Abstract
The viscosity of liquid is one of the important indicator in various fields. Usually, when evaluating the viscosity, it is evaluated as the representative of bulk. There was no method to evaluate the local viscosity evaluation of a specific place, such as near the wall surface or near the gas-liquid interface. In this study, we use the optical tweezers to capture micro-particles and move them in liquid. When the two forces, the trap force of the optical tweezers and the Stoke’s force on the particle are in balance, the local viscosity of the specific place can be evaluated. As a result, we were able to get experimental values that are close to literature values.
