Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contactless Manipulation of Binary Droplets via Sensing of Localized
  Vapor Sources   Droplet motion on surfaces influences phenomena as diverse as microfluidic
liquid handling, printing technology and micro-organism migration. Typically,
droplet motion is achieved by inducing energy gradients on a substrate or flow
on the droplet's free surface. Current configurations for droplet manipulation
have, however, limited applicability as they rely on carefully tailored
wettability gradients and/or bespoke substrates. Here we demonstrate the
contactless long-range manipulation of binary droplets on pristine substrates
due to the sensing of localized water vapor sources. We show with analytical
considerations that the dissipative nature of the driving forces at play,
induced by tiny asymmetries in surface tension gradients, is essential to
capture the droplet's manipulation mechanism. We then demonstrate its
versatility by printing, aligning and reacting materials controllably in space
and time.

23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex