Influence of surface heterogeneity in electroosmotic flows—Implications in chromatography, fluid mixing, and chemical reactions in microdevices |
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Authors: | Alessandra Adrover Francesca Pagnanelli Luigi Toro |
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Institution: | a Università di Roma La Sapienza, Dipartimento di Ingegneria Chimica, Facoltà di Ingegneria, via Eudossiana 18, 00184 Roma, Italy b Università di Roma La Sapienza, Dipartimento di Chimica, Facoltà di Scienze Matematiche Fisiche e Naturali, piazzale Aldo Moro 5, 00185 Roma, Italy |
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Abstract: | We analyze the influence of surface heterogeneity, inducing a random ζ-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 ζ-potential heterogeneity, spatial randomness in the surface ζ-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. |
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