Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle sorting by a structured microfluidic ratchet device with
  tunable selectivity: Theory and Experiment   We theoretically predict and experimentally demonstrate that several
different particle species can be separated from each other by means of a
ratchet device, consisting of periodically arranged triangular (ratchet) shaped
obstacles. We propose an explicit algorithm for suitably tailoring the
externally applied, time-dependent voltage protocol so that one or several,
arbitrarily selected particle species are forced to migrate oppositely to all
the remaining species. As an example we present numerical simulations for a
mixture of five species, labelled according to their increasing size, so that
species 2 and 4 simultaneously move in one direction and species 1, 3, and 5 in
the other. The selection of species to be separated from the others can be
changed at any time by simply adapting the voltage protocol. This general
theoretical concept to utilize one device for many different sorting tasks is
experimentally confirmed for a mixture of three colloidal particle species.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys