Projects per year
Abstract
Aerosols are key components of the atmosphere and play important roles in many industrial processes. Because aerosol particles have high surface-to-volume ratios, their surface properties are especially important. However, direct measurement of the surface properties of aerosol particles is challenging. In this work, we describe an approach to measure the surface tension of picoliter volume droplets with surface age <1 ms by resolving their dynamic oscillations in shape immediately after ejection from a microdroplet dispenser. Droplet shape oscillations are monitored by highly time-resolved (500 ns) stroboscopic imaging, and droplet surface tension is accurately retrieved across a wide range of droplet sizes (10-25 μm radius) and surface ages (down to ∼100 μs). The approach is validated for droplets containing sodium chloride, glutaric acid, and water, which all show no variation in surface tension with surface age. Experimental results from the microdroplet dispenser approach are compared to complementary surface tension measurements of 5-10 μm radius droplets with aged surfaces using a holographic optical tweezers approach and predictions of surface tension using a statistical thermodynamic model. These approaches combined will allow investigation of droplet surface tension across a wide range of droplet sizes, compositions, and surface ages.
Original language | English (US) |
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Pages (from-to) | 3021-3029 |
Number of pages | 9 |
Journal | Journal of Physical Chemistry A |
Volume | 123 |
Issue number | 13 |
DOIs | |
State | Published - Apr 4 2019 |
Bibliographical note
Publisher Copyright:© 2019 American Chemical Society.
MRSEC Support
- Shared
PubMed: MeSH publication types
- Journal Article
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Dive into the research topics of 'Surface Tensions of Picoliter Droplets with Sub-Millisecond Surface Age'. Together they form a unique fingerprint.Projects
- 2 Finished
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MRSEC IRG-3: Hierarchical Multifunctional Macromolecular Materials
Reineke, T. M. (Coordinator), Bates, F. S. (Senior Investigator), Dorfman, K. (Senior Investigator), Dutcher, C. S. (Senior Investigator), Hillmyer, M. A. (Senior Investigator), Lodge, T. P. (Senior Investigator), Morse, D. C. (Senior Investigator), Siepmann, I. (Senior Investigator), Barreda, L. (Researcher) & Ganewatta, M. S. (Researcher)
11/1/14 → 10/31/20
Project: Research project
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University of Minnesota MRSEC (DMR-1420013)
Lodge, T. P. (PI)
11/1/14 → 10/31/20
Project: Research project