Abstract
We presented an optical system that could measure the viscosity coefficient of liquid in a micro-area. The orbital rotation of a polystyrene microsphere was realized by a dual-beam fiber-optic trap with a transverse offset. The rotation rate increased with the viscosity coefficient of the environmental medium. On this basis, the viscosity coefficients of ethanol solutions with different concentrations were measured successfully. The volume of solution samples was less than 1 μL. This provides a basis for the viscosity measurement of rare liquid or enchylema, which is of great significance for biological applications such as cell characteristics and reaction dynamics.
Highlights
The viscosity coefficient of liquid, known as the dynamic viscosity, is a significant physical parameter for characterizing the resistance of fluid to shear motion
We present that the period of orbital rotation of the microspheres varied with the viscosity coefficient of liquid
We carried out the trajectory simulation and motion frequency of the microsphere trapped in the dual-beam fiber-optical trap with a transverse offset
Summary
The viscosity coefficient of liquid, known as the dynamic viscosity, is a significant physical parameter for characterizing the resistance of fluid to shear motion. It has been widely used in the industrial, biological, and medical fields. For the viscosity measurement of rare liquids or bio-fluids, it is quite important to reduce the required volume of the sample.[1,2] On a microliter scale, within liquid media, the Reynolds number is small, meaning that the forces arising from the viscosity of the fluid are dominant over its inertia. These methods are all only suitable for the measurement of the viscosity coefficient of masses of liquid, not micro-liquid or liquid in micro-areas
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