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Determination of the molar mass of surface-grafted weak polyelectrolyte brushes using force spectroscopy

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Figure

Fig. 1: Schematic diagrams showing the structure of (a) a PMMA-graft-PDMAEMA comb on a hydrophobized silicon surface and (b) a PDMAEMA brush grafted from a silicon surface
Fig. 2: Typical pulling events observed in the force curves acquired on: (a) a PDMAEMA comb layer (3.3 nm dry thickness) at pH 7 with a single peak event fitted with the worm-like chain (WLC) model (thick black solid curve), which indicates a contour lengt
Fig. 3: Molar mass of PDMAEMA comb (3.3 nm dry thickness) at pH 7 from two different techniques, the dashed grey curve represents the molar mass distribution from the GPC method and the solid black curve represents the corresponding molar mass measured by
Fig. 4: (a) Distribution of pulling distances of a PDMAEMA brush grafted from a surface with a dry thickness of 10 nm at pH 10, and a PDMAEMA comb grafted to a surface with a dry thickness of 1.9 nm at pH 7, a PDMAEMA comb grafted to a surface with a dry t
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