High Frequency Microrheology with Optical Tweezers

Released on by David Riegler
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  • High Frequency Microrheology with Optical Tweezers Book Detail

  • Author : David Riegler
  • Release Date : 2015
  • Publisher :
  • Genre :
  • Pages : 174
  • ISBN 13 :
  • File Size : 20,20 MB
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High Frequency Microrheology with Optical Tweezers by David Riegler PDF Summary

Book Description: This thesis presents a method to measure the linear viscoelastic response of fluids by tracking and analyzing the thermal, Brownian motion of suspended tracer particles, known as passive microrheology. The particle is confined in a harmonic optical trap and its one dimensional trajectory is obtained by a home-built split beam detection system, which works similar but responds faster than position detection with commercial quadrant photodiodes. The theory which is necessary to convert the particle trajectory into the complex shear modulus is derived in detail, pointing out that the commonly used Mason-Weitz method needs to be modified in order to obtain correct results at high frequencies due to hydrodynamic effects of the fluid. It follows a detailed explanation of the data analysis procedure which is verified for water up to angular frequencies of 107 rad/s in very good agreement with the theory. Finally, there is an outlook how to apply the method to actual complex fluids.

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Microrheology with Optical Tweezers

Microrheology with Optical Tweezers

File Size : 68,68 MB
Total View : 333 Views
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Thanks to the pioneering works of Ashkin and coworkers, optical tweezers (OTs) have become an invaluable tool for myriad studies throughout the natural sciences

Microrheology with Optical Tweezers

Microrheology with Optical Tweezers

File Size : 61,61 MB
Total View : 2892 Views
DOWNLOAD

Thanks to the pioneering works of Ashkin and coworkers, optical tweezers (OTs) have become an invaluable tool for myriad studies throughout the natural sciences