Título
Adaptive coatings based on polyaniline for direct 2D observation of diffusion processes in microfluidic systemsOtras instituciones
Dublin City UniversityIkerbasque
Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU)
Versión
Postprint
Derechos
© 2016 Elsevier B.V. All rights reserved.Acceso
Acceso abiertoVersión del editor
http://dx.doi.org/10.1016/j.snb.2016.03.085Publicado en
Sensors and Actuators B: Chemical Vol. 231. Pp. 744-751. August, 2016Primera página
744Última página
751Editor
ElsevierPalabras clave
Polyaniline
Mixing process
Adaptive coatings
Optical sensor ... [+]
Mixing process
Adaptive coatings
Optical sensor ... [+]
Polyaniline
Mixing process
Adaptive coatings
Optical sensor
Microfluidics
Computational fluid dynamics
(CFD) [-]
Mixing process
Adaptive coatings
Optical sensor
Microfluidics
Computational fluid dynamics
(CFD) [-]
Resumen
Microfluidic devices are poised to dramatically influence the future of the process industry. Therefore the understanding and proper evaluation of the flow and mixing behaviour at microscale becomes a ... [+]
Microfluidic devices are poised to dramatically influence the future of the process industry. Therefore the understanding and proper evaluation of the flow and mixing behaviour at microscale becomes a very important issue. In this study, the diffusion behaviour of two reacting solutions of HCl and NaOH were directly observed in a glass/polydimethylsiloxane microfluidic device using adaptive coatings based on the conductive polymer polyaniline that are covalently attached to the microchannel walls. The two liquid streams were combined at the junction of a Y-shaped microchannel, and allowed to diffuse into each other and react. The results showed excellent correlation between optical observation of the diffusion process and the numerical results. A numerical model which is based on finite volume method (FVM) discretisation of steady Navier-Stokes (fluid flow) equations and mass transport equations without reactions was used to calculate the flow variables at discrete points in the finite volume mesh element. The high correlation between theory and practical data indicates the potential of such coatings to monitor diffusion processes and mixing behaviour inside microfluidic channels in a dye free environment. [-]
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