Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope
The viscosity of atmospheric aerosol particles determines the equilibrium timescale at which a molecule diffuses into and out of particles, influencing processes such as gas–particle partitioning, light scattering, and cloud formation that can affect air quality and climate. This particle viscosity...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/12/11/1476 |
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| author | Yiming Qin Jianhuai Ye Paul Ohno Theodora Nah Scot T. Martin |
| author_facet | Yiming Qin Jianhuai Ye Paul Ohno Theodora Nah Scot T. Martin |
| author_sort | Yiming Qin |
| collection | DOAJ |
| description | The viscosity of atmospheric aerosol particles determines the equilibrium timescale at which a molecule diffuses into and out of particles, influencing processes such as gas–particle partitioning, light scattering, and cloud formation that can affect air quality and climate. This particle viscosity is sensitive to environmental conditions such as relative humidity and temperature. Current experimental techniques mainly characterize aerosol viscosity at room temperature. The influence of temperature on the viscosity of organic aerosol remains underexplored. Herein, the viscosity of atmospherically relevant organic materials was examined at a range of temperatures from 15 °C to 95 °C using an atomic force microscope (AFM) equipped with a temperature-controlled sample module. Dioctyl phthalate and sucrose were selected for investigation. Dioctyl phthalate served as the proxy for atmospherically relevant primary organic materials while sucrose served as the proxy for secondary organic materials. The resonant frequency responses of the AFM cantilever within dioctyl phthalate and sucrose were recorded. The link between the resonant frequency and material viscosity was established via a hydrodynamic function. Results obtained from this study were consistent with previously reported viscosities, thus demonstrating the critical capability of AFM in temperature-dependent viscosity measurements. |
| first_indexed | 2024-03-10T05:42:24Z |
| format | Article |
| id | doaj.art-97e9b01f2d494460805a08fc7b7c39fe |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T05:42:24Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-97e9b01f2d494460805a08fc7b7c39fe2023-11-22T22:24:58ZengMDPI AGAtmosphere2073-44332021-11-011211147610.3390/atmos12111476Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force MicroscopeYiming Qin0Jianhuai Ye1Paul Ohno2Theodora Nah3Scot T. Martin4School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USASchool of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USASchool of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USASchool of Energy and Environment, City University of Hong Kong, Hong Kong 518057, ChinaSchool of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USAThe viscosity of atmospheric aerosol particles determines the equilibrium timescale at which a molecule diffuses into and out of particles, influencing processes such as gas–particle partitioning, light scattering, and cloud formation that can affect air quality and climate. This particle viscosity is sensitive to environmental conditions such as relative humidity and temperature. Current experimental techniques mainly characterize aerosol viscosity at room temperature. The influence of temperature on the viscosity of organic aerosol remains underexplored. Herein, the viscosity of atmospherically relevant organic materials was examined at a range of temperatures from 15 °C to 95 °C using an atomic force microscope (AFM) equipped with a temperature-controlled sample module. Dioctyl phthalate and sucrose were selected for investigation. Dioctyl phthalate served as the proxy for atmospherically relevant primary organic materials while sucrose served as the proxy for secondary organic materials. The resonant frequency responses of the AFM cantilever within dioctyl phthalate and sucrose were recorded. The link between the resonant frequency and material viscosity was established via a hydrodynamic function. Results obtained from this study were consistent with previously reported viscosities, thus demonstrating the critical capability of AFM in temperature-dependent viscosity measurements.https://www.mdpi.com/2073-4433/12/11/1476viscositytemperature-dependentatomic force microscope |
| spellingShingle | Yiming Qin Jianhuai Ye Paul Ohno Theodora Nah Scot T. Martin Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope Atmosphere viscosity temperature-dependent atomic force microscope |
| title | Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope |
| title_full | Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope |
| title_fullStr | Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope |
| title_full_unstemmed | Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope |
| title_short | Temperature-Dependent Viscosity of Organic Materials Characterized by Atomic Force Microscope |
| title_sort | temperature dependent viscosity of organic materials characterized by atomic force microscope |
| topic | viscosity temperature-dependent atomic force microscope |
| url | https://www.mdpi.com/2073-4433/12/11/1476 |
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