We analyze the influence of surface heterogeneity, inducing a random-potential at the walls in electroosmotic incompressible flows. Specifically, we focus on how surface heterogeneity modifies the physico-chemical processes (transport, chemical reaction, mixing) occurring in microchannel and microreactors. While the macroscopic short-time features associated with solute transport (e.g. chromatographic patterns) do not depend significantly on zeta-potential heterogeneity, spatial randomness in the surface zeta-potential modifies the spectral properties of the advection diffusion operator, determining different long-term properties of transport/reaction phenomena compared to the homogeneous case. Examples of physical relevance (chromatography, infinitely fast reactions) are addressed. (c) 2007 Elsevier B.V. All rights reserved.
Influence of surface heterogeneity in electroosmotic flows-Implications in chromatography, fluid mixing, and chemical reactions in microdevices / Adrover, Alessandra; Giona, Massimiliano; Pagnanelli, Francesca; Toro, Luigi. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - 253:13 SPEC. ISS.(2007), pp. 5785-5790. (Intervento presentato al convegno 6th International Symposiium on Effects of Surface Heterogeneity in Adsorption and Catalysis on Solids tenutosi a Zakopane, POLAND nel AUG 28-SEP 02, 2006) [10.1016/j.apsusc.2006.12.067].
Influence of surface heterogeneity in electroosmotic flows-Implications in chromatography, fluid mixing, and chemical reactions in microdevices
ADROVER, Alessandra;GIONA, Massimiliano;PAGNANELLI, Francesca;TORO, Luigi
2007
Abstract
We analyze the influence of surface heterogeneity, inducing a random-potential at the walls in electroosmotic incompressible flows. Specifically, we focus on how surface heterogeneity modifies the physico-chemical processes (transport, chemical reaction, mixing) occurring in microchannel and microreactors. While the macroscopic short-time features associated with solute transport (e.g. chromatographic patterns) do not depend significantly on zeta-potential heterogeneity, spatial randomness in the surface zeta-potential modifies the spectral properties of the advection diffusion operator, determining different long-term properties of transport/reaction phenomena compared to the homogeneous case. Examples of physical relevance (chromatography, infinitely fast reactions) are addressed. (c) 2007 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
