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• W2085183726 abstract "A cooperative dual-responsive polypeptide surface switching between superhydrophilic and superhydrophobic states is presented. This macroscopic phenomenon of surface originates from the combination of the cooperative unfolding/aggregation of the poly-L-lysine (PLL) immobilized on the substrate with micro/nanocomposite structure in response to pH and temperature. At pH lower than the pK(a) of PLL (approximately 11.0), PLL mainly adopts a random coil conformation, which corresponds to the superhydrophilic state on the rough surface substrate. Raising the pH to higher than the pK(a) allows the appearance of alpha-helix conformation, which also corresponds to the hydrophilic state. However, heating up the surface at pH higher than the pK(a) destabilizes the alpha-helix conformation and induces the formation of aggregated beta-sheet structures, which represents the superhydrophobic state. Lowering the pH and temperature simultaneously switches a reversible conversion from superhydrophobic to superhydrophilic states. In the switching process, the hydrophobicity and hydrophilicity can be memorized due to the cooperative pH and temperature stimuli-induced unfolding/aggregation behaviors of PLL. This provides a new exciting prospect for understanding surface properties of polypeptides and the design of smart material surfaces with potential applications in nanodevices, bioseparation, and biosensors." @default.
• W2085183726 created "2016-06-24" @default.
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• W2085183726 date "2009-12-23" @default.
• W2085183726 modified "2023-10-13" @default.
• W2085183726 title "Switchable Wettability on Cooperative Dual-Responsive Poly-<scp>l</scp>-lysine Surface" @default.
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• W2085183726 doi "https://doi.org/10.1021/la9041452" @default.
• W2085183726 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20030299" @default.
• W2085183726 hasPublicationYear "2009" @default.
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