article · 15/02/2018
Quasistatic Microdroplet Production in a Capillary Trap
Résumé
We develop a method to produce aqueous microdroplets in an oil phase, based on the periodic extraction of a pending droplet across the oil-air interface. This interface forms a capillary trap inside which a droplet can be captured and detached. This process is found to be capillary based and quasistatic. The droplet size and emission rate are independently governed by the injected volume per cycle and the extraction frequency. We find that the minimum droplet diameter is close to the injection glass-capillary diameter and that variations in surface tension moderately perturb the droplet size. A theoretical model based on surface energy minimization in the oil-water-air phases is derived and captures the experimental results. This method enables robust, versatile, and tunable production of microdroplets at low production rates.
Citer cet article
Valet, M., Pontani, L.-L., Prevost, A., & Wandersman, E. (2018). Quasistatic Microdroplet Production in a Capillary Trap. Phys. Rev. Applied, 9, 014002. https://doi.org/https://doi.org/10.1103/PhysRevApplied.9.014002@article{Valet2018_268,
author = {Valet, Manon and Pontani, Léa-Laetitia and Prevost, Alexis and Wandersman, Elie},
year = {2018},
month = {2},
title = {Quasistatic Microdroplet Production in a Capillary Trap},
journal = {Phys. Rev. Applied},
volume = {9},
pages = {014002},
abstract = {We develop a method to produce aqueous microdroplets in an oil phase, based on the periodic extraction of a pending droplet across the oil-air interface. This interface forms a capillary trap inside which a droplet can be captured and detached. This process is found to be capillary based and quasistatic. The droplet size and emission rate are independently governed by the injected volume per cycle and the extraction frequency. We find that the minimum droplet diameter is close to the injection glass-capillary diameter and that variations in surface tension moderately perturb the droplet size. A theoretical model based on surface energy minimization in the oil-water-air phases is derived and captures the experimental results. This method enables robust, versatile, and tunable production of microdroplets at low production rates.},
url = {https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.9.014002},
doi = {https://doi.org/10.1103/PhysRevApplied.9.014002},
}TY - JOUR
AU - Valet, Manon
AU - Pontani, Léa-Laetitia
AU - Prevost, Alexis
AU - Wandersman, Elie
PY - 2018
DA - 2018/02/15
TI - Quasistatic Microdroplet Production in a Capillary Trap
JO - Phys. Rev. Applied
VL - 9
AB - We develop a method to produce aqueous microdroplets in an oil phase, based on the periodic extraction of a pending droplet across the oil-air interface. This interface forms a capillary trap inside which a droplet can be captured and detached. This process is found to be capillary based and quasistatic. The droplet size and emission rate are independently governed by the injected volume per cycle and the extraction frequency. We find that the minimum droplet diameter is close to the injection glass-capillary diameter and that variations in surface tension moderately perturb the droplet size. A theoretical model based on surface energy minimization in the oil-water-air phases is derived and captures the experimental results. This method enables robust, versatile, and tunable production of microdroplets at low production rates.
SP - 014002
DO - https://doi.org/10.1103/PhysRevApplied.9.014002
UR - https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.9.014002
ER -