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The structure of D₂O-nonane nanodroplets
Harshad Pathak1, Abdalla Obeidat2, Gerald Wilemski2
1William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA.
The Journal of Chemical Physics
|June 16, 2014
Summary
Researchers studied deuterated water-nonane aerosol droplets using small angle X-ray scattering. Results show a nonane lens on a deuterated water sphere, not a core-shell structure, for these nanodroplets.
Area of Science:
- Physical Chemistry
- Materials Science
- Aerosol Science
Background:
- Understanding the internal structure of aerosol droplets is crucial for atmospheric science and materials applications.
- Nanometer-sized droplets formed in supersonic expansions present unique structural challenges.
Purpose of the Study:
- To elucidate the internal structure of deuterated water (D2O)-nonane aerosol droplets.
- To determine if droplets form core-shell structures or other configurations.
Main Methods:
- Formation of D2O-nonane aerosol droplets in supersonic nozzle expansions.
- Small angle X-ray scattering (SAXS) for structural analysis.
- Fourier transform infra-red spectroscopy (FTIR) for complementary data.
Main Results:
- SAXS data analysis ruled out mixed droplets with aqueous core-organic shell structures.
- Experimental results strongly supported a spherically asymmetric lens-on-sphere model.
- The best fit indicated a nonane lens on a D2O sphere with a contact angle between 40°-120°.
Conclusions:
- The internal structure of D2O-nonane aerosol droplets is a nonane lens on a D2O sphere.
- This configuration differs from typical aqueous core-organic shell models.
- The findings provide critical insights into droplet self-assembly and interfacial phenomena.
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