Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Efficiency of Self-Phoretic Propulsion Mechanisms with Surface
  Reaction Heterogeneity   We consider the efficiency of self-phoretic colloidal particles (swimmers) as
a function of the heterogeneity in the surface reaction rate. The set of fluid,
species, and electrostatic continuity equations is solved analytically using a
linearization and numerically using a finite-element method. To compare
spherical swimmers of different size and with heterogeneous catalytic
conversion rates, a 'swimmer efficiency' functional $\eta$ is introduced. It is
proven, that in order to obtain maximum swimmer efficiency the reactivity has
to be localized at the pole(s). Our results also shed light on the sensitivity
of the propulsion speed to details of the surface reactivity, a property that
is notoriously hard to measure. This insight can be utilized in the design of
new self-phoretic swimmers.

2
The categories of this paper are: math
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat