alexa Microfluidic synthesis of colloidal silica.

Journal of Bioengineering and Bioelectronics

Author(s): Khan SA, Gnther A, Schmidt MA, Jensen KF

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Abstract We demonstrate the design, fabrication, and operation of microfluidic chemical reactors for the synthesis of colloidal silica particles. Two reactor configurations are examined: laminar flow reactors and segmented flow reactors. We analyze particle sizes and size distributions and examine their change with varying linear flow velocity and mean residence time. Laminar flow reactors are affected by axial dispersion at high linear velocities, thus leading to wide particle size distributions under these conditions. Gas is used to create a segmented flow, consisting liquid plugs separated by inert gas bubbles. The internal recirculation created in the liquid plugs generates mixing, which eliminates the axial dispersion effects associated with laminar flow reactors and produces a narrow size distribution of silica nanoparticles. This article was published in Langmuir and referenced in Journal of Bioengineering and Bioelectronics

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