Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sequential tasks performed by catalytic pumps for colloidal
  crystallization   Gold-platinum catalytic pumps immersed in a chemical fuel are used to
manipulate silica colloids. The manipulation relies on the electric field and
the fluid flow generated by the pump. Catalytic pumps perform various tasks,
such as the repulsion of colloids, the attraction of colloids, and the guided
crystallization of colloids. We demonstrate that catalytic pumps can execute
these tasks sequentially over time. Switching from one task to the next is
related to the local change of the proton concentration, which modifies the
colloid zeta potential and consequently the electric force acting on the
colloids.

24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
18
The categories of this paper are: econ
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph