“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 17259 |
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The electrokinetic transport in a neutral system consists of an aqueous NaCl solution confined in a nanochannel with two similar parallel
phosphorene walls and is investigated for different black, blue, red, and green phosphorene allotropes in the presence of an external electric
field in the directions x (parallel to the walls roughness axis) and y (perpendicular to the walls roughness axis). The results show that
irrespective of the electric field direction, the thickness of the Stern layer increases with the increase in the magnitude of the negative electric
surface charge density (ESCD) on the nanochannel walls, and it also increases with the increase in the roughness ratio for different
allotropes. Moreover, three different regimes of Debyeâ??Huckel (DH), intermediate, and flow reversal appear as the absolute value of the â?ì
negative ESCD on the walls grows. With the increase in the absolute value of the negative ESCD, in the DH regime, the flow velocity grows,
then in the intermediate regime, it decreases, and finally, at sufficiently high ESCD, the flow reversal occurs. When the external electric field
is applied in the y direction, the dynamics of the system are slower than that of the x direction; therefore, the flow reversal occurs at the
smaller absolute values of the negative ESCD
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