Broadening of neutral analyte band in electroosmotic flow through slit channel with different zeta potentials of the walls
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Data publicació2013-07
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Abstract
The study is concerned with addressing
hydrodynamic dispersion of an electroneutral non-adsorbed
solute being transported by electroosmotic flow through a
slit channel formed by walls with different zeta potentials.
The analysis is conducted in terms of the plate height
which, using the Van Deemter equation, can be expressed
through the cross-sectional mean flow velocity, the solute
molecular diffusion coefficient and a length scale param-
eter having meaning of the minimum achievable plate
height and depending on the velocity distribution within
the channel cross-section. The minimum plate height is
determined by substituting distribution of electroosmotic
velocity into the preliminary derived integral expression
that is valid for any given velocity distribution within a slit
channel cross-section. The electroosmotic velocity distri-
bution within the slit channel cross-section is obtained by
solving one-dimensional version of the Stokes equation
accounting for electric force exerted on the local equilib-
rium electric space charge. The major obtained result is an
analytical expression which represents the minimum plate
height normalized by half of channel width as a function
of two dimensionless parameters, namely, half of channel width normalized by the Debye length, and the ratio of the
wall zeta potentials. The obtained result reveals a sub-
stantial increase in the minimum plate height compared
with the case of equal wall zeta potentials. Different lim-
iting cases of the obtained relationships are analyzed and
possible applications are discussed.
CitacióZholkovskij, E.; Masliyah, J.; Yaroshchuk, A. Broadening of neutral analyte band in electroosmotic flow through slit channel with different zeta potentials of the walls. "Microfluidics and nanofluidics", Juliol 2013, vol. 15, núm. 1, p. 35-47.
ISSN1613-4982
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art%3A10.1007%2Fs10404-012-1118-0.pdf | 630,0Kb | Accés restringit |