CAREER: Molecular Studies of Phase Separations and Internal Structure in Individual Particles

职业:单个颗粒的相分离和内部结构的分子研究

基本信息

项目摘要

In this project, funded by the Environmental Chemical Sciences program of the Chemistry Division, Professor Andrew Ault of the University of Michigan is studying the properties of individual particles in the atmosphere. These particles can impact cloud formation and properties, as well as health. The tools used are advanced microscopic and spectroscopic characterization. Specifically, the project focuses on particles with two phases (organic and aqueous) and viscous/glassy particles recently observed in the atmosphere whose formation and properties are not well understood. Understanding how these particles change based on key atmospheric variables such as relative humidity and temperature will improve our ability to predict their formation, properties, and abundance in the atmosphere.This project focuses on the fundamental properties of mixed organic/inorganic particles through a series of laboratory studies in sealed environmental reaction cells coupled to two microscopes, a Raman microspectrometer and an atomic force microscopy with infrared (AFM-IR). The studies use a series of model systems (such as ammonium sulfate and dicarboxylic acids), as well a more complex mixtures, chamber-generated particles and particles from the atmosphere. The researchers probe differences within individual particles to understand microscopic changes in physical and chemical properties. Of particular interest are phase separations as a function of particle size, and acidity and reactivity in the microenvironments of phase-separated particles. An outreach program, the Detroit Research Internship Summer Experience (D-RISE), is being expanded. It enables participants to develop interactive activities, such as on particulate matter in the atmosphere, that are presented to classmates the following academic year. In addition to engaging the program participants, this also expands exposure to scientific research to underrepresented groups in the sciences at Detroit high schools. The broader impact of the studies of glassy and phase-separated aerosol are to understand if these particles take up water and nucleate cloud droplets, which is important for cloud formation and properties, as well as if they react with important gases in the atmosphere.
在这个由化学学部环境化学科学项目资助的项目中,密歇根大学的安德鲁·奥尔特教授正在研究大气中单个粒子的特性。这些颗粒会影响云的形成和性质,以及健康。使用的工具是先进的显微镜和光谱表征。具体来说,该项目关注的是最近在大气中观察到的两相颗粒(有机和水相)和粘性/玻璃状颗粒,这些颗粒的形成和性质尚不清楚。了解这些颗粒如何根据关键的大气变量(如相对湿度和温度)变化,将提高我们预测它们在大气中的形成、性质和丰度的能力。该项目通过在密封环境反应细胞中进行一系列实验室研究,重点研究混合有机/无机颗粒的基本性质,并结合两台显微镜,一台拉曼显微光谱仪和一台红外原子力显微镜(AFM-IR)。这些研究使用了一系列模型系统(如硫酸铵和二羧酸),以及更复杂的混合物,室内产生的颗粒和来自大气的颗粒。研究人员探究单个粒子内部的差异,以了解物理和化学性质的微观变化。特别感兴趣的是相分离作为粒度的函数,以及相分离颗粒微环境中的酸度和反应性。一个外展项目,底特律研究实习暑期体验(D-RISE),正在扩大。它使参与者能够开展互动活动,例如大气中的颗粒物,并在下一学年向同学们展示。除了吸引项目参与者之外,这也扩大了对科学研究的接触,使底特律高中科学领域的代表性不足的群体也能接触到科学研究。玻璃状气溶胶和相分离气溶胶研究的更广泛的影响是了解这些颗粒是否吸收水并形成云滴,这对云的形成和性质很重要,以及它们是否与大气中的重要气体发生反应。

项目成果

期刊论文数量(17)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Kinetics and Products of Heterogeneous Hydroxyl Radical Oxidation of Isoprene Epoxydiol-Derived Secondary Organic Aerosol
  • DOI:
    10.1021/acsearthspacechem.3c00073
  • 发表时间:
    2023-09
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    Jin Yan;Yue Zhang;Yuzhi Chen;N. C. Armstrong;Nicolas A. Buchenau;Ziying Lei;Yao Xiao;Zhenfa Zhang;A. Lambe;M. N. Chan;Barbara J. Turpin;A. Gold;A. Ault;J. Surratt
  • 通讯作者:
    Jin Yan;Yue Zhang;Yuzhi Chen;N. C. Armstrong;Nicolas A. Buchenau;Ziying Lei;Yao Xiao;Zhenfa Zhang;A. Lambe;M. N. Chan;Barbara J. Turpin;A. Gold;A. Ault;J. Surratt
Isoprene-Derived Organosulfates: Vibrational Mode Analysis by Raman Spectroscopy, Acidity-Dependent Spectral Modes, and Observation in Individual Atmospheric Particles
  • DOI:
    10.1021/acs.jpca.7b10587
  • 发表时间:
    2018-01-11
  • 期刊:
  • 影响因子:
    2.9
  • 作者:
    Bondy, Amy L.;Craig, Rebecca L.;Ault, Andrew P.
  • 通讯作者:
    Ault, Andrew P.
Direct Determination of Aerosol pH: Size-Resolved Measurements of Submicrometer and Supermicrometer Aqueous Particles
  • DOI:
    10.1021/acs.analchem.8b00586
  • 发表时间:
    2018-10-02
  • 期刊:
  • 影响因子:
    7.4
  • 作者:
    Craig, Rebecca L.;Peterson, Peter K.;Ault, Andrew P.
  • 通讯作者:
    Ault, Andrew P.
Acidity-Dependent Atmospheric Organosulfate Structures and Spectra: Exploration of Protonation State Effects via Raman and Infrared Spectroscopies Combined with Density Functional Theory
酸度依赖的大气有机硫酸盐结构和光谱:通过拉曼和红外光谱结合密度泛函理论探索质子化态效应
  • DOI:
    10.1021/acs.jpca.2c04548
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Fankhauser, Alison M.;Lei, Ziying;Daley, Kimberly R.;Xiao, Yao;Zhang, Zhenfa;Gold, Avram;Ault, Bruce S.;Surratt, Jason D.;Ault, Andrew P.
  • 通讯作者:
    Ault, Andrew P.
The acidity of atmospheric particles and clouds
  • DOI:
    10.5194/acp-20-4809-2020
  • 发表时间:
    2020-04-24
  • 期刊:
  • 影响因子:
    6.3
  • 作者:
    Pye, Havala O. T.;Nenes, Athanasios;Zuend, Andreas
  • 通讯作者:
    Zuend, Andreas
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Andrew Ault其他文献

Godzilla mineral dust and La Soufrière volcanic ash fallout immediately stimulate marine microbial phosphate uptake
哥斯拉矿物尘埃和拉苏弗里耶尔火山灰沉降物立即刺激海洋微生物对磷酸盐的吸收
  • DOI:
    10.3389/fmars.2023.1308689
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    H. Elliott;Kimberly J. Popendorf;Edmund Blades;Haley M Royer;C. G. L. Pollier;A. Oehlert;Ravi Kukkadapu;Andrew Ault;Cassandra J. Gaston
  • 通讯作者:
    Cassandra J. Gaston

Andrew Ault的其他文献

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{{ truncateString('Andrew Ault', 18)}}的其他基金

Collaborative Research: Organosulfate Multiphase Chemistry and Physicochemcal Properties--Oxidation and Sulfate Recycling in Aerosols and Cloud Droplets
合作研究:有机硫酸盐多相化学和物理化学性质——气溶胶和云滴中的氧化和硫酸盐回收
  • 批准号:
    2040610
  • 财政年份:
    2021
  • 资助金额:
    $ 57.5万
  • 项目类别:
    Continuing Grant
Collaborative Research: Impact of Aerosol Viscosity, Phase Separation, and Internal Structure on Isoprene-Derived SOA (Secondary Organic Aerosol) Formation
合作研究:气溶胶粘度、相分离和内部结构对异戊二烯衍生 SOA(二次有机气溶胶)形成的影响
  • 批准号:
    1703019
  • 财政年份:
    2017
  • 资助金额:
    $ 57.5万
  • 项目类别:
    Standard Grant

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