Single Particle Investigation of Environmental Chemical Processes using Nano-Impact Collision Techniques

使用纳米碰撞碰撞技术对环境化学过程进行单粒子研究

• 批准号: 1610281
• 负责人: Emanuela Andreescu
• 金额: $ 39万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1610281&HistoricalAwards=false
• 关键词: Single; Particle; Investigation; Environmental; Chemical

In this project funded by the Environmental Chemical Sciences Program, Professor E. Silvana Andreescu of Clarkson University is studying the chemical processes that occur at the surface of individual nanoparticles upon exposure to environmental contaminants. To meet this challenge, a new method based on measurements of the collision events of nanoparticles with a microelectrode is developed. The integrated characterizational approach can be used to assess nanoparticle stability and predict their change as a result of exposure to the environment. These studies provide new data for understanding the relationship between nanoparticle properties and their behavior under environmental conditions. Since nanoparticles are used in many consumer products (such as soaps and make-up), increasing our knowledge of their changes in the environmental has significant economic and societal implications. This research provides training for graduate and undergraduate students, especially women and minorities, who have demonstrated significant promise for career development and leadership. The project also provides undergraduate research experience to underrepresented minority students from three 4-year public colleges that usually do not have access to research to broaden their education.The project focuses on the development of a new electrochemical collision method for the investigation of the surface properties, size-dependent effects and redox reactivity of model metal and metal oxide nanoparticles. Changes in oxidation state, surface adsorption / desorption and reaction kinetics are evaluated using collision electrochemistry and the results are correlated with a suite of spectroscopic and surface characterization methods. These experiments determines how environmental constituents and solution chemistry affect the surface properties and reactivity of individual nanoparticles, and establish the mechanism of these interactions. The development of a new methodology for studying nanoparticles by collision electrochemistry has potential for broad application as a complementary and inexpensive tool for particle characterization and environmental screening purposes. These studies provide new data for understanding the relationship between nanoparticle characteristics and their behavior under environmental conditions.

在由环境化学科学计划资助的该项目中，克拉克森大学的E. Silvana Andreescu教授正在研究暴露于环境污染物的各个纳米颗粒表面发生的化学过程。为了应对这一挑战，开发了一种基于对纳米颗粒碰撞事件与微电极的碰撞事件的测量的新方法。综合特征方法可用于评估纳米颗粒稳定性，并预测其因环境暴露而变化。 这些研究提供了新数据，以了解纳米颗粒性质及其在环境条件下的行为之间的关系。由于纳米颗粒用于许多消费产品（例如肥皂和化妆），因此我们对环境变化的了解具有重大的经济和社会意义。这项研究为研究生和本科生，尤其是妇女和少数民族提供了培训，这些培训对职业发展和领导表现出了巨大的希望。该项目还为来自三个4年公立大学的代表性不足的少数族裔学生提供了本科生的研究经验，这些学生通常无法获得研究以扩大其教育。该项目着重于开发一种新的电化学碰撞方法，以研究表面特性，尺寸依赖性依赖性的尺寸和金属氧化物NANANOPAREPARECTICT的尺寸依赖性效应和氧化能力反应性。使用碰撞电化学评估氧化状态，表面吸附 /解吸和反应动力学的变化，结果与光谱和表面表征方法相关。这些实验决定了环境成分和溶液化学如何影响单个纳米颗粒的表面特性和反应性，并建立了这些相互作用的机制。通过碰撞电化学研究纳米颗粒的新方法的开发具有广泛应用，作为粒子表征和环境筛查目的的互补和廉价工具。这些研究提供了新数据，以了解纳米颗粒特征及其在环境条件下的行为之间的关系。