Adaptive coatings based on polyaniline for direct 2d observation of diffusion processes in microfluidic systems
Florea, Larisa and Martin-Mayor, Alain and Bou-Ali, Mounir M. and Meagher, Kate and Diamond, Dermot and Tutar, Mustafa and Benito-Lopez, Fernando (2016) Adaptive coatings based on polyaniline for direct 2d observation of diffusion processes in microfluidic systems. Sensors and Actuators B: Chemical, 231 . pp. 744-751. ISSN 0925-4005
Full text available as:
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) discretization 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.
Archive Staff Only: edit this record