Physics of Fluids - Publications

Three-phase vaporization theory for laser-activated microcapsules

Open Access
Photoacoustics, 100185 (2020)

Authors

	Guillaume Lajoinie
	Mirjam Visscher
	Emilie Blazejewski
	Gert Veldhuis
	Michel Versluis

BibTeΧ

@article{LAJOINIE2020100185,
title = "Three-phase vaporization theory for laser-activated microcapsules.",
journal = "Photoacoustics",
pages = "100185",
year = "2020",
issn = "2213-5979",
doi = "https://doi.org/10.1016/j.pacs.2020.100185",
url = "http://www.sciencedirect.com/science/article/pii/S2213597920300252",
author = "Guillaume Lajoinie and Mirjam Visscher and Emilie Blazejewski and Gert Veldhuis and Michel Versluis",
keywords = "Microcapsules, Thermodynamics, vaporization, cavitation, bubble, photoacoustics, heat transfer",
abstract = "Precision control of vaporization, both in space and time, is critical for numerous applications, including medical imaging and therapy, catalysis and energy conversion, and it can be greatly improved through the use of micro- or nano-sized light absorbers. Ultimately, optimization of these applications also requires a fundamental understanding the vaporization process. Upon laser irradiation, polymeric microcapsules containing a dye can vaporize, leading to the growth of a vapor bubble that emits a strong acoustic signature. Here, we compare laser-activated capsules containing either a volatile or a non-volatile oil core. We theoretically explore the vaporization of the capsules based on a three-phase thermodynamics model, that accounts for the partial vaporization of both the surrounding fluid and the oil core as well as for the interaction between heat transfer and microbubble growth. The model is compared to ultra-high-speed experiments, where we record the cavitation events. Theory and experiments are in convincing agreement."
}