Switchable Wettability on Cooperative Dual-Responsive Poly-L-lysine Surface
Guo, Yi1,3; Xia, Fan2; Xu, Li3; Li, Jun1; Yang, Wensheng1; Jiang, Lei2
Source PublicationLANGMUIR
AbstractA 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 (similar to 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 superhydrophobic states. In the switching process, the hydrophobicity and hydrophilicity can be "memorized" due to the cooperative pH and temperature stimuli-induced unfolding/aggregation behaviors or PLL. This provides a new exciting prospect for understanding Surface propel-ties of polypeptides and the design of smart material surfaces with potential applications in nanodevices, bioseparation, and biosensors.
Indexed BySCI
WOS IDWOS:000273403400056
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Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang, Wensheng
Affiliation1.Jilin Univ, Coll Chem, Key Lab Surface & Interface Chem Jilin Prov, Changchun 130012, Peoples R China
2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
3.Jilin Univ, Minist Educ, Key Lab Mol Enzymol & Engn, Changchun 130021, Peoples R China
Recommended Citation
GB/T 7714
Guo, Yi,Xia, Fan,Xu, Li,et al. Switchable Wettability on Cooperative Dual-Responsive Poly-L-lysine Surface[J]. LANGMUIR,2010,26(2):1024-1028.
APA Guo, Yi,Xia, Fan,Xu, Li,Li, Jun,Yang, Wensheng,&Jiang, Lei.(2010).Switchable Wettability on Cooperative Dual-Responsive Poly-L-lysine Surface.LANGMUIR,26(2),1024-1028.
MLA Guo, Yi,et al."Switchable Wettability on Cooperative Dual-Responsive Poly-L-lysine Surface".LANGMUIR 26.2(2010):1024-1028.
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