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The nanofishing of a telechelic thiol‐terminated poly(N‐isopropylacrylamide) (PNIPAM) single polymer chain from an Au (111) substrate in aqueous solution is investigated by atomic force microscopy. The obtained force–extension curves show two typical profiles: one is in good agreement with a so‐called worm‐like chain model, whereas the other is characterized by a Rayleigh–Plateau constant force. The appearance of the force plateau region is in agreement with the theoretical predictions of a pearl‐necklace model. For the first time, the temperature‐dependent interfacial free energy is obtained between PNIPAM and water, and it is found that it is the cause of the lower‐critical‐solution‐temperature‐type phase transition seen in PNIPAM/water system.
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Liang et al. (2017) studied this question.
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