Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16905
Title: Effect of temperature and trace water on surface forces studied by liquid AFM
Authors: LIM TZE WEI, LEONARD
Keywords: Liquid AFM, Surface Forces, Temperature, Trace Water, Confined Liquids, Solvation Forces
Issue Date: 11-Aug-2008
Source: LIM TZE WEI, LEONARD (2008-08-11). Effect of temperature and trace water on surface forces studied by liquid AFM. ScholarBank@NUS Repository.
Abstract: Solvation forces in confined liquids have been studied using the Atomic Force Microscope (AFM), principally the effect of temperature, tip shape and trace amounts of water in the liquid. <br><br>The effect of temperature on solvation forces have been studied in the liquids OMCTS, n-hexadecane, and n-dodecanol. Discrete solvation layers can be observed for all three liquids at all the temperatures measured (298K to 348K). However, with increasing temperature there is a significant decrease in the magnitude of the measured solvation forces and a reduction in the number of solvation oscillations which can be observed. The normalized solvation force data, F/Rtip, has also been found to differ between AFM tips of different radius of curvature (Rtip = 15nm to 100nm) with a clear trend of decreasing F/Rtip with increasing Rtip. <br><br>The effect of trace water, with the exception of the OMCTS-HOPG system where the data is inconclusive and no comment can be made, has been found to cause a decrease in the magnitude of the maximum force (Fmax) for each layer, a decrease in the number of observable jumps, and a decrease in the exponential decay length in the liquids n-hexadecane and n-dodecanol.<br>
URI: http://scholarbank.nus.edu.sg/handle/10635/16905
Appears in Collections:Ph.D Theses (Open)

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