MEASUREMENT OF LUBRICANT OIL MICROVISCOSITY BASED ON RESONANT FREQUENCY SHIFT OF AFM CANTILEVER

Vlad – Flaviu ZEGREAN
zegrean@fim.usv.ro

Emanuel DIACONESCU


Department of Applied Mechanics, University “Stefan cel Mare” of Suceava, ROMANIA

Abstract.  Experimental investigations on microviscosity of T90 lubricant oil were conducted using an atomic force microscope. The resonant frequency of the cantilever beams was measured in air, in pure water and in sample oil. Based on the resonant frequency shift the viscosity of the lubricant was calculated using the formula deducted by Papi [1] for uncalibrated cantilevers. The results obtained are in good agreement with those of Ionescu [2], measured with a Rheotest2 rheometer, for the same lubricant.
 

Keywords:  microviscosity, atomic force microscopy, resonant frequency shift

References

1. Papi, M., Arcovito, G., De Spirito, M., Vassalli, M., Tiribilli, B., 2006, “Fluid Viscosity Determination by Means of Uncalibrated Atomic Force Microscopy Cantilevers,” Applied Physics Letters, 88, 194102.

2. Ionescu M., 2004, “A System for Viscosity Measurement in Variable Conditions of Temperature and Pressure,” MOCM 10, Vol.1, 205 – 208.

3. Binning G., Quate C.F., Gerber Ch., 1986, “Atomic Force Microscope,” Phys. Rev. Lett. 56, 930 – 933.

4. Sader, J.E., 1998, “Frequency Response of Cantilever Beams Immersed in Viscous Fluids with Applications to the Atomic Force Microscope,” Journal of Applied Physics, 84, 64 – 76.

5. Chon, J.W.M., Mulvaney, P., Sader, J.E., 2000, “Experimental Validation of Theoretical Models for the Frequency Response of Atomic Force Microscope Cantilever Beams Immersed in Fluids,” Journal of Applied Physics, 87, 3978 – 3988.

6. Chen, G.Y., Warmack, R.J., Thundat, T., Allison, D.P., Huang, A., 1994, “Resonance Response of Scanning Force Microscopy Cantilevers,” Rev. Sci. Instrum., 65(8), 2532 – 2537.

7. Oden, P.I., Chen, G.Y., Steele, R.A., Warmack, R.J., Thundat, T., 1996, “Viscous Drag Measurements Utilizing Microfabricated Cantilevers,” Applied Physics Letters, 68, 3814 – 3816.

8. Ahmed, N., Nino, D.F., Moy, V.T., 2001, “Measurement of Solution Viscosity by Atomic Force Microscopy,” Rev. Sci. Instrum., 72(6), 2731 – 2734.

9. Papi, M., Maulucci, G., Arcovito, G., Paoletti, P., Vassalli, M., De Spirito, M., 2008, “Detection of Microviscosity by Using Uncalibrated Atomic Force Microscopy Cantilevers,” Applied Physics Letters, 93, 124102.