MRI: Acquisition of a Cryogen-free Cooling System to Enable Multi-Modal Materials Research and Research Training

MRI：采购无冷冻剂冷却系统以实现多模式材料研究和研究培训

• 批准号: 1920177
• 负责人: Karl Sandeman
• 金额: $ 15.44万
• 依托单位: CUNY Brooklyn College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1920177&HistoricalAwards=false
• 关键词: MRI; Acquisition; Cryogen; free; Cooling

The ability to conduct regular, reliable measurements of material properties is a cornerstone of modern materials physics research and training. The physical property measurement system (PPMS) at CUNY-Brooklyn College currently provides essential measurement of electrical, magnetic and thermodynamic material properties over a wide range of temperature and in magnetic fields of up to 9 Tesla. The acquisition of a cryogen-free dewar for the PPMS will greatly improve CUNY-Brooklyn College researchers' ability to collaborate and respond to research needs in a timely fashion by eliminating the need to purchase expensive liquid helium to cool the magnet and sample measurement chamber. Cryogen-free operation of the PPMS will maximize research output, allowing innovation in 3 key areas of energy-related science: pressaure-driven cooling and magnetic cooling, and aluminum ion battery technology. Cryogen-free operation will also give high school, undergraduate and graduate students, many of whom are from under-represented groups, research training opportunities. The lifespan of the upgraded instrument will be more than 10 years, while the costs of future operation and maintenance have been carefully assessed and will be reduced significantly. The acquisition of a cryogen-free dewar for the physical property measurement system (PPMS) at CUNY-Brooklyn College will enable transformative research in 3 areas of energy-related science: (1) investigate the (pressure,temperature) phase diagram of metal-organic molecules and polymeric structures that have spin crossover transitions near room temperature; the aim is to understand the role of different ligands and side-chains in the response of spin crossover compounds to hydrostatic pressure, building on our recent work that has recently demonstrated the first giant barocaloric effect in this class of compounds; (2) adiabatic temperature change measurements using a sensor recently constructed and tested by undergraduates at Brooklyn College; the results will be correlated with total scattering of hard x-rays at synchrotron sources. (3) ionic conductivity and viscosity experiments on electrolytes for next- generation aluminum ion batteries, thereby investigating fundamental characteristics of ion transport that enable better, safer performance than current lithium-based technology. The research will have societal and technological impact as it is motivated by the need to reduce the environmental footprint of cooling and by seeking improvements in battery technology.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.

对材料特性进行定期、可靠测量的能力是现代材料物理学研究和培训的基石。纽约市立大学布鲁克林学院的物理性质测量系统（PPMS）目前可以在大范围的温度和高达9特斯拉的磁场下测量材料的电、磁和热力学性质。为PPMS购买无低温杜瓦瓶将大大提高纽约市系-布鲁克林学院研究人员的协作能力，并及时响应研究需求，从而消除了购买昂贵的液氦来冷却磁铁和样品测量室的需要。PPMS的无低温运行将最大限度地提高研究产出，使能源相关科学的三个关键领域实现创新：压力驱动冷却和磁冷却，以及铝离子电池技术。无低温操作还将给高中生、本科生和研究生（其中许多人来自代表性不足的群体）提供研究培训机会。升级后的仪器寿命将超过10年，而未来的运行和维护成本已经过仔细评估，将大大降低。为纽约市立大学布鲁克林学院的物理性质测量系统（PPMS）获得无低温杜瓦瓶将使能源相关科学的3个领域的变革研究成为可能：(1)研究在室温附近具有自旋交叉转变的金属有机分子和聚合物结构的（压力，温度）相图；我们的目标是了解不同的配体和侧链在自旋交叉化合物对静水压力的反应中的作用，以我们最近的工作为基础，最近在这类化合物中首次证明了巨大的气压效应；(2)使用布鲁克林学院本科生最近建造和测试的传感器测量绝热温度变化；结果将与同步加速器源的硬x射线的总散射相关联。(3)对下一代铝离子电池的电解质进行离子电导率和粘度实验，从而研究离子传输的基本特性，从而实现比当前锂基技术更好、更安全的性能。这项研究将产生社会和技术影响，因为它的动机是需要减少冷却对环境的影响，并寻求改进电池技术。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。