Local measurement of liquid viscosity in optical tweezers

We present a modified method of measuring liquid viscosity in an optical tweezer system. The oscillating viscosity measurement was developed theoretically and then experimentally verified. The presented method enables quick measurement, does not require much space and the use of a camera enables other measurements, e.g. in the field of molecular biology, to be carried out in the same sample. Measurement of liquid viscosity using the presented method is possible for viscosities up to 2,5 mPa * s.

Automated summary

We propose a modified method for measuring liquid viscosity in an optical tweezer system. The method has been theoretically and experimentally validated and allows for quick measurements without occupying much space. Additionally, the use of a camera enables other measurements in the same sample, such as in the field of molecular biology. The presented method can measure liquid viscosities up to 2.5 mPa * s.