Collaborative Research: ECLIPSE: Exploring Non-Oxidative Reaction Pathways of Atmospheric Pressure Plasmas

合作研究：ECLIPSE：探索大气压等离子体的非氧化反应途径

• 批准号: 2308858
• 负责人: Selma Mededovic
• 金额: $ 32.3万
• 依托单位: Clarkson University
• 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: 2023-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2308858&HistoricalAwards=false
• 关键词: Collaborative; Research; ECLIPSE; Exploring; Non

This award supports a collaborative project between North Carolina State University, Clarkson University, and Texas A&M University to explore chemical reaction pathways in low temperature plasmas. The field of low temperature plasmas (LTPs) encompasses applications ranging from microelectronics fabrication and human implants to lasers and solar cell manufacturing. The success of the development of these technologies relies on the reactions of plasma-generated ions and free radicals. While extensive work has been conducted to identify and quantify reactive oxygen and nitrogen species, the generation mechanisms and subsequent reactions of non-oxidative species such as ions and metastable atoms produced by the plasma are largely unknown. These species have been proposed to be deployed for a range of unique plasmochemical transformations, including the removal of toxic per- and polyfluoroalkyl substances (PFAS) known as ''forever chemicals'' from water using multiphase gas-liquid plasma reactors. This project aims to accelerate the development and scale up of plasma reactors to degrade and destroy PFAS, and is supported under the ECosystem for Leading Innovation in Plasma Science and Engineering (ECLIPSE) and Critical Aspects of Sustainability (CAS): Innovative Solutions to Sustainable Chemistry (CAS-SC) programs. The project seeks to elucidate non-oxidative chemical reaction mechanisms and pathways of photons, metastables, radicals, and charged particles generated by atmospheric pressure plasmas in contact with liquid water. The central approach for achieving these objectives involves measuring removal rates of four nonoxidizable fluorinated compounds in three gas-liquid plasma reactors of well-defined hydrodynamics and correlating them to the fluxes delivered from two different atmospheric pressure plasma jet devices. The central hypothesis of this effort is that solvated electrons and hydrogen radicals are the key species involved in non-oxidative chemical transformations. The mechanisms underlying the degradation of short-chain PFAS are of particular interest, as these compounds have proven to be extremely challenging to treat. This project involves students at all levels, from K-12 to graduate, including those from under-served communities. Major activities include development of a portable plasma-water demonstration setup for high school students, organization of a Chemical Engineering Workshop at a local children’s museum, participation in plasma summer schools, and utilizing social media platforms to create a series of exciting and engaging technical videos to encourage public interest in science.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.

该奖项支持北卡罗来纳州立大学、克拉克森大学和德克萨斯农工大学之间的合作项目，以探索低温等离子体中的化学反应路径。低温等离子体(LTPS)领域包括从微电子制造和人体植入到激光和太阳能电池制造的各种应用。这些技术开发的成功依赖于等离子体产生的离子和自由基的反应。虽然人们已经进行了大量的工作来识别和量化活性氧和氮物种，但等离子体产生的离子和亚稳原子等非氧化物种的产生机制和后续反应在很大程度上是未知的。这些物种已被提议用于一系列独特的等离子体化学转化，包括使用多相气-液等离子体反应器从水中去除有毒的全氟烷基物质和多氟烷基物质(PFAS)，这些物质被称为“永远的化学品”。该项目旨在加快等离子体反应堆的开发和规模，以降解和摧毁全氟辛烷磺酸，并得到等离子体科学与工程领先创新生态系统(ECLIPSE)和可持续发展的关键方面(CAS)：可持续化学的创新解决方案(CAS-SC)计划的支持。该项目旨在阐明常压等离子体与液态水接触时产生的光子、亚稳态、自由基和带电粒子的非氧化化学反应机理和途径。实现这些目标的主要方法包括测量三个流体力学明确的气液等离子体反应器中四种非氧化性含氟化合物的去除率，并将它们与两个不同大气压等离子体喷射设备提供的通量进行关联。这项工作的中心假设是，溶剂化电子和氢自由基是参与非氧化化学转化的关键物种。短链全氟辛烷磺酸降解的潜在机制特别令人感兴趣，因为事实证明，这些化合物的治疗具有极大的挑战性。该项目涉及各级学生，从K-12到毕业生，包括那些来自服务不足社区的学生。主要活动包括为高中生开发便携式等离子-水演示装置，在当地儿童博物馆组织化学工程研讨会，参加等离子暑期学校，以及利用社交媒体平台制作一系列令人兴奋和引人入胜的技术视频以鼓励公众对科学感兴趣。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。