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Online ion mobility spectrometry of nanoparticle formation by non-thermal plasma conversion of metal salts in liquid aerosol droplets

Journal Article · · Journal of Aerosol Science
 [1];  [2];  [3];  [4];  [2]
  1. Università di Bologna, Bologna (Italy). Alma Mater Studiorum. Dept. of Industrial Engineering; Case Western Reserve Univ., Cleveland, OH (United States)
  2. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Chemical and Biomolecular Engineering
  3. Università di Bologna, Bologna (Italy). Alma Mater Studiorum. Dept. of Industrial Engineering; Università di Bologna, Bologna (Italy). Alma Mater Studiorum. Advanced Applications in Mechanical Engineering and Materials Technology. Interdepartmental Center for Industrial Research
  4. Università di Bologna, Bologna (Italy). Alma Mater Studiorum. Dept. of Industrial Engineering; Università di Bologna, Bologna (Italy). Alma Mater Studiorum. Advanced Applications in Mechanical Engineering and Materials Technology. Interdepartmental Center for Industrial Research
The synthesis of nanoparticles by reaction of liquid aerosol droplets containing precursors in a flow-through, atmospheric-pressure, non-thermal plasma offers a continuous, scalable, substrate- and stabilizer-free approach for direct deposition into liquids or onto soft substrates. However, the combination of multiphase and non-equilibrium chemistry makes the process complicated and poorly understood. Here, we present ion mobility spectrometry measurements of liquid water droplets containing silver nitrate passing through an atmospheric-pressure dielectric barrier discharge reactor that allows us to monitor silver nanoparticle formation online for the first time. Mobility diameter distributions were obtained with the plasma on and off, and exhibited a shift, which was related to the degree of conversion of silver nitrate. The silver nanoparticles were also collected and characterized by UV–visible absorbance spectroscopy and transmission electron microscopy to support the online measurements. Importantly, negligible conversion was found when the water was removed by a diffusion dryer, suggesting that the key reducing species are in the liquid phase, such as solvated electrons. Finally, the study demonstrates how ion mobility spectrometry measurements can be applied to provide insight into this approach to nanoparticle synthesis.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0018202
OSTI ID:
1852541
Alternate ID(s):
OSTI ID: 1659538
Journal Information:
Journal of Aerosol Science, Journal Name: Journal of Aerosol Science Journal Issue: C Vol. 150; ISSN 0021-8502
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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