Measurement of viscosity coefficient of liquid micro-area with laser optical tweezers

WEI Yong

doi:10.7510/jgjs.issn.1001-3806.2016.05.025

In order to realize accurate, real-time and nondestructive measurement of viscosity coefficient of sample solution, an improved method was presented based on the light-induced rotation in laser optical tweezers. Firstly, the relationship between viscosity coefficient of liquid and radius of probe particles was simulated numerically. And then, the values of rotational frequency and viscosity coefficient were measured through experimental optical tweezers. The results show that the error of viscosity coefficient is minimum when the radius of probe is 2.0m. The viscosity coefficients of pure water and ethanol solution are measured at different temperatures. Actual deviation is less than 7%, which proves the proposed method is effective. The method has the features of high accuracy and non-contact, and has obvious advantage for measurement of dilute, volatile and harmful liquid solution.

Measurement of viscosity coefficient of liquid micro-area with laser optical tweezers

1. College of Science, Yanshan University, Qinhuangdao 066004, China;

2. College of Liren, Yanshan University, Qinhuangdao 066004, China

Received Date: 2015-08-17

Accepted Date: 2015-09-21

Available Online: 2016-09-25

Abstract: In order to realize accurate, real-time and nondestructive measurement of viscosity coefficient of sample solution, an improved method was presented based on the light-induced rotation in laser optical tweezers. Firstly, the relationship between viscosity coefficient of liquid and radius of probe particles was simulated numerically. And then, the values of rotational frequency and viscosity coefficient were measured through experimental optical tweezers. The results show that the error of viscosity coefficient is minimum when the radius of probe is 2.0m. The viscosity coefficients of pure water and ethanol solution are measured at different temperatures. Actual deviation is less than 7%, which proves the proposed method is effective. The method has the features of high accuracy and non-contact, and has obvious advantage for measurement of dilute, volatile and harmful liquid solution.

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Reference (15)

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Measurement of viscosity coefficient of liquid micro-area with laser optical tweezers

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