SGER: THE EFFECTS OF TEMPERATURE AND CONDUCTIVITY ON AQUEOUS PHASE ELECTRICAL DISCHARGE

SGER：温度和电导率对水相放电的影响

• 批准号: 0839984
• 负责人: Bruce Locke
• 金额: --
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0839984&HistoricalAwards=false
• 关键词: SGER; EFFECTS; TEMPERATURE; CONDUCTIVITY; AQUEOUS

CBET-0839984LockeA one-year exploratory research project builds on preliminary work studying electrical discharges in water. Such discharges are of fundamental and practical interest for various chemical, biomedical, and environmental applications. The key preliminary observation was that H2O2 is formed more slowly near the boiling point of low-conductivity water, where the discharge occurs in small water-vapor bubbles, and in higher-conductivity water, where the discharge appears to form and propagate on the inside of large water-vapor bubbles. H2O2 is used as an indirect indicator of the formation of the active OH radicals. The central hypothesis of the present work is that the much smaller density of water molecules in the bubble phase than in the condensed liquid phase causes the reduced H2O2. In the research, H2, O2, H2O2, and OH formation will first be measured as functions of solution conductivity (up to 2000 ìS/cm), of temperature to 100 C, of the exposed area of the needle electrode, and of addition of various other gases (argon and oxygen) bubbled into the solution. The measurements of formation rates and stoichiometry will then used to test the mathematical model of electrical discharge channels in water previously reported by the group.A basic understanding of electrical discharge in water near the boiling point should provide insight into the fundamental processes occurring in electrical discharge in water and in gas-liquid environments and can lead to insight into how to develop such discharges for practical use. Previous work has provided key information on the formation of electrical discharges in liquid water under ambient temperature and pressure conditions. However, while the effects of elevated pressure on liquid-phase water discharges have been reported, no previous work has been reported on electrical discharge in high-temperature water; that is, near boiling.

CBET-0839984 Locke为期一年的探索性研究项目建立在研究水中放电的前期工作基础上。这种放电在各种化学、生物医学和环境应用中具有重要的基础和实用价值。关键的初步观察是，在低电导率水的沸点附近，过氧化氢的形成速度较慢，在那里，放电发生在小的水蒸气气泡中，而在高电导率的水中，放电似乎在大的水蒸气气泡的内部形成和传播。H_2O_2被用作活性OH自由基形成的间接指示剂。目前工作的中心假设是，气泡相中的水分子密度比凝聚液相中的水分子密度小得多，这导致了过氧化氢的减少。在研究中，H_2、O_2、H_2O_2和OH的生成将首先被测量为溶液电导率(高达2,000？S/厘米)、温度到100℃、针电极暴露面积以及向溶液中添加各种其他气体(气体和氧气)的函数。然后，形成速率和化学计量的测量将被用来检验该小组以前报告的水中放电通道的数学模型。对沸点附近的水中的放电的基本了解应该有助于深入了解水中和气液环境中发生的放电的基本过程，并能够深入了解如何开发用于实际用途的这种放电。以前的工作已经提供了关于在环境温度和压力条件下在液态水中形成放电的关键信息。然而，尽管压力升高对液态水放电的影响已有报道，但在高温水中，也就是接近沸腾的情况下，还没有关于放电的报道。