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- W2507799990 abstract "There are successful protocols for dispersing carbon nanotubes and graphene oxide in physiological media by using biocompatible polymers, which enable their use in nanomedicine. However, there is not a clear understanding regarding the mechanisms of the colloidal stabilization manifested (i.e., electric, steric, electrosteric, or through depletion forces). Here we show that the manifestation of a particular mechanism of stabilization for oxidized carbon nanotubes (CNTs) and graphene oxide (GO) in the presence of Pluronic F-127 (PF127) and short- and long-chain polyethylene glycol (PEG 1500 or 35000, respectively) depends on a proper matching between the nanocarbon morphology and the polymer chain length, chemical structure, and concentration. The high aspect ratio one-dimensional morphology of CNTs enables an initial steric and electrosteric stabilization through the nanotube wrapping (i.e., adsorption) by PF127 present in low concentrations (<0.1%). Depletion stabilization for CNTs manifests when PF127 is present in high concentrations (≥1.0%), thus enabling the formation of highly stable CNT colloids even in a 0.9% NaCl saline solution. This depletion stabilization depends little on the CNT structure (i.e., single-walled or multiwalled), surface charge (i.e., ζ potential), oxidation and carboxylation degrees, or nanotube length. On the other hand, large-sized sheets of GO could be colloidally stabilized in 0.9% NaCl only in the presence of PEG 35000 through repulsive depletion forces, whose manifestation occurs with a polymer concentration threshold of 5.0 wt %. Comparatively, in a physiological saline solution, PF127 is able to colloidally stabilize CNTs to a much larger extent than PEG 35000 stabilizes the large GO sheets." @default.
- W2507799990 created "2016-09-16" @default.
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- W2507799990 date "2015-08-04" @default.
- W2507799990 modified "2023-10-01" @default.
- W2507799990 title "Mechanisms of Colloidal Stabilization of Oxidized Nanocarbons in the Presence of Polymers: Obtaining Highly Stable Colloids in Physiological Media" @default.
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- W2507799990 doi "https://doi.org/10.1021/acs.jpcc.5b04274" @default.
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