Single-Bond Force Measured by Means of Scanning Force Microscopy
M. Lekka, J. Gryboś, J. Lekki, Z. Stachura and J. Styczeń
Institute of Nuclear Physics, Radzikowskiego 152, 32-341 Cracow, Poland
Received: January 2, 2002; revised version April 22, 2002
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The aim of this investigation was to determine the adhesion force as a function of calcium dichloride concentration in water. The studies were performed with two surfaces carrying opposite charge in water solution: mica - as a negatively charged surface and glass covered with poly-L-lysine - as a positively charged surface, the latter due to the presence of amino groups. The surfaces were immersed in a CaCl2 solution in the range of concentration varied from 0 to 100 mM. The scanning force microscopy was applied to determine the adhesion force by measurements of the pull-off force. Additionally, the values of the single bond force were estimated basing on the Poisson distribution of the number of binding sites.
DOI: 10.12693/APhysPolA.102.355
PACS numbers: 68.35.Gy, 07.10.Pz