Related Experiment Videos
Detection of flowing fluorescent particles in a microcapillary using fluorescence correlation spectroscopy
Beno H Kunst1, Arjen Schots, Antonie J W G Visser
1MicroSpectroscopy Centre, Laboratory of Biochemistry, Wageningen University, The Netherlands.
Analytical Chemistry
|October 31, 2002
Summary
Fluorescence correlation spectroscopy analyzed microcapillary flow. Optical forces from laser beams were found to slow down bacteria and microspheres.
Area of Science:
- Physics
- Biophysics
- Fluid Dynamics
Background:
- Microfluidic devices are crucial for various scientific applications.
- Understanding fluid dynamics within microcapillaries is essential for precise manipulation.
- Fluorescence correlation spectroscopy (FCS) offers a powerful tool for analyzing molecular and particle dynamics.
Purpose of the Study:
- To investigate microcapillary flow dynamics using fluorescence correlation spectroscopy.
- To determine the flow velocity and profile within a microcapillary.
- To analyze the effect of optical forces on particle movement in microcapillary flow.
Main Methods:
- Utilized fluorescence correlation spectroscopy (FCS) to analyze capillary flow.
- Employed fluorescent molecules, bacteria, and microspheres as tracers.
- Determined flow velocity by fitting autocorrelation traces with diffusion and flow models.
- Analyzed fluorescence fluctuations of dye molecules to map the flow profile.
Main Results:
- Successfully determined microcapillary flow velocity and profile using FCS.
- Observed that bacteria and microspheres experience flow retardation.
- Identified optical forces generated by the laser beam as the cause of retardation.
Conclusions:
- Fluorescence correlation spectroscopy is effective for characterizing microcapillary flow.
- Optical forces significantly impact the movement of particles like bacteria and microspheres.
- This study provides insights into particle behavior in microfluidic systems under laser illumination.