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- W2800535500 abstract "The adsorption–desorption behavior of polymer chains is at the heart of macromolecular surface science and technology. With the current developments in atomic force microscopy (AFM), it has now become possible to address the desorption problem from the perspective of a single macromolecule. Here, we report on desorption of single polymer chains on planar surfaces by AFM-based single molecule force spectroscopy (SMFS) as a function of the pulling angle with respect to the surface-normal direction. SMFS experiments were performed in water with various substrates using different polymers covalently attached to the AFM probe tip. End-grafting at the AFM tip was achieved by surface-initiated polymerization using initiator functionalized tips. We found that the desorption force increases with a decreasing pulling angle, i.e., an enhanced adhesion of the polymer chain was observed. The magnitude of the desorption force shows a weak angular dependence at pulling angles close to the surface normal. A significant increase of the force is observed at shallower pulling from a certain pulling angle. This behavior carries the signature of an adsorption–desorption transition. The angular dependence of the normalized desorption force exhibits a universal behavior. We compared and interpreted our results using theoretical predictions for single-chain adsorption–desorption transitions." @default.
- W2800535500 created "2018-05-17" @default.
- W2800535500 creator A5035611166 @default.
- W2800535500 creator A5049814192 @default.
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- W2800535500 date "2018-05-01" @default.
- W2800535500 modified "2023-10-18" @default.
- W2800535500 title "Angle-Dependent Atomic Force Microscopy Single-Chain Pulling of Adsorbed Macromolecules from Planar Surfaces Unveils the Signature of an Adsorption–Desorption Transition" @default.
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- W2800535500 doi "https://doi.org/10.1021/jacs.8b02851" @default.
- W2800535500 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5968430" @default.
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