XIONG Xiao-Min1,2,3**, CHEN Lan1, ZUO Wen-Long1, LI Long-Fei1, YANG Yue-Bin4, PANG Zhi-Yong1, ZHANG Jin-Xiu1
1School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275 2State Key Laboratory of Optoelectronic Materials and Technologies, Guangzhou 510275 3Guangdong Provincial Key Laboratory of Photovoltaics Technologies, Guangzhou 510006 4School of Information Science and Technology, Sun Yat-Sen University, Guangzhou 510006
We report a direct measurement of the imaginary part of the surface tension of water through a dynamic scheme using a thin vertical glass fiber of diameter of 3 μm with one end glued onto a cantilever beam and the other end touching a water-air interface. The frequency dependence of the dissipation factor experienced by the glass fiber is exactly calculated through measuring the phase delay with various frequencies when the glass fiber is forced to oscillate vertically. We find the same intercept at the dissipation factor axis for different frequency dependences of the dissipation factor for different depths by which the glass fiber is dipped into water. This nonzero dissipation factor at zero frequency presents direct evidence of the existence of the imaginary part of surface tension of water and yields a complex surface tension of water σ∗=0.073 + i(0.017 ± 0.002) N/m at room temperature.
. [J]. 中国物理快报, 2014, 31(07): 76801-076801.
XIONG Xiao-Min, CHEN Lan, ZUO Wen-Long, LI Long-Fei, YANG Yue-Bin, PANG Zhi-Yong, ZHANG Jin-Xiu. Imaginary Part of the Surface Tension of Water. Chin. Phys. Lett., 2014, 31(07): 76801-076801.