Measurement of flow velocity and inference of liquid viscosity in a microfluidic channel by fluorescence photobleaching.
نویسندگان
چکیده
We present a simple, noninvasive method for simultaneous measurement of flow velocity and inference of liquid viscosity in a microfluidic channel. We track the dynamics of a sharp front of photobleached fluorescent dye using a confocal microscope and measure the intensity at a single point downstream of the initial front position. We fit an exact solution of the advection diffusion equation to the fluorescence intensity recovery curve to determine the average flow velocity and the diffusion coefficient of the tracer dye. The dye diffusivity is correlated to solute concentration to infer rheological properties of the liquid. This technique provides a simple method for simultaneous elucidation of flow velocity and liquid viscosity in microchannels.
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ورودعنوان ژورنال:
- Langmuir : the ACS journal of surfaces and colloids
دوره 30 16 شماره
صفحات -
تاریخ انتشار 2014