Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colloidal electro-phoresis in the presence of symmetric and asymmetric
  electro-osmotic flow   We characterize the electro-phoretic motion of charged sphere suspensions in
the presence of substantial electro-osmotic flow using a recently introduced
small angle super-heterodyne dynamic light scattering instrument (ISASH-LDV).
Operation in integral mode gives access to the particle velocity distribution
over the complete cell cross-section. Obtained Doppler spectra are evaluated
for electro-phoretic mobility, wall electro-osmotic mobility and particle
diffusion coefficient. Simultaneous measurements of differing electro-osmotic
mobilities leading to asymmetric solvent flow are demonstrated in a custom made
electro-kinetic cell fitting standard microscopy slides as exchangeable
sidewalls. Scope and range of our approach are discussed demonstrating the
possibility of an internal calibration standard and using the simultaneously
measured electro-kinetic mobilities in the interpretation of microfluidic
pumping experiment involving an inhomogeneous electric field and a complex
solvent flow pattern.

1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci