Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrostatic Repulsion of Positively Charged Vesicles and Negatively
  Charged Objects   A positively charged, mixed bilayer vesicle in the presence of negatively
charged surfaces (for example, colloidal particles) can spontaneously partition
into an adhesion zone of definite area, and another zone that repels additional
negative objects. Although the membrane itself has nonnegative charge in the
repulsive zone, negative counterions on the interior of the vesicle
spontaneously aggregate there, and present a net negative charge to the
exterior. Beyond the fundamental result that oppositely charged objects can
repel, our mechanism helps explain recent experiments on surfactant vesicles.

30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int