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- W2074098760 abstract "We investigate the measurement of forces arising from the compression of surface-grafted poly(ethylene glycol), PEG, chains in aqueous solutions using sharp, unmodified tips in Tapping-Mode atomic force microscopy (TM-AFM). PEG chains were grafted to silica by reaction with preadsorbed poly(ethylenimine) (PEI), affording control of grafting density by reaction conditions. Numerical simulation of the cantilever oscillation, accounting for distance-dependent damping, was used to quantify the effective forces measured in TM-AFM. The decay length of the steric force was compared to those obtained using conventional AFM, and a good correlation was found between the two methods using PEG chains in both a mushroom and brush conformation. A significant disparity in the magnitude of the steric force obtained by conventional AFM force measurements and TM-AFM was observed, and this was attributed to a deeper compression/penetration of the polymer-coated surface by the tip in the case of TM-AFM." @default.
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- W2074098760 date "2006-04-13" @default.
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- W2074098760 title "A Tapping-Mode AFM Study of the Compression of Grafted Poly(ethylene glycol) Chains" @default.
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- W2074098760 doi "https://doi.org/10.1021/ma050045q" @default.
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