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• W2004328019 endingPage "435603" @default.
• W2004328019 startingPage "435603" @default.
• W2004328019 abstract "Directing the self-assembly of colloidal particles into nanostructures is of great interest in nanotechnology. Here, reversible end-to-end assembly of gold nanorods (GNR) is induced by pH-dependent changes in the secondary conformation of a disulfide-modified poly(L-glutamic acid) (SSPLGA). The disulfide anchoring group drives chemisorption of the polyacid onto the end of the gold nanorods in an ethanolic solution. A layer of poly(vinyl pyrrolidone) is adsorbed on the positively charged, surfactant-stabilized GNR to screen the surfactant bilayer charge and provide stability for dispersion of the GNR in ethanol. For comparison, irreversible end-to-end assembly using a bidentate ligand, namely 1,6-hexanedithiol, is also performed. Characterization of the modified GNR and its end-to-end linking behavior using SSPLGA and hexanedithiol is performed using dynamic light scattering (DLS), UV–vis absorption spectroscopy and transmission electron microscopy (TEM). Experimental results show that, in a colloidal solution of GNR–SSPLGA at a pH∼3.5, where the PLGA is in an α-helical conformation, the modified GNR self-assemble into one-dimensional nanostructures. The linking behavior can be reversed by increasing the pH (>8.5) to drive the conformation of the polypeptide to a random coil and this reversal with pH occurs rapidly within minutes. Cycling the pH multiple times between low and high pH values can be used to drive the formation of the nanostructures of the GNR and disperse them in solution." @default.
• W2004328019 created "2016-06-24" @default.
• W2004328019 creator A5034260525 @default.
• W2004328019 creator A5038214201 @default.
• W2004328019 date "2008-09-22" @default.
• W2004328019 modified "2023-10-11" @default.
• W2004328019 title "Reversible end-to-end assembly of gold nanorods using a disulfide-modified polypeptide" @default.
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• W2004328019 doi "https://doi.org/10.1088/0957-4484/19/43/435603" @default.
• W2004328019 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21832699" @default.
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