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- W3200168839 abstract "The effects of atmospheric aerosols on the climate and atmosphere of Earth can vary significantly depending upon their properties, including size, morphology, and phase state, all of which are influenced by varying relative humidity (RH) in the atmosphere. A significant fraction of atmospheric aerosols is below 100 nm in size. However, as a result of size limitations of conventional experimental techniques, how the particle-to-particle variability of the phase state of aerosols influences atmospheric processes is poorly understood. To address this issue, the atomic force microscopy (AFM) methodology that was previously established for sub-micrometer aerosols is extended to measure the water uptake and identify the phase state of individual sucrose nanoparticles. Quantified growth factors (GFs) of individual sucrose nanoparticles up to 60% RH were lower than expected values observed on the sub-micrometer sucrose particles. The effect could be attributed to the semisolid sucrose nanoparticle restructuring on a substrate. At RH > 60%, sucrose nanoparticles are liquid and GFs overlap well with the sub-micrometer particles and theoretical predictions. This suggests that quantification of GFs of nanoparticles may be inaccurate for the RH range where particles are semisolid but becomes accurate at elevated RH where particles are liquid. Despite this, however, the identified phase states of the nanoparticles were comparable to their sub-micrometer counterparts. The identified phase transitions between solid and semisolid and between semisolid and liquid for sucrose were at ∼18 and 60% RH, which are equivalent to viscosities of 1011.2 and 102.5 Pa s, respectively. This work demonstrates that measurements of the phase state using AFM are applicable to nanosized particles, even when the substrate alters the shape of semisolid nanoparticles and alters the GF." @default.
- W3200168839 created "2021-09-27" @default.
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- W3200168839 creator A5072215866 @default.
- W3200168839 date "2021-09-10" @default.
- W3200168839 modified "2023-09-29" @default.
- W3200168839 title "Probing the Water Uptake and Phase State of Individual Sucrose Nanoparticles Using Atomic Force Microscopy" @default.
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- W3200168839 doi "https://doi.org/10.1021/acsearthspacechem.1c00101" @default.
- W3200168839 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8543754" @default.
- W3200168839 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34712889" @default.
- W3200168839 hasPublicationYear "2021" @default.
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