Poster (Scientific congresses and symposiums)
Successive Droplets Encapsulation Revealed by Optofluidics
Lismont, Marjorie; Robert, Damien; Vandewalle, Nicolas et al.
2013American Physical Society - 66th annual DFD Meeting
 

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Abstract :
[en] Digital microfluidics: an easy way to encapsulate successively water droplets by oil. Digital microfluidics is implemented to coat successively water droplets with a thin layer of silicon oil. Small water droplets are settled at three fibers nodes while a larger oil drop slides down the vertical fiber. Optofluidics: an interesting way to reveal the droplet sliding motion and the encapsulation. To distinguish the different fluids, quantum dots (QDs) and rhodamine labelled polystyrene beads are diluted in oil and water, respectively.These two fluorescent probes are lighted by a 532 nm radiation.The fluorescence signal is recorded by a high speed camera, perpendicularly to the laser and to the fibers network. This set-up reveals that the oil drop passes through the water droplets without removing them from the nodes, leaving a thin oil layer around the water droplets. The coating, clearly seen on top pictures of Fig 2, prevents water evaporation. The key parameters for a good encapsulation are the fiber diameter and the oil viscosity that determine droplets size and velocity, respectively.
Disciplines :
Physics
Author, co-author :
Lismont, Marjorie ;  Université de Liège - ULiège > Département de physique > Biophotonique
Robert, Damien;  Université de Liège - ULiège > Département de Physique
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Dreesen, Laurent ;  Université de Liège - ULiège > Département de physique > Biophotonique
Language :
English
Title :
Successive Droplets Encapsulation Revealed by Optofluidics
Publication date :
November 2013
Event name :
American Physical Society - 66th annual DFD Meeting
Event place :
Pittsburgh, United States
Event date :
24 Novembre 2013 au 26 Novembre 2013
Audience :
International
Available on ORBi :
since 13 September 2014

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