Bio-Mediated Technique to Control Phase Changes of Porous Media in Seasonally Frozen Ground

控制季节性冻土中多孔介质相变的生物介导技术

• 批准号: 2314099
• 负责人: Tejo Bheemasetti
• 金额: $ 45.3万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2314099&HistoricalAwards=false
• 关键词: Bio; Mediated; Technique; Control; Phase

This award will develop a bio-mediated technique to reduce freezing and ice lens formation in soils using antifreeze proteins (AFPs) from psychrophilic (cold-loving) microorganisms. The moisture in the seasonally frozen ground, when subjected to freeze-thaw cycles, can develop large ice lenses that degrade the performance of civil infrastructure and affects land surface characteristics such as radiation balance and latent heat exchange. A significant amount of rehabilitation efforts, chemicals, and conservative design approaches are currently used to maintain cold-region infrastructure in serviceable conditions. Our solution is to extract AFPs from psychrophiles and use them to change the freezing characteristics of water in soil to prevent the formation of the detrimental ice lenses. The research will be complemented by establishing an educational and outreach program to engage undergraduate students in convergence research on bio-inspired solutions to complex engineering problems and incorporate cold-region bio-geotechnics in the curriculum.The goal of this project is to investigate, optimize, and develop a bio-mediated sustainable approach to control the phase change transformations of the pore-water present in the porous media of seasonally frozen ground. The growth of ice-lenses in porous soil media is a complex thermomechanical process that depends on freezing rate, heat extraction, the equilibrium of thermal, mechanical, and chemical forces, and effective stress on soil skeleton. We will investigate the following specific objectives: (1) characterize the antifreeze properties of moderate to hyperactive AFPs from different psychrophiles; (2) investigate the bio-treated soils’ thermal characteristics including thermal hysteresis, phase changes, freezing point and evaluate corresponding ice inhibition, ice shaping, and ice recrystallization activities; and (3) evaluate the resiliency of the bio-mediated technique to freeze-thaw cycles and investigate the strength and deformation characteristics of the untreated and bio-treated soils. This project will advance the knowledge base in applications of AFPs, ice mechanics, and soil-ice interfaces to enhance resiliency of cold region infrastructure.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.

该奖项将开发出一种生物介导的技术，可使用抗冻蛋白（AFP）在土壤中降低冰点和冰晶状体的形成，该技术使用了精神病（热爱的）微生物的抗冻蛋白（AFP）。季节性冷冻地面中的水分在经受冻融周期后会产生大型冰透镜，从而降低民用基础设施的性能并影响陆地表面特征，例如辐射平衡和潜在热交换。目前，使用大量的康复工作，化学品和保守的设计方法来维持在可服务条件下的冷区基础设施。我们的解决方案是从精神矿中提取AFP，并使用它们来改变土壤中水的冷冻特性，以防止形成有害的冰透镜。 The research will be completed by establishing an educational and outreach program to engage undergraduate students in convergence research on bio-inspired solutions to complex engineering problems and incorporate cold-region bio-geotechnics in the curriculum.The goal of this project is to investigate, optimize, and develop a bio-mediated sustainable approach to control the phase change transformations of the pore-water present in the porous media of seasonally frozen ground.多孔土壤培养基中冰镜的生长是一个复杂的热机械过程，取决于冰点，热提取，同等的热，机械和化学力以及对土壤骨架的有效应力。我们将研究以下特定目标：（1）表征来自不同心理剂中等至动力AFP的防冻特性； （2）研究了经过生物处理的土壤的热磁滞，相变，冰点，并评估相应的冰抑制作用，冰层和冰重结晶活性； （3）评估生物介导的技术在冻结周期并研究未经处理和生物处理土壤的强度和变形特性的弹性。该项目将在AFP，ICE机械和土壤冰界面的应用中提高知识库，以提高冷区基础设施的弹性。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来评估被认为是宝贵的支持。