Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Forced generation of simple and double emulsions in all-aqueous system   We report an easy-to-implement method that allows the direct generation of
water-in-water (w/w) single emulsions. The method relies on direct perturbation
of the pressure that drives the flow of the dispersed phase of the emulsions.
The resultant inner jet is induced to break up into droplets due to the growth
of the perturbation through Rayleigh-Plateau instability [L. Rayleigh, Proc. R.
Soc. London 29, 71-97 (1879)]; this leads to the formation of monodisperse
droplets. By implementing this method on a modified microfluidic device, we
directly generate water-in-water-in-water (w/w/w) double emulsions with good
control over the size and the number of encapsulated droplets. Our approach
suggests a new route to apply droplet-based microfluidics to completely
water-based systems.

34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga