续争论。

This Faculty Early Career Development (CAREER) award will describe the physico-chemo-hydromechanical behavior of closed-cell fluid-solid composites under the regime of osmosis-driven motion. The plant kingdom quietly and efficiently goes about its life without the aid of muscle tissue. Despite this lack, plants can produce large and even rapid movements using water as the driving force. These movements enable energy harvesting. This award supports research efforts that use this osmosis-driven motion as inspiration. In leveraging plant architectures, the synthetic plant-tissue-analogs resulting from these efforts will provide a non-toxic, energy efficient, and tailored response. Simultaneously, such materials would require no connection to an external power support when used in water. The anticipated response of these hydraulic structures may be tuned to provide response variation as a function of both time and position. Responses such as these are essential for many tissue therapies and will benefit society via applications in healthcare and biomechanics. Further, the fundamental efforts supported by this award will enrich understanding of the hydraulic response of plants, a necessary component of detailed climate models. Educational activities for STEM outreach to young female athletes at sport camps will also be developed and extracurricular seminars on communication/rhetoric for scientific presentations will be established in collaboration with an English professor at the University of Illinois.The research team will develop a constitutive model for this currently undescribed class of materials by building on existing theories of poroelasticity for solids capable of finite deformation. Models will be informed by experiments on synthetic plant-tissue-analogs architected for a homogeneous deformation response when immersed in an aqueous environment. As validation of the final model, dynamically and/or inhomogeneously-deforming, architected composites will be designed and fabricated with an aim toward metastable, hierarchical self-assembled structures. In successfully modeling these materials, this work will fill an existing gap in the understanding of 'water relations' in plant tissue. Specifically, by controlling material and surface properties via engineered water-solid composites, this work will resolve an ongoing debate regarding inter- and intra-cellular water flow pathways and their dependence on the osmotic and hydrostatic pressure within the cells.