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Abstract
Static and dynamic behavior of liquid meniscus bridges has been investigated by a newly developed nanorheometer. The liquid nanomeniscus bridges are established between two borosilicale glass spheres of 20 μm in diameter and two kinds of experiment are performed: 1) The pull-off and attracting forces between two glass spheres wetted by OMCTS (Octamethylcyclotetrasiloxane) have been measured as a function of receding and approaching velocity respectively and the pull-off force has been compared with the theoretical value; 2) Normal oscillatory experiment between two glass spheres with meniscus bridge of PFPE (Perfluoropolyether) Zdol has been conducted. Results of the experiments are as follows: 1) The measured pull-off or attracting forces show almost constant values at very low receding and approaching velocities. Whereas, the measured forces deviate from the constant value at a higher velocity than 2.70 μm/s because the viscous force may begin to operate. 2) With such small substrates of 20 μm in diameter, new dynamic behavior originated from the elastic and damping effects of the liquid meniscus bridge emerges: The elastic components of the system are independent of the modulation frequency representing the characteristic of viscoelastic solid; The system is dominated by the viscous component at high frequency and the elastic component at low frequency. At high frequencies and small separations, the liquid behaves as a Newtonian fluid with a constant viscosity. On the other hand, at low frequencies and large separations, the dynamic viscosity of the system is enhanced.
Presented as a Society of Tribologists and Lubrication Engineers Paper at the ASME/STLE Tribology Conference in Seattle, Washington, October 1–4, 2000
Notes
Presented as a Society of Tribologists and Lubrication Engineers Paper at the ASME/STLE Tribology Conference in Seattle, Washington, October 1–4, 2000
