Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport-induced inversion of screening ionic charges in nanochannels   This work reveals a counter-intuitive but basic process of ionic screening in
nano-fluidic channels. Steady-state numerical simulations and mathematical
analysis show that, under significant longitudinal ionic transport, the
screening ionic charges can be locally inverted in the channels: their charge
sign becomes the same as that of the channel surface charges. The process is
identified to originate from the coupling of ionic electro-diffusion transport
and junction 2-D electrostatics. This finding may expand our understanding on
ionic screening and electrical double layers in nano-channels. Furthermore, the
charge inversion process results in a body-force torque on channel fluids,
which is a possible mechanism for vortex generation in the channels and their
nonlinear current-voltage characteristics.

24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat