摘要
Based on a conventional torsion pendulum,we develop a forced oscillation viscometer with ultra-high viscosity sensitivity of 2×10^（-7）Pa·s working at frequencies near the resonance.The viscosity is achieved by exploiting the phase lag for the angle displacement behind the torque,instead of the resonant curve,i.e.,the variation of angle displacement amplitude versus frequency.The general formula for the measurement of the visco-elasticit.y of complex fluids is also presented.With such precision it is easy to measure tiny change in viscosity result from circumstantial influences.Deionized water and two kinds of NaCl aqueous solutions are chosen to demonstrate the performance of our home-made torsion pendulum-based viscometer.
Based on a conventional torsion pendulum,we develop a forced oscillation viscometer with ultra-high viscosity sensitivity of 2×10^（-7）Pa·s working at frequencies near the resonance.The viscosity is achieved by exploiting the phase lag for the angle displacement behind the torque,instead of the resonant curve,i.e.,the variation of angle displacement amplitude versus frequency.The general formula for the measurement of the visco-elasticit.y of complex fluids is also presented.With such precision it is easy to measure tiny change in viscosity result from circumstantial influences.Deionized water and two kinds of NaCl aqueous solutions are chosen to demonstrate the performance of our home-made torsion pendulum-based viscometer.
作者
Xiao-Guang Ma
Lan Chen
Hai-Yan Wang
Jin-Xiu Zhang
Xiao-Min Xiong
马晓光;陈岚;王海燕;张进修;熊小敏(School of PhysicsSun Yat-Sen University;Department of Physics Hong Kong University of Science and Technology;School of Information Technology Guangdong Industry Polytechnic;State Key Laboratory of Optoelectronic Materials and Technologies;Guangdong Provincial Key Laboratory of Photovoltaics Technologies)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10974259,11274391 and 11104357
the Science and Technology Planning Project of Guangdong Province under Grant No 20128060100003
the Fundamental Research Funds for the Central Universities under Grant Nos 121gpy36 and 09lgpy29
