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• W2150916448 startingPage "11344" @default.
• W2150916448 abstract "The formation of self-assembled nanotubes is usually accounted for by anisotropic elastic properties of membranelike precursors. We present experimental data as evidence of the role played by electrostatics in the formation of self-assembled tubes in alkaline aqueous suspensions of lithocholic acid (LCA). Striking salt effects are characterized by comparing the rheological, dynamical, and scattering properties of systems prepared either in stoichiometric neutralization conditions (SC) of LCA or in a large excess of sodium hydroxide (EOC, experimentally optimized conditions) and finally, in two steps: stoichiometric neutralization followed by an appropriate addition of NaCl (AISC). The SC liquid system is originally made up of loose helical ribbons (previous transmission electron microscopy data), and upon aging they exhibit both intra- and interordering processes. Initially, the helical ribbons are loose and progressively wind around a cylinder (R = 330 Å) with their edges exposed to the solvent. They can be temporarily organized in a centered rectangular two-dimensional lattice (pgg, a = 224 Å, b = 687 Å). Upon further aging, the ribbons wind into more compact helical ribbons (or tubes with helical grooves): their edges are less-exposed and their ordering vanishes. Upon addition of NaCl salt (as in the AISC systems), the specific screening of the intra-aggregate electrostatic repulsions induces the closure of the ribbons into tubes (Rext = 260 Å, Rint = 245 Å as in the EOC systems). Simultaneously with the closure of the ribbons into plain tubes, a drastic enhancement of their interconnectivity through van der Waals attractions develops. Eventually, gels are obtained with networks having hexagonal bundles of tubes." @default.
• W2150916448 created "2016-06-24" @default.
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• W2150916448 date "2012-08-30" @default.
• W2150916448 modified "2023-10-16" @default.
• W2150916448 title "Salt Effects in the Formation of Self-Assembled Lithocholate Helical Ribbons and Tubes" @default.
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• W2150916448 doi "https://doi.org/10.1021/jp305365m" @default.
• W2150916448 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22905756" @default.
• W2150916448 hasPublicationYear "2012" @default.
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