Journal article
Correlating 3D Morphology, Phase State, and Viscoelastic Properties of Individual Substrate-Deposited Particles
Analytical chemistry (Washington), Vol.91(12), pp.7621-7630
06/18/2019
DOI: 10.1021/acs.analchem.9b00333
PMID: 31117402
Abstract
Depending on the source and relative humidity, aerosols can have different compositional, morphological, and viscoelastic properties. Aerosol studies determining the relationship between these properties and their combined effect on the climate and environment are important. This work aims to correlate the 3D morphology, phase state, and viscoelastic properties of selected single-component chemical systems found in sea spray aerosol (SSA) that were substrate-deposited on a solid surface, studied with atomic force microscopy (AFM). Specifically, two inorganic salts (NaCl and MgSO
), four organic acids (malonic, glutaric, azelaic, and palmitic acids), three saccharides (glucose, sucrose, and raffinose), and lipopolysaccharide from Escherichia coli were studied. Furthermore, three inorganic-organic binary chemical mixtures (NaCl-malonic acid, NaCl-glucose, and MgSO
-glucose) at 1:3 and 3:1 mass ratio were studied. AFM imaging and force spectroscopy at 20% relative humidity were performed to record 3D height images of individual particles and measure force-distance plots, respectively. First, by utilizing combined relative indentation depth (RID) and viscoelastic response distance (VRD) data obtained from the force-distance plots, we establish quantitative framework toward differentiation of the solid, semisolid and liquid phase states of individual particles without prior knowledge of their chemical identity. Second, we show that the single particle aspect ratio (AR) of a wide range of compounds relevant to SSA is a measure of the extent of the particle spreading as a result of impaction with the solid substrate, which can be directly related to the RID and VRD results. Thus, we demonstrate that a quick height imaging and determination of a single particle AR can be used to assess the phase state. Therefore, we introduce the ability to semiquantitatively assess the phase states of individual substrate deposited particles of SSA-relevant compounds, irrespective of the microscopy technique used, which can subsequently be further validated by more quantitative AFM force spectroscopy.
Details
- Title: Subtitle
- Correlating 3D Morphology, Phase State, and Viscoelastic Properties of Individual Substrate-Deposited Particles
- Creators
- Kamal K Ray - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United StatesHansol D Lee - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United StatesMiguel A Gutierrez Jr - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United StatesFranklin J Chang - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United StatesAlexei V Tivanski - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United States
- Resource Type
- Journal article
- Publication Details
- Analytical chemistry (Washington), Vol.91(12), pp.7621-7630
- DOI
- 10.1021/acs.analchem.9b00333
- PMID
- 31117402
- ISSN
- 0003-2700
- eISSN
- 1520-6882
- Grant note
- DOI: 10.13039/100000165, name: Division of Chemistry, award: 1801971
- Language
- English
- Date published
- 06/18/2019
- Academic Unit
- Chemistry
- Record Identifier
- 9984216616102771
Metrics
16 Record Views